/* ============================================================
   HoloEdu Landing Page
   品牌：indigo #4f46e5 → violet #7c3aed · 深空 #0b0e1f · 金色 #f5b301
   ============================================================ */

:root {
  --primary: #4f46e5;
  --primary-deep: #312e81;
  --violet: #7c3aed;
  --ink: #1e293b;
  --ink-soft: #475569;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f7f8fd;
  --dark: #0b0e1f;
  --dark-soft: #141a33;
  --gold: #f5b301;
  --gold-deep: #d98f00;
  --radius: 18px;
  --shadow: 0 20px 50px rgba(30, 27, 75, 0.10);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

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

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

:focus-visible {
  outline: 3px solid var(--violet);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============ 通用 ============ */
.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: #a5b4fc;
}
.eyebrow.dark { color: var(--primary); }

.accent {
  background: linear-gradient(120deg, var(--primary), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 32px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  will-change: transform;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff;
  box-shadow: 0 12px 30px rgba(79, 70, 229, 0.38);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px rgba(79, 70, 229, 0.46); }
.btn-ghost {
  background: transparent;
  color: #eef2ff;
  border: 1px solid rgba(238, 242, 255, 0.35);
}
.btn-ghost:hover { border-color: rgba(238, 242, 255, 0.8); background: rgba(238, 242, 255, 0.06); }
.btn-gold {
  background: linear-gradient(135deg, #ffce4d, var(--gold-deep));
  color: #3b2c00;
  box-shadow: 0 12px 30px rgba(245, 179, 1, 0.35);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 16px 38px rgba(245, 179, 1, 0.45); }

/* ============ 导航 ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 5vw;
  transition: background 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
}
.nav.scrolled {
  background: rgba(11, 14, 31, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  padding: 12px 5vw;
  box-shadow: 0 8px 30px rgba(11, 14, 31, 0.35);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 6px 18px rgba(79, 70, 229, 0.45);
}
.brand-mark svg { width: 18px; height: 18px; }
.brand-name { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.nav-links { display: flex; gap: 34px; }
.nav-links a {
  font-size: 14px;
  color: rgba(238, 242, 255, 0.75);
  transition: color 0.2s ease;
}
.nav-links a:hover { color: #fff; }
.nav-login {
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 8px 22px rgba(79, 70, 229, 0.4);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.nav-login:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(79, 70, 229, 0.5); }

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--dark);
  color: #fff;
}
.hero-bg { position: absolute; inset: 0; }
.orb { position: absolute; border-radius: 50%; filter: blur(70px); }
.orb-a {
  width: 560px; height: 560px;
  top: -180px; right: -120px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.5), transparent 70%);
  animation: drift 14s ease-in-out infinite;
}
.orb-b {
  width: 480px; height: 480px;
  bottom: -160px; left: -140px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.42), transparent 70%);
  animation: drift 18s ease-in-out infinite reverse;
}
.orb-c {
  width: 260px; height: 260px;
  top: 30%; left: 52%;
  background: radial-gradient(circle, rgba(245, 179, 1, 0.16), transparent 70%);
  animation: drift 12s ease-in-out infinite;
}
@keyframes drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(40px, -30px); }
}
.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 255, 0.06) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 30%, transparent 75%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 5vw 80px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
}
.hero-title {
  margin: 18px 0 20px;
  font-size: clamp(40px, 6vw, 66px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: 2px;
}
.hero-sub {
  font-size: 17px;
  line-height: 1.9;
  color: rgba(226, 232, 255, 0.8);
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 30px;
  font-size: 13px;
  color: rgba(226, 232, 255, 0.62);
}
.dot {
  display: inline-block;
  width: 6px; height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--gold);
  vertical-align: middle;
}

/* Hero 视觉：堆叠卡片 */
.hero-visual {
  position: relative;
  min-height: 460px;
}
.stack-card {
  position: absolute;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.45);
  animation: floatCard 7s ease-in-out infinite;
}
@keyframes floatCard {
  0%, 100% { transform: translateY(0) rotate(var(--tilt, 0deg)); }
  50% { transform: translateY(-12px) rotate(var(--tilt, 0deg)); }
}
.card-course {
  --tilt: -3deg;
  top: 0; right: 4%;
  width: 300px;
  overflow: hidden;
  z-index: 3;
}
.card-media { position: relative; }
.card-media img { width: 100%; height: 170px; object-fit: cover; }
.badge-live {
  position: absolute;
  top: 12px; left: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: rgba(220, 38, 38, 0.9);
}
.card-body { padding: 14px 16px 18px; }
.card-title { font-size: 15px; font-weight: 700; color: var(--ink); }
.card-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.card-meta { display: flex; gap: 8px; margin-top: 10px; }
.bar { height: 6px; border-radius: 4px; background: #eef2ff; }
.bar.short { width: 40%; }

.card-cert {
  --tilt: 2deg;
  top: 34%; left: 0;
  width: 270px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  z-index: 2;
  animation-delay: 1.2s;
}
.cert-icon {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px; height: 46px;
  border-radius: 14px;
  color: var(--primary);
  background: #eef2ff;
}
.cert-icon svg { width: 24px; height: 24px; }

.card-chart {
  --tilt: -1.5deg;
  bottom: 0; right: 10%;
  width: 240px;
  padding: 18px;
  z-index: 4;
  animation-delay: 2.1s;
}
.chart-label { font-size: 12px; color: var(--muted); }
.chart-num { font-size: 30px; font-weight: 800; color: var(--primary-deep); margin: 2px 0 12px; }
.chart-num span { font-size: 15px; font-weight: 600; color: var(--muted); }
.chart-bars { display: flex; align-items: flex-end; gap: 8px; height: 54px; }
.chart-bars i {
  flex: 1;
  height: var(--h);
  border-radius: 4px 4px 2px 2px;
  background: linear-gradient(180deg, var(--violet), var(--primary));
  opacity: 0.85;
}

.scroll-hint {
  position: absolute;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid rgba(226, 232, 255, 0.4);
  border-radius: 14px;
  z-index: 5;
}
.scroll-hint span {
  position: absolute;
  top: 8px; left: 50%;
  width: 4px; height: 8px;
  margin-left: -2px;
  border-radius: 3px;
  background: rgba(226, 232, 255, 0.7);
  animation: wheel 1.8s ease-in-out infinite;
}
@keyframes wheel {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ============ 数据条 ============ */
.stats {
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 44px 5vw;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 38px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}
.stat-label { display: block; margin-top: 6px; font-size: 14px; color: var(--muted); }

/* ============ 区块通用 ============ */
.section-head { text-align: center; max-width: 640px; margin: 0 auto 52px; }
.section-title {
  margin-top: 12px;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: 1px;
}
.section-sub { margin-top: 14px; font-size: 15px; color: var(--muted); }

/* ============ 学习路径 ============ */
.path { padding: 96px 5vw; background: #fff; }
.path-steps {
  max-width: 1040px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  position: relative;
}
.path-steps::before {
  content: "";
  position: absolute;
  top: 42px; left: 12%; right: 12%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--primary) 0 8px, transparent 8px 16px);
  opacity: 0.35;
}
.step {
  position: relative;
  padding: 22px 24px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 16px;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.32);
  margin-bottom: 18px;
}
.step-title { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.step-desc { font-size: 14px; color: var(--muted); }

/* ============ 学习模块 ============ */
.modules { padding: 96px 5vw; }
.module-grid {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.module-card {
  padding: 34px 30px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.module-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.module-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  margin-bottom: 20px;
  border-radius: 16px;
  font-size: 20px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.3);
}
.module-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.module-desc { font-size: 14px; color: var(--muted); margin-bottom: 18px; }
.module-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: letter-spacing 0.2s ease;
}
.module-link:hover { letter-spacing: 1px; }

/* ============ VIP ============ */
.vip { padding: 96px 5vw; }
.vip-card {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 40px;
  padding: 56px 56px;
  border-radius: 28px;
  background:
    radial-gradient(circle at 85% 15%, rgba(245, 179, 1, 0.22), transparent 45%),
    linear-gradient(135deg, #171a30, #0b0e1f);
  color: #fff;
  box-shadow: 0 30px 70px rgba(11, 14, 31, 0.4);
}
.eyebrow.gold { color: var(--gold); }
.vip-title { margin: 14px 0 22px; font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; letter-spacing: 1px; }
.vip-title span {
  background: linear-gradient(120deg, #ffce4d, var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.vip-list { margin-bottom: 32px; }
.vip-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  font-size: 15px;
  color: rgba(241, 245, 255, 0.85);
}
.vip-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-weight: 800;
}
.vip-visual { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; }
.vip-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 140px; height: 140px;
  border-radius: 50%;
  color: #3b2c00;
  background: radial-gradient(circle at 30% 25%, #ffe08a, var(--gold) 70%);
  box-shadow: 0 20px 50px rgba(245, 179, 1, 0.4);
  animation: pulse 3.2s ease-in-out infinite;
}
.vip-badge svg { width: 60px; height: 60px; }
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.vip-motto {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 8px;
  color: var(--gold);
}

/* ============ 底部 CTA ============ */
.cta { padding: 0 5vw 96px; }
.cta-inner {
  position: relative;
  overflow: hidden;
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 40px;
  text-align: center;
  border-radius: 28px;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff;
  box-shadow: 0 30px 70px rgba(79, 70, 229, 0.35);
}
.cta-inner::before {
  content: "";
  position: absolute;
  top: -120px; right: -80px;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22), transparent 70%);
}
.cta-title { font-size: clamp(28px, 4.4vw, 42px); font-weight: 800; letter-spacing: 2px; }
.cta-sub { margin: 16px auto 32px; max-width: 460px; font-size: 15px; color: rgba(255, 255, 255, 0.85); }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 1; }
.cta-actions .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 14px 34px rgba(11, 14, 31, 0.25);
}
.cta-actions .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.55); }
.cta-actions .btn-ghost:hover { background: rgba(255, 255, 255, 0.1); }

/* ============ 页脚 ============ */
.footer {
  background: var(--dark);
  color: rgba(226, 232, 255, 0.6);
  padding: 56px 5vw 36px;
}
.footer-inner { max-width: 1080px; margin: 0 auto; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 1.25fr 0.9fr;
  gap: 48px;
  align-items: start;
}
.footer-col { min-width: 0; }
.footer-brand { font-size: 22px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.footer-slogan { margin-top: 6px; font-size: 13px; color: rgba(226, 232, 255, 0.5); }
.footer-head {
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #a5b4fc;
}
.footer-meta { margin-top: 10px; font-size: 13px; line-height: 1.8; color: rgba(226, 232, 255, 0.55); }
.footer-addr { margin-top: 14px; color: rgba(226, 232, 255, 0.4); }
.btn-trial {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 11px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.btn-trial svg { width: 16px; height: 16px; }
.btn-trial:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(79, 70, 229, 0.46); }
.footer-url {
  margin-top: 10px;
  font-size: 12px;
  color: rgba(148, 163, 255, 0.65);
  word-break: break-all;
}
/* 微信二维码卡片：占位文字与图片叠放，图片就绪后自动覆盖占位 */
.qr-box {
  position: relative;
  width: 108px;
  height: 108px;
  margin-top: 6px;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.35);
}
.qr-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 16px;
  object-fit: cover;
  z-index: 1;
}
.qr-img.qr-hidden { display: none; }
.qr-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  color: #475569;
}
.qr-empty span { font-size: 10px; font-weight: 400; color: #94a3b8; }
.footer-wechat .footer-meta { margin-top: 12px; }
.footer-copy {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid rgba(148, 163, 184, 0.14);
  text-align: center;
  font-size: 12px;
  color: rgba(226, 232, 255, 0.35);
}

/* ============ 滚动显现 ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; padding-top: 130px; }
  .hero-visual { min-height: 430px; margin: 0 auto; width: min(480px, 100%); }
  .path-steps, .module-grid { grid-template-columns: repeat(2, 1fr); }
  .vip-card { grid-template-columns: 1fr; padding: 44px 30px; text-align: center; }
  .vip-list li { text-align: left; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-col { text-align: center; }
  .qr-box { margin: 6px auto 0; }
  .btn-trial { margin-top: 16px; }
  .footer-url { margin-top: 10px; }
}

@media (max-width: 560px) {
  .nav-links { display: none; }
  .hero-inner { padding: 120px 6vw 90px; gap: 36px; }
  .hero-title { font-size: 36px; }
  .hero-sub { font-size: 15px; }
  .hero-actions .btn { width: 100%; }
  .hero-points { flex-direction: column; gap: 8px; }
  .hero-visual { min-height: 400px; }
  .card-course { width: 240px; }
  .card-cert { width: 220px; top: 30%; }
  .card-chart { width: 190px; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
  .path-steps { grid-template-columns: 1fr; }
  .path-steps::before { display: none; }
  .module-grid { grid-template-columns: 1fr; }
  .section-head { margin-bottom: 38px; }
  .path, .modules, .vip { padding: 70px 5vw; }
  .cta-inner { padding: 56px 26px; }
}

/* ============ 动效偏好：减少动画 ============ */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}