:root{
  --ink:#14181d;
  --ink2:#39424d;
  --muted:#6d7683;
  --line:#e6e1d8;
  --line2:#efeae2;
  --bg:#faf8f4;
  --card:#ffffff;
  --brand:#1f4d3a;
  --brand2:#2e6b52;
  --accent:#c4552d;
  --radius:14px;
  --max:1080px;
  --shadow:0 1px 2px rgba(20,24,29,.04),0 8px 24px rgba(20,24,29,.05);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  max-width:100%;
  overflow-x:hidden;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit}
.container{max-width:var(--max);margin:0 auto;padding:0 22px}
.mono{font-variant-numeric:tabular-nums}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(250,248,244,.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--line2)}
.nav-in{display:flex;align-items:center;gap:24px;height:62px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;letter-spacing:.02em;white-space:nowrap}
.brand .dot{width:9px;height:9px;border-radius:3px;background:var(--brand);transform:rotate(45deg);flex:none}
.brand small{font-weight:500;color:var(--muted);font-size:12px;letter-spacing:.08em}
.nav-links{display:flex;gap:22px;margin-left:auto;font-size:14.5px;color:var(--ink2)}
.nav-links a{position:relative;padding:4px 0;white-space:nowrap}
.nav-links a:hover{color:var(--brand)}
.nav-links a.on{color:var(--brand);font-weight:600}
.nav-links a.on:after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--brand);border-radius:2px}
.nav-cta{margin-left:8px;background:var(--brand);color:#fff;padding:8px 16px;border-radius:999px;font-size:14px;font-weight:600;white-space:nowrap}
.nav-cta:hover{background:var(--brand2)}

/* hero */
.hero{
  background:
    radial-gradient(900px 420px at 78% -10%,rgba(90,66,220,.34),transparent 62%),
    radial-gradient(700px 380px at 8% 108%,rgba(28,110,180,.20),transparent 60%),
    linear-gradient(168deg,#0c1016 0%,#121a26 58%,#182233 100%);
  color:#fff;position:relative;overflow:hidden;
}
.hero:before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:44px 44px;
}
.hero-in{position:relative;padding-top:76px;padding-bottom:84px}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.14em;color:#9aa6b8;border:1px solid rgba(255,255,255,.16);border-radius:999px;padding:6px 13px}
.kicker i{width:5px;height:5px;border-radius:50%;background:#7c5cff;display:block}
.hero h1{font-size:clamp(32px,5.6vw,58px);line-height:1.16;margin:26px 0 0;font-weight:900;letter-spacing:.01em;word-break:break-word}
.hero h1 .g{background:linear-gradient(92deg,#8f7bff,#5fb3ff 60%,#6de3c4);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{margin:22px 0 0;font-size:clamp(15px,2.1vw,17.5px);color:#b7c1d1;max-width:660px;line-height:1.85}
.hero .punch{
  margin:16px 0 0;font-size:clamp(19px,2.7vw,23px);font-weight:900;
  color:#ff7a59;letter-spacing:.06em;display:flex;align-items:center;gap:12px;
}
.hero .punch:before{content:"";width:28px;height:3px;background:#ff7a59;border-radius:2px;flex:none}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-meta span{font-size:13px;color:#c8d2e2;border:1px solid rgba(255,255,255,.14);padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.03)}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:34px}
.hero-in.solo{padding-top:70px}
.hero-in.solo p.lead{margin-top:20px;font-size:clamp(19px,2.6vw,24px);color:#c8d2e0;line-height:1.8;max-width:720px}
.hero-in.solo .punch{font-size:clamp(25px,3.6vw,34px);margin-top:22px}
.hero-in.solo .hero-meta{margin-top:30px}
.hero-in.solo .hero-actions{margin-top:32px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:12px;font-weight:700;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.16s ease}
.btn-primary{background:linear-gradient(180deg,#2a6b52,#1f4d3a);color:#fff;box-shadow:0 8px 22px rgba(31,77,58,.28)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 28px rgba(31,77,58,.34)}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border-color:rgba(255,255,255,.2)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.price-tag{display:flex;align-items:baseline;gap:6px;color:#e9eef7}
.price-tag b{font-size:30px;font-weight:900;letter-spacing:-.02em}
.price-tag span{font-size:13px;color:#8e9aad}

/* sections */
section.block{padding:62px 0}
.sec-head{display:grid;grid-template-columns:auto minmax(0,1fr);gap:3px 16px;align-items:baseline;margin-bottom:30px}
.sec-no{grid-row:1 / span 2;align-self:start;padding-top:13px;font-size:12px;letter-spacing:.18em;color:var(--accent);font-weight:800;white-space:nowrap}
.sec-head h2{grid-column:2;font-size:clamp(22px,3.4vw,30px);margin:0;font-weight:850;letter-spacing:.01em}
.sec-head p{grid-column:2;margin:0;color:var(--muted);font-size:14.5px;max-width:620px;line-height:1.65}

/* cases */
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.case{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);transition:.18s ease;display:flex;flex-direction:column;gap:8px}
.case:hover{transform:translateY(-2px);border-color:#cfd8cf}
.case .tag{font-size:11.5px;letter-spacing:.08em;color:var(--brand);background:#eef4ee;border-radius:999px;padding:3px 9px;align-self:flex-start}
.case h3{margin:2px 0 0;font-size:17px}
.case p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.7}
.case .go{margin-top:auto;font-size:13px;color:var(--brand);font-weight:700}

/* outline */
.outline{display:flex;flex-direction:column;gap:12px}
.mod{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.mod summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:16px;padding:18px 20px}
.mod summary::-webkit-details-marker{display:none}
.mod summary:hover{background:#fcfbf8}
.mod .no{font-size:13px;font-weight:900;color:var(--brand);letter-spacing:.06em;min-width:30px;font-variant-numeric:tabular-nums;flex:none}
.mod summary > span:nth-child(2){display:flex;flex-direction:column;gap:3px;min-width:0}
.mod .t{font-weight:750;font-size:16.5px;display:block}
.mod .s{color:var(--muted);font-size:13.5px;display:block;line-height:1.5}
.mod .count{margin-left:auto;font-size:12.5px;color:var(--muted);white-space:nowrap;flex:none}
.mod .arrow{color:var(--muted);transition:.2s;font-size:12px;flex:none}
.mod[open] .arrow{transform:rotate(90deg)}
.lessons{border-top:1px solid var(--line2);padding:6px 0}
.lesson{display:flex;align-items:center;gap:12px;padding:11px 20px 11px 66px;font-size:14.5px;color:var(--ink2);border-bottom:1px solid #f6f3ee}
.lesson:last-child{border-bottom:0}
.lesson:hover{background:#fcfbf8}
.lesson .n{color:var(--muted);font-size:12.5px;min-width:34px;flex:none;font-variant-numeric:tabular-nums}
.lesson .ln{flex:1;min-width:0}
.lesson .d{color:var(--muted);font-size:12.5px;min-width:44px;text-align:right;flex:none}
.badge{font-size:11px;padding:2px 8px;border-radius:999px;font-weight:700;flex:none}
.badge.free{background:#eaf4ee;color:var(--brand)}
.badge.lock{background:#f2f0ec;color:#8b8578}

/* audience + faq */
.two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.panel h3{margin:0 0 14px;font-size:16px}
.panel ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:10px}
.panel li{position:relative;padding-left:24px;font-size:14.5px;color:var(--ink2);line-height:1.7}
.panel li:before{content:"";position:absolute;left:4px;top:10px;width:7px;height:7px;border-radius:50%}
.panel.yes li:before{background:var(--brand)}
.panel.no li:before{background:#c9c2b6}
.panel.no li{color:var(--muted)}

.faq{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:16px 2px}
.faq summary{cursor:pointer;list-style:none;font-weight:700;font-size:15.5px;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--muted);font-weight:400}
.faq details[open] summary:after{content:"-"}
.faq p{margin:10px 0 0;color:var(--ink2);font-size:14.5px}

/* cta */
.cta{background:linear-gradient(140deg,#12241c,#1f4d3a 60%,#2b6049);border-radius:20px;color:#fff;padding:40px;display:flex;align-items:center;gap:28px;flex-wrap:wrap}
.cta h2{margin:0;font-size:clamp(20px,3vw,27px);font-weight:850}
.cta p{margin:8px 0 0;color:#c9ded3;font-size:14.5px}
.cta .right{margin-left:auto;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.cta .btn-primary{background:#fff;color:var(--brand);box-shadow:none}
.cta .btn-primary:hover{background:#f2f7f3}

/* footer */
footer{border-top:1px solid var(--line);padding:34px 0 46px;color:var(--muted);font-size:13px}
.foot-in{display:flex;gap:18px;flex-wrap:wrap;align-items:center;justify-content:space-between}
.foot-in a:hover{color:var(--brand)}

/* page head */
.page-head{padding:44px 0 8px}
.page-head .crumb{font-size:13px;color:var(--muted)}
.page-head h1{font-size:clamp(24px,4vw,34px);margin:10px 0 0;font-weight:850}
.page-head p{margin:10px 0 0;color:var(--muted);font-size:14.5px;max-width:640px}

/* player */
.play-wrap{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:22px;padding:26px 0 70px;align-items:start}
.stage{background:#0b0f14;border-radius:16px;overflow:hidden;border:1px solid #1e2833}
.stage .screen{aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:#7d8b9c;position:relative;background:radial-gradient(500px 260px at 50% 0%,rgba(96,72,220,.16),transparent 70%),repeating-linear-gradient(45deg,#0b0f14,#0b0f14 12px,#0d1218 12px,#0d1218 24px)}
.stage .screen .playbtn{width:64px;height:64px;border-radius:50%;border:1px solid rgba(255,255,255,.22);display:flex;align-items:center;justify-content:center;color:#cfd8e6;font-size:20px;background:rgba(255,255,255,.05)}
.stage .screen .hint{font-size:13px;letter-spacing:.06em}
.stage .bar{display:flex;align-items:center;gap:10px;padding:12px 16px;border-top:1px solid #1a2531;color:#8b98a8;font-size:12.5px}
.stage .bar .track{flex:1;height:4px;background:#1c2733;border-radius:99px;overflow:hidden}
.stage .bar .track i{display:block;height:100%;width:0%;background:#3f8f6c}
.stage-info{padding:18px 2px}
.stage-info h2{margin:0;font-size:21px}
.stage-info .meta{color:var(--muted);font-size:13px;margin-top:6px}
.stage-info .desc{margin-top:12px;color:var(--ink2);font-size:14.5px}

.side{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}
.side h3{margin:0;padding:15px 18px;font-size:14px;border-bottom:1px solid var(--line2);color:var(--ink2)}
.side .slist{max-height:560px;overflow:auto}
.side .sitem{display:flex;gap:10px;padding:11px 16px;font-size:13.5px;border-bottom:1px solid #f7f4ef;color:var(--ink2)}
.side .sitem:hover{background:#fcfbf8}
.side .sitem.on{background:#f1f6f2;color:var(--brand);font-weight:700}
.side .sitem .n{color:var(--muted);font-size:12px;min-width:26px;flex:none}
.side .sitem.locked{color:#9a9488}

/* activate */
.activate-card{max-width:520px;margin:40px auto 80px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow)}
.activate-card h2{margin:0 0 6px;font-size:22px}
.activate-card p.sub{margin:0 0 24px;color:var(--muted);font-size:14px}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.field label{font-size:13px;color:var(--ink2);font-weight:600}
.field input{border:1px solid var(--line);border-radius:11px;padding:13px 14px;font-size:16px;background:#fdfcfa;letter-spacing:.14em;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;width:100%}
.field input:focus{outline:2px solid #cfe0d6;border-color:var(--brand)}
.note{background:#fbf7ef;border:1px solid #ece2cf;border-radius:12px;padding:14px 16px;font-size:13px;color:#7a6a4f;line-height:1.7;margin-top:18px}

.buybox{display:flex;align-items:center;gap:16px;margin-top:22px;padding-top:20px;border-top:1px solid var(--line2);flex-wrap:wrap}
.bb-l{min-width:0}
.bb-p{font-size:26px;font-weight:900;color:var(--accent);letter-spacing:-.02em;line-height:1.2}
.bb-n{font-size:12.5px;color:var(--muted);margin-top:2px}
.bb-btn{margin-left:auto;padding:11px 20px;font-size:14px;background:#eef4ee;border-color:#d3e2d8;color:var(--brand);font-weight:800}
.bb-btn:hover{background:#e3eee7;border-color:#bcd2c4}
.bb-soon{margin-left:auto;font-size:12.5px;color:var(--muted);text-align:right;line-height:1.6;max-width:200px}

/* empty */
.empty{max-width:560px;margin:70px auto 110px;text-align:center}
.empty .ico{width:64px;height:64px;border-radius:18px;margin:0 auto 20px;background:#f1efe9;display:flex;align-items:center;justify-content:center;font-size:26px}
.empty h2{margin:0 0 10px;font-size:22px}
.empty p{color:var(--muted);font-size:14.5px;margin:0 0 22px}

/* responsive */
@media (max-width:900px){
  .play-wrap{grid-template-columns:minmax(0,1fr)}
  .side .slist{max-height:none}
  .cases{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .nav-in{height:56px;gap:12px}
  .nav-links{display:none}
  .brand small{display:none}
  .hero-in{padding-top:52px;padding-bottom:58px}
  section.block{padding:44px 0}
  .cases{grid-template-columns:1fr}
  .two{grid-template-columns:1fr}
  .cta{padding:26px;border-radius:16px}
  .cta .right{margin-left:0;width:100%}
  .lesson{padding-left:20px}
  .mod .s{display:none}
  .activate-card{padding:24px;margin:24px auto 60px}
  .foot-in{flex-direction:column;align-items:flex-start;gap:8px}
  .sec-head{gap:2px 10px}
  .sec-no{padding-top:10px;font-size:11px;letter-spacing:.12em}
  .hero-actions{gap:10px}
  .price-tag b{font-size:26px}
}

/* ============ 多分区版新增样式 ============ */

/* 顶栏用户区 */
.nav-user{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink2);margin-left:auto}
.nav-user a{color:var(--brand);font-weight:600}
.nav-user .u-name{color:var(--muted);font-size:13px}

/* 分区卡片 */
.sec-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.sec-card{display:flex;flex-direction:column;gap:10px;padding:22px;background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);transition:.18s ease}
.sec-card:hover{transform:translateY(-3px);border-color:#cfd8cf}
.sc-top{display:flex;justify-content:space-between;align-items:center}
.sc-no{font-size:12px;font-weight:900;color:var(--accent);letter-spacing:.14em}
.sc-count{font-size:12px;color:var(--muted)}
.sec-card h3{margin:2px 0 0;font-size:19px;font-weight:800;line-height:1.4}
.sec-card p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.7;flex:1}
.sc-foot{display:flex;justify-content:space-between;align-items:center;padding-top:12px;border-top:1px solid var(--line2);font-size:12.5px;color:var(--brand);font-weight:700}
.sc-go{color:var(--brand)}

/* 分区页 */
.section-lock{background:#fbf7ef;border:1px solid #ece2cf;border-radius:14px;padding:16px 18px;margin:20px 0}
.sl-in{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.sl-ico{font-size:20px}
.sl-in b{font-size:15px}
.sl-in p{margin:4px 0 0;font-size:13px;color:#7a6a4f;line-height:1.6}
.sl-in .btn{margin-left:auto}

.video-list{display:flex;flex-direction:column;gap:10px;padding:6px 0 70px}
.video-row{display:flex;align-items:center;gap:16px;padding:16px 20px;background:var(--card);border:1px solid var(--line);border-radius:14px;transition:.15s}
.video-row:hover{border-color:#cfd8cf;transform:translateY(-1px)}
.vr-no{font-size:13px;font-weight:900;color:var(--muted);min-width:28px;font-variant-numeric:tabular-nums}
.vr-main{display:flex;flex-direction:column;gap:3px;flex:1;min-width:0}
.vr-t{font-weight:700;font-size:15.5px}
.vr-d{font-size:12.5px;color:var(--muted);line-height:1.5}
.vr-badge{font-size:11px;padding:3px 9px;border-radius:999px;font-weight:700;flex:none}
.vr-badge.free{background:#eaf4ee;color:var(--brand)}
.vr-badge.lock{background:#f2f0ec;color:#8b8578}
.vr-dur{font-size:12px;color:var(--muted);min-width:42px;text-align:right;flex:none}

/* 播放页锁 */
.lock-box{margin-top:18px;background:#fbf7ef;border:1px solid #ece2cf;border-radius:14px;padding:20px}
.lb-in{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}
.lb-ico{font-size:22px;line-height:1}
.lb-txt{flex:1;min-width:220px}
.lb-txt b{font-size:15.5px}
.lb-txt p{margin:6px 0 0;font-size:13.5px;color:#7a6a4f;line-height:1.7}
.lb-actions{display:flex;gap:10px;flex-wrap:wrap}
.lb-actions .btn-line{background:#fff;border:1px solid #d8d0c0;color:var(--ink2);font-weight:700}
.lb-actions .btn-line:hover{border-color:var(--brand);color:var(--brand)}

/* 表单卡片 */
.auth-card{max-width:460px;margin:44px auto 90px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow)}
.auth-card h2{margin:0 0 6px;font-size:23px}
.auth-card p.sub{margin:0 0 24px;color:var(--muted);font-size:13.5px;line-height:1.6}
.field-row{display:flex;gap:10px}
.field-row input{flex:1;min-width:0}
.btn-sm{padding:11px 16px;font-size:13.5px;white-space:nowrap;flex:none}
.auth-msg{margin-top:14px;font-size:13.5px;line-height:1.6;min-height:20px}
.auth-msg.err{color:#c4552d}
.auth-msg.ok{color:var(--brand)}
.auth-msg .dev{display:inline-block;margin-left:6px;padding:2px 8px;border-radius:6px;background:#eef4ee;color:var(--brand);font-weight:800;letter-spacing:.08em}
.auth-alt{margin-top:20px;padding-top:16px;border-top:1px solid var(--line2);font-size:13px;color:var(--muted);text-align:center}
.auth-alt a{color:var(--brand);font-weight:600}

/* 账号页 */
.acc-wrap{padding:24px 0 80px}
.acc-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow);margin-bottom:16px}
.acc-card h3{margin:0 0 16px;font-size:15px;color:var(--ink2)}
.acc-row{display:flex;justify-content:space-between;align-items:center;padding:11px 0;border-bottom:1px solid var(--line2);font-size:14px}
.acc-row:last-child{border-bottom:0}
.acc-row .k{color:var(--muted);font-size:13px}
.acc-row .v{font-weight:600}
.acc-secs{display:flex;flex-wrap:wrap;gap:10px}
.acc-sec{display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);font-size:13.5px}
.acc-sec.on{background:#eef4ee;border-color:#d3e2d8;color:var(--brand);font-weight:700}
.acc-sec.off{color:#9a9488;background:#faf9f6}
.acc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}
.acc-empty{color:var(--muted);font-size:13.5px}

@media (max-width:900px){
  .sec-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav-user{display:none}
  .auth-card{padding:24px;margin:24px auto 60px}
  .video-row{padding:14px;gap:10px}
  .vr-d{display:none}
  .lb-actions{width:100%}
  .acc-card{padding:18px}
}

/* 空态 */
.video-empty{
  padding:56px 24px;text-align:center;color:var(--muted);font-size:14px;
  background:var(--card);border:1px dashed var(--line);border-radius:14px;
}

/* 首页分区区块 */
.home-sec{padding-top:0}
.hs-head{display:flex;align-items:baseline;gap:14px;margin:0 0 6px}
.hs-head h2{margin:0;font-size:clamp(20px,2.8vw,26px);font-weight:850;letter-spacing:.01em}
.hs-meta{font-size:12.5px;color:var(--muted);white-space:nowrap}
.hs-desc{margin:0 0 18px;color:var(--muted);font-size:13.5px;line-height:1.65;max-width:640px}
.home-sec .video-list{padding-bottom:0}
.home-sec:last-of-type{padding-bottom:64px}

@media (max-width:640px){
  .hs-head{flex-wrap:wrap;gap:6px}
  .hs-meta{font-size:12px}
}

/* 购买说明弹窗 */
.modal{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}
.modal[hidden]{display:none}
.modal-mask{position:absolute;inset:0;background:rgba(14,19,25,.55);backdrop-filter:blur(2px)}
.modal-card{position:relative;max-width:520px;width:100%;background:#fff;border-radius:18px;padding:30px 28px 22px;box-shadow:0 24px 60px rgba(0,0,0,.28)}
.modal-card p{margin:0;font-size:15px;line-height:1.9;color:var(--ink2)}
.modal-card .hl{color:var(--accent);font-weight:900}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}
.modal-actions .btn{padding:11px 20px;font-size:14px}
@media (max-width:640px){
  .modal-card{padding:24px 20px 18px}
  .modal-card p{font-size:14.5px;line-height:1.85}
  .modal-actions{flex-direction:column-reverse}
  .modal-actions .btn{width:100%}
}

/* 课程简介 */
.outline-list{display:flex;flex-direction:column;gap:16px;margin-top:18px;max-width:760px}
.ol-item{border-left:3px solid #dfe7e0;padding:2px 0 2px 16px}
.ol-head{font-weight:800;font-size:15px;color:var(--ink);line-height:1.6}
.ol-desc{margin-top:5px;font-size:13.8px;color:var(--muted);line-height:1.75}
@media (max-width:640px){
  .outline-list{gap:14px;margin-top:14px}
  .ol-head{font-size:14.5px}
  .ol-desc{font-size:13.5px}
}

/* 课程简介展开 */
.video-item{margin-bottom:10px}
.video-item .video-row{margin-bottom:0}
.vr-tools{padding:8px 0 0 20px}
.vr-desc-btn{background:none;border:0;padding:2px 0;color:var(--brand);font-size:13px;font-weight:800;cursor:pointer;letter-spacing:.02em}
.vr-desc-btn:hover{text-decoration:underline}
.vr-outline{margin-top:10px;padding:16px 20px;background:#fbfaf7;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;gap:14px}
.vr-outline[hidden]{display:none}
.vr-outline .ol-item{border-left:3px solid #dfe7e0;padding-left:14px}
.vr-outline .ol-head{font-weight:800;font-size:14.5px;color:var(--ink);line-height:1.6}
.vr-outline .ol-desc{margin-top:4px;font-size:13.5px;color:var(--muted);line-height:1.7}
@media (max-width:640px){
  .vr-tools{padding-left:14px}
  .vr-outline{padding:14px}
}

/* 资料下载 */
.files-box{margin-top:20px;display:flex;flex-direction:column;gap:8px;max-width:760px}
.files-box[hidden]{display:none}
.file-item{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 18px;background:var(--card);border:1px solid var(--line);border-radius:12px;font-size:14.5px;transition:.15s}
.file-item:hover{border-color:#cfd8cf;transform:translateY(-1px)}
.fi-name{font-weight:700;color:var(--ink);min-width:0;word-break:break-all}
.fi-go{color:var(--brand);font-weight:800;font-size:13px;white-space:nowrap}
.file-lock{padding:14px 18px;border:1px dashed var(--line);border-radius:12px;color:var(--muted);font-size:13.5px;background:#fbfaf7}

.modal-input{width:100%;margin-top:16px;padding:13px 14px;border:1px solid var(--line);border-radius:11px;font-size:16px;letter-spacing:.1em;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#fdfcfa}
.modal-input:focus{outline:2px solid #cfe0d6;border-color:var(--brand)}
.modal-msg{margin-top:10px;font-size:13px;color:#c4552d;min-height:18px}
.stage-info .files-box{margin-top:14px}