/* ============================================================
   课程网站 · 全站样式
   深色底 + 主题主色。可选「科技蓝 / 翡翠绿 / 星云紫」三套，
   在后台「站点设置 → 配色主题」切换，或在 <html> 上加
   data-theme="blue|green|purple"。
   ============================================================ */

:root {
  --bg: #070811;
  --bg2: #0a0c18;
  --surface: #0f1220;
  --card: #131626;
  --line: rgba(255, 255, 255, .08);
  --line-strong: rgba(255, 255, 255, .14);
  --ink: #f4f6fa;
  --ink2: #afb6c9;
  --ink3: #6e7690;
  --accent-soft: rgba(var(--accent-rgb), .12);
  --ok: #34d17b;
  --warn: #ffc247;
  --danger: #ff5f5f;
  --radius: 18px;
  --font: 'Microsoft YaHei', system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Consolas, monospace;
}

/* ============================================================
   三套配色主题
   在 <html> 上加 data-theme="blue|green|purple" 即可切换。
   后台「站点设置 → 配色主题」可以直接选，无需改代码。
   ============================================================ */

/* 科技蓝（默认） */
[data-theme="blue"],
:root {
  --accent: #2f6bff;
  --accent-2: #63a0ff;
  --accent-rgb: 47, 107, 255;
  --hero-grad-end: #bfd5ff;
  --glow-2: rgba(58, 74, 138, .18);
}

/* 翡翠绿 */
[data-theme="green"] {
  --accent: #0ea47a;
  --accent-2: #3ddca0;
  --accent-rgb: 14, 164, 122;
  --hero-grad-end: #b4f0d9;
  --glow-2: rgba(14, 120, 95, .2);
}

/* 星云紫 */
[data-theme="purple"] {
  --accent: #8b5cf6;
  --accent-2: #b08cff;
  --accent-rgb: 139, 92, 246;
  --hero-grad-end: #e0d3ff;
  --glow-2: rgba(120, 80, 220, .2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: #fff; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; }
img { display: block; max-width: 100%; }
input, select, textarea { font-family: inherit; }

.container { width: min(1180px, 92vw); margin: 0 auto; }
.container-narrow { width: min(880px, 92vw); margin: 0 auto; }
.section { padding: 92px 0; position: relative; }
.mono { font-family: var(--mono); letter-spacing: .04em; }
.hide { display: none !important; }

.bg-veil {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1000px 520px at 78% -8%, var(--accent-soft), transparent 62%),
    radial-gradient(700px 460px at 8% 26%, var(--glow-2), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
}

/* ---------- 通用文字 ---------- */
.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .1em;
  margin-bottom: 18px;
  font-weight: 600;
}

.kicker::before {
  content: '';
  width: 26px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

.kicker.centered { justify-content: center; }

.h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.18;
}

.h2 em { font-style: normal; color: var(--accent); }
.sub { color: var(--ink2); font-size: 17px; max-width: 56ch; margin-top: 16px; }
.sub.centered { text-align: center; margin-inline: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  border-radius: 12px;
  transition: .22s;
  font-size: 16px;
  white-space: nowrap;
}

.btn .ar { transition: transform .22s; }
.btn:hover .ar { transform: translateX(3px); }
.btn-primary {
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  color: #fff;
  box-shadow: 0 10px 28px -8px rgba(var(--accent-rgb), .55);
}
.btn-primary:hover { filter: brightness(1.06); box-shadow: 0 14px 34px -8px rgba(var(--accent-rgb), .7); }
.btn-ghost { color: var(--ink); border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .02); }
.btn-ghost:hover { border-color: var(--accent); color: #fff; }
.btn-quiet { color: var(--ink2); background: rgba(255, 255, 255, .05); border: 1px solid var(--line); }
.btn-quiet:hover { color: #fff; border-color: var(--line-strong); }
.btn-danger { background: rgba(255, 95, 95, .12); color: var(--danger); border: 1px solid rgba(255, 95, 95, .3); }
.btn-danger:hover { background: rgba(255, 95, 95, .2); }
.btn-xl { padding: 18px 38px; font-size: 18px; border-radius: 14px; }
.btn-lg { padding: 16px 30px; font-size: 17px; }
.btn-md { padding: 12px 22px; font-size: 15px; }
.btn-sm { padding: 8px 14px; font-size: 13px; border-radius: 9px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

/* ============================================================
   顶部导航
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 8, 17, .74);
  border-bottom: 1px solid var(--line);
}

.nav-in { height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 16px;
  flex-shrink: 0;
  white-space: nowrap;
}
.brand .logo {
  display: inline-flex;
  align-items: center;
  background: var(--accent);
  color: #fff;
  font-weight: 900;
  border-radius: 9px;
  padding: 3px 8px;
  font-size: 14px;
}
.brand .sub-logo { color: var(--ink3); font-weight: 600; font-size: 14px; }
.nav-links { display: flex; gap: 30px; color: var(--ink2); font-size: 15px; }
.nav-links a:hover { color: #fff; }
.nav-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-user { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink2); }
.nav-user b { color: var(--ink); font-weight: 600; }

@media (max-width: 860px) {
  .nav-links { display: none; }
}

@media (max-width: 720px) {
  .nav-user { display: none; }
  .nav-right .btn { padding: 9px 14px; font-size: 13.5px; }
}

/* ============================================================
   首页 Hero
   ============================================================ */
.hero { padding: 74px 0 86px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink2);
  border: 1px solid var(--line-strong);
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .02);
  font-weight: 600;
}
.badge i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); display: inline-block; }

.hero h1 {
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 22px 0 20px;
}
.hero h1 .grad {
  background: linear-gradient(90deg, #fff 0%, var(--hero-grad-end) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero h1 .o { color: var(--accent); }
.hero .lead { color: var(--ink2); font-size: 18px; max-width: 50ch; }
.hero .lead b { color: var(--ink); }
.hero-cta { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }
.trust { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 34px; color: var(--ink2); font-size: 14px; }
.trust span { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.trust .dot { color: var(--accent); }

.hero-visual { position: relative; }
.visual-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 14px;
  box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .7);
}
.visual-card .screen { border-radius: 14px; overflow: hidden; background: #05060d; }
.visual-card img.cover { width: 100%; aspect-ratio: 7/4; object-fit: cover; }
.visual-card .cap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 6px 4px;
  font-size: 13px;
  color: var(--ink3);
}
.visual-card .cap .b { color: var(--ink); font-weight: 700; }

.play-badge {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(7, 8, 17, .34);
}
.play-badge span {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
  box-shadow: 0 0 0 10px rgba(var(--accent-rgb), .18), 0 16px 40px -8px rgba(var(--accent-rgb), .6);
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* ---------- 数据条 ---------- */
.proof { border-block: 1px solid var(--line); background: rgba(255, 255, 255, .015); }
.proof-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 34px 0; }
.proof .p { border-left: 2px solid var(--line-strong); padding-left: 18px; }
.proof .p b { font-size: 28px; font-weight: 800; display: block; letter-spacing: -.01em; }
.proof .p b em { font-style: normal; color: var(--accent); }
.proof .p small { color: var(--ink3); font-size: 13px; }

@media (max-width: 760px) {
  .proof-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- 试听 ---------- */
.trial-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; margin-top: 44px; }
.trial-player {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #000;
  box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .7);
  aspect-ratio: 16/9;
}
.trial-player video { width: 100%; height: 100%; display: block; background: #000; }
.trial-side .trial-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), .35);
  background: var(--accent-soft);
  padding: 6px 13px;
  border-radius: 999px;
  font-weight: 700;
  margin-bottom: 18px;
}
.trial-side h3 { font-size: 26px; font-weight: 800; margin-bottom: 12px; }
.trial-side p { color: var(--ink2); font-size: 15.5px; line-height: 1.85; margin-bottom: 26px; }

@media (max-width: 900px) {
  .trial-wrap { grid-template-columns: 1fr; }
}

/* ---------- 板块 / 角色 ---------- */
.roles {
  background: linear-gradient(180deg, rgba(var(--accent-rgb), .06), transparent);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px;
  margin: 40px 0 34px;
}
.roles-title {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink3);
  letter-spacing: .08em;
  margin-bottom: 18px;
}
.role-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.role {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}
.role .ri { font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 700; }
.role b { display: block; margin: 8px 0 6px; font-size: 16px; }
.role small { color: var(--ink3); font-size: 12.5px; line-height: 1.6; display: block; }

@media (max-width: 900px) {
  .role-grid { grid-template-columns: 1fr 1fr; }
}

.mod-wrap { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.mod {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  transition: .22s;
}
.mod:hover { border-color: rgba(var(--accent-rgb), .4); transform: translateY(-2px); }
.mod .mh { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.mod .mh .no {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), .3);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 3px 9px;
  font-weight: 700;
}
.mod .mh b { font-size: 18px; }
.mod p { color: var(--ink2); font-size: 14.5px; line-height: 1.8; }
.mod .cnt { margin-top: 14px; font-size: 12.5px; color: var(--ink3); font-family: var(--mono); }
.mod-note { margin-top: 24px; color: var(--ink3); font-size: 14px; text-align: center; }
.mod-note b { color: var(--accent); }

/* ---------- 课程目录（首页） ---------- */
.outline { display: grid; gap: 16px; margin-top: 34px; }

.chapter {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px;
}

.chapter-bar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.chapter-bar .no {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), .3);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 3px 10px;
  font-weight: 700;
  white-space: nowrap;
}
.chapter-bar b { font-size: 17px; }
.chapter-bar .cnt { margin-left: auto; color: var(--ink3); font-size: 12.5px; font-family: var(--mono); }
.chapter-desc { color: var(--ink3); font-size: 13.5px; margin-top: 10px; line-height: 1.7; }

.lesson-list { list-style: none; margin-top: 14px; display: grid; gap: 2px; }
.lesson-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14.5px;
  color: var(--ink2);
}
.lesson-list li:hover { background: rgba(255, 255, 255, .04); color: var(--ink); }
.lesson-list .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink3);
  min-width: 22px;
}
.lesson-list .t { flex: 1; }

.li-tag {
  font-size: 11px;
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), .35);
  border-radius: 6px;
  padding: 1px 7px;
  white-space: nowrap;
}

.empty { color: var(--ink3); font-size: 14px; text-align: center; padding: 26px 0; }

/* ---------- 课程首页 ---------- */
.course-head {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 36px;
  align-items: center;
  padding: 46px 0 30px;
}

.course-cover {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #05060d;
  box-shadow: 0 30px 70px -34px rgba(0, 0, 0, .75);
}

.course-cover img { width: 100%; aspect-ratio: 7/4; object-fit: cover; display: block; }
.course-info h1 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; line-height: 1.25; }
.course-desc { color: var(--ink2); font-size: 15px; line-height: 1.9; margin-top: 14px; max-width: 62ch; }

.course-progress {
  margin-top: 26px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 22px;
}

.cp-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
  color: var(--ink3);
  margin-bottom: 12px;
}

.cp-row b { color: var(--ink); font-weight: 700; }
.cp-last { color: var(--ink3); font-size: 13px; margin-top: 12px; }
.course-actions { margin-top: 22px; }

@media (max-width: 900px) {
  .course-head { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; }
}

.lesson-list.clickable li { cursor: pointer; }
.lesson-list li.done { color: var(--ink3); }
.lesson-list li.done .t { text-decoration: line-through; text-decoration-color: rgba(255, 255, 255, .25); }
.lesson-list li.done .idx::after { content: ' ✓'; color: var(--ok); }
.lesson-list li.doing {
  background: var(--accent-soft);
  color: #fff;
  border: 1px solid rgba(var(--accent-rgb), .28);
}
.lesson-list li:not(.done):not(.doing) .t { color: var(--ink2); }

.li-state {
  font-size: 12px;
  color: var(--ink3);
  white-space: nowrap;
  font-family: var(--mono);
}
.lesson-list li.doing .li-state { color: var(--accent-2); }

@media (max-width: 760px) {
  .mod-wrap { grid-template-columns: 1fr; }
}

/* ---------- 三步 ---------- */
.how { background: rgba(255, 255, 255, .015); border-block: 1px solid var(--line); }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 44px; }
.step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  position: relative;
}
.step .sn { font-family: var(--mono); font-size: 12px; color: var(--ink3); letter-spacing: .1em; }
.step .idx { position: absolute; right: 22px; top: 16px; font-size: 44px; font-weight: 900; color: rgba(255, 255, 255, .05); }
.step h4 { font-size: 19px; margin: 12px 0 10px; }
.step p { color: var(--ink2); font-size: 14.5px; line-height: 1.8; }

@media (max-width: 860px) {
  .how-grid { grid-template-columns: 1fr; }
}

/* ---------- 学习特性 ---------- */
.study-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 40px; }
.study-item { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.study-item .si-ico { font-size: 24px; }
.study-item h4 { font-size: 17px; margin: 12px 0 8px; }
.study-item p { color: var(--ink2); font-size: 14px; line-height: 1.75; }

@media (max-width: 900px) {
  .study-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- 关于 ---------- */
.about-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 36px;
  margin-top: 32px;
}
.about-card p { color: var(--ink2); font-size: 15.5px; line-height: 1.95; margin-bottom: 18px; }
.about-lead { font-size: 20px !important; color: var(--ink) !important; font-weight: 700; }
.about-strong { color: var(--accent) !important; font-weight: 700; }
.about-h { font-size: 17px; font-weight: 700; margin: 26px 0 16px; color: var(--ink); }
.about-list { list-style: none; display: grid; gap: 14px; }
.about-list li {
  color: var(--ink2);
  font-size: 15px;
  line-height: 1.85;
  padding-left: 18px;
  position: relative;
}
.about-list li::before { content: '◆'; color: var(--accent); position: absolute; left: 0; font-size: 10px; top: 7px; }
.about-list b { color: var(--ink); }

/* ---------- 价格 ---------- */
.pricing { background: rgba(255, 255, 255, .015); border-block: 1px solid var(--line); }
.price-card {
  max-width: 560px;
  margin: 0 auto;
  background: linear-gradient(180deg, rgba(var(--accent-rgb), .08), var(--card) 40%);
  border: 1px solid rgba(var(--accent-rgb), .28);
  border-radius: 22px;
  padding: 38px;
  box-shadow: 0 40px 80px -40px rgba(var(--accent-rgb), .4);
}
.price-tag { display: flex; align-items: baseline; gap: 14px; justify-content: center; }
.price-tag .now { font-size: 62px; font-weight: 900; letter-spacing: -.02em; color: var(--accent); }
.price-tag .now small { font-size: 26px; font-weight: 800; }
.price-tag .was { color: var(--ink3); text-decoration: line-through; font-size: 20px; font-family: var(--mono); }
.price-note { text-align: center; color: var(--ink3); font-size: 13.5px; margin-top: 8px; }
.price-list { list-style: none; display: grid; gap: 14px; margin: 30px 0; }
.price-list li { display: flex; gap: 12px; color: var(--ink2); font-size: 15px; line-height: 1.7; }
.price-list li::before { content: '✓'; color: var(--ok); font-weight: 900; flex-shrink: 0; }
.buy-qr {
  display: flex;
  gap: 18px;
  align-items: center;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px dashed var(--line-strong);
}
.buy-qr img {
  width: 132px;
  height: 132px;
  border-radius: 12px;
  background: #fff;
  object-fit: contain;
  padding: 6px;
  flex-shrink: 0;
}
.buy-qr-txt b { display: block; margin-bottom: 8px; font-size: 15px; }
.buy-qr-txt p { color: var(--ink3); font-size: 13.5px; line-height: 1.75; }
.buy-qr.plain { margin-top: 0; padding-top: 0; border-top: none; }
.buy-qr-note {
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 9px;
  background: rgba(var(--accent-rgb), .08);
  border: 1px solid rgba(var(--accent-rgb), .22);
  color: var(--ink2) !important;
  font-size: 12.5px !important;
}

@media (max-width: 560px) {
  .buy-qr { flex-direction: column; text-align: center; }
  .price-card { padding: 26px; }
}

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 12px; margin-top: 32px; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 4px 22px;
  transition: .2s;
}
.faq-item[open] { border-color: rgba(var(--accent-rgb), .35); }
.faq-item summary {
  cursor: pointer;
  padding: 18px 0;
  font-weight: 700;
  font-size: 16px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; color: var(--accent); font-size: 22px; font-weight: 400; }
.faq-item[open] summary::after { content: '−'; }
.fa-b { color: var(--ink2); font-size: 15px; line-height: 1.85; padding-bottom: 20px; }

/* ---------- 资料包 ---------- */
.prompt-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 30px;
  margin-top: 34px;
}
.prompt-info { display: flex; align-items: center; gap: 18px; }
.prompt-info .p-ico { font-size: 30px; }
.prompt-info h3 { font-size: 18px; margin-bottom: 6px; }
.prompt-info p { color: var(--ink3); font-size: 13.5px; }
.prompt-tip { color: var(--ink3); font-size: 13px; margin-top: 14px; }

@media (max-width: 760px) {
  .prompt-card { flex-direction: column; align-items: stretch; }
}

/* ---------- 最终 CTA ---------- */
.final { text-align: center; }
.final h2 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; }
.final p { color: var(--ink2); font-size: 17px; margin: 18px auto 32px; max-width: 52ch; }

/* ---------- 学员入口 ---------- */
.listen-card {
  background: linear-gradient(180deg, var(--glow-2), var(--card));
  border: 1px solid var(--line-strong);
  border-radius: 22px;
  padding: 46px;
  text-align: center;
}
.listen-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--ink3);
  font-size: 13px;
  margin: 28px 0 20px;
  justify-content: center;
}
.listen-divider::before,
.listen-divider::after { content: ''; height: 1px; background: var(--line-strong); width: 60px; }
.unlock-form { display: flex; gap: 12px; max-width: 520px; margin: 0 auto; }
.unlock-form input {
  flex: 1;
  background: rgba(0, 0, 0, .35);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 0 18px;
  color: var(--ink);
  font-size: 15px;
  font-family: var(--mono);
  height: 54px;
}
.unlock-form input:focus { outline: none; border-color: var(--accent); }
.lock-tip { color: var(--ink3); font-size: 13.5px; margin-top: 16px; }

@media (max-width: 620px) {
  .unlock-form { flex-direction: column; }
  .listen-card { padding: 30px 22px; }
}

/* ---------- 页脚 ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 34px 0;
  color: var(--ink3);
  font-size: 13.5px;
}
.footer-in { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a:hover { color: var(--ink); }

/* ============================================================
   表单 / 登录注册页
   ============================================================ */
.auth-wrap { min-height: calc(100vh - 64px); display: flex; align-items: center; padding: 50px 0; }
.auth-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; width: 100%; }
.auth-side h2 { font-size: clamp(26px, 3vw, 38px); font-weight: 800; line-height: 1.25; }
.auth-side ul { list-style: none; display: grid; gap: 14px; margin-top: 28px; }
.auth-side li { color: var(--ink2); font-size: 15px; display: flex; gap: 12px; line-height: 1.7; }
.auth-side li::before { content: '◆'; color: var(--accent); font-size: 10px; margin-top: 8px; }
.auth-side li strong { color: var(--ink); }

.redeem-qr {
  display: flex;
  gap: 18px;
  align-items: center;
  margin-top: 32px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}

.redeem-qr img {
  width: 104px;
  height: 104px;
  border-radius: 10px;
  background: #fff;
  padding: 5px;
  object-fit: contain;
  flex-shrink: 0;
}

.redeem-qr b { display: block; margin-bottom: 6px; font-size: 14.5px; }
.redeem-qr p { color: var(--ink3); font-size: 13px; line-height: 1.7; }

@media (max-width: 520px) {
  .redeem-qr { flex-direction: column; text-align: center; }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 34px;
}
.card-title { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.card-desc { color: var(--ink3); font-size: 13.5px; margin-bottom: 26px; }

.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; color: var(--ink2); margin-bottom: 8px; font-weight: 600; }
.field input,
.field select,
.field textarea {
  width: 100%;
  background: rgba(0, 0, 0, .32);
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  padding: 13px 16px;
  color: var(--ink);
  font-size: 15px;
  transition: .18s;
}
.field input:focus,
.field select:focus,
.field textarea:focus { outline: none; border-color: var(--accent); background: rgba(0, 0, 0, .5); }
.field .hint { color: var(--ink3); font-size: 12.5px; margin-top: 7px; line-height: 1.65; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.switch-row:last-child { border-bottom: none; }
.switch-row .txt b { display: block; font-size: 14.5px; }
.switch-row .txt small { color: var(--ink3); font-size: 12.5px; }
.switch { position: relative; width: 46px; height: 26px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, .14);
  border-radius: 999px;
  transition: .2s;
  cursor: pointer;
}
.switch span::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  top: 3px;
  left: 3px;
  transition: .2s;
}
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::before { transform: translateX(20px); }

.form-foot { text-align: center; color: var(--ink3); font-size: 14px; margin-top: 22px; }
.form-foot a { color: var(--accent); font-weight: 700; }
.legal-line { color: var(--ink3); font-size: 12.5px; line-height: 1.7; margin-top: 18px; text-align: center; }
.legal-line a { color: var(--ink2); text-decoration: underline; }

@media (max-width: 900px) {
  .auth-grid { grid-template-columns: 1fr; gap: 36px; }
  .auth-side { order: 2; }
}

/* ============================================================
   学习中心
   ============================================================ */
.learn-layout {
  display: grid;
  grid-template-columns: 330px 1fr;
  gap: 26px;
  align-items: start;
  padding: 30px 0 70px;
}
.learn-side {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  position: sticky;
  top: 84px;
  max-height: calc(100vh - 110px);
  display: flex;
  flex-direction: column;
}
.learn-side-head { padding: 20px 22px; border-bottom: 1px solid var(--line); }
.learn-side-head h3 { font-size: 16px; }
.learn-side-head p { color: var(--ink3); font-size: 12.5px; margin-top: 6px; }
.learn-tree { overflow-y: auto; padding: 12px; }
.learn-tree .chap { margin-bottom: 8px; }
.learn-tree .chap-h {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: 13.5px;
  color: var(--ink2);
  font-weight: 700;
}
.learn-tree .chap-h .no {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 2px 7px;
}
.lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--ink2);
  cursor: pointer;
  transition: .16s;
}
.lesson-item:hover { background: rgba(255, 255, 255, .05); color: var(--ink); }
.lesson-item.active { background: var(--accent-soft); color: #fff; }
.lesson-item.active .li-title { font-weight: 700; }
.lesson-item.locked { color: var(--ink3); cursor: not-allowed; }
.lesson-item .li-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-item .li-tag {
  font-size: 11px;
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), .35);
  border-radius: 6px;
  padding: 1px 6px;
  flex-shrink: 0;
}
.lesson-item .li-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); flex-shrink: 0; }

.player-card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.player-stage { position: relative; background: #000; aspect-ratio: 16/9; }
.player-stage video { width: 100%; height: 100%; display: block; }
.player-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--ink3);
  text-align: center;
  padding: 30px;
}
.player-placeholder .ico { font-size: 40px; opacity: .6; }
.player-placeholder b { color: var(--ink2); font-size: 16px; }
.player-placeholder p { font-size: 13.5px; max-width: 44ch; line-height: 1.7; }

/* 动态水印：放在视频上层，用于追溯录屏泄露 */
.wm-layer { position: absolute; inset: 0; pointer-events: none; overflow: hidden; z-index: 5; }
.wm-layer span {
  position: absolute;
  font-size: 12px;
  color: rgba(255, 255, 255, .16);
  white-space: nowrap;
  font-family: var(--mono);
  transform: rotate(-22deg);
  transition: top 2s linear, left 2s linear;
}

.player-meta { padding: 22px 26px; display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.player-meta h2 { font-size: 19px; }
.player-meta p { color: var(--ink3); font-size: 13px; margin-top: 6px; }
.player-actions { display: flex; gap: 10px; flex-shrink: 0; }

.progress-bar { height: 4px; background: rgba(255, 255, 255, .08); }
.progress-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); width: 0; transition: width .3s; }

.locked-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(7, 8, 17, .92);
  text-align: center;
  padding: 30px;
}
.locked-panel .ico { font-size: 38px; }
.locked-panel b { font-size: 18px; }
.locked-panel p { color: var(--ink2); font-size: 14px; max-width: 46ch; line-height: 1.75; }

@media (max-width: 980px) {
  .learn-layout { grid-template-columns: 1fr; }
  .learn-side { position: static; max-height: 420px; order: 2; }
}

/* ============================================================
   个人中心
   ============================================================ */
.page-head { padding: 46px 0 30px; }
.page-head h1 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; }
.page-head p { color: var(--ink2); margin-top: 10px; font-size: 15px; }

.panel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; padding-bottom: 70px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px; }
.panel h3 { font-size: 17px; margin-bottom: 18px; }
.kv { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.kv:last-child { border-bottom: none; }
.kv span { color: var(--ink3); }
.kv b { font-weight: 600; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
}
.tag-ok { color: var(--ok); background: rgba(52, 209, 123, .1); border-color: rgba(52, 209, 123, .3); }
.tag-warn { color: var(--warn); background: rgba(255, 194, 71, .1); border-color: rgba(255, 194, 71, .3); }
.tag-off { color: var(--ink3); background: rgba(255, 255, 255, .05); border-color: var(--line-strong); }
.tag-danger { color: var(--danger); background: rgba(255, 95, 95, .1); border-color: rgba(255, 95, 95, .3); }

.empty { color: var(--ink3); font-size: 14px; text-align: center; padding: 26px 0; }

.notice {
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.75;
  margin-bottom: 20px;
}
.notice-warn { background: rgba(255, 194, 71, .1); border: 1px solid rgba(255, 194, 71, .3); color: #ffd98a; }
.notice-info { background: var(--glow-2); border: 1px solid var(--line-strong); color: var(--ink2); }
.notice-ok { background: rgba(52, 209, 123, .1); border: 1px solid rgba(52, 209, 123, .3); color: #8ff0bb; }

@media (max-width: 860px) {
  .panel-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   提示层
   ============================================================ */
.toast {
  position: fixed;
  left: 50%;
  bottom: 42px;
  transform: translateX(-50%) translateY(20px);
  background: rgba(19, 22, 38, .98);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 14px 26px;
  font-size: 14.5px;
  opacity: 0;
  pointer-events: none;
  transition: .25s;
  z-index: 200;
  max-width: 90vw;
  text-align: center;
  box-shadow: 0 20px 50px -18px rgba(0, 0, 0, .8);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.ok { border-color: rgba(52, 209, 123, .45); }
.toast.err { border-color: rgba(255, 95, 95, .45); }

.mask {
  position: fixed;
  inset: 0;
  background: rgba(4, 5, 12, .8);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 150;
  padding: 24px;
}
.mask.show { display: flex; }
.modal {
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 32px;
  width: min(520px, 100%);
  max-height: 88vh;
  overflow-y: auto;
}
.modal h3 { font-size: 20px; margin-bottom: 8px; }
.modal .modal-desc { color: var(--ink3); font-size: 13.5px; margin-bottom: 22px; }

/* ============================================================
   合规与法律页面
   ============================================================ */
.doc { padding: 50px 0 90px; }
.doc h1 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; margin-bottom: 10px; }
.doc .doc-meta { color: var(--ink3); font-size: 13.5px; margin-bottom: 32px; }
.doc h2 { font-size: 19px; font-weight: 800; margin: 34px 0 14px; }
.doc h3 { font-size: 16px; font-weight: 700; margin: 22px 0 10px; }
.doc p, .doc li { color: var(--ink2); font-size: 15px; line-height: 1.95; }
.doc ul, .doc ol { padding-left: 22px; display: grid; gap: 8px; margin: 12px 0; }
.doc strong { color: var(--ink); }