/* roulang page: index */
:root{
  --yt-primary:#1A5FE0;
  --yt-primary-dark:#1449B4;
  --yt-primary-soft:#EAF1FE;
  --yt-accent:#FF6A2B;
  --yt-accent-dark:#E85A1C;
  --yt-accent-soft:#FFF1E9;
  --yt-teal:#0FA98F;
  --yt-ink:#101B2D;
  --yt-ink-2:#46536B;
  --yt-ink-3:#7C8AA0;
  --yt-bg:#F5F8FD;
  --yt-surface:#FFFFFF;
  --yt-line:#E4EAF3;
  --yt-card-r:16px;
  --yt-btn-r:10px;
  --yt-img-r:12px;
  --yt-pill:999px;
  --yt-sh-sm:0 1px 3px rgba(16,27,45,.05);
  --yt-sh-md:0 6px 16px rgba(16,27,45,.07);
  --yt-sh-lg:0 16px 40px rgba(16,27,45,.10);
  --yt-ease:180ms ease-out;
  --bs-primary:#1A5FE0;
  --bs-primary-rgb:26,95,224;
  --bs-body-color:#101B2D;
  --bs-body-bg:#F5F8FD;
  --bs-link-color:#1A5FE0;
  --bs-link-hover-color:#1449B4;
  --bs-border-radius:10px;
  --bs-border-color:#E4EAF3;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--yt-ink);
  background:var(--yt-bg);
  padding-bottom:84px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none;transition:color var(--yt-ease),opacity var(--yt-ease)}
a:hover{color:var(--yt-primary)}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
button,input{font-family:inherit;font-size:inherit}
:focus-visible{outline:2px solid rgba(26,95,224,.55);outline-offset:2px;border-radius:6px}
.yt-container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.yt-sec{padding:88px 0}
.yt-sec--alt{background:#fff}
.yt-sec--soft{background:var(--yt-primary-soft)}
.yt-sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.yt-sec-head--center{flex-direction:column;align-items:center;text-align:center}
.yt-eyebrow{display:inline-block;font-size:13px;letter-spacing:.08em;color:var(--yt-primary);background:var(--yt-primary-soft);border-radius:var(--yt-pill);padding:4px 12px;margin-bottom:12px;font-weight:600}
.yt-sec-title{font-size:30px;line-height:1.25;font-weight:700;letter-spacing:-.01em}
.yt-sec-sub{margin-top:12px;color:var(--yt-ink-2);font-size:16px;max-width:640px}
.yt-text-link{display:inline-flex;align-items:center;gap:6px;color:var(--yt-primary);font-weight:600;font-size:15px}
.yt-text-link span{transition:transform var(--yt-ease)}
.yt-text-link:hover{color:var(--yt-primary-dark)}
.yt-text-link:hover span{transform:translateX(3px)}

/* ===== 按钮 ===== */
.yt-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:var(--yt-btn-r);
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;
  border:1.5px solid transparent;background:#fff;color:var(--yt-ink);
  transition:all var(--yt-ease);white-space:nowrap;
}
.yt-btn--lg{height:50px;padding:0 26px;font-size:16px}
.yt-btn--accent{background:var(--yt-accent);border-color:var(--yt-accent);color:#fff;box-shadow:var(--yt-sh-sm)}
.yt-btn--accent:hover{background:var(--yt-accent-dark);border-color:var(--yt-accent-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--yt-sh-md)}
.yt-btn--accent:active{transform:translateY(0);box-shadow:var(--yt-sh-sm)}
.yt-btn--outline{background:#fff;border-color:var(--yt-primary);color:var(--yt-primary)}
.yt-btn--outline:hover{background:var(--yt-primary-soft);color:var(--yt-primary-dark);transform:translateY(-1px);box-shadow:var(--yt-sh-sm)}
.yt-btn--ghost{background:transparent;border-color:transparent;color:var(--yt-primary);font-weight:600}
.yt-btn--ghost:hover{background:var(--yt-primary-soft);color:var(--yt-primary-dark)}
.yt-btn--quiet{background:#fff;border-color:var(--yt-line);color:var(--yt-ink-2)}
.yt-btn--quiet:hover{border-color:#C9D6EA;color:var(--yt-ink);box-shadow:var(--yt-sh-sm)}
.yt-btn[disabled],.yt-btn.is-disabled{opacity:.4;pointer-events:none}
.yt-btn--full{width:100%}

/* ===== 标签 / 徽章 ===== */
.yt-tag{display:inline-block;font-size:12.5px;font-weight:600;color:var(--yt-primary);background:var(--yt-primary-soft);border-radius:var(--yt-pill);padding:3px 10px}
.yt-badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--yt-ink-2);background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-pill);padding:5px 14px;box-shadow:var(--yt-sh-sm)}
.yt-dot{width:8px;height:8px;border-radius:50%;background:var(--yt-teal);box-shadow:0 0 0 3px rgba(15,169,143,.14);display:inline-block}
.yt-chip{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;color:var(--yt-ink-2);background:rgba(255,255,255,.92);border-radius:var(--yt-pill);padding:4px 12px;box-shadow:var(--yt-sh-sm)}
.yt-chip--teal{color:#0B7C69}
.yt-chip--teal::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--yt-teal)}

/* ===== 头部导航 ===== */
.yt-header{
  position:sticky;top:0;z-index:1040;background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--yt-line);transition:box-shadow var(--yt-ease),background var(--yt-ease);
  backdrop-filter:saturate(180%) blur(8px);
}
.yt-header.is-scrolled{box-shadow:var(--yt-sh-sm);background:rgba(255,255,255,.96)}
.yt-header__inner{display:flex;align-items:center;gap:24px;height:68px}
.yt-logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.yt-logo__mark{display:inline-flex;width:28px;height:28px}
.yt-logo__text{font-size:17px;font-weight:700;letter-spacing:-.01em;color:var(--yt-ink)}
.yt-logo:hover .yt-logo__text{color:var(--yt-primary)}
.yt-nav{display:flex;align-items:center;gap:6px;margin-left:16px}
.yt-nav__link{position:relative;font-size:15px;font-weight:600;color:var(--yt-ink-2);padding:0 14px;height:68px;display:inline-flex;align-items:center;border-radius:8px;transition:color var(--yt-ease)}
.yt-nav__link::after{content:"";position:absolute;left:14px;right:14px;bottom:16px;height:2px;background:var(--yt-primary);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform var(--yt-ease)}
.yt-nav__link:hover{color:var(--yt-primary)}
.yt-nav__link:hover::after{transform:scaleX(1)}
.yt-nav__link.is-active{color:var(--yt-primary);background:var(--yt-primary-soft);height:40px;margin:14px 0;border-radius:8px}
.yt-nav__link.is-active::after{display:none}
.yt-header__right{display:flex;align-items:center;gap:12px;margin-left:auto}
.yt-search{display:flex;align-items:center;gap:8px;width:220px;height:40px;padding:0 12px;border:1px solid var(--yt-line);border-radius:var(--yt-btn-r);background:#fff;transition:all var(--yt-ease)}
.yt-search:focus-within{border-color:var(--yt-primary);box-shadow:0 0 0 3px rgba(26,95,224,.08)}
.yt-search input{border:0;outline:0;width:100%;background:transparent;font-size:14px;color:var(--yt-ink)}
.yt-search input::placeholder{color:var(--yt-ink-3)}
.yt-search svg{flex-shrink:0;color:var(--yt-ink-3)}
.yt-burger{width:42px;height:42px;border:1px solid var(--yt-line);background:#fff;border-radius:var(--yt-btn-r);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--yt-ease)}
.yt-burger:hover{border-color:#C9D6EA;box-shadow:var(--yt-sh-sm)}
.yt-drawer{width:300px}
.yt-drawer-nav{display:flex;flex-direction:column;gap:6px}
.yt-drawer-nav a{padding:12px 14px;border-radius:10px;font-weight:600;color:var(--yt-ink-2);background:#fff;border:1px solid var(--yt-line)}
.yt-drawer-nav a.is-active{color:var(--yt-primary);background:var(--yt-primary-soft);border-color:#CBDCFA}

/* ===== Hero ===== */
.yt-hero{
  position:relative;overflow:hidden;padding:76px 0 88px;background:#fff;
  background-image:radial-gradient(circle at 88% 8%,rgba(26,95,224,.08),transparent 46%);
}
.yt-hero__title{font-size:44px;line-height:1.25;font-weight:800;letter-spacing:-.02em;margin:18px 0 0}
.yt-hero__sub{font-size:20px;line-height:1.6;color:var(--yt-ink-2);margin-top:18px;max-width:560px}
.yt-hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.yt-trust{display:flex;flex-wrap:wrap;gap:0;margin-top:34px;border-top:1px solid var(--yt-line);padding-top:22px}
.yt-trust li{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--yt-ink-3);padding:0 16px;border-right:1px solid var(--yt-line)}
.yt-trust li:first-child{padding-left:0}
.yt-trust li:last-child{border-right:0}
.yt-trust svg{color:var(--yt-teal);flex-shrink:0}
.yt-hero__media{position:relative}
.yt-hero__media>img{width:100%;height:380px;object-fit:cover;border-radius:var(--yt-card-r);box-shadow:var(--yt-sh-md)}
.yt-hero__media>.yt-chip{position:absolute;top:14px;left:14px}
.yt-float-card{
  position:absolute;left:50%;bottom:-24px;transform:translateX(-50%);
  width:min(320px,88%);background:#fff;border-radius:14px;padding:18px 20px;
  box-shadow:var(--yt-sh-lg);border:1px solid var(--yt-line);
}
.yt-float-card__title{font-size:14px;font-weight:700;color:var(--yt-ink);margin-bottom:10px}
.yt-float-card li{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--yt-ink-2);padding:5px 0}
.yt-float-card li span{width:20px;height:20px;border-radius:50%;background:var(--yt-primary-soft);color:var(--yt-primary);font-size:11.5px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}

/* ===== Bento 卖点 ===== */
.yt-feature-card{background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-card-r);overflow:hidden;height:100%;display:flex;flex-direction:column;transition:all var(--yt-ease)}
.yt-feature-card:hover{box-shadow:var(--yt-sh-md);border-color:rgba(26,95,224,.22)}
.yt-feature-card__media{overflow:hidden}
.yt-feature-card__media img{width:100%;height:250px;object-fit:cover;transition:transform var(--yt-ease)}
.yt-feature-card:hover .yt-feature-card__media img{transform:scale(1.03)}
.yt-feature-card__body{padding:26px;display:flex;flex-direction:column;gap:12px;flex:1}
.yt-feature-card__body h3{font-size:20px;line-height:1.4;font-weight:700}
.yt-feature-card__body p{font-size:14.5px;color:var(--yt-ink-2);line-height:1.75}
.yt-mini-card{background:var(--yt-primary-soft);border-radius:var(--yt-card-r);padding:24px;height:100%;border:1px solid rgba(26,95,224,.10);transition:all var(--yt-ease)}
.yt-mini-card:hover{box-shadow:var(--yt-sh-md);transform:translateY(-2px)}
.yt-mini-card__icon{width:38px;height:38px;border-radius:10px;background:#fff;color:var(--yt-primary);display:inline-flex;align-items:center;justify-content:center;margin-bottom:14px;box-shadow:var(--yt-sh-sm)}
.yt-mini-card h3{font-size:18px;font-weight:700;margin-bottom:8px}
.yt-mini-card p{font-size:14px;color:var(--yt-ink-2)}
.yt-metrics{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:24px;
  background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-card-r);padding:26px 28px;box-shadow:var(--yt-sh-sm);
}
.yt-metric{text-align:left;border-right:1px solid var(--yt-line);padding-right:20px}
.yt-metric:last-child{border-right:0}
.yt-metric strong{display:block;font-size:32px;line-height:1.1;font-weight:800;color:var(--yt-primary);letter-spacing:-.02em;font-family:Inter,"PingFang SC",system-ui,sans-serif}
.yt-metric span{display:block;font-size:13px;color:var(--yt-ink-3);margin-top:6px}

/* ===== 场景演示 ===== */
.yt-scene{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:40px 0}
.yt-scene+.yt-scene{border-top:1px solid var(--yt-line)}
.yt-scene__media{position:relative;border-radius:var(--yt-card-r);overflow:hidden;box-shadow:var(--yt-sh-sm)}
.yt-scene__media img{width:100%;aspect-ratio:4/3;object-fit:cover}
.yt-scene__media .yt-chip{position:absolute;right:14px;bottom:14px}
.yt-scene__body{position:relative}
.yt-scene__num{position:absolute;top:-58px;left:-6px;font-size:88px;font-weight:800;line-height:1;color:#EDF2FA;z-index:-1;font-family:Inter,system-ui,sans-serif;letter-spacing:-.04em}
.yt-scene__body h3{font-size:22px;font-weight:700;margin-bottom:14px}
.yt-scene__body p{font-size:15px;color:var(--yt-ink-2);margin-bottom:10px}
.yt-check-list{margin:16px 0 20px;display:flex;flex-direction:column;gap:10px}
.yt-check-list li{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:var(--yt-ink-2)}
.yt-check-list svg{flex-shrink:0;margin-top:5px;color:var(--yt-teal)}
.yt-scene--reverse .yt-scene__media{order:2}
.yt-scene--reverse .yt-scene__body{order:1}

/* ===== 社会认同 ===== */
.yt-voice{background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-card-r);padding:26px;height:100%;display:flex;flex-direction:column;gap:16px;transition:all var(--yt-ease)}
.yt-voice:hover{box-shadow:var(--yt-sh-md);border-color:rgba(26,95,224,.22)}
.yt-voice__quote{font-size:34px;line-height:1;color:var(--yt-primary-soft);font-family:Georgia,serif}
.yt-voice__text{font-size:15px;color:var(--yt-ink-2);flex:1}
.yt-voice__foot{display:flex;align-items:center;gap:12px;border-top:1px solid var(--yt-line);padding-top:16px}
.yt-avatar{width:40px;height:40px;border-radius:50%;background:var(--yt-primary-soft);color:var(--yt-primary);font-weight:700;display:inline-flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0}
.yt-voice__name{font-size:14.5px;font-weight:600}
.yt-voice__role{display:inline-block;font-size:12px;color:var(--yt-ink-3);background:var(--yt-bg);border-radius:var(--yt-pill);padding:2px 10px;margin-left:8px}
.yt-markband{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:36px;padding-top:28px;border-top:1px solid var(--yt-line)}
.yt-markband span{font-size:13px;color:var(--yt-ink-3);background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-pill);padding:6px 16px}

/* ===== 分类胶囊 ===== */
.yt-pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.yt-pill{font-size:13.5px;font-weight:600;color:var(--yt-ink-2);background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-pill);padding:7px 16px;transition:all var(--yt-ease)}
.yt-pill:hover{border-color:rgba(26,95,224,.35);color:var(--yt-primary)}
.yt-pill.is-active{background:var(--yt-primary-soft);border-color:transparent;color:var(--yt-primary)}

/* ===== 内容卡片 ===== */
.yt-post-card{background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-card-r);overflow:hidden;height:100%;display:flex;flex-direction:column;transition:all var(--yt-ease)}
.yt-post-card:hover{box-shadow:var(--yt-sh-md);border-color:rgba(26,95,224,.22)}
.yt-post-card__cover{display:block;overflow:hidden}
.yt-post-card__cover img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform var(--yt-ease)}
.yt-post-card:hover .yt-post-card__cover img{transform:scale(1.03)}
.yt-post-card__body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.yt-post-card__title{font-size:18px;line-height:1.5;font-weight:700;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.yt-post-card__title a:hover{color:var(--yt-primary)}
.yt-post-card__desc{font-size:14px;color:var(--yt-ink-3);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.yt-post-card__meta{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--yt-line);padding-top:14px;font-size:13px;color:var(--yt-ink-3)}
.yt-post-card__meta a{color:var(--yt-primary);font-weight:600}
.yt-empty{
  min-height:240px;background:#fff;border:1px dashed #CBDCFA;border-radius:var(--yt-card-r);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;padding:36px;
}
.yt-empty p{color:var(--yt-ink-2);font-size:15px}
.yt-empty__icon{width:52px;height:52px;border-radius:50%;background:var(--yt-primary-soft);color:var(--yt-primary);display:inline-flex;align-items:center;justify-content:center}

/* ===== FAQ ===== */
.yt-faq{max-width:900px;margin:0 auto}
.yt-faq .accordion-item{border:0;background:#fff;border-radius:12px;box-shadow:var(--yt-sh-sm);margin-bottom:12px;overflow:hidden}
.yt-faq .accordion-button{
  font-size:17px;font-weight:600;color:var(--yt-ink);background:#fff;
  padding:20px 22px;box-shadow:none;border-radius:12px;
  display:flex;align-items:center;gap:14px;
  transition:color var(--yt-ease),background var(--yt-ease);
}
.yt-faq .accordion-button:not(.collapsed){color:var(--yt-primary);background:#fff;box-shadow:none;position:relative}
.yt-faq .accordion-button:not(.collapsed)::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:0 3px 3px 0;background:var(--yt-primary)}
.yt-faq .accordion-button:focus{box-shadow:0 0 0 3px rgba(26,95,224,.12);border-color:transparent}
.yt-faq .accordion-button::after{
  width:28px;height:28px;border-radius:50%;border:1.5px solid var(--yt-line);margin-left:auto;
  background-size:13px 13px;background-position:center;background-repeat:no-repeat;transform:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M6 1.5v9M1.5 6h9' stroke='%231A5FE0' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
}
.yt-faq .accordion-button:not(.collapsed)::after{
  transform:none;border-color:#BBD0F7;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M1.5 6h9' stroke='%231A5FE0' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
}
.yt-faq .accordion-body{padding:0 22px 22px;font-size:15px;color:var(--yt-ink-2);line-height:1.8}

/* ===== CTA 大卡 ===== */
.yt-cta-card{
  background:linear-gradient(180deg,#EAF1FE 0%,#F3F7FE 100%);
  border-radius:24px;padding:56px 40px;text-align:center;border:1px solid rgba(26,95,224,.10);
}
.yt-cta-card h2{font-size:28px;font-weight:800;line-height:1.3}
.yt-cta-card p{margin:14px auto 26px;color:var(--yt-ink-2);font-size:16px;max-width:620px}
.yt-cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ===== 页脚 ===== */
.yt-footer{background:#101B2D;color:#B9C4D6;border-top:2px solid var(--yt-primary);padding:56px 0 0;margin-top:0}
.yt-footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.yt-footer__brand{display:flex;flex-direction:column;gap:14px}
.yt-footer__logo{display:inline-flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:16px}
.yt-footer__desc{font-size:13.5px;line-height:1.8;color:#8F9CB3;max-width:300px}
.yt-footer__contact{font-size:13.5px;color:#8F9CB3}
.yt-footer h3{font-size:14px;color:#fff;font-weight:700;margin-bottom:16px;letter-spacing:.02em}
.yt-footer__links{display:flex;flex-direction:column;gap:10px}
.yt-footer__links a{font-size:13.5px;color:#B9C4D6}
.yt-footer__links a:hover{color:#fff;text-decoration:underline}
.yt-footer__bottom{
  margin-top:44px;border-top:1px solid rgba(255,255,255,.10);padding:20px 0 26px;
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;font-size:13px;color:#7C8AA0;
}
.yt-footer__bottom a{color:#7C8AA0}
.yt-footer__bottom a:hover{color:#fff}

/* ===== 底部固定转化条 ===== */
.yt-sticky-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:1050;background:#fff;
  border-top:1px solid var(--yt-line);box-shadow:var(--yt-sh-lg);
  transform:translateY(110%);opacity:0;transition:transform 240ms ease-out,opacity 240ms ease-out;
}
.yt-sticky-bar.is-visible{transform:translateY(0);opacity:1}
.yt-sticky-bar.is-faded{opacity:0}
.yt-sticky-bar.is-closed{display:none}
.yt-sticky-bar__inner{display:flex;align-items:center;justify-content:space-between;gap:18px;height:64px}
.yt-sticky-bar__text{font-size:15px;font-weight:600;color:var(--yt-ink)}
.yt-sticky-bar__actions{display:flex;align-items:center;gap:10px}
.yt-sticky-bar__close{
  width:30px;height:30px;border-radius:50%;border:1px solid var(--yt-line);background:#fff;color:var(--yt-ink-3);
  font-size:16px;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:all var(--yt-ease);
}
.yt-sticky-bar__close:hover{color:var(--yt-ink);border-color:#C9D6EA}

/* ===== 响应式 ===== */
@media (max-width:1199.98px){
  .yt-hero__title{font-size:38px}
  .yt-scene{gap:40px}
  .yt-metric strong{font-size:28px}
}
@media (max-width:991.98px){
  .yt-sec{padding:64px 0}
  .yt-nav,.yt-search{display:none}
  .yt-hero{padding:52px 0 72px}
  .yt-hero__title{font-size:32px}
  .yt-hero__sub{font-size:18px}
  .yt-hero__media{margin-top:20px}
  .yt-scene{grid-template-columns:1fr;gap:26px;padding:32px 0}
  .yt-scene__num{position:static;display:block;font-size:56px;color:#E3EBF8;margin-bottom:6px}
  .yt-scene--reverse .yt-scene__media{order:1}
  .yt-scene--reverse .yt-scene__body{order:2}
  .yt-metrics{grid-template-columns:repeat(2,1fr);gap:18px;padding:22px}
  .yt-metric{border-right:0;padding-right:0}
  .yt-footer__grid{grid-template-columns:1fr 1fr;gap:32px}
  .yt-cta-card{padding:40px 24px}
  .yt-cta-card h2{font-size:24px}
  .yt-sec-title{font-size:24px}
}
@media (max-width:767.98px){
  body{padding-bottom:72px}
  .yt-header__inner{height:62px;gap:12px}
  .yt-logo__text{font-size:15px;max-width:170px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .yt-hero__title{font-size:28px}
  .yt-hero__media>img{height:260px}
  .yt-float-card{position:static;transform:none;width:100%;margin-top:16px}
  .yt-trust{border-top:0;padding-top:0}
  .yt-trust li{padding:6px 14px 6px 0;border-right:0;width:50%}
  .yt-pill-row{overflow-x:auto;flex-wrap:nowrap;padding-bottom:6px}
  .yt-pill{white-space:nowrap}
  .yt-sticky-bar__inner{height:56px;gap:10px}
  .yt-sticky-bar__text{display:none}
  .yt-sticky-bar__actions{width:100%}
  .yt-sticky-bar__actions .yt-btn{flex:1}
  .yt-footer__grid{grid-template-columns:1fr;gap:28px}
  .yt-footer__bottom{justify-content:flex-start;flex-direction:column;align-items:flex-start}
  .yt-faq .accordion-button{font-size:15.5px;padding:16px 18px}
  .yt-faq .accordion-body{padding:0 18px 18px;font-size:14.5px}
}
@media (max-width:419.98px){
  .yt-hero__cta .yt-btn{width:100%}
  .yt-cta-actions .yt-btn{width:100%}
  .yt-trust li{width:100%}
}

/* roulang page: article */
:root{
  --yt-primary:#1A5FE0;
  --yt-primary-dark:#1449B4;
  --yt-primary-soft:#EAF1FE;
  --yt-accent:#FF6A2B;
  --yt-accent-soft:#FFF1E9;
  --yt-teal:#0FA98F;
  --yt-ink:#101B2D;
  --yt-ink-2:#46536B;
  --yt-ink-3:#7C8AA0;
  --yt-bg:#F5F8FD;
  --yt-card:#FFFFFF;
  --yt-line:#E4EAF3;
  --yt-r-card:16px;
  --yt-r-btn:10px;
  --yt-r-img:12px;
  --yt-sh-sm:0 1px 3px rgba(16,27,45,.05);
  --yt-sh-md:0 6px 16px rgba(16,27,45,.07);
  --yt-sh-lg:0 16px 40px rgba(16,27,45,.10);
  --yt-ease:180ms ease-out;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--yt-ink);
  background:var(--yt-bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:var(--yt-primary);text-decoration:none;transition:color var(--yt-ease)}
a:hover{color:var(--yt-primary-dark)}
button,input{font-family:inherit;font-size:inherit}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding-left:0;list-style:none}
::selection{background:rgba(26,95,224,.16)}
.yt-container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.yt-num{font-family:Inter,"Segoe UI",system-ui,sans-serif;font-variant-numeric:tabular-nums}

/* ---------- 按钮体系 ---------- */
.yt-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--yt-r-btn);
  font-size:15px;font-weight:600;line-height:1;letter-spacing:.2px;
  border:1.5px solid transparent;cursor:pointer;white-space:nowrap;
  transition:background-color var(--yt-ease),color var(--yt-ease),border-color var(--yt-ease),box-shadow var(--yt-ease),transform var(--yt-ease);
}
.yt-btn:focus-visible{outline:2px solid var(--yt-primary);outline-offset:2px}
.yt-btn--accent{background:var(--yt-accent);color:#fff;box-shadow:0 4px 12px rgba(255,106,43,.22)}
.yt-btn--accent:hover{background:#F0561A;color:#fff;transform:translateY(-1px);box-shadow:0 10px 22px rgba(255,106,43,.28)}
.yt-btn--accent:active{transform:translateY(0);box-shadow:0 3px 8px rgba(255,106,43,.24)}
.yt-btn--ghost{background:#fff;color:var(--yt-primary);border-color:var(--yt-primary)}
.yt-btn--ghost:hover{background:var(--yt-primary-soft);color:var(--yt-primary-dark);transform:translateY(-1px);box-shadow:var(--yt-sh-sm)}
.yt-btn--soft{background:var(--yt-primary-soft);color:var(--yt-primary-dark);border-color:#D6E3FB}
.yt-btn--soft:hover{background:#DFEAFD;color:var(--yt-primary-dark);transform:translateY(-1px)}
.yt-btn--sm{height:40px;padding:0 18px;font-size:14px}
.yt-btn[disabled]{opacity:.4;pointer-events:none}

/* ---------- 顶部导航 ---------- */
.yt-header{
  position:sticky;top:0;z-index:1030;background:#fff;
  border-bottom:1px solid var(--yt-line);
  transition:box-shadow var(--yt-ease),background-color var(--yt-ease);
}
.yt-header.is-scrolled{box-shadow:var(--yt-sh-sm);background:rgba(255,255,255,.96);backdrop-filter:saturate(180%) blur(10px)}
.yt-header__inner{display:flex;align-items:center;gap:20px;height:68px}
.yt-logo{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--yt-ink);white-space:nowrap;letter-spacing:.2px}
.yt-logo:hover{color:var(--yt-primary)}
.yt-logo svg{display:block;flex:none}
.yt-nav{display:flex;align-items:center;gap:2px;margin-left:6px}
.yt-nav__link{
  position:relative;display:inline-flex;align-items:center;height:34px;padding:0 14px;
  border-radius:999px;font-size:15px;color:var(--yt-ink-2);transition:color var(--yt-ease),background-color var(--yt-ease);
}
.yt-nav__link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:1px;height:2px;border-radius:2px;
  background:var(--yt-primary);transform:scaleX(0);transform-origin:left;transition:transform var(--yt-ease);
}
.yt-nav__link:hover{color:var(--yt-primary)}
.yt-nav__link:hover::after{transform:scaleX(1)}
.yt-nav__link.is-active{color:var(--yt-primary);background:var(--yt-primary-soft);font-weight:600}
.yt-nav__link.is-active::after{transform:scaleX(0)}
.yt-header__actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.yt-search{position:relative;display:flex;align-items:center;width:220px}
.yt-search svg{position:absolute;left:12px;color:var(--yt-ink-3);pointer-events:none}
.yt-search input{
  width:100%;height:40px;padding:0 14px 0 36px;border:1px solid var(--yt-line);border-radius:10px;
  background:#fff;color:var(--yt-ink);font-size:14px;
  transition:border-color var(--yt-ease),box-shadow var(--yt-ease);
}
.yt-search input::placeholder{color:var(--yt-ink-3)}
.yt-search input:focus{outline:none;border-color:var(--yt-primary);box-shadow:0 0 0 3px rgba(26,95,224,.12)}
.yt-login{display:inline-flex;align-items:center;gap:6px;height:40px;padding:0 6px;font-size:15px;font-weight:500;color:var(--yt-primary)}
.yt-login:hover{color:var(--yt-primary-dark)}
.yt-icon-btn{
  display:none;width:40px;height:40px;align-items:center;justify-content:center;
  border:1px solid var(--yt-line);border-radius:10px;background:#fff;color:var(--yt-ink-2);
  transition:border-color var(--yt-ease),color var(--yt-ease),box-shadow var(--yt-ease);
}
.yt-icon-btn:hover{border-color:rgba(26,95,224,.4);color:var(--yt-primary);box-shadow:var(--yt-sh-sm)}
.yt-burger{display:none}

/* ---------- 抽屉 ---------- */
.yt-drawer{background:#fff;color:var(--yt-ink);width:320px !important}
.yt-drawer .offcanvas-header{border-bottom:1px solid var(--yt-line);padding:16px 20px}
.yt-drawer .offcanvas-body{padding:20px}
.yt-drawer__brand{display:inline-flex;align-items:center;gap:10px;font-size:16px;font-weight:700;color:var(--yt-ink)}
.yt-drawer__close{
  width:36px;height:36px;border-radius:10px;border:1px solid var(--yt-line);background:#fff;color:var(--yt-ink-2);
  display:inline-flex;align-items:center;justify-content:center;transition:all var(--yt-ease);
}
.yt-drawer__close:hover{border-color:rgba(26,95,224,.4);color:var(--yt-primary)}
.yt-drawer__links{display:flex;flex-direction:column;gap:10px;margin-bottom:22px}
.yt-drawer__links a{
  display:block;padding:13px 16px;border:1px solid var(--yt-line);border-radius:12px;
  font-size:15px;color:var(--yt-ink-2);background:#fff;transition:all var(--yt-ease);
}
.yt-drawer__links a:hover{border-color:rgba(26,95,224,.35);color:var(--yt-primary)}
.yt-drawer__links a.is-active{background:var(--yt-primary-soft);border-color:#D6E3FB;color:var(--yt-primary);font-weight:600}
.yt-drawer__search svg{position:absolute;left:12px;color:var(--yt-ink-3)}
.yt-drawer__search{position:relative;display:flex;align-items:center;margin-bottom:16px}
.yt-drawer__search input{
  width:100%;height:44px;padding:0 14px 0 38px;border:1px solid var(--yt-line);border-radius:10px;
  background:#fff;font-size:14px;color:var(--yt-ink);
}
.yt-drawer__search input:focus{outline:none;border-color:var(--yt-primary);box-shadow:0 0 0 3px rgba(26,95,224,.12)}
.yt-drawer__cta{display:flex;flex-direction:column;gap:12px}

/* ---------- 文章头部 ---------- */
.yt-page-head{position:relative;padding:36px 0 0;overflow:hidden}
.yt-page-head::before{
  content:"";position:absolute;right:-100px;top:-120px;width:460px;height:460px;border-radius:50%;
  background:radial-gradient(circle,rgba(26,95,224,.09),rgba(26,95,224,0) 70%);pointer-events:none;
}
.yt-page-head > *{position:relative}
.yt-breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12.5px;color:var(--yt-ink-3);margin-bottom:18px}
.yt-breadcrumb a{color:var(--yt-ink-3)}
.yt-breadcrumb a:hover{color:var(--yt-primary)}
.yt-breadcrumb .yt-sep{color:#C6D0DE}
.yt-article__title{
  font-size:clamp(24px,3.2vw,32px);line-height:1.35;font-weight:700;color:var(--yt-ink);
  letter-spacing:.2px;max-width:900px;
}
.yt-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:16px;font-size:14px;color:var(--yt-ink-3)}
.yt-chip-cat{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:999px;
  background:var(--yt-primary-soft);color:var(--yt-primary);font-size:13px;font-weight:600;
}
.yt-meta__dot{color:#C6D0DE}
.yt-rule{height:1px;background:var(--yt-line);margin:26px 0 0}
.yt-cover{margin-top:26px}
.yt-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--yt-r-card);background:var(--yt-primary-soft)}
.yt-cover__cap{font-size:13px;color:var(--yt-ink-3);text-align:center;margin-top:10px}

/* ---------- 主体布局 ---------- */
.yt-layout{
  display:grid;grid-template-columns:minmax(0,760px) 300px;gap:40px;
  justify-content:center;align-items:start;padding:44px 0 0;
}
.yt-article__body{font-size:17px;line-height:1.85;color:var(--yt-ink-2)}
.yt-article__body > * + *{margin-top:1.3em}
.yt-article__body h2{
  position:relative;font-size:22px;line-height:1.4;font-weight:700;color:var(--yt-ink);
  padding-left:14px;margin:40px 0 16px;scroll-margin-top:96px;
}
.yt-article__body h2::before{
  content:"";position:absolute;left:0;top:5px;bottom:5px;width:4px;border-radius:2px;background:var(--yt-primary);
}
.yt-article__body h3{font-size:19px;line-height:1.5;font-weight:600;color:var(--yt-ink);margin:32px 0 12px;scroll-margin-top:96px}
.yt-article__body h4{font-size:17px;font-weight:600;color:var(--yt-ink);margin:24px 0 10px}
.yt-article__body p{margin:0}
.yt-article__body ul{padding-left:20px}
.yt-article__body ul li{position:relative;margin:8px 0}
.yt-article__body ul li::before{
  content:"";position:absolute;left:-16px;top:.78em;width:6px;height:6px;border-radius:50%;background:var(--yt-primary);
}
.yt-article__body ol{list-style:decimal;padding-left:22px}
.yt-article__body ol li{margin:8px 0}
.yt-article__body ol li::marker{color:var(--yt-primary);font-weight:600}
.yt-article__body blockquote{
  margin:1.3em 0;padding:16px 20px;background:var(--yt-primary-soft);
  border-left:3px solid var(--yt-primary);border-radius:8px;color:var(--yt-ink-2);font-size:16px;
}
.yt-article__body blockquote p{margin:0}
.yt-article__body img{border-radius:var(--yt-r-img);margin:24px auto;height:auto}
.yt-article__body a{color:var(--yt-primary);border-bottom:1px solid rgba(26,95,224,.32)}
.yt-article__body a:hover{color:var(--yt-primary-dark);border-bottom-color:var(--yt-primary-dark)}
.yt-article__body strong{color:var(--yt-ink);font-weight:600}
.yt-article__body hr{border:none;height:1px;background:var(--yt-line);margin:32px 0}
.yt-article__body code{
  background:#F1F4F9;border-radius:6px;padding:2px 6px;font-size:14px;color:var(--yt-primary-dark);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
.yt-article__body pre{
  background:#0F1B2D;color:#E7EEF8;border-radius:12px;padding:18px 20px;overflow-x:auto;font-size:14px;line-height:1.7;
}
.yt-article__body pre code{background:none;color:inherit;padding:0}
.yt-article__body table{
  width:100%;border-collapse:separate;border-spacing:0;font-size:15px;background:#fff;
  border:1px solid var(--yt-line);border-radius:12px;overflow:hidden;
}
.yt-article__body th{background:var(--yt-primary-soft);color:var(--yt-primary-dark);font-weight:600;text-align:left;padding:14px 18px}
.yt-article__body td{padding:14px 18px;border-top:1px solid var(--yt-line);color:var(--yt-ink-2)}
.yt-article__body tbody tr:nth-child(even) td{background:#F8FAFE}

/* 空态 */
.yt-empty{
  background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-r-card);
  box-shadow:var(--yt-sh-sm);padding:48px 28px;text-align:center;
}
.yt-empty__icon{
  width:56px;height:56px;margin:0 auto 18px;border-radius:16px;background:var(--yt-primary-soft);
  display:flex;align-items:center;justify-content:center;color:var(--yt-primary);
}
.yt-empty h2{font-size:20px;font-weight:700;color:var(--yt-ink);margin-bottom:10px}
.yt-empty p{font-size:15px;color:var(--yt-ink-3);margin-bottom:22px}

/* ---------- 标签与操作行 ---------- */
.yt-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:40px}
.yt-tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;border-radius:999px;
  background:#fff;border:1px solid var(--yt-line);font-size:13px;color:var(--yt-ink-2);
  transition:all var(--yt-ease);
}
.yt-tag:hover{border-color:rgba(26,95,224,.35);color:var(--yt-primary);background:var(--yt-primary-soft)}
.yt-actions{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;
  margin-top:26px;padding-top:22px;border-top:1px solid var(--yt-line);
}
.yt-actions__link{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--yt-ink-3)}
.yt-actions__link:hover{color:var(--yt-primary)}
.yt-share{margin-left:auto;display:inline-flex;align-items:center;gap:10px;font-size:13px;color:var(--yt-ink-3)}
.yt-share a{
  width:32px;height:32px;border-radius:50%;border:1px solid var(--yt-line);background:#fff;
  display:inline-flex;align-items:center;justify-content:center;color:var(--yt-ink-3);
  transition:all var(--yt-ease);
}
.yt-share a:hover{border-color:rgba(26,95,224,.4);color:var(--yt-primary);background:var(--yt-primary-soft);transform:translateY(-1px)}

/* ---------- 侧栏 ---------- */
.yt-side{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.yt-side__card{background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-r-card);padding:20px;box-shadow:var(--yt-sh-sm)}
.yt-side__title{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:700;color:var(--yt-ink);margin-bottom:14px}
.yt-side__title svg{color:var(--yt-primary);flex:none}
.yt-toc{display:flex;flex-direction:column}
.yt-toc a{
  display:block;font-size:14px;line-height:1.6;color:var(--yt-ink-2);
  padding:8px 10px 8px 12px;border-left:2px solid var(--yt-line);
  transition:all var(--yt-ease);
}
.yt-toc a:hover{color:var(--yt-primary);border-left-color:var(--yt-primary);background:#F8FAFE}
.yt-toc a.is-current{color:var(--yt-primary);font-weight:600;border-left-color:var(--yt-primary);background:var(--yt-primary-soft)}
.yt-hot{display:flex;flex-direction:column;gap:12px}
.yt-hot li{display:flex;gap:10px;align-items:flex-start}
.yt-hot__no{flex:none;width:22px;font-size:13px;font-weight:700;color:var(--yt-primary);line-height:1.7}
.yt-hot a{font-size:14px;line-height:1.65;color:var(--yt-ink-2)}
.yt-hot a:hover{color:var(--yt-primary)}
.yt-side__cta{background:var(--yt-primary-soft);border:1px solid #D6E3FB;border-radius:var(--yt-r-card);padding:22px}
.yt-side__cta h3{font-size:16px;font-weight:700;color:var(--yt-ink);margin-bottom:8px}
.yt-side__cta p{font-size:13.5px;line-height:1.7;color:var(--yt-ink-2);margin-bottom:16px}
.yt-side__cta .yt-btn{width:100%}

/* ---------- 相关推荐 ---------- */
.yt-section{padding-top:72px}
.yt-section__head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:24px}
.yt-section__title{font-size:24px;font-weight:700;color:var(--yt-ink);letter-spacing:.2px}
.yt-section__more{display:inline-flex;align-items:center;gap:4px;font-size:14px;color:var(--yt-primary);font-weight:600}
.yt-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.yt-card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--yt-line);
  border-radius:var(--yt-r-card);overflow:hidden;
  transition:box-shadow var(--yt-ease),border-color var(--yt-ease),transform var(--yt-ease);
}
.yt-card:hover{box-shadow:var(--yt-sh-md);border-color:rgba(26,95,224,.22);transform:translateY(-2px)}
.yt-card__media{aspect-ratio:16/9;background:var(--yt-primary-soft);overflow:hidden}
.yt-card__media img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease-out}
.yt-card:hover .yt-card__media img{transform:scale(1.03)}
.yt-card__body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.yt-card__tag{
  align-self:flex-start;display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  background:var(--yt-primary-soft);color:var(--yt-primary);font-size:12.5px;font-weight:600;
}
.yt-card__title{
  font-size:18px;line-height:1.45;font-weight:700;color:var(--yt-ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.yt-card__title a{color:inherit}
.yt-card__title a:hover{color:var(--yt-primary)}
.yt-card__desc{
  font-size:14px;line-height:1.7;color:var(--yt-ink-3);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.yt-card__foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--yt-ink-3)}
.yt-card__more{display:inline-flex;align-items:center;gap:4px;color:var(--yt-primary);font-weight:600;font-size:13px}

/* ---------- 底部 CTA ---------- */
.yt-cta-band{
  margin:76px 0 88px;padding:44px 40px;border-radius:20px;background:var(--yt-primary-soft);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;
}
.yt-cta-band h2{font-size:24px;font-weight:700;color:var(--yt-ink);margin-bottom:8px}
.yt-cta-band p{font-size:15px;color:var(--yt-ink-2)}
.yt-cta-band__actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 页脚 ---------- */
.yt-footer{background:#101B2D;color:#B9C4D6;border-top:2px solid var(--yt-primary);padding-top:56px}
.yt-footer__grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px}
.yt-footer h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.yt-footer__logo{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:#fff;margin-bottom:14px}
.yt-footer__logo:hover{color:#fff}
.yt-footer__desc{font-size:14px;line-height:1.75;color:#93A1B7;margin-bottom:10px;max-width:330px}
.yt-footer__contact{font-size:13px;color:#7C8AA0}
.yt-footer__links{display:flex;flex-direction:column;gap:10px}
.yt-footer__links a{font-size:14px;color:#B9C4D6}
.yt-footer__links a:hover{color:#fff;text-decoration:underline}
.yt-footer__bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  padding:20px 0 28px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;color:#7C8AA0;
}
.yt-footer__bottom a{color:#B9C4D6}
.yt-footer__bottom a:hover{color:#fff}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .yt-layout{grid-template-columns:minmax(0,1fr);gap:32px;padding-top:36px}
  .yt-side{position:static;order:2}
}
@media (max-width:1023px){
  .yt-cards{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:991px){
  .yt-nav{display:none}
  .yt-search{display:none}
  .yt-login{display:none}
  .yt-burger{display:inline-flex}
  .yt-header__actions{gap:10px}
  .yt-footer__grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:767px){
  .yt-page-head{padding-top:26px}
  .yt-rule{margin-top:20px}
  .yt-layout{padding-top:30px;gap:28px}
  .yt-article__body{font-size:16px}
  .yt-article__body h2{font-size:20px}
  .yt-article__body h3{font-size:18px}
  .yt-cards{grid-template-columns:1fr}
  .yt-section{padding-top:56px}
  .yt-cta-band{margin:56px 0 64px;padding:30px 22px;border-radius:16px}
  .yt-cta-band h2{font-size:20px}
  .yt-cta-band__actions{width:100%}
  .yt-footer{padding-top:44px}
  .yt-footer__grid{grid-template-columns:1fr;gap:26px;padding-bottom:32px}
}
@media (max-width:420px){
  .yt-btn{width:100%}
  .yt-header .yt-btn{width:auto}
  .yt-share{margin-left:0;width:100%}
}

/* roulang page: category1 */
:root{
  --yt-primary:#1A5FE0;
  --yt-primary-dark:#1449B4;
  --yt-primary-light:#EAF1FE;
  --yt-accent:#FF6A2B;
  --yt-accent-light:#FFF1E9;
  --yt-teal:#0FA98F;
  --yt-ink:#101B2D;
  --yt-ink-2:#46536B;
  --yt-ink-3:#7C8AA0;
  --yt-bg:#F5F8FD;
  --yt-surface:#FFFFFF;
  --yt-line:#E4EAF3;
  --yt-radius-card:16px;
  --yt-radius-btn:10px;
  --yt-radius-img:12px;
  --yt-shadow-sm:0 1px 3px rgba(16,27,45,.05);
  --yt-shadow-md:0 6px 16px rgba(16,27,45,.07);
  --yt-shadow-lg:0 16px 40px rgba(16,27,45,.10);
  --yt-ease:180ms ease-out;
  --bs-primary:#1A5FE0;
  --bs-primary-rgb:26,95,224;
  --bs-body-color:#101B2D;
  --bs-body-bg:#FFFFFF;
  --bs-border-color:#E4EAF3;
  --bs-font-sans-serif:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bs-body-font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bs-border-radius:10px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--yt-ink);
  background:var(--yt-bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--yt-primary);text-decoration:none;transition:color var(--yt-ease),opacity var(--yt-ease)}
a:hover{color:var(--yt-primary-dark)}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;color:var(--yt-ink);letter-spacing:-.01em}
p{margin:0}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--yt-primary);outline-offset:2px;border-radius:6px}

/* 容器 */
.yt-container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ============ 头部导航 ============ */
.yt-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--yt-line);
  backdrop-filter:saturate(180%) blur(10px);
  transition:box-shadow var(--yt-ease),background var(--yt-ease);
}
.yt-header.is-scrolled{box-shadow:var(--yt-shadow-sm)}
.yt-header__inner{display:flex;align-items:center;gap:20px;height:68px}
.yt-logo{
  display:flex;align-items:center;gap:10px;
  font-size:17px;font-weight:700;color:var(--yt-ink);
  flex-shrink:0;white-space:nowrap;
}
.yt-logo:hover{color:var(--yt-primary)}
.yt-logo svg{flex-shrink:0}
.yt-nav{display:flex;align-items:center;gap:4px;margin:0 auto}
.yt-nav__link{
  position:relative;
  display:inline-block;
  padding:9px 15px;
  font-size:15px;font-weight:500;color:var(--yt-ink-2);
  border-radius:999px;
  transition:color var(--yt-ease),background var(--yt-ease);
}
.yt-nav__link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:3px;height:2px;
  background:var(--yt-primary);border-radius:2px;
  transform:scaleX(0);transform-origin:center;
  transition:transform var(--yt-ease);
}
.yt-nav__link:hover{color:var(--yt-primary)}
.yt-nav__link:hover::after{transform:scaleX(1)}
.yt-nav__link.is-active{color:var(--yt-primary);background:var(--yt-primary-light)}
.yt-nav__link.is-active::after{opacity:0}
.yt-header__actions{display:flex;align-items:center;gap:12px;flex-shrink:0}
.yt-search{position:relative}
.yt-search input{
  width:220px;height:40px;
  padding:0 14px 0 38px;
  font-size:14px;color:var(--yt-ink);
  background:#F8FAFE;
  border:1px solid var(--yt-line);
  border-radius:var(--yt-radius-btn);
  transition:border-color var(--yt-ease),box-shadow var(--yt-ease),background var(--yt-ease);
}
.yt-search input::placeholder{color:var(--yt-ink-3)}
.yt-search input:focus{
  outline:none;background:#fff;
  border-color:var(--yt-primary);
  box-shadow:0 0 0 4px rgba(26,95,224,.10);
}
.yt-search__icon{
  position:absolute;left:13px;top:50%;transform:translateY(-50%);
  color:var(--yt-ink-3);display:flex;pointer-events:none;
}
.yt-burger{
  display:none;width:40px;height:40px;align-items:center;justify-content:center;
  background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-radius-btn);
  color:var(--yt-ink-2);cursor:pointer;transition:border-color var(--yt-ease),color var(--yt-ease);
}
.yt-burger:hover{border-color:var(--yt-primary);color:var(--yt-primary)}

/* ============ 按钮 ============ */
.yt-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 20px;
  font-size:15px;font-weight:600;line-height:1;
  border-radius:var(--yt-radius-btn);
  border:1.5px solid transparent;
  cursor:pointer;white-space:nowrap;
  transition:background var(--yt-ease),color var(--yt-ease),border-color var(--yt-ease),box-shadow var(--yt-ease),transform var(--yt-ease);
}
.yt-btn--accent{background:var(--yt-accent);color:#fff;box-shadow:var(--yt-shadow-sm)}
.yt-btn--accent:hover{background:#F25C1E;color:#fff;transform:translateY(-1px);box-shadow:var(--yt-shadow-md)}
.yt-btn--accent:active{transform:translateY(0)}
.yt-btn--outline{background:#fff;color:var(--yt-primary);border-color:var(--yt-primary)}
.yt-btn--outline:hover{background:var(--yt-primary-light);color:var(--yt-primary-dark);border-color:var(--yt-primary-dark);transform:translateY(-1px);box-shadow:var(--yt-shadow-sm)}
.yt-btn--ghost{background:transparent;color:var(--yt-primary);padding:0 10px}
.yt-btn--ghost:hover{color:var(--yt-primary-dark);background:var(--yt-primary-light)}
.yt-btn--lg{height:48px;padding:0 26px;font-size:16px}
.yt-btn--block{width:100%}
.yt-btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.yt-btn--text{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--yt-primary)}
.yt-btn--text:hover{gap:10px;color:var(--yt-primary-dark)}

/* ============ 移动端抽屉 ============ */
.yt-drawer{
  position:fixed;top:0;right:0;bottom:0;width:300px;max-width:86vw;
  background:#fff;z-index:1060;
  box-shadow:var(--yt-shadow-lg);
  transform:translateX(102%);
  transition:transform 240ms ease-out;
  display:flex;flex-direction:column;padding:20px;
  overflow-y:auto;
}
.yt-drawer.is-open{transform:translateX(0)}
.yt-drawer__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.yt-drawer__head span{font-weight:700;font-size:16px}
.yt-drawer__close{
  width:36px;height:36px;border-radius:10px;border:1px solid var(--yt-line);background:#fff;
  font-size:20px;line-height:1;color:var(--yt-ink-2);cursor:pointer;
}
.yt-drawer__nav{display:flex;flex-direction:column;gap:6px;margin-bottom:20px}
.yt-drawer__nav a{
  padding:12px 14px;border-radius:10px;font-size:15px;font-weight:500;
  color:var(--yt-ink-2);background:#F8FAFE;
}
.yt-drawer__nav a.is-active{color:var(--yt-primary);background:var(--yt-primary-light);font-weight:600}
.yt-drawer__nav a:hover{color:var(--yt-primary)}
.yt-drawer-backdrop{
  position:fixed;inset:0;background:rgba(16,27,45,.42);z-index:1050;opacity:0;
  transition:opacity 240ms ease-out;
}
.yt-drawer-backdrop.is-open{opacity:1}

/* ============ 面包屑 ============ */
.yt-crumb{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:12.5px;color:var(--yt-ink-3);
}
.yt-crumb a{color:var(--yt-ink-3)}
.yt-crumb a:hover{color:var(--yt-primary)}
.yt-crumb span[aria-hidden]{color:#C3CDDD}

/* ============ 分类页 Hero ============ */
.yt-cat-hero{
  position:relative;
  padding:44px 0 52px;
  min-height:280px;
  background:
    linear-gradient(180deg,rgba(234,241,254,.94) 0%,rgba(245,248,253,.92) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom:1px solid var(--yt-line);
  overflow:hidden;
}
.yt-cat-hero::after{
  content:"";position:absolute;right:-120px;top:-120px;width:380px;height:380px;border-radius:50%;
  background:radial-gradient(circle,rgba(26,95,224,.12),rgba(26,95,224,0) 68%);
  pointer-events:none;
}
.yt-cat-hero__inner{position:relative;z-index:1;display:flex;flex-direction:column;gap:16px}
.yt-cat-hero h1{font-size:40px;max-width:820px}
.yt-cat-hero__desc{
  font-size:17px;color:var(--yt-ink-2);max-width:720px;
}
.yt-cat-hero__tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px}
.yt-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 14px;border-radius:999px;
  font-size:13px;font-weight:500;
  background:#fff;color:var(--yt-ink-2);
  border:1px solid var(--yt-line);
  box-shadow:var(--yt-shadow-sm);
}
.yt-chip i{width:7px;height:7px;border-radius:50%;background:var(--yt-teal);display:inline-block}
.yt-chip--accent i{background:var(--yt-accent)}
.yt-chip--primary i{background:var(--yt-primary)}

/* ============ 速览条 ============ */
.yt-quick{
  margin-top:-34px;position:relative;z-index:2;
}
.yt-quick__grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
  background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-radius-card);
  box-shadow:var(--yt-shadow-md);padding:24px;
}
.yt-quick__item{display:flex;gap:14px;align-items:flex-start}
.yt-quick__icon{
  width:40px;height:40px;flex-shrink:0;border-radius:12px;
  background:var(--yt-primary-light);color:var(--yt-primary);
  display:flex;align-items:center;justify-content:center;
}
.yt-quick__item h3{font-size:16px;margin-bottom:4px}
.yt-quick__item p{font-size:13.5px;color:var(--yt-ink-3);line-height:1.65}

/* ============ 主体两栏 ============ */
.yt-section{padding:72px 0}
.yt-layout{display:grid;grid-template-columns:240px 1fr;gap:48px;align-items:start}
.yt-anchor{
  position:sticky;top:96px;
  background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-radius-card);
  padding:18px;box-shadow:var(--yt-shadow-sm);
}
.yt-anchor__title{
  font-size:12.5px;font-weight:600;color:var(--yt-ink-3);
  letter-spacing:.06em;margin-bottom:12px;
}
.yt-anchor__link{
  position:relative;display:block;
  padding:10px 12px 10px 16px;
  font-size:14.5px;font-weight:500;color:var(--yt-ink-2);
  border-radius:10px;
  transition:color var(--yt-ease),background var(--yt-ease);
}
.yt-anchor__link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:3px;height:20px;border-radius:0 3px 3px 0;background:var(--yt-primary);
  transition:transform var(--yt-ease);
}
.yt-anchor__link:hover{color:var(--yt-primary);background:var(--yt-primary-light)}
.yt-anchor__link.is-active{color:var(--yt-primary);background:var(--yt-primary-light);font-weight:600}
.yt-anchor__link.is-active::before{transform:translateY(-50%) scaleY(1)}
.yt-anchor__note{
  margin-top:14px;padding-top:14px;border-top:1px dashed var(--yt-line);
  font-size:12.5px;color:var(--yt-ink-3);line-height:1.7;
}

/* ============ 步骤区块 ============ */
.yt-step{
  background:#fff;border:1px solid var(--yt-line);border-radius:var(--yt-radius-card);
  padding:32px;box-shadow:var(--yt-shadow-sm);
  scroll-margin-top:96px;
  transition:box-shadow var(--yt-ease),border-color var(--yt-ease);
}
.yt-step + .yt-step{margin-top:24px}
.yt-step:hover{box-shadow:var(--yt-shadow-md);border-color:rgba(26,95,224,.22)}
.yt-step__head{display:flex;align-items:center;gap:16px;margin-bottom:18px}
.yt-step__num{
  width:46px;height:46px;flex-shrink:0;border-radius:50%;
  background:var(--yt-primary-light);color:var(--yt-primary);
  display:flex;align-items:center;justify-content:center;
  font-size:17px;font-weight:700;font-variant-numeric:tabular-nums;
}
.yt-step__head h2{font-size:24px}
.yt-step__body p{color:var(--yt-ink-2);margin-bottom:14px}
.yt-step__body p:last-of-type{margin-bottom:20px}
.yt-points{display:grid;gap:10px;margin-bottom:22px}
.yt-points li{
  display:flex;gap:10px;align-items:flex-start;
  font-size:15px;color:var(--yt-ink-2);
}
.yt-points li svg{flex-shrink:0;margin-top:4px;color:var(--yt-teal)}
.yt-step__figure{
  position:relative;border-radius:var(--yt-radius-img);overflow:hidden;
  border:1px solid var(--yt-line);
}
.yt-step__figure img{width:100%;height:280px;object-fit:cover;transition:transform 400ms ease-out}
.yt-step__figure:hover img{transform:scale(1.03)}
.yt-step__badge{
  position:absolute;left:14px;bottom:14px;
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 12px;border-radius:999px;
  background:rgba(255,255,255,.94);
  font-size:12.5px;font-weight:600;color:var(--yt-ink-2);
  box-shadow:var(--yt-shadow-sm);
}
.yt-step__badge i{width:7px;height:7px;border-radius:50%;background:var(--yt-teal);display:inline-block}

/* ============ FAQ ============ */
.yt-faq{display:grid;gap:12px;margin-top:28px}
.yt-faq__item{
  background:#fff;border:1px solid transparent;border-radius:12px;
  box-shadow:var(--yt-shadow-sm);
  transition:box-shadow var(--yt-ease),border-color var(--yt-ease);
}
.yt-faq__item:hover{box-shadow:var(--yt-shadow-md)}
.yt-faq__item[open]{
  border-color:var(--yt-line);
  box-shadow:inset 3px 0 0 var(--yt-primary),var(--yt-shadow-md);
}
.yt-faq__item summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;cursor:pointer;
  font-size:16.5px;font-weight:600;color:var(--yt-ink);
  list-style:none;
}
.yt-faq__item summary::-webkit-details-marker{display:none}
.yt-faq__item[open] summary{color:var(--yt-primary)}
.yt-faq__icon{
  position:relative;width:26px;height:26px;flex-shrink:0;border-radius:50%;
  border:1.5px solid var(--yt-line);background:#fff;
  transition:border-color var(--yt-ease),background var(--yt-ease);
}
.yt-faq__icon::before,.yt-faq__icon::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--yt-ink-2);border-radius:2px;
  transform:translate(-50%,-50%);
  transition:transform var(--yt-ease),background var(--yt-ease),opacity var(--yt-ease);
}
.yt-faq__icon::before{width:11px;height:1.6px}
.yt-faq__icon::after{width:1.6px;height:11px}
.yt-faq__item[open] .yt-faq__icon{border-color:var(--yt-primary);background:var(--yt-primary-light)}
.yt-faq__item[open] .yt-faq__icon::before{background:var(--yt-primary)}
.yt-faq__item[open] .yt-faq__icon::after{opacity:0;transform:translate(-50%,-50%) scaleY(0)}
.yt-faq__content{
  padding:0 20px 20px;font-size:15px;color:var(--yt-ink-2);line-height:1.8;
}

/* ============ CTA 大卡 ============ */
.yt-cta{
  background:linear-gradient(135deg,#EAF1FE 0%,#F5F8FD 100%);
  border:1px solid #D8E4FA;
  border-radius:20px;
  padding:44px 40px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  flex-wrap:wrap;
}
.yt-cta h2{font-size:26px;margin-bottom:8px}
.yt-cta p{font-size:15px;color:var(--yt-ink-2);max-width:560px}
.yt-cta__actions{display:flex;gap:12px;flex-wrap:wrap}

/* ============ 页脚 ============ */
.yt-footer{
  background:var(--yt-ink);color:#B9C4D6;
  border-top:2px solid var(--yt-primary);
  padding:56px 0 0;margin-top:72px;
}
.yt-footer__grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;
  padding-bottom:40px;
}
.yt-footer__brand{display:flex;flex-direction:column;gap:14px}
.yt-footer__logo{
  display:flex;align-items:center;gap:10px;
  color:#fff;font-size:16px;font-weight:700;
}
.yt-footer__logo:hover{color:#fff;opacity:.88}
.yt-footer__desc{font-size:13.5px;line-height:1.8;color:#B9C4D6;max-width:320px}
.yt-footer__contact{font-size:13.5px;color:#8FA0B8}
.yt-footer h3{
  font-size:14px;color:#fff;font-weight:600;margin-bottom:16px;letter-spacing:.02em;
}
.yt-footer__links{display:flex;flex-direction:column;gap:12px}
.yt-footer__links a{font-size:14px;color:#B9C4D6}
.yt-footer__links a:hover{color:#fff;text-decoration:underline}
.yt-footer__bottom{
  border-top:1px solid rgba(255,255,255,.10);
  padding:20px 0 28px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:#8FA0B8;
}
.yt-footer__bottom a{color:#B9C4D6}
.yt-footer__bottom a:hover{color:#fff}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .yt-layout{grid-template-columns:200px 1fr;gap:32px}
}
@media (max-width:991px){
  .yt-nav{display:none}
  .yt-search{display:none}
  .yt-burger{display:inline-flex}
  .yt-header__actions .yt-btn--accent{display:none}
  .yt-cat-hero h1{font-size:32px}
  .yt-cat-hero__desc{font-size:16px}
  .yt-quick__grid{grid-template-columns:1fr;gap:18px}
  .yt-layout{grid-template-columns:1fr;gap:24px}
  .yt-anchor{
    position:static;
    display:flex;gap:8px;overflow-x:auto;padding:12px;
    border-radius:14px;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  .yt-anchor::-webkit-scrollbar{display:none}
  .yt-anchor__title,.yt-anchor__note{display:none}
  .yt-anchor__link{
    flex:0 0 auto;white-space:nowrap;
    padding:8px 14px;border-radius:999px;background:#F8FAFE;font-size:13.5px;
  }
  .yt-anchor__link::before{display:none}
  .yt-section{padding:56px 0}
  .yt-step{padding:24px}
  .yt-step__head h2{font-size:20px}
  .yt-cta{padding:32px 24px}
  .yt-footer__grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .yt-container{padding:0 18px}
  .yt-cat-hero{padding:32px 0 44px;min-height:240px}
  .yt-cat-hero h1{font-size:28px}
  .yt-quick{margin-top:-24px}
  .yt-quick__grid{padding:20px}
  .yt-step__figure img{height:200px}
  .yt-cta h2{font-size:22px}
  .yt-cta__actions{width:100%}
  .yt-cta__actions .yt-btn{flex:1 1 auto}
  .yt-footer{padding-top:40px;margin-top:56px}
  .yt-footer__grid{grid-template-columns:1fr;gap:28px}
  .yt-footer__bottom{flex-direction:column;align-items:flex-start;gap:10px}
}
@media (max-width:420px){
  .yt-cat-hero h1{font-size:25px}
  .yt-step{padding:20px}
  .yt-btn{width:100%}
  .yt-cta__actions .yt-btn{width:100%}
  .yt-logo span{font-size:15px}
}

/* roulang page: category2 */
:root{
  --yt-primary:#1A5FE0;
  --yt-primary-dark:#1449B4;
  --yt-primary-50:#EAF1FE;
  --yt-accent:#FF6A2B;
  --yt-accent-50:#FFF1E9;
  --yt-teal:#0FA98F;
  --yt-ink:#101B2D;
  --yt-sub:#46536B;
  --yt-muted:#7C8AA0;
  --yt-bg:#F5F8FD;
  --yt-line:#E4EAF3;
  --yt-card:#FFFFFF;
  --yt-radius-card:16px;
  --yt-radius-btn:10px;
  --yt-radius-img:12px;
  --yt-shadow-sm:0 1px 3px rgba(16,27,45,.05);
  --yt-shadow-md:0 6px 16px rgba(16,27,45,.07);
  --yt-shadow-lg:0 16px 40px rgba(16,27,45,.10);
  --yt-ease:180ms ease-out;
  --bs-primary:#1A5FE0;
  --bs-primary-rgb:26,95,224;
  --bs-body-color:#101B2D;
  --bs-body-bg:#F5F8FD;
  --bs-border-color:#E4EAF3;
  --bs-link-color:#1A5FE0;
  --bs-link-hover-color:#1449B4;
  --bs-font-sans-serif:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--yt-ink);
  background:var(--yt-bg);
}
img{max-width:100%;display:block;}
a{color:var(--yt-primary);text-decoration:none;transition:color var(--yt-ease),opacity var(--yt-ease);}
a:hover{color:var(--yt-primary-dark);}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;line-height:1.25;color:var(--yt-ink);font-weight:700;letter-spacing:.2px;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--yt-primary);outline-offset:2px;}
.yt-container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
.yt-anchor{display:block;position:relative;top:-84px;visibility:hidden;}
[id]{scroll-margin-top:92px;}

/* ============ 导航 ============ */
.yt-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--yt-line);
  transition:box-shadow var(--yt-ease);
}
.yt-header.is-scrolled{box-shadow:var(--yt-shadow-sm);}
.yt-header__inner{display:flex;align-items:center;gap:16px;height:68px;}
.yt-logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--yt-ink);font-size:17px;font-weight:700;white-space:nowrap;}
.yt-logo:hover{color:var(--yt-primary);}
.yt-logo svg{display:block;flex:0 0 auto;}
.yt-nav{display:flex;align-items:center;gap:4px;margin-left:10px;}
.yt-nav__link{
  position:relative;padding:8px 14px;border-radius:999px;
  font-size:15px;color:var(--yt-sub);
  transition:color var(--yt-ease),background var(--yt-ease);
}
.yt-nav__link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;border-radius:2px;
  background:var(--yt-primary);transform:scaleX(0);transform-origin:left;
  transition:transform var(--yt-ease);
}
.yt-nav__link:hover{color:var(--yt-primary);}
.yt-nav__link:hover::after{transform:scaleX(1);}
.yt-nav__link.is-active{color:var(--yt-primary);background:var(--yt-primary-50);font-weight:600;}
.yt-nav__link.is-active::after{transform:scaleX(0);}
.yt-header__actions{display:flex;align-items:center;gap:12px;margin-left:auto;}
.yt-search{position:relative;width:220px;flex:0 0 auto;}
.yt-search svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--yt-muted);pointer-events:none;}
.yt-search input{
  width:100%;height:38px;border-radius:var(--yt-radius-btn);
  border:1px solid var(--yt-line);background:#F7FAFF;
  padding:0 12px 0 36px;font-size:14px;color:var(--yt-ink);
  transition:border-color var(--yt-ease),box-shadow var(--yt-ease),background var(--yt-ease);
}
.yt-search input::placeholder{color:var(--yt-muted);}
.yt-search input:focus{outline:none;border-color:var(--yt-primary);background:#fff;box-shadow:0 0 0 4px rgba(26,95,224,.08);}
.yt-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 18px;border-radius:var(--yt-radius-btn);
  font-size:15px;font-weight:600;white-space:nowrap;cursor:pointer;
  border:1.5px solid transparent;
  transition:background var(--yt-ease),color var(--yt-ease),border-color var(--yt-ease),box-shadow var(--yt-ease),transform var(--yt-ease),filter var(--yt-ease);
}
.yt-btn--accent{background:var(--yt-accent);color:#fff;box-shadow:var(--yt-shadow-sm);}
.yt-btn--accent:hover{background:#F05C1E;color:#fff;transform:translateY(-1px);box-shadow:var(--yt-shadow-md);}
.yt-btn--outline{background:#fff;border-color:var(--yt-primary);color:var(--yt-primary);}
.yt-btn--outline:hover{background:var(--yt-primary-50);border-color:var(--yt-primary-dark);color:var(--yt-primary-dark);transform:translateY(-1px);box-shadow:var(--yt-shadow-sm);}
.yt-btn--text{background:transparent;color:var(--yt-primary);padding:0 12px;}
.yt-btn--text:hover{background:var(--yt-primary-50);color:var(--yt-primary-dark);}
.yt-btn--lg{height:48px;padding:0 26px;font-size:16px;}
.yt-btn:disabled,.yt-btn.is-disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none;}
.yt-burger{
  display:none;width:40px;height:40px;border-radius:var(--yt-radius-btn);
  border:1px solid var(--yt-line);background:#fff;color:var(--yt-ink);
  align-items:center;justify-content:center;cursor:pointer;
  transition:border-color var(--yt-ease),color var(--yt-ease);
}
.yt-burger:hover{border-color:var(--yt-primary);color:var(--yt-primary);}

/* ============ 抽屉 ============ */
.yt-drawer{width:320px;max-width:88vw;border:0;}
.yt-drawer .offcanvas-header{border-bottom:1px solid var(--yt-line);padding:16px 20px;}
.yt-drawer__title{font-size:16px;font-weight:700;color:var(--yt-ink);}
.yt-drawer .offcanvas-body{padding:20px;}
.yt-search--drawer{width:100%;margin-bottom:20px;}
.yt-drawer__nav{display:grid;gap:6px;margin-bottom:22px;}
.yt-drawer__nav a{
  padding:11px 14px;border-radius:10px;font-size:15px;color:var(--yt-sub);
  border:1px solid transparent;transition:all var(--yt-ease);
}
.yt-drawer__nav a:hover{background:var(--yt-primary-50);color:var(--yt-primary);}
.yt-drawer__nav a.is-active{background:var(--yt-primary-50);color:var(--yt-primary);font-weight:600;border-color:rgba(26,95,224,.18);}
.yt-drawer__actions{display:grid;gap:10px;}

/* ============ 页面头图 ============ */
.yt-hero{background:#fff;padding:34px 0 34px;border-bottom:1px solid var(--yt-line);}
.yt-breadcrumb{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--yt-muted);margin-bottom:14px;}
.yt-breadcrumb a{color:var(--yt-muted);}
.yt-breadcrumb a:hover{color:var(--yt-primary);}
.yt-breadcrumb span[aria-current]{color:var(--yt-sub);}
.yt-hero h1{font-size:34px;margin-bottom:12px;}
.yt-hero__lead{max-width:760px;font-size:16px;color:var(--yt-sub);}
.yt-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.yt-tab{
  display:inline-flex;align-items:center;gap:8px;padding:9px 18px;border-radius:999px;
  border:1px solid var(--yt-line);background:#fff;color:var(--yt-sub);font-size:14px;
  transition:all var(--yt-ease);
}
.yt-tab:hover{border-color:rgba(26,95,224,.35);color:var(--yt-primary);}
.yt-tab.is-active{background:var(--yt-primary-50);border-color:transparent;color:var(--yt-primary);font-weight:600;}
.yt-tab__dot{width:7px;height:7px;border-radius:50%;background:var(--yt-teal);}

/* ============ 板块 ============ */
.yt-section{padding:88px 0;}
.yt-section--tight{padding:64px 0;}
.yt-section--alt{background:#fff;}
.yt-section__head{max-width:780px;margin-bottom:40px;}
.yt-section__head h2{font-size:30px;margin-bottom:12px;}
.yt-section__head p{font-size:16px;color:var(--yt-sub);}
.yt-eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:999px;
  background:var(--yt-primary-50);color:var(--yt-primary-dark);
  font-size:12.5px;font-weight:600;margin-bottom:14px;
}
.yt-eyebrow__dot{width:7px;height:7px;border-radius:50%;background:var(--yt-teal);}

/* ============ 表格 ============ */
.yt-table-wrap{
  background:var(--yt-card);border:1px solid var(--yt-line);border-radius:var(--yt-radius-img);
  overflow:hidden;box-shadow:var(--yt-shadow-sm);
}
.yt-table-scroll{overflow-x:auto;}
table.yt-table{width:100%;min-width:660px;border-collapse:collapse;margin:0;font-size:15px;}
.yt-table thead th{
  background:var(--yt-primary-50);color:var(--yt-primary-dark);
  font-size:14.5px;font-weight:600;text-align:left;
  padding:14px 18px;border:0;white-space:nowrap;
}
.yt-table tbody td{
  padding:14px 18px;border-top:1px solid var(--yt-line);
  color:var(--yt-sub);line-height:1.7;vertical-align:top;
}
.yt-table tbody tr:nth-child(even){background:#F8FAFE;}
.yt-table tbody tr:hover{background:#F2F7FF;}
.yt-table td:first-child{color:#5C6B82;width:48%;}
.yt-table td:last-child{color:var(--yt-ink);}
.yt-table__tag{
  display:inline-block;margin-right:8px;padding:1px 8px;border-radius:999px;
  background:#F1F4F9;color:var(--yt-muted);font-size:12px;line-height:1.7;
}
.yt-table__tag--ok{background:rgba(15,169,143,.12);color:#0B8C76;}
.yt-table__note{margin-top:14px;font-size:13px;color:var(--yt-muted);}

/* ============ 风险卡 ============ */
.yt-risk-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.yt-risk-card{
  background:var(--yt-accent-50);border:1px solid rgba(255,106,43,.28);
  border-radius:var(--yt-radius-card);padding:24px;
  transition:box-shadow var(--yt-ease),transform var(--yt-ease),border-color var(--yt-ease);
}
.yt-risk-card:hover{box-shadow:var(--yt-shadow-md);transform:translateY(-2px);border-color:rgba(255,106,43,.45);}
.yt-risk-card__icon{
  width:42px;height:42px;border-radius:12px;background:#fff;
  border:1.5px solid rgba(255,106,43,.5);color:var(--yt-accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.yt-risk-card h3{font-size:19px;margin-bottom:8px;}
.yt-risk-card p{font-size:14px;color:var(--yt-sub);}
.yt-risk-card__meta{margin-top:14px;font-size:12.5px;color:#B8552A;font-weight:600;letter-spacing:.4px;}

/* ============ FAQ ============ */
.yt-faq{display:grid;gap:12px;max-width:900px;}
.yt-faq__item{
  background:#fff;border:1px solid var(--yt-line);border-radius:12px;overflow:hidden;
  transition:box-shadow var(--yt-ease),border-color var(--yt-ease);
}
.yt-faq__item:hover{box-shadow:var(--yt-shadow-sm);}
.yt-faq__q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:transparent;border:0;text-align:left;cursor:pointer;
  font-size:16.5px;font-weight:600;color:var(--yt-ink);
  box-shadow:inset 0 0 0 0 var(--yt-primary);
  transition:color var(--yt-ease),box-shadow var(--yt-ease);
}
.yt-faq__q:hover{color:var(--yt-primary);}
.yt-faq__q[aria-expanded="true"]{color:var(--yt-primary);box-shadow:inset 3px 0 0 var(--yt-primary);}
.yt-faq__icon{position:relative;flex:0 0 auto;width:26px;height:26px;border-radius:50%;border:1px solid var(--yt-line);background:#fff;}
.yt-faq__icon i{
  position:absolute;left:50%;top:50%;width:12px;height:2px;border-radius:2px;
  background:var(--yt-primary);transform:translate(-50%,-50%);
  transition:transform var(--yt-ease);
}
.yt-faq__icon i+i{transform:translate(-50%,-50%) rotate(90deg);}
.yt-faq__q[aria-expanded="true"] .yt-faq__icon i+i{transform:translate(-50%,-50%) rotate(90deg) scaleX(0);}
.yt-faq__a{padding:0 20px 20px;font-size:15px;color:var(--yt-sub);line-height:1.85;max-width:760px;}

/* ============ 相关分类 ============ */
.yt-rel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.yt-rel-card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--yt-line);
  border-radius:var(--yt-radius-card);overflow:hidden;color:var(--yt-ink);
  transition:box-shadow var(--yt-ease),transform var(--yt-ease),border-color var(--yt-ease);
}
.yt-rel-card:hover{box-shadow:var(--yt-shadow-md);transform:translateY(-2px);border-color:rgba(26,95,224,.22);color:var(--yt-ink);}
.yt-rel-card__media{height:186px;overflow:hidden;background:#E9EFF9;}
.yt-rel-card__media img{width:100%;height:100%;object-fit:cover;transition:transform var(--yt-ease);}
.yt-rel-card:hover .yt-rel-card__media img{transform:scale(1.03);}
.yt-rel-card__body{padding:22px 24px 24px;}
.yt-rel-card__body h3{font-size:20px;margin-bottom:10px;}
.yt-rel-card__body p{font-size:14px;color:var(--yt-sub);margin-bottom:16px;}
.yt-rel-card__link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--yt-primary);}
.yt-rel-card__link svg{transition:transform var(--yt-ease);}
.yt-rel-card:hover .yt-rel-card__link svg{transform:translateX(3px);}

/* ============ CTA ============ */
.yt-cta{
  background:var(--yt-primary-50);border-radius:20px;padding:48px 40px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.yt-cta__text{max-width:620px;}
.yt-cta__text h2{font-size:28px;margin-bottom:10px;}
.yt-cta__text p{font-size:15px;color:var(--yt-sub);}
.yt-cta__actions{display:flex;gap:12px;flex-wrap:wrap;}
.yt-trust{
  display:flex;flex-wrap:wrap;gap:26px;margin-top:28px;padding-top:22px;
  border-top:1px solid var(--yt-line);
}
.yt-trust__item{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--yt-muted);}

/* ============ 页脚 ============ */
.yt-footer{
  background:#101B2D;color:#B9C4D6;margin-top:40px;
  padding:56px 0 0;border-top:2px solid var(--yt-primary);
}
.yt-footer__grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:32px;}
.yt-footer__logo{
  display:inline-flex;align-items:center;gap:10px;color:#fff;font-size:16px;
  font-weight:700;margin-bottom:14px;
}
.yt-footer__logo:hover{color:#fff;}
.yt-footer__desc{font-size:13.5px;line-height:1.8;color:#B9C4D6;max-width:330px;}
.yt-footer__contact{margin-top:12px;font-size:13px;color:#8E9CB3;}
.yt-footer h3{font-size:15px;color:#fff;margin-bottom:16px;font-weight:600;}
.yt-footer__links{display:grid;gap:10px;}
.yt-footer__links a{color:#B9C4D6;font-size:14px;}
.yt-footer__links a:hover{color:#fff;text-decoration:underline;}
.yt-footer__bottom{
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
  margin-top:44px;padding:20px 0 28px;border-top:1px solid rgba(255,255,255,.08);
  font-size:13px;color:#8E9CB3;
}
.yt-footer__bottom a{color:#B9C4D6;}
.yt-footer__bottom a:hover{color:#fff;text-decoration:underline;}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .yt-search{width:170px;}
  .yt-nav__link{padding:8px 11px;font-size:14.5px;}
}
@media (max-width:991px){
  .yt-nav{display:none;}
  .yt-search{display:none;}
  .yt-header__actions .yt-btn--text{display:none;}
  .yt-burger{display:inline-flex;}
  .yt-hero h1{font-size:28px;}
  .yt-section{padding:64px 0;}
  .yt-section--tight{padding:48px 0;}
  .yt-section__head h2{font-size:25px;}
  .yt-risk-grid{grid-template-columns:1fr;}
  .yt-rel-grid{grid-template-columns:1fr;}
  .yt-cta{padding:36px 26px;}
  .yt-cta__text h2{font-size:24px;}
  .yt-footer__grid{grid-template-columns:1fr 1fr;gap:28px;}
}
@media (max-width:767px){
  .yt-header__inner{height:62px;gap:10px;}
  .yt-logo{font-size:15px;}
  .yt-hero{padding:26px 0 28px;}
  .yt-hero h1{font-size:24px;}
  .yt-hero__lead{font-size:15px;}
  .yt-section{padding:56px 0;}
  .yt-section__head{margin-bottom:28px;}
  .yt-section__head h2{font-size:22px;}
  .yt-cta__actions{width:100%;}
  .yt-cta__actions .yt-btn{flex:1 1 100%;}
  .yt-footer__grid{grid-template-columns:1fr;}
  .yt-footer__bottom{flex-direction:column;align-items:flex-start;}
}
@media (max-width:420px){
  .yt-container{padding:0 16px;}
  .yt-header__actions .yt-btn--accent{padding:0 14px;font-size:14px;}
  .yt-tab{width:100%;justify-content:center;}
  .yt-faq__q{font-size:15.5px;padding:16px 16px;}
  .yt-faq__a{padding:0 16px 18px;}
}