/* ============================================================
   开缠门 · 赛博玻璃设计系统（KCM Cyber-Glass）
   参照 www.kaichanmen.com 官网视觉：深色底 + 网格 + 径向光晕 +
   浮空粒子 + 玻璃卡片 + 渐变标题 + 发光按钮。
   主题通过 --accent / --accent-rgb 驱动，按板块切换配色。
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

/* ---------- 主题变量 ---------- */
:root,
[data-theme="home"] {
  --bg: #03060f;
  --accent: #00d4ff;        --accent-rgb: 0,212,255;
  --accent-2: #a5b4fc;      --accent-2-rgb: 165,180,252;
  --text: #eaf3ff;
  --muted: rgba(214,232,255,0.72);
  --panel: rgba(8,16,32,0.72);
  --line: rgba(0,212,255,0.22);
}
[data-theme="medicine"] {
  --bg: #030f0a;
  --accent: #1ed67e;        --accent-rgb: 30,214,126;
  --accent-2: #5eead4;      --accent-2-rgb: 94,234,212;
  --text: #ecfff5;
  --muted: rgba(206,255,232,0.74);
  --panel: rgba(6,20,16,0.72);
  --line: rgba(30,214,126,0.22);
}
[data-theme="finance"] {
  --bg: #03070f;
  --accent: #4d8dff;        --accent-rgb: 77,141,255;
  --accent-2: #7aa8ff;      --accent-2-rgb: 122,168,255;
  --text: #eaf2ff;
  --muted: rgba(208,224,255,0.74);
  --panel: rgba(8,14,30,0.72);
  --line: rgba(77,141,255,0.22);
}
[data-theme="about"] {
  --bg: #0f0803;
  --accent: #ff8a3d;        --accent-rgb: 255,138,61;
  --accent-2: #ffb37a;      --accent-2-rgb: 255,179,122;
  --text: #fff3e9;
  --muted: rgba(255,228,205,0.76);
  --panel: rgba(26,14,8,0.72);
  --line: rgba(255,138,61,0.24);
}

/* 卡片局部配色（首页三板块各自带色） */
.card.med   { --accent:#1ed67e; --accent-rgb:30,214,126;  --accent-2:#5eead4; --accent-2-rgb:94,234,212;  --line:rgba(30,214,126,0.28); }
.card.fin   { --accent:#4d8dff; --accent-rgb:77,141,255;  --accent-2:#7aa8ff; --accent-2-rgb:122,168,255; --line:rgba(77,141,255,0.28); }
.card.about { --accent:#ff8a3d; --accent-rgb:255,138,61;  --accent-2:#ffb37a; --accent-2-rgb:255,179,122; --line:rgba(255,138,61,0.30); }

/* ---------- 背景层 ---------- */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
}
body::before { /* 网格 */
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(var(--accent-rgb), 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--accent-rgb), 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none; z-index: 0;
}
body::after { /* 径向光晕 */
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(var(--accent-rgb), 0.20), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 90%, rgba(var(--accent-2-rgb), 0.12), transparent 50%),
    radial-gradient(ellipse 50% 30% at 0% 60%, rgba(var(--accent-rgb), 0.08), transparent 45%);
  pointer-events: none; z-index: 0;
  transition: background 0.4s ease;
}

/* ---------- 浮空粒子 ---------- */
.particles { position: fixed; inset: 0; overflow: hidden; pointer-events: none; z-index: 1; }
.particle {
  position: absolute; width: 3px; height: 3px;
  background: rgba(var(--accent-rgb), 0.55);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(var(--accent-rgb), 0.6);
  animation: float-up linear infinite;
}
@keyframes float-up {
  0%   { transform: translateY(100vh) scale(0); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 0.6; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

/* ---------- 顶栏 ---------- */
.topbar {
  position: relative; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  max-width: 1140px; margin: 0 auto; width: 100%;
  padding: 1rem 1.5rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .6rem;
  font-weight: 700; font-size: 1.02rem; color: var(--text); text-decoration: none;
  letter-spacing: .02em;
}
.brand .dot {
  width: 34px; height: 34px; border-radius: 11px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.30), rgba(var(--accent-2-rgb), 0.20));
  border: 1px solid rgba(var(--accent-rgb), 0.40);
  color: var(--accent); font-size: .82rem; font-weight: 800;
  box-shadow: 0 0 18px rgba(var(--accent-rgb), 0.25);
}
.topnav { display: flex; align-items: center; gap: .15rem; flex-wrap: wrap; }
.topnav a {
  color: var(--muted); text-decoration: none; font-size: .88rem;
  padding: .45rem .8rem; border-radius: 10px; transition: .2s;
}
.topnav a:hover { color: var(--text); background: rgba(var(--accent-rgb), 0.08); }
.topnav a.active { color: var(--accent); background: rgba(var(--accent-rgb), 0.12); }
.login-pill {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .5rem .95rem !important; border-radius: 999px !important;
  border: 1px solid rgba(var(--accent-rgb), 0.35) !important;
  color: var(--accent) !important; font-weight: 600;
  background: rgba(var(--accent-rgb), 0.08) !important;
  transition: .2s;
}
.login-pill:hover { box-shadow: 0 0 20px rgba(var(--accent-rgb), 0.22); transform: translateY(-1px); }
.user-chip {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .4rem .8rem; border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.10);
  border: 1px solid rgba(var(--accent-rgb), 0.30);
  color: var(--text); font-size: .85rem;
}
.user-chip .ava {
  width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center; font-size: .72rem; font-weight: 700;
  background: rgba(var(--accent-rgb), 0.25); color: var(--accent);
}
.user-chip .online { width: 7px; height: 7px; border-radius: 50%; background: #3fcf6b; box-shadow: 0 0 8px #3fcf6b; }
.user-chip .logout { color: var(--muted); cursor: pointer; margin-left: .2rem; }
.user-chip .logout:hover { color: #ff7a7a; }

/* ---------- 英雄区 ---------- */
.hero {
  position: relative; z-index: 2; text-align: center;
  max-width: 780px; margin: 0 auto;
  padding: 3rem 1.25rem 1.5rem;
}
.mark-badge {
  display: inline-block; font-size: .8rem; font-weight: 600; letter-spacing: .12em;
  padding: .4rem 1rem; border-radius: 999px; margin-bottom: 1.4rem;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.30);
  box-shadow: 0 0 24px rgba(var(--accent-rgb), 0.10) inset;
}
.hero h1 {
  font-size: clamp(2.1rem, 6vw, 3.3rem); font-weight: 800; letter-spacing: -.01em;
  line-height: 1.12; margin-bottom: .7rem;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .sub { font-size: clamp(1rem, 2.6vw, 1.18rem); color: var(--text); opacity: .92; margin-bottom: .5rem; }
.hero .tag { font-size: .95rem; color: var(--muted); }

/* 副页 hero（更紧凑） */
.hero.sub { padding: 2rem 1.25rem 1rem; }
.hero.sub h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); }
.hero .lead {
  max-width: 620px; margin: .6rem auto 0; font-size: .98rem; color: var(--muted); line-height: 1.7;
}

/* ---------- 区块标题 ---------- */
.section-head {
  position: relative; z-index: 2;
  max-width: 1000px; margin: 1.5rem auto .5rem; padding: 0 1.25rem;
  text-align: center;
}
.section-head .eyebrow {
  font-size: .78rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
}
.section-head h2 {
  font-size: clamp(1.4rem, 4vw, 1.9rem); font-weight: 700; margin: .35rem 0;
}

/* ---------- 卡片网格 ---------- */
.grid {
  position: relative; z-index: 2;
  max-width: 1000px; margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.15rem;
}
.card {
  display: flex; flex-direction: column; text-decoration: none; color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 22px; padding: 1.6rem;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  transition: transform .28s ease, border-color .28s ease, box-shadow .28s ease;
  position: relative; overflow: hidden;
}
.card::before { /* 顶部柔光 */
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 120px;
  background: radial-gradient(circle at 50% 0%, rgba(var(--accent-rgb), 0.16), transparent 70%);
  opacity: 0; transition: opacity .28s ease; pointer-events: none;
}
.card:hover {
  transform: translateY(-5px);
  border-color: rgba(var(--accent-rgb), 0.55);
  box-shadow: 0 22px 60px rgba(0,0,0,0.45), 0 0 34px rgba(var(--accent-rgb), 0.16);
}
.card:hover::before { opacity: 1; }
.card .ic {
  width: 50px; height: 50px; border-radius: 15px;
  display: grid; place-items: center; font-size: 1.5rem;
  background: rgba(var(--accent-rgb), 0.12);
  border: 1px solid rgba(var(--accent-rgb), 0.32);
  margin-bottom: 1.05rem;
}
.card h3 { font-size: 1.12rem; font-weight: 700; margin-bottom: .4rem; }
.card p { font-size: .88rem; color: var(--muted); line-height: 1.65; flex: 1; }
.card .go {
  margin-top: 1.1rem; color: var(--accent); font-weight: 600; font-size: .86rem;
  display: inline-flex; align-items: center; gap: .35rem;
}
.card .go .arrow { transition: transform .28s ease; }
.card:hover .go .arrow { transform: translateX(4px); }

/* 醒目 CTA 卡（考试测试入口等） */
.card.cta-card {
  grid-column: 1 / -1;
  text-align: center;
  border-color: rgba(var(--accent-rgb), 0.5);
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.16), var(--panel) 62%);
  box-shadow: 0 18px 50px rgba(0,0,0,0.4), 0 0 32px rgba(var(--accent-rgb), 0.20);
  padding: 2.2rem 2rem;
}
.card.cta-card .ic { width: 72px; height: 72px; font-size: 2.2rem; margin: 0 auto 1.2rem; }
.card.cta-card h3 { font-size: 1.6rem; margin-bottom: .5rem; }
.card.cta-card p { font-size: .95rem; max-width: 600px; margin: 0 auto 1rem; }
.card.cta-card .go { font-size: 1rem; justify-content: center; }
@media (max-width: 720px) {
  .card.cta-card { padding: 1.8rem 1.2rem; }
}

/* 大号特色卡（首页板块 / hero 下方 CTA） */
.card.feature { min-height: 190px; }

/* ---------- 列表式导航按钮（与官网一致的竖排） ---------- */
.nav-list { position: relative; z-index: 2; list-style: none; display: flex; flex-direction: column; gap: .8rem; max-width: 640px; margin: 0 auto; padding: 0 1.25rem 2.5rem; }
.nav-btn {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: 1rem 1.25rem; border-radius: 16px;
  background: rgba(var(--accent-rgb), 0.06);
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  color: var(--text); text-decoration: none; font-size: .96rem; font-weight: 500;
  cursor: pointer; transition: all .25s ease; font-family: inherit; text-align: left;
}
.nav-btn:hover, .nav-btn:focus-visible {
  background: rgba(var(--accent-rgb), 0.14);
  border-color: rgba(var(--accent-rgb), 0.45);
  box-shadow: 0 0 24px rgba(var(--accent-rgb), 0.20), 0 0 0 1px rgba(var(--accent-rgb), 0.10) inset;
  transform: translateY(-1px); outline: none;
}
.nav-btn-text { display: flex; align-items: center; gap: .7rem; flex: 1; min-width: 0; }
.nav-btn-text .icon { font-size: 1.2rem; flex-shrink: 0; }
.nav-btn-text .label { flex: 1; min-width: 0; }
.nav-btn-text .desc { font-size: .78rem; color: var(--muted); font-weight: 400; }
.nav-btn .arrow { flex-shrink: 0; color: rgba(var(--accent-rgb), 0.75); font-size: 1.15rem; margin-left: .6rem; }

/* ---------- 玻璃内容卡（联系 / 书本 / 视频等） ---------- */
.panel-box {
  position: relative; z-index: 2;
  max-width: 720px; margin: 0 auto 2.5rem;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 22px; padding: 1.8rem;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
}
.panel-box h3 { font-size: 1.05rem; color: var(--accent); margin-bottom: .8rem; }
.panel-box p { color: var(--muted); font-size: .92rem; line-height: 1.75; margin-bottom: .6rem; }

/* 书本封面占位 */
.book-cover {
  width: 130px; height: 180px; border-radius: 8px; flex-shrink: 0;
  background: linear-gradient(160deg, rgba(var(--accent-rgb), 0.35), rgba(var(--accent-2-rgb), 0.18));
  border: 1px solid rgba(var(--accent-rgb), 0.45);
  display: grid; place-items: center; text-align: center; padding: .8rem;
  color: var(--text); font-weight: 700; font-size: .95rem; line-height: 1.4;
  box-shadow: 0 12px 40px rgba(var(--accent-rgb), 0.18);
}
.book-row { display: flex; gap: 1.4rem; align-items: flex-start; }
.book-chapters { list-style: none; margin-top: .6rem; }
.book-chapters li {
  font-size: .88rem; color: var(--muted); padding: .4rem 0; border-bottom: 1px dashed rgba(var(--accent-rgb), 0.14);
  display: flex; gap: .6rem;
}
.book-chapters li .no { color: var(--accent); font-weight: 700; }

/* 视频网格 */
.video-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.video-card {
  display: block; text-decoration: none; color: var(--text);
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
  transition: .25s;
}
.video-card:hover { transform: translateY(-4px); border-color: rgba(var(--accent-rgb), 0.5); box-shadow: 0 16px 44px rgba(0,0,0,.4), 0 0 26px rgba(var(--accent-rgb), 0.15); }
.video-thumb {
  aspect-ratio: 16/9; display: grid; place-items: center; font-size: 2rem;
  background: linear-gradient(160deg, rgba(var(--accent-rgb), 0.22), rgba(var(--accent-2-rgb), 0.10));
  border-bottom: 1px solid var(--line);
}
.video-card .meta { padding: .85rem 1rem; }
.video-card .meta h4 { font-size: .92rem; font-weight: 600; margin-bottom: .25rem; }
.video-card .meta span { font-size: .76rem; color: var(--muted); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .8rem 1.4rem; border-radius: 12px; font-family: inherit;
  font-size: .92rem; font-weight: 600; cursor: pointer; border: none;
  text-decoration: none; transition: all .25s ease; white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #03060f;
  box-shadow: 0 6px 24px rgba(var(--accent-rgb), 0.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 32px rgba(var(--accent-rgb), 0.45); }
.btn-ghost {
  background: rgba(var(--accent-rgb), 0.06); color: var(--text);
  border: 1px solid rgba(var(--accent-rgb), 0.30);
}
.btn-ghost:hover { background: rgba(var(--accent-rgb), 0.14); border-color: rgba(var(--accent-rgb), 0.5); }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative; z-index: 2;
  margin: 1rem auto 2rem; max-width: 1000px; padding: 0 1.25rem;
  font-size: .8rem; color: var(--muted); text-align: center;
  border-top: 1px solid rgba(var(--accent-rgb), 0.12); padding-top: 1.4rem;
}
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .topbar { padding: .85rem 1rem; flex-wrap: wrap; }
  .topnav a { padding: .4rem .55rem; font-size: .82rem; }
  .hero { padding: 2.2rem 1.1rem 1rem; }
  .grid { grid-template-columns: 1fr; padding: 1.2rem 1.1rem 2.5rem; gap: 1rem; }
  .panel-box { margin: 0 1.1rem 2.2rem; padding: 1.4rem; }
  .book-row { flex-direction: column; align-items: center; text-align: center; }
  .nav-btn { padding: .9rem 1rem; }
  .nav-btn-text .desc { display: none; }
}
@media (max-width: 420px) {
  .topnav .nav-label-hide { display: none; }
}