/* ===== 设计令牌 ===== */
:root {
  --bg:#ffffff; --bg-alt:#f7f7f5; --bg-dark:#0f0f10; --surface:#ffffff;
  --text:#16161a; --text-muted:#6b6b73; --text-faint:#9a9aa3;
  --border:#e8e8e3; --border-strong:#d8d8d2;
  --accent:#c9a961; --accent-dark:#a8884a; --accent-soft:#f5efde;
  --black:#16161a; --free:#4a9d6c; --free-soft:#e8f3ec; --member:#c9a961; --paid:#d97757;
  --danger:#d9504a; --danger-soft:#fbeae9;
  --shadow-sm:0 1px 2px rgba(16,16,20,.04),0 1px 1px rgba(16,16,20,.03);
  --shadow-md:0 4px 16px rgba(16,16,20,.06),0 1px 4px rgba(16,16,20,.04);
  --shadow-lg:0 16px 48px rgba(16,16,20,.10),0 4px 12px rgba(16,16,20,.06);
  --r-sm:6px; --r-md:10px; --r-lg:16px; --r-xl:22px;
  --font:"Noto Sans SC","Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --font-num:"Inter","Noto Sans SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.6;font-size:15px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
img,svg{display:block;max-width:100%}
ul{list-style:none}
input,select,textarea{font-family:inherit}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:14px;font-weight:500;line-height:1;padding:10px 18px;border-radius:var(--r-sm);transition:all .18s ease;white-space:nowrap;border:1px solid transparent}
.btn--primary{background:var(--black);color:#fff}
.btn--primary:hover{background:#2a2a30;transform:translateY(-1px)}
.btn--gold{background:var(--accent);color:#fff}
.btn--gold:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn--ghost{background:transparent;border-color:var(--border-strong);color:var(--text)}
.btn--ghost:hover{border-color:var(--text);background:var(--bg-alt)}
.btn--text{background:transparent;color:var(--text);padding:10px 12px}
.btn--text:hover{color:var(--accent-dark)}
.btn--danger{background:var(--danger);color:#fff}
.btn--danger:hover{background:#b93d37}
.btn--lg{padding:14px 26px;font-size:15px}
.btn--sm{padding:7px 12px;font-size:13px}
.btn--block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ===== 顶栏 ===== */
.topbar{background:var(--bg-dark);color:#b8b8bf;font-size:12.5px}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;height:36px}
.topbar__links{display:flex;align-items:center;gap:10px}
.topbar__link{color:var(--accent)}
.topbar__link:hover{color:#fff}
.topbar__sep{color:#4a4a52}
.topbar__lang{color:#fff}
.topbar__lang--muted{color:#6b6b73}

/* ===== 导航 ===== */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .2s}
.header--scrolled{box-shadow:var(--shadow-sm)}
.header__inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:8px;font-weight:900;font-size:19px;letter-spacing:-.01em}
.brand__mark{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:var(--black);color:var(--accent);border-radius:7px;font-size:13px;font-weight:900;letter-spacing:-.02em}
.brand__name{color:var(--text)}
.brand--light .brand__name{color:#fff}
.nav{display:flex;align-items:center;gap:4px}
.nav__link{font-size:14.5px;font-weight:500;color:var(--text-muted);padding:8px 14px;border-radius:var(--r-sm);transition:all .15s}
.nav__link:hover{color:var(--text);background:var(--bg-alt)}
.nav__link--active{color:var(--text)}
.header__actions{display:flex;align-items:center;gap:8px}
.header__burger{display:none;flex-direction:column;gap:4px;padding:8px}
.header__burger span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px}

/* ===== Hero ===== */
.hero{padding:64px 0 72px;border-bottom:1px solid var(--border)}
.hero__inner{display:grid;grid-template-columns:1.15fr 1fr;gap:56px;align-items:center}
.hero__eyebrow{font-size:13px;color:var(--accent-dark);font-weight:500;margin-bottom:18px}
.hero__title{font-size:60px;font-weight:900;line-height:1.05;letter-spacing:-.03em;margin-bottom:22px}
.hero__sub{font-size:17px;color:var(--text-muted);line-height:1.65;max-width:520px;margin-bottom:32px}
.hero__cta{display:flex;gap:12px;margin-bottom:48px}
.hero__stats{display:flex;gap:40px}
.hero__stat{display:flex;flex-direction:column}
.hero__stat-num{font-family:var(--font-num);font-size:28px;font-weight:700;letter-spacing:-.02em}
.hero__stat-label{font-size:13px;color:var(--text-faint);margin-top:2px}
.hero__visual{position:relative}
.hero__card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-md)}
.hero__card--main{padding:16px}
.hero__card-tag{display:inline-block;font-size:12px;font-weight:600;color:var(--accent-dark);background:var(--accent-soft);padding:4px 10px;border-radius:20px;margin-bottom:14px}
.hero__card-thumb{position:relative;height:180px;border-radius:var(--r-md);background:linear-gradient(135deg,#1a1a20 0%,#2d2a22 50%,#3d3520 100%);display:flex;align-items:center;justify-content:center;margin-bottom:16px;overflow:hidden;background-size:cover;background-position:center}
.hero__card-thumb::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 70% 30%,rgba(201,169,97,.25),transparent 60%)}
.hero__card-play{color:#fff;opacity:.92;position:relative;z-index:1;transition:.2s}
.hero__card--main:hover .hero__card-play{transform:scale(1.1);opacity:1}
.hero__card-meta{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.hero__card-cat{font-size:12.5px;color:var(--text-faint);font-weight:500}
.hero__card-title{font-size:19px;font-weight:700;line-height:1.35;margin-bottom:14px}
.hero__card-foot{display:flex;gap:14px;font-size:13px;color:var(--text-faint)}
.hero__card--sub{position:absolute;right:-28px;bottom:-32px;width:280px;padding:18px;display:flex;flex-direction:column;gap:8px;box-shadow:var(--shadow-lg)}
.hero__card-num{font-family:var(--font-num);font-size:13px;color:var(--text-faint);font-weight:600}
.hero__card-stitle{font-size:15px;font-weight:600;line-height:1.4}
.hero__card--sub .hero__card-foot{font-size:12.5px}

/* ===== 徽章 ===== */
.badge{display:inline-flex;align-items:center;font-size:11.5px;font-weight:600;padding:3px 9px;border-radius:20px;letter-spacing:.01em}
.badge--free{color:var(--free);background:var(--free-soft)}
.badge--member{color:var(--accent-dark);background:var(--accent-soft)}
.badge--paid{color:#fff;background:var(--paid)}
.badge--vip{color:#fff;background:var(--accent)}
.badge--draft{color:#8a6d3b;background:#fcf3d6}

/* ===== 区块标题 ===== */
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:32px;gap:16px}
.section-head--center{text-align:center;flex-direction:column;align-items:center}
.section-eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--accent-dark);letter-spacing:.03em;text-transform:uppercase;margin-bottom:12px}
.section-title{font-size:34px;font-weight:900;letter-spacing:-.02em;line-height:1.15}
.section-title--sm{font-size:26px}
.section-sub{font-size:15px;color:var(--text-muted);margin-top:8px}
.section-link{font-size:14px;font-weight:500;color:var(--text);border-bottom:1px solid var(--border-strong);padding-bottom:2px;transition:.15s}
.section-link:hover{color:var(--accent-dark);border-color:var(--accent)}

/* ===== Tabs ===== */
.tabs{display:flex;gap:6px;margin-bottom:32px;border-bottom:1px solid var(--border)}
.tab{font-size:14.5px;font-weight:500;color:var(--text-muted);padding:12px 18px;position:relative;transition:.15s}
.tab:hover{color:var(--text)}
.tab--active{color:var(--text)}
.tab--active::after{content:"";position:absolute;left:18px;right:18px;bottom:-1px;height:2px;background:var(--black);border-radius:2px}

/* ===== 内容卡片网格 ===== */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;transition:all .2s ease;display:flex;flex-direction:column}
.card:hover{border-color:var(--border-strong);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.card__media{position:relative;aspect-ratio:16/9;background:var(--bg-alt);background-size:cover;background-position:center;overflow:hidden}
.card__media img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.card__cover{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.card:hover .card__media img{transform:scale(1.04)}
.card__media--video{background:linear-gradient(135deg,#1a1a20,#2d2a22);display:flex;align-items:center;justify-content:center}
.card__media--article{background:linear-gradient(135deg,#f5efde,#faf6ea);display:flex;align-items:center;justify-content:center}
.card__media--resource{background:linear-gradient(135deg,#e8f0f5,#eef4f8);display:flex;align-items:center;justify-content:center}
.card__media-icon{width:44px;height:44px;color:rgba(255,255,255,.7)}
.card__media--article .card__media-icon,.card__media--resource .card__media-icon{color:rgba(20,20,26,.35)}
.card__top{position:absolute;top:12px;left:12px;right:12px;display:flex;align-items:center;justify-content:space-between;z-index:2}
.card__num{font-family:var(--font-num);font-size:12px;font-weight:600;color:rgba(255,255,255,.85);background:rgba(0,0,0,.35);padding:3px 8px;border-radius:4px;backdrop-filter:blur(4px)}
.card__media--article .card__num,.card__media--resource .card__num{color:var(--text-muted);background:rgba(255,255,255,.8)}
.card__play-icon{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#fff;opacity:0;transition:.2s;z-index:2}
.card:hover .card__play-icon{opacity:.9}
.card__play-icon svg{width:48px;height:48px}
.card__body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.card__meta{display:flex;align-items:center;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.card__cat{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint)}
.card__title{font-size:16.5px;font-weight:700;line-height:1.4;margin-bottom:8px;flex:1}
.card__title a:hover{color:var(--accent-dark)}
.card__desc{font-size:13.5px;color:var(--text-muted);line-height:1.55;margin-bottom:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card__foot{display:flex;align-items:center;justify-content:space-between;padding-top:14px;border-top:1px solid var(--border)}
.card__info{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text-faint)}
.card__price{font-family:var(--font-num);font-size:15px;font-weight:700;color:var(--paid)}
.card__price-vip{font-size:12px;color:var(--accent-dark);font-weight:600}

/* ===== 单篇付费 ===== */
.pay-per-item{background:var(--bg-alt);padding:80px 0}
.pay-per-item__inner{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.pay-per-item__list{display:flex;flex-direction:column;gap:14px;margin-top:28px}
.pay-per-item__list li{display:flex;align-items:center;gap:12px;font-size:15px}
.dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0}
.price-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-xl);padding:28px;box-shadow:var(--shadow-lg)}
.price-card__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.price-card__num{font-family:var(--font-num);font-size:13px;color:var(--text-faint);font-weight:600}
.price-card__title{font-size:22px;font-weight:800;line-height:1.3;margin-bottom:10px}
.price-card__desc{font-size:14px;color:var(--text-muted);line-height:1.6;margin-bottom:16px}
.price-card__meta{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--text-faint);flex-wrap:wrap;margin-bottom:22px}
.price-card__foot{display:flex;align-items:center;justify-content:space-between;padding-top:22px;border-top:1px solid var(--border)}
.price-card__price{font-family:var(--font-num);font-size:30px;font-weight:800;letter-spacing:-.02em}
.price-card__orig{font-family:var(--font-num);font-size:15px;color:var(--text-faint);text-decoration:line-through;margin-left:6px}

/* ===== 定价 ===== */
.pricing{padding:88px 0}
.billing-toggle{display:flex;align-items:center;justify-content:center;gap:12px;margin:32px auto 48px}
.billing-toggle__label{font-size:14.5px;font-weight:500;color:var(--text-faint);transition:.15s}
.billing-toggle__label--active{color:var(--text)}
.billing-toggle__switch{width:46px;height:26px;border-radius:20px;background:var(--border-strong);position:relative;transition:.2s}
.billing-toggle__switch--on{background:var(--black)}
.billing-toggle__knob{position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.billing-toggle__switch--on .billing-toggle__knob{transform:translateX(20px)}
.billing-toggle__save{font-size:12px;font-weight:600;color:var(--free);background:var(--free-soft);padding:3px 9px;border-radius:20px}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1000px;margin:0 auto}
.plan{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-xl);padding:32px 28px;display:flex;flex-direction:column;position:relative;transition:.2s}
.plan:hover{box-shadow:var(--shadow-md)}
.plan--featured{border:2px solid var(--accent);box-shadow:var(--shadow-md)}
.plan__tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;font-size:12px;font-weight:600;padding:5px 14px;border-radius:20px;white-space:nowrap}
.plan__name{font-size:18px;font-weight:700;margin-bottom:6px}
.plan__desc{font-size:13.5px;color:var(--text-muted);margin-bottom:24px}
.plan__price{display:flex;align-items:baseline;gap:4px;margin-bottom:4px}
.plan__price-num{font-family:var(--font-num);font-size:42px;font-weight:800;letter-spacing:-.03em}
.plan__price-unit{font-size:15px;color:var(--text-muted)}
.plan__price-old{font-family:var(--font-num);font-size:14px;color:var(--text-faint);text-decoration:line-through}
.plan__bill{font-size:13px;color:var(--text-faint);margin-bottom:26px}
.plan__features{display:flex;flex-direction:column;gap:12px;margin-bottom:30px;flex:1}
.plan__feat{display:flex;align-items:flex-start;gap:10px;font-size:14px;line-height:1.45}
.plan__feat--off{color:var(--text-faint)}
.plan__check{flex-shrink:0;width:18px;height:18px;color:var(--free);margin-top:1px}
.plan__check--off{color:var(--border-strong)}
.plan__cta{width:100%}
.pricing__note{text-align:center;font-size:13px;color:var(--text-faint);margin-top:36px}

/* ===== 订阅 ===== */
.subscribe{background:var(--bg-dark);color:#fff;padding:56px 0}
.subscribe__inner{display:flex;align-items:center;justify-content:space-between;gap:48px}
.subscribe .section-title{color:#fff}
.subscribe .section-sub{color:#b8b8bf}
.subscribe__form{display:flex;gap:10px;flex-shrink:0}
.subscribe__input{width:280px;padding:13px 16px;border-radius:var(--r-sm);border:1px solid #2a2a30;background:#1a1a1e;color:#fff;font-size:14px;transition:.15s}
.subscribe__input:focus{outline:none;border-color:var(--accent)}

/* ===== 页脚 ===== */
.footer{background:#0a0a0c;color:#9a9aa3;padding:64px 0 32px}
.footer__inner{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px}
.footer__col--brand{max-width:320px}
.brand--light .brand__mark{background:var(--accent);color:var(--black)}
.footer__about{font-size:13.5px;line-height:1.7;margin-top:16px}
.footer__title{color:#fff;font-size:14px;font-weight:600;margin-bottom:16px}
.footer__link{display:block;font-size:13.5px;color:#9a9aa3;padding:5px 0;transition:.15s}
.footer__link:hover{color:var(--accent)}
.footer__bottom{display:flex;justify-content:space-between;padding-top:28px;border-top:1px solid #1e1e22;font-size:12.5px;color:#6b6b73}

/* ===== 课程列表页 ===== */
.list-layout{display:grid;grid-template-columns:240px 1fr;gap:32px;padding:56px 0;align-items:start}
.sidebar{position:sticky;top:88px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:20px}
.sidebar__group{padding-bottom:18px;margin-bottom:18px;border-bottom:1px solid var(--border)}
.sidebar__group:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.sidebar__title{font-size:12px;font-weight:700;color:var(--text-faint);text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
.sidebar__item{display:block;font-size:14px;color:var(--text-muted);padding:7px 10px;border-radius:var(--r-sm);margin-bottom:2px;transition:.15s}
.sidebar__item:hover{background:var(--bg-alt);color:var(--text)}
.sidebar__item--active{background:var(--black);color:#fff;font-weight:500}
.list-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.list-count{font-size:14px;color:var(--text-muted)}
.list-count strong{color:var(--text)}
.sort{display:flex;gap:4px;align-items:center;font-size:13.5px}
.sort__opt{padding:6px 12px;border-radius:var(--r-sm);color:var(--text-muted);transition:.15s}
.sort__opt--active{background:var(--bg-alt);color:var(--text);font-weight:500}
.list-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.pagination{display:flex;gap:6px;justify-content:center;margin-top:40px}
.pagination a,.pagination span{min-width:36px;height:36px;padding:0 12px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--r-sm);font-size:14px;color:var(--text-muted)}
.pagination a:hover{border-color:var(--text);color:var(--text)}
.pagination .cur{background:var(--black);color:#fff;border-color:var(--black)}

/* ===== 详情页 ===== */
.detail{padding:40px 0 72px}
.detail__back{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--text-muted);margin-bottom:20px}
.detail__back:hover{color:var(--text)}
.detail__layout{display:grid;grid-template-columns:1fr 320px;gap:40px;align-items:start}
.detail__main{min-width:0}
.detail__player{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#1a1a20,#2d2a22);border-radius:var(--r-lg);overflow:hidden;display:flex;align-items:center;justify-content:center;margin-bottom:24px}
.detail__player img{width:100%;height:100%;object-fit:cover}
.detail__player-icon{width:72px;height:72px;color:rgba(255,255,255,.85)}
.detail__player--article{background:linear-gradient(135deg,#f5efde,#faf6ea)}
.detail__player--resource{background:linear-gradient(135deg,#e8f0f5,#eef4f8)}
.detail__player--article .detail__player-icon,.detail__player--resource .detail__player-icon{color:rgba(20,20,26,.3)}
.detail__lock{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:rgba(10,10,12,.7);backdrop-filter:blur(6px);color:#fff;padding:20px;text-align:center}
.detail__lock-icon{width:44px;height:44px;opacity:.85}
.detail__lock-text{font-size:14.5px;max-width:320px}
.detail__meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.detail__cat{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint)}
.detail__title{font-size:30px;font-weight:900;line-height:1.25;letter-spacing:-.02em;margin-bottom:14px}
.detail__info{display:flex;align-items:center;gap:14px;font-size:13.5px;color:var(--text-faint);padding:16px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-bottom:24px;flex-wrap:wrap}
.detail__content{font-size:16px;line-height:1.85;color:var(--text)}
.detail__content h2{font-size:22px;font-weight:800;margin:32px 0 14px;letter-spacing:-.01em}
.detail__content h3{font-size:18px;font-weight:700;margin:26px 0 12px}
.detail__content p{margin-bottom:16px}
.detail__content ul,.detail__content ol{margin:0 0 16px 1.2em}
.detail__content li{margin-bottom:6px;list-style:disc}
.detail__content code{background:var(--bg-alt);padding:2px 6px;border-radius:4px;font-family:Consolas,Monaco,monospace;font-size:.92em}
.detail__content pre{background:var(--bg-dark);color:#e8e8e3;padding:16px 18px;border-radius:var(--r-md);overflow-x:auto;margin-bottom:18px;font-size:14px}
.detail__content pre code{background:none;padding:0;color:inherit}
.detail__content img{max-width:100%;height:auto;border-radius:var(--r-md);margin:18px 0;box-shadow:0 4px 20px rgba(0,0,0,.08)}
.detail__content blockquote{border-left:4px solid var(--accent);padding:12px 20px;margin:18px 0;background:var(--bg-alt);border-radius:0 var(--r-md) var(--r-md) 0;color:var(--text-muted)}
.detail__content blockquote p:last-child{margin-bottom:0}
.detail__content figure{margin:18px 0}
.detail__content figcaption{font-size:13px;color:var(--text-faint);text-align:center;margin-top:6px}
.detail__paywall{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--r-lg);padding:28px;margin:24px 0;text-align:center}
.detail__paywall-title{font-size:18px;font-weight:700;margin-bottom:8px}
.detail__paywall-desc{font-size:14px;color:var(--text-muted);margin-bottom:20px}
.detail__paywall-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.detail__paywall-price{font-family:var(--font-num);font-size:28px;font-weight:800;margin-bottom:4px}
.detail__paywall-old{font-family:var(--font-num);font-size:14px;color:var(--text-faint);text-decoration:line-through;margin-left:6px}
.detail__sidebar{position:sticky;top:88px}
.detail__side-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:20px;margin-bottom:16px}
.detail__side-title{font-size:13px;font-weight:700;color:var(--text-faint);text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px}
.detail__side-item{display:block;padding:10px 0;border-top:1px solid var(--border)}
.detail__side-item:first-of-type{border-top:none}
.detail__side-item-title{font-size:14px;font-weight:500;line-height:1.4;margin-bottom:4px}
.detail__side-item:hover .detail__side-item-title{color:var(--accent-dark)}
.detail__side-item-meta{font-size:12px;color:var(--text-faint)}

/* ===== 会员中心 ===== */
.member{padding:48px 0 72px}
.member__hero{background:linear-gradient(135deg,#1a1a20,#2d2a22);color:#fff;border-radius:var(--r-xl);padding:36px;margin-bottom:40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.member__hero-name{font-size:24px;font-weight:800;margin-bottom:4px}
.member__hero-email{font-size:14px;color:#b8b8bf}
.member__hero-vip{display:flex;align-items:center;gap:14px}
.member__vip-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:20px;font-size:13px;font-weight:600}
.member__vip-badge--none{background:rgba(255,255,255,.1);color:#b8b8bf}
.member__vip-badge--pro{background:var(--accent);color:#fff}
.member__vip-badge--ulti{background:linear-gradient(135deg,#c9a961,#e8c878);color:#1a1a20}
.member__vip-expire{font-size:13px;color:#b8b8bf}
.member__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:48px}
.member__stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:24px}
.member__stat-num{font-family:var(--font-num);font-size:32px;font-weight:800;letter-spacing:-.02em}
.member__stat-label{font-size:13px;color:var(--text-muted);margin-top:4px}
.member__section{margin-bottom:48px}
.member__section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.member__section-title{font-size:20px;font-weight:800}
.table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden}
.table th,.table td{padding:14px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--border)}
.table th{background:var(--bg-alt);font-weight:600;color:var(--text-muted);font-size:13px}
.table tr:last-child td{border-bottom:none}
.table tr:hover td{background:#fafafa}
.table--compact th,.table--compact td{padding:10px 14px;font-size:13px}
.empty{text-align:center;padding:48px 20px;color:var(--text-faint);font-size:14px}

/* ===== 登录/注册 ===== */
.auth-page{min-height:calc(100vh - 100px);display:flex;align-items:center;justify-content:center;padding:48px 24px}
.auth-card{width:100%;max-width:420px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-xl);padding:36px;box-shadow:var(--shadow-md)}
.auth__title{font-size:24px;font-weight:800;margin-bottom:6px;text-align:center}
.auth__sub{font-size:14px;color:var(--text-muted);margin-bottom:24px;text-align:center}
.auth__form{display:flex;flex-direction:column;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field__label{font-size:13px;font-weight:500}
.field__input,.field__select,.field__textarea{padding:11px 14px;border-radius:var(--r-sm);border:1px solid var(--border-strong);font-size:14px;transition:.15s;background:var(--surface);width:100%}
.field__input:focus,.field__select:focus,.field__textarea:focus{outline:none;border-color:var(--black)}
.field__textarea{resize:vertical;min-height:120px;font-family:inherit}
.field__hint{font-size:12px;color:var(--text-faint)}
.field--row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.auth__divider{display:flex;align-items:center;gap:12px;margin:22px 0;color:var(--text-faint);font-size:13px}
.auth__divider::before,.auth__divider::after{content:"";flex:1;height:1px;background:var(--border)}
.auth__foot{text-align:center;font-size:13px;color:var(--text-muted);margin-top:18px}
.auth__foot a{color:var(--accent-dark);font-weight:600}

/* ===== Toast / Flash ===== */
.toast{position:fixed;bottom:32px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--black);color:#fff;padding:13px 22px;border-radius:var(--r-md);font-size:14px;box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:.3s;z-index:2000}
.toast--show{opacity:1;transform:translateX(-50%) translateY(0)}
.flash{padding:13px 22px;border-radius:var(--r-sm);font-size:14px;margin:16px 24px;max-width:1200px;margin-left:auto;margin-right:auto}
.flash--success{background:var(--free-soft);color:#2d7a4f}
.flash--error{background:var(--danger-soft);color:var(--danger)}
.flash--info{background:var(--accent-soft);color:var(--accent-dark)}

/* ===== 响应式 ===== */
@media (max-width:980px){
  .hero__inner{grid-template-columns:1fr;gap:48px}
  .hero__title{font-size:46px}
  .hero__visual{max-width:460px}
  .hero__card--sub{right:0}
  .grid{grid-template-columns:repeat(2,1fr)}
  .pay-per-item__inner{grid-template-columns:1fr;gap:40px}
  .plans{grid-template-columns:1fr;max-width:440px}
  .subscribe__inner{flex-direction:column;align-items:flex-start;gap:24px}
  .footer__inner{grid-template-columns:1fr 1fr;gap:32px}
  .list-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .list-grid{grid-template-columns:1fr}
  .detail__layout{grid-template-columns:1fr}
  .detail__sidebar{position:static}
  .member__grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:720px){
  .container{padding:0 18px}
  .nav,.header__actions .btn--text,.header__actions .btn--ghost{display:none}
  .header__burger{display:flex}
  .topbar__text{font-size:11.5px}
  .topbar__links{gap:6px}
  .hero{padding:40px 0 56px}
  .hero__title{font-size:38px}
  .hero__sub{font-size:15px}
  .hero__stats{gap:24px;flex-wrap:wrap}
  .hero__stat-num{font-size:22px}
  .hero__card--sub{position:static;width:auto;margin-top:16px}
  .section-title{font-size:26px}
  .grid{grid-template-columns:1fr}
  .tab{padding:10px 12px;font-size:13.5px}
  .footer__inner{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;gap:8px}
  .member__grid{grid-template-columns:1fr}
  .member__hero{padding:24px}
  .billing-toggle__save{display:none}
  .nav--open{display:flex;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:#fff;padding:12px 18px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-md)}
  .nav--open .nav__link{padding:12px 14px}
  .field--row{grid-template-columns:1fr}
}

/* ============ AI 工具板块 ============ */
.tools-page{padding:32px 0 80px}
.tools-feat{padding:56px 0}
.tools-feat .section-head{margin-bottom:24px}

.tools-search{display:flex;gap:8px;align-items:center}
.tools-search__input{padding:11px 18px;border:1px solid var(--border);border-radius:24px;background:var(--bg-card);color:var(--text);font-size:14px;min-width:260px;transition:.2s}
.tools-search__input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}

.tools-cats{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 36px}
.tools-cat{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:24px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-soft);font-size:13px;font-weight:500;cursor:pointer;transition:.18s}
.tools-cat:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.tools-cat--active{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 4px 14px var(--accent-soft)}
.tools-cat__num{font-size:11px;opacity:.75;background:rgba(0,0,0,.08);padding:1px 7px;border-radius:999px}
.tools-cat--active .tools-cat__num{background:rgba(255,255,255,.28);opacity:1}

.tools-group{margin-bottom:40px}
.tools-group__title{font-size:20px;font-weight:700;color:var(--text);margin:0 0 18px;display:flex;align-items:center;gap:12px;position:relative;padding-left:14px}
.tools-group__title::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:20px;background:linear-gradient(var(--accent),var(--accent-dark));border-radius:2px}
.tools-group__count{font-size:12px;font-weight:400;color:var(--text-faint);background:var(--bg-alt);padding:3px 10px;border-radius:999px}

.tools-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.tools-feat .tools-grid{grid-template-columns:repeat(4,1fr)}

.tool-card{display:flex;align-items:center;gap:14px;padding:18px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:14px;text-decoration:none;color:inherit;transition:.22s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}
.tool-card::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,var(--accent-soft),transparent 55%);opacity:0;transition:.22s}
.tool-card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:0 10px 28px rgba(0,0,0,.08)}
.tool-card:hover::before{opacity:.55}
.tool-card__icon{flex:none;width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,var(--accent-soft),var(--bg-alt));display:flex;align-items:center;justify-content:center;font-size:24px;position:relative;z-index:1;overflow:hidden}
.tool-card__img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-sizing:border-box}
.tool-card__fb{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:600;font-family:"Segoe UI Emoji","Apple Color Emoji","Noto Color Emoji",sans-serif}
.tool-card__main{flex:1;min-width:0;position:relative;z-index:1}
.tool-card__name{font-size:15px;font-weight:600;color:var(--text);margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tool-card__desc{font-size:12.5px;color:var(--text-faint);line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tool-card__go{flex:none;font-size:12px;color:var(--text-faint);font-weight:500;padding:5px 12px;border-radius:999px;background:var(--bg-alt);transition:.2s;position:relative;z-index:1;white-space:nowrap}
.tool-card:hover .tool-card__go{background:var(--accent);color:#fff}

@media (max-width:900px){
  .tools-grid,.tools-feat .tools-grid{grid-template-columns:repeat(2,1fr)}
  .tools-search{width:100%}
  .tools-search__input{flex:1;min-width:0}
}
@media (max-width:560px){
  .tools-grid,.tools-feat .tools-grid{grid-template-columns:1fr}
}