/* =========================================================
   AI时代政治学通识与企业治理线上研修班 · 官网样式
   配色：北大红（主色）/ 古金点缀 / 深蓝墨（暗区）/ 宣纸米白
   封面（Hero）背景：浅蓝渐变
   ========================================================= */
:root{
  --ink:        #15233f;   /* 深蓝墨（暗区底色） */
  --ink-2:      #1d3056;
  --ink-soft:   #2a3f63;
  --red:        #a81e2d;   /* 北大红（主色） */
  --red-bright: #c42335;
  --red-deep:   #7a1622;
  --gold:       #c2a35a;   /* 古金点缀 */
  --gold-light: #e3cd97;
  --primary:    #a81e2d;   /* = 北大红（保持变量兼容） */
  --primary-bright: #c42335;
  --primary-deep:   #7a1622;
  --accent:     #c2a35a;   /* = 古金（次强调） */
  --accent-light: #e3cd97;
  --cream:      #f6f1e7;   /* 宣纸米白 */
  --paper:      #ffffff;
  --muted:      #6b7385;
  --line:       #e4dccb;
  --line-ink:   rgba(255,255,255,.14);
  --shadow:     0 18px 50px -20px rgba(21,35,63,.45);
  --danger:     #e0533f;   /* 错误/危险红（保留语义） */
  --success:    #1f9d57;   /* 成功绿 */
  --radius:     16px;
  --maxw:       1160px;
  --serif:      "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans:       "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px;overflow-x:clip}
body{overflow-x:clip}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.25;font-weight:700}

/* ---------- 顶部公告条 ---------- */
.topbar{
  background:linear-gradient(90deg,var(--ink),var(--ink-2));
  color:#f3ecdb;
  font-size:13.5px;
  letter-spacing:.04em;
  text-align:center;
  padding:9px 16px;
  display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;
}
.topbar__dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(194,163,90,.25);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.topbar__link{color:var(--accent-light);font-weight:700}
.topbar__link:hover{text-decoration:underline}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s, background .3s;
}
.nav.is-stuck{box-shadow:0 8px 30px -18px rgba(21,35,63,.5)}
.nav__inner{
  max-width:var(--maxw);margin:0 auto;padding:12px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px}
.brand__logo{
  width:42px;height:42px;border-radius:50%;flex:none;background:#fff;padding:3px;
  border:1px solid var(--accent);box-shadow:0 6px 18px -10px rgba(0,0,0,.4);
}
.brand__seal{
  width:42px;height:42px;border-radius:10px;flex:none;
  background:linear-gradient(145deg,var(--primary),var(--primary-bright));
  color:#fff;font-family:var(--serif);font-weight:900;font-size:22px;
  display:grid;place-items:center;box-shadow:0 6px 18px -8px var(--primary);
}
.brand__text strong{display:block;font-family:var(--serif);font-size:17px;letter-spacing:.02em}
.brand__text em{display:block;font-style:normal;font-size:10px;letter-spacing:.18em;color:var(--muted)}
.nav__links{display:flex;align-items:center;gap:6px}
.nav__links a{padding:8px 13px;font-size:14.5px;color:var(--ink-soft);border-radius:9px;transition:.2s;position:relative}
.nav__links a:hover{color:var(--primary)}
.nav__links a.active{color:var(--primary);font-weight:700}
.nav__cta{
  background:var(--primary);color:#fff !important;font-weight:700;
  padding:9px 18px !important;border-radius:999px !important;
  box-shadow:0 10px 24px -12px var(--primary);
}
.nav__cta:hover{background:var(--primary-bright);transform:translateY(-1px)}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav__toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;color:#15233f}
.hero__bg{
  position:absolute;inset:0;
  background:
    radial-gradient(120% 90% at 80% -10%, rgba(31,111,235,.16), transparent 55%),
    radial-gradient(90% 80% at 10% 110%, rgba(47,155,214,.14), transparent 60%),
    linear-gradient(160deg,#eaf2fc 0%, #dbe9fb 45%, #cfe0f7 100%);
}
.hero__bg::after{
  content:"";position:absolute;inset:0;opacity:.6;
  background-image:
    repeating-linear-gradient(45deg, rgba(21,80,168,.05) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(-45deg, rgba(21,80,168,.05) 0 1px, transparent 1px 22px);
  mask-image:radial-gradient(80% 80% at 50% 30%, #000, transparent);
}
.hero__inner{position:relative;max-width:var(--maxw);margin:0 auto;padding:96px 22px 110px;text-align:center}
.hero__eyebrow{
  display:inline-block;font-size:14px;letter-spacing:.06em;color:#1450a8;
  border:1px solid rgba(21,80,168,.35);border-radius:999px;padding:6px 18px;margin-bottom:26px;
}
.hero__title{font-size:clamp(30px,5.2vw,56px);font-weight:900;letter-spacing:.01em}
.hero__tagline{margin:24px auto 0;max-width:680px;font-size:clamp(15px,2vw,19px);color:#3c465a;font-weight:300}
.hero__modes{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:28px}
.hero__mode{display:flex;align-items:center;gap:10px;padding:11px 20px;border-radius:999px;background:rgba(255,255,255,.6);border:1px solid rgba(21,80,168,.22);backdrop-filter:blur(4px);color:#15233f}
.hero__mode span{font-size:20px;line-height:1}
.hero__mode b{font-family:var(--serif);font-size:15px;font-weight:600}
.hero__stats{
  margin:46px auto 0;max-width:680px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
}
.stat{background:rgba(255,255,255,.6);border:1px solid rgba(21,80,168,.18);border-radius:14px;padding:18px 8px;backdrop-filter:blur(4px)}
.stat b{display:block;font-family:var(--serif);font-size:34px;color:var(--red);line-height:1}
.stat span{font-size:12.5px;color:#3c465a;letter-spacing:.02em}
.hero__actions{margin-top:42px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn-pop{position:relative;display:inline-flex}
.popover{
  position:absolute;bottom:calc(100% + 14px);top:auto;left:50%;transform:translate(-50%,8px);
  width:min(210px,calc(100vw - 40px));background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:16px;box-shadow:0 24px 50px -20px rgba(0,0,0,.35);
  display:flex;flex-direction:column;align-items:center;gap:10px;
  opacity:0;visibility:hidden;transition:.22s;z-index:60;
}
.popover::before{content:"";position:absolute;bottom:-7px;left:50%;transform:translateX(-50%) rotate(45deg);width:13px;height:13px;background:#fff;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.btn-pop:hover .popover,.popover.open{opacity:1;visibility:visible;transform:translate(-50%,0)}
.popover img{width:min(168px,calc(100vw - 80px));height:auto;border-radius:10px;background:#fff}
.popover em{font-style:normal;font-size:13px;color:var(--muted);text-align:center}

@media (max-width:480px){
  .popover{padding:14px}
  .popover em{font-size:12px}
}

.hero__scroll{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);width:26px;height:42px;border:2px solid rgba(21,80,168,.4);border-radius:20px;display:grid;place-items:start center;padding-top:7px}
.hero__scroll span{width:4px;height:8px;border-radius:4px;background:var(--red);animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:0;transform:translateY(-4px)}40%{opacity:1}100%{opacity:0;transform:translateY(12px)}}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:15px;font-weight:700;padding:13px 28px;border-radius:999px;cursor:pointer;border:1.5px solid transparent;transition:.22s;font-family:var(--sans)}
.btn--primary{background:var(--primary);color:#fff;box-shadow:0 14px 30px -14px var(--primary)}
.btn--primary:hover{background:var(--primary-bright);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:#15233f;border-color:rgba(21,80,168,.4)}
.btn--ghost:hover{background:rgba(21,80,168,.08);border-color:rgba(21,80,168,.55)}
.btn--block{width:100%;margin-top:6px}

/* ---------- 通用 section ---------- */
.section{padding:84px 0}
.section--paper{background:var(--paper)}
.section--cream{background:var(--cream)}
.section--ink{background:linear-gradient(160deg,#eaf2fc 0%, #dbe9fb 45%, #cfe0f7 100%);color:#15233f}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.container--narrow{max-width:760px}

.section__head{max-width:760px;margin:0 auto 52px;text-align:center}
.section__kicker{display:block;font-size:12.5px;letter-spacing:.32em;color:var(--primary);font-weight:700;margin-bottom:12px}
.section__head--light .section__kicker{color:var(--accent-light)}
.section__title{font-size:clamp(24px,3.4vw,36px);position:relative;display:inline-block;padding-bottom:14px}
.section__title::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:54px;height:3px;background:var(--accent);border-radius:3px}
.section__lead{margin-top:18px;color:var(--muted);font-size:16px;font-weight:300}
.section--ink .section__lead{color:var(--muted)}
.section--ink .section__title::after{background:var(--gold)}

/* ---------- 关于 ---------- */
.about__grid{display:grid;grid-template-columns:1.3fr 1fr;gap:46px;align-items:start}
.about__intro h3{font-size:22px;margin-bottom:16px;color:var(--ink)}
.about__intro p{margin-bottom:14px;color:#3c465a}
.about__intro strong{color:var(--primary)}
.about__intro em{font-style:normal;color:var(--accent);font-weight:600;font-family:var(--serif)}
.about__pillars{list-style:none;display:flex;flex-direction:column;gap:16px}
.pillar{display:flex;gap:16px;background:var(--cream);border:1px solid var(--line);border-radius:14px;padding:20px;transition:.25s}
.pillar:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--accent)}
.pillar__icon{font-size:26px;color:var(--primary);line-height:1.4;flex:none;width:30px;text-align:center}
.pillar h4{font-size:17px;margin-bottom:4px}
.pillar p{font-size:14px;color:var(--muted);line-height:1.6}

/* ---------- 四大优势 ---------- */
.adv__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.adv{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;position:relative;overflow:hidden;transition:.28s}
.adv::before{content:"";position:absolute;inset:0;background:radial-gradient(120% 80% at 100% 0, rgba(194,163,90,.18), transparent 60%);opacity:0;transition:.28s}
.adv:hover{transform:translateY(-6px);border-color:rgba(227,205,151,.5)}
.adv:hover::before{opacity:1}
.adv__tag{display:inline-block;font-family:var(--serif);font-size:13px;font-weight:700;color:var(--gold);border:1px solid rgba(194,163,90,.45);border-radius:6px;padding:3px 12px;margin-bottom:16px;letter-spacing:.1em}
.adv__title{font-size:19px;color:var(--ink);margin-bottom:12px}
.adv p{font-size:14px;color:var(--muted);line-height:1.7}

/* ---------- 时间轴 ---------- */
.timeline{position:relative;max-width:880px;margin:0 auto;padding-left:8px}
.timeline::before{content:"";position:absolute;left:100px;top:10px;bottom:10px;width:2px;background:linear-gradient(var(--accent),var(--line))}
.tl{position:relative;display:grid;grid-template-columns:92px 1fr;gap:24px;padding:14px 0}
.tl__day{font-family:var(--serif);font-weight:900;font-size:20px;color:var(--primary);text-align:right;padding-top:6px;padding-right:18px}
.tl__body{background:var(--cream);border:1px solid var(--line);border-radius:14px;padding:22px 24px;position:relative;transition:.25s}
.tl__body:hover{box-shadow:var(--shadow);transform:translateX(4px)}
.tl__body::before{content:"";position:absolute;left:-36px;top:24px;width:16px;height:16px;border-radius:50%;background:var(--accent);border:4px solid var(--paper);box-shadow:0 0 0 2px var(--accent)}
.tl__body h3{font-size:19px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tl__mode{font-family:var(--sans);font-size:12px;font-weight:700;color:#fff;background:var(--ink-soft);padding:3px 10px;border-radius:999px}
.tl__body p{color:#3c465a;margin:10px 0 14px;font-size:14.5px}
.tl__topics{display:flex;flex-wrap:wrap;gap:8px}
.tl__topics span{font-size:12.5px;color:var(--ink-soft);background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 12px}

/* ---------- 智识体图书 ---------- */
.book__grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:stretch}
.book__showcase{display:flex;flex-direction:column}
.book__cover{display:flex;justify-content:center;padding:8px 0 4px}
.book__cover img{width:min(290px,72%);height:auto;border-radius:10px;box-shadow:0 24px 48px rgba(92,14,24,.28),0 4px 12px rgba(0,0,0,.12)}
.book__intro{margin-top:20px}
.book__intro p{font-size:14px;color:#3c465a;line-height:1.8;margin-bottom:14px}
.book__intro p strong{color:var(--primary)}
.book__tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.book__tags span{font-size:12.5px;color:var(--ink-soft);background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 13px;font-weight:500}
.book__tags span::before{content:"✦";color:var(--accent);font-weight:700;margin-right:6px}

.book__entries{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 28px;box-shadow:var(--shadow);height:100%;display:flex;flex-direction:column;justify-content:center}
.book__entries h3{font-family:var(--serif);font-size:21px;margin-bottom:6px;color:var(--ink-soft)}
.book__entries-sub{font-size:13.5px;color:var(--muted);margin-bottom:22px}
.entry{display:flex;align-items:center;gap:16px;padding:18px;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;text-decoration:none;color:inherit;transition:.22s;background:var(--paper)}
.entry:last-child{margin-bottom:0}
.entry:hover{border-color:var(--primary);transform:translateX(4px);box-shadow:var(--shadow)}
.entry__icon{font-size:24px;width:50px;height:50px;flex:0 0 auto;display:grid;place-items:center;border-radius:12px;background:#fff;border:1px solid var(--line)}
.entry__txt{display:flex;flex-direction:column;gap:3px;flex:1;min-width:0}
.entry__txt b{font-size:16.5px;font-family:var(--serif)}
.entry__txt i{font-size:13px;color:var(--muted);font-style:normal}
.entry__arrow{font-size:20px;color:var(--primary);flex:0 0 auto;font-weight:700}

/* ---------- 学习收获 ---------- */
.gain__grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.gain{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:26px 20px;transition:.25s;position:relative}
.gain:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--accent)}
.gain__no{font-family:var(--serif);font-size:30px;font-weight:900;color:var(--accent);display:block;margin-bottom:10px}
.gain h3{font-size:16.5px;margin-bottom:10px;line-height:1.4}
.gain p{font-size:13.5px;color:var(--muted);line-height:1.65}

/* ---------- 招生对象 ---------- */
.aud__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.aud{text-align:center;background:var(--cream);border:1px solid var(--line);border-radius:var(--radius);padding:34px 22px;transition:.25s}
.aud:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--accent)}
.aud__emoji{font-size:40px;margin-bottom:14px}
.aud h3{font-size:18px;margin-bottom:8px}
.aud p{font-size:14px;color:var(--muted)}

/* ---------- 报名信息 ---------- */
.info__grid{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:start}
.info__facts{display:flex;flex-direction:column;gap:2px}
.fact{display:flex;flex-direction:column;gap:4px;padding:16px 4px;border-bottom:1px solid var(--line)}
.fact span{font-size:12.5px;letter-spacing:.1em;color:var(--gold);text-transform:uppercase}
.fact b{font-size:16.5px;color:var(--ink);font-weight:500}
.fact__price{color:var(--gold) !important;font-size:22px !important;font-family:var(--serif);font-weight:700 !important}
.fact i{font-style:normal;font-size:13px;color:var(--muted)}
.info__flow{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.info__flow h3{font-size:20px;color:var(--ink);margin-bottom:20px}
.flow{list-style:none;display:flex;flex-direction:column;gap:20px}
.flow li{display:flex;gap:16px;align-items:flex-start}
.flow__step{flex:none;width:34px;height:34px;border-radius:50%;background:var(--gold);color:#fff;font-weight:900;font-family:var(--serif);display:grid;place-items:center}
.flow b{color:var(--ink);font-size:15.5px}
.flow p{font-size:13.5px;color:var(--muted);margin-top:2px}

/* ---------- 报名表单 ---------- */
.form{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px}
.field{display:flex;flex-direction:column;margin-bottom:18px}
.field:last-of-type{margin-bottom:8px}
.field label{font-size:14px;font-weight:500;margin-bottom:7px;color:var(--ink-soft)}
.field label i{color:var(--danger);font-style:normal}
.field input,.field select,.field textarea{
  font-family:var(--sans);font-size:15px;color:var(--ink);
  border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;background:#fcfaf5;transition:.2s;width:100%;
}
.field textarea{resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--gold);background:#fff;box-shadow:0 0 0 3px rgba(168,30,45,.14)}
.field.is-invalid input,.field.is-invalid select{border-color:var(--danger);background:#fff5f5}
.field__err{color:var(--danger);font-size:12.5px;min-height:0;margin-top:5px;display:block}
.form__agree{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--muted);margin:6px 0 4px;cursor:pointer}
.form__agree input{margin-top:4px;width:16px;height:16px;accent-color:var(--primary);flex:none}
.form__hint{text-align:center;font-size:13px;color:var(--muted);margin-top:14px}

/* ---------- APP 下载 ---------- */
.app__grid{display:grid;grid-template-columns:auto 1fr;gap:50px;align-items:center;max-width:900px;margin:0 auto}
.app__qr{display:flex;gap:22px}
.qr{display:flex;flex-direction:column;align-items:center;gap:10px}
.qr img{width:148px;height:148px;border:8px solid #fff;border-radius:14px;box-shadow:var(--shadow);background:#fff}
.qr span{font-size:13.5px;color:var(--muted);font-weight:500}
.app__cta h3{font-size:24px;margin-bottom:14px}
.app__cta p{color:#3c465a;font-size:15.5px;margin-bottom:22px}
.app__cta strong{color:var(--primary)}
.app__btns{display:flex;gap:14px;flex-wrap:wrap}
.store{display:inline-flex;align-items:center;gap:11px;background:var(--ink);color:#fff;border-radius:12px;padding:12px 22px;transition:.22s;min-width:188px}
.store:hover{background:var(--ink-2);transform:translateY(-2px)}
.store__icon{font-size:24px}
.store__txt{display:flex;flex-direction:column;line-height:1.15;text-align:left}
.store__txt i{font-style:normal;font-size:11px;color:#aeb8c9}
.store__txt b{font-size:17px;font-family:var(--serif)}
.app__note{font-size:12.5px;color:var(--muted);margin-top:16px !important}

/* ---------- 页脚 ---------- */
.footer{background:linear-gradient(160deg,#0b1424,#15233f);color:#c8d2e2;padding:54px 0 40px}
.footer__inner{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:36px;align-items:start}
.footer__brand{display:flex;gap:14px;align-items:flex-start}
.footer__brand .brand__logo{width:48px;height:48px}
.footer__brand strong{font-family:var(--serif);font-size:18px;color:#fff}
.footer__brand p{font-size:13.5px;color:#9fabc2;margin-top:4px}
.footer__meta p,.footer__copy p{font-size:14px;color:#aeb8c9;margin-bottom:6px}
.footer__copy strong{color:#fff}
.footer__copy p:first-child{color:#fff;font-family:var(--serif)}

/* ---------- 回到顶部 ---------- */
.to-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;border:0;background:var(--primary);color:#fff;font-size:20px;cursor:pointer;box-shadow:0 12px 28px -10px var(--primary);opacity:0;transform:translateY(14px);pointer-events:none;transition:.3s;z-index:70}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--primary-bright)}

/* ---------- Toast ---------- */
.toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,140%);background:var(--ink);color:#fff;padding:15px 26px;border-radius:12px;font-size:14.5px;box-shadow:var(--shadow);z-index:90;transition:.4s;max-width:90vw;text-align:center;border:1px solid var(--line-ink)}
.toast.show{transform:translate(-50%,0)}
.toast b{color:var(--accent-light)}

/* ---------- 登录弹窗 ---------- */
.modal{position:fixed;inset:0;box-sizing:border-box;z-index:200;display:none;align-items:center;justify-content:center;padding:20px;overflow-y:auto}
.modal.open{display:flex}
.modal__overlay{position:absolute;inset:0;background:rgba(15,18,28,.62);backdrop-filter:blur(4px)}
.modal__card{position:relative;width:100%;max-width:400px;box-sizing:border-box;background:#fff;border-radius:18px;padding:34px 30px 26px;box-shadow:0 40px 80px -30px rgba(0,0,0,.6);border-top:4px solid var(--primary);animation:modalIn .26s ease}
@keyframes modalIn{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.modal__close{position:absolute;top:12px;right:14px;width:32px;height:32px;border:0;background:transparent;font-size:24px;line-height:1;color:var(--muted);cursor:pointer;border-radius:8px;transition:.2s}
.modal__close:hover{background:var(--paper);color:var(--ink)}
.modal__logo{width:46px;height:46px;border-radius:50%;display:block;margin:0 auto 14px;object-fit:cover}
.modal__title{text-align:center;font-family:var(--serif);font-size:22px;color:var(--ink-soft);margin-bottom:6px}
.modal__sub{text-align:center;font-size:13px;color:var(--muted);line-height:1.6;margin-bottom:22px;padding:0 6px}
.lform{display:flex;flex-direction:column;gap:16px}
.lfield{display:flex;flex-direction:column;gap:6px}
.lfield span{font-size:13px;color:var(--ink-soft);font-weight:500}
.lfield input{width:100%;height:44px;border:1px solid var(--line);border-radius:10px;padding:0 14px;font-size:15px;font-family:inherit;transition:.2s;background:#fff;color:var(--ink);box-sizing:border-box}
.lfield input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(140,26,40,.12)}
.lfield__pw{position:relative;display:flex}
.lfield__pw input{padding-right:46px}
.lfield__eye{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:34px;height:34px;display:grid;place-items:center;border:0;background:transparent;color:var(--muted);cursor:pointer;border-radius:8px;transition:.18s}
.lfield__eye:hover{background:var(--paper);color:var(--primary)}
.lfield__eye .eye-off{display:none}
.lfield__eye.is-on .eye-open{display:none}
.lfield__eye.is-on .eye-off{display:block}
.lform__row{display:flex;align-items:center;justify-content:space-between;margin-top:-4px}
.lform__remember{display:flex;align-items:center;gap:7px;cursor:pointer;font-size:13px;color:var(--ink-soft);user-select:none}
.lform__remember input{width:15px;height:15px;accent-color:var(--primary);cursor:pointer}
.lform__forgot{border:0;background:none;padding:0;color:var(--primary);font-size:13px;cursor:pointer;font-family:inherit;transition:.18s}
.lform__forgot:hover{text-decoration:underline;color:var(--primary-bright)}
.lform__err{color:var(--danger);font-size:13px;margin:-4px 0 0;display:none}
.lform__err.show{display:block}
.lform__note{color:#1c7a4a;background:#eafaf1;border:1px solid #bfe8cf;border-radius:8px;font-size:12.5px;line-height:1.55;margin:-2px 0 0;padding:9px 12px;display:none}
.lform__note.show{display:block}
#loginSubmit{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px}
#loginSubmit .btn__spinner{display:none;width:16px;height:16px;border-radius:50%;border:2px solid rgba(255,255,255,.45);border-top-color:#fff;animation:btnSpin .7s linear infinite}
#loginSubmit.is-loading{pointer-events:none;opacity:.85}
#loginSubmit.is-loading .btn__spinner{display:inline-block}
@keyframes btnSpin{to{transform:rotate(360deg)}}
.modal__hint{margin-top:16px;font-size:12px;color:var(--muted);text-align:center;line-height:1.5}

/* ---------- 滚动揭示 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease, transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .adv__grid{grid-template-columns:repeat(2,1fr)}
  .gain__grid{grid-template-columns:repeat(2,1fr)}
  .aud__grid{grid-template-columns:repeat(2,1fr)}
  .about__grid,.info__grid{grid-template-columns:1fr;gap:30px}
  .book__grid{grid-template-columns:1fr;gap:34px}
  .app__grid{grid-template-columns:1fr;justify-items:center;text-align:center}
  .app__cta{text-align:center}
  .footer__inner{grid-template-columns:1fr;gap:24px}
}
@media (max-width:760px){
  .nav__links{
    position:fixed;top:0;right:0;height:100vh;width:78%;max-width:320px;
    background:var(--paper);flex-direction:column;align-items:stretch;gap:0;
    padding:84px 20px 30px;box-shadow:-20px 0 60px -30px rgba(0,0,0,.5);
    transform:translateX(100%);transition:transform .3s;z-index:55;
  }
  .nav__links.open{transform:none}
  .nav__links a{padding:14px 8px;border-bottom:1px solid var(--line);border-radius:0}
  .nav__cta{margin-top:14px;text-align:center}
  .nav__toggle{display:flex;z-index:60}
  .nav__toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav__toggle.open span:nth-child(2){opacity:0}
  .nav__toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .hero__stats{grid-template-columns:repeat(2,1fr);gap:10px}
  .form{padding:24px 18px}
  .form__row{grid-template-columns:1fr;gap:0}
  .section{padding:62px 0}
  .user-center{width:100%;margin-top:8px}
  .user-center__toggle{width:100%;justify-content:space-between}
  .user-center__dropdown{
    position:static;width:100%;transform:none;opacity:1;visibility:visible;
    display:none;margin-top:10px;box-shadow:none;border:1px solid var(--line);
    background:var(--cream);padding:16px;
  }
  .user-center__dropdown.open{display:block}
  .user-center__dropdown::before{display:none}
  .user-center__name{max-width:none}
}
@media (max-width:480px){
  .adv__grid,.gain__grid,.aud__grid{grid-template-columns:1fr}
  .app__qr{flex-direction:column}
  .hero__inner{padding:70px 18px 90px}
}

/* ---------- 个人中心（导航栏右上角） ---------- */
.user-center{position:relative;flex:none}
.user-center__toggle{
  display:inline-flex;align-items:center;gap:7px;
  background:var(--ink);color:#fff;font-size:14px;font-weight:600;
  padding:9px 15px;border-radius:999px;border:0;cursor:pointer;
  box-shadow:0 10px 24px -12px rgba(21,35,63,.35);transition:.2s;
}
.user-center__toggle:hover{background:var(--ink-2)}
.user-center__toggle[aria-expanded="true"] .user-center__arrow{transform:rotate(180deg)}
.user-center__avatar{
  width:24px;height:24px;border-radius:50%;background:rgba(255,255,255,.18);
  display:grid;place-items:center;font-size:13px;flex:none;
}
.user-center__name{max-width:110px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-center__arrow{font-size:10px;color:var(--accent-light);transition:transform .2s;flex:none;margin-left:2px}

.user-center__dropdown{
  position:absolute;top:calc(100% + 10px);right:0;width:min(280px,calc(100vw - 24px));
  background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:18px;box-shadow:0 24px 50px -20px rgba(0,0,0,.35);
  opacity:0;visibility:hidden;transform:translateY(-6px);transition:.2s;z-index:70;
}
.user-center__dropdown.open{opacity:1;visibility:visible;transform:none}
.user-center__dropdown::before{
  content:"";position:absolute;top:-7px;right:22px;transform:rotate(45deg);
  width:13px;height:13px;background:#fff;border-left:1px solid var(--line);border-top:1px solid var(--line);
}
.user-center__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.user-center__role{font-size:12px;color:var(--muted);font-weight:500}
.user-center__badge{font-size:11.5px;padding:3px 10px;border-radius:999px;font-weight:600}
.user-center__badge.is-open{background:rgba(120,190,120,.12);color:#2a8a2a;border:1px solid rgba(120,190,120,.35)}
.user-center__badge.is-wait{background:rgba(194,163,90,.16);color:#8a6d2f;border:1px solid rgba(194,163,90,.35)}
.user-center__cohort{font-family:var(--serif);font-size:19px;font-weight:700;color:var(--ink);margin-bottom:10px;line-height:1.25}
.user-center__progress{height:7px;border-radius:999px;background:#e8e4dc;overflow:hidden;margin-bottom:8px}
.user-center__progress span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--accent-light));transition:width .6s}
.user-center__meta{font-size:12.5px;color:var(--muted);margin-bottom:14px;line-height:1.55}
.user-center__actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}
.user-center__actions .btn{font-size:13px;padding:9px 10px;border-radius:10px;width:100%}
.user-center__actions .btn--ghost{color:var(--ink-soft);border-color:var(--line);background:#faf9f6}
.user-center__actions .btn--ghost:hover{background:var(--cream);border-color:var(--accent)}
.user-center__logout{
  width:100%;text-align:center;background:none;border:0;padding:8px 0;
  font-size:13px;color:var(--muted);cursor:pointer;border-radius:8px;transition:.18s;
}
.user-center__logout:hover{color:var(--primary);background:#faf5f5}