/* ============================================
   智域九重天官网 - 统一样式表
   东方玄幻·暗夜星河风格
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  /* 主题色 */
  --color-bg-deep: #0F0A1F;
  --color-bg-mid: #1E1B4B;
  --color-bg-light: #2D2A5E;
  --color-primary: #A78BFA;
  --color-accent-cyan: #22D3EE;
  --color-accent-gold: #FBBF24;
  --color-accent-pink: #FB7185;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-muted: rgba(255, 255, 255, 0.5);
  --color-text-gray: #666680;
  --color-border-subtle: rgba(167, 139, 250, 0.2);
  --color-border-glow: rgba(167, 139, 250, 0.4);

  /* 毛玻璃 */
  --glass-bg: rgba(20, 18, 28, 0.5);
  --glass-bg-strong: rgba(30, 27, 75, 0.7);
  --glass-blur: 24px;

  /* 字体 */
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* 间距 */
  --space-section: 120px;
  --space-content-max: 1200px;
  --radius-card: 28px;
  --radius-button: 99px;

  /* 渐变 */
  --gradient-aurora: linear-gradient(135deg, #1E1B4B 0%, #2D2A5E 50%, #1E1B4B 100%);
  --gradient-cta: linear-gradient(135deg, #A78BFA 0%, #22D3EE 100%);
  --gradient-gold: linear-gradient(135deg, #FBBF24 0%, #FB7185 100%);
}

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-deep);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 全局背景：深紫夜空 + 极光渐变 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(167, 139, 250, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 20% 30%, rgba(34, 211, 238, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 70%, rgba(251, 191, 36, 0.06) 0%, transparent 50%),
    var(--color-bg-deep);
  z-index: -1;
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-cyan);
}

img {
  max-width: 100%;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* ---------- 通用工具类 ---------- */
.container {
  max-width: var(--space-content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--space-section) 0;
  position: relative;
}

.text-center {
  text-align: center;
}

.gradient-text {
  background: var(--gradient-cta);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.gradient-text-gold {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 霓虹发光文字 */
.neon-cyan {
  color: var(--color-accent-cyan);
  text-shadow:
    0 0 20px rgba(34, 211, 238, 0.4),
    0 0 40px rgba(34, 211, 238, 0.2);
}

.neon-gold {
  color: var(--color-accent-gold);
  text-shadow:
    0 0 80px rgba(251, 191, 36, 0.1),
    0 0 40px rgba(251, 191, 36, 0.25),
    0 0 20px rgba(251, 191, 36, 0.5),
    0 0 10px rgba(251, 191, 36, 0.8),
    0 0 4px rgba(251, 191, 36, 1);
}

.neon-purple {
  color: var(--color-primary);
  text-shadow:
    0 0 20px rgba(167, 139, 250, 0.5),
    0 0 40px rgba(167, 139, 250, 0.3);
}

/* 毛玻璃卡片 */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-card);
  padding: 32px;
  transition: all 0.3s ease;
}

.glass-card:hover {
  border-color: var(--color-border-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 48px rgba(167, 139, 250, 0.2);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-cta);
  color: var(--color-text-primary);
  box-shadow: 0 8px 24px rgba(167, 139, 250, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(167, 139, 250, 0.6);
  color: var(--color-text-primary);
}

.btn-ghost {
  background: rgba(30, 27, 75, 0.6);
  color: var(--color-primary);
  border: 1px solid rgba(167, 139, 250, 0.6);
  box-shadow: inset 0 0 16px rgba(167, 139, 250, 0.3);
}

.btn-ghost:hover {
  background: rgba(30, 27, 75, 0.8);
  border-color: var(--color-primary);
  color: var(--color-text-primary);
}

.btn-large {
  padding: 20px 40px;
  font-size: 18px;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(15, 10, 31, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
}

.nav-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 0 16px rgba(167, 139, 250, 0.3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-menu a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-text-primary);
}

.nav-menu a.active::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-cta);
  border-radius: 2px;
}

.nav-cta {
  padding: 10px 24px;
  font-size: 14px;
  background: var(--gradient-cta);
  color: var(--color-text-primary);
  border-radius: var(--radius-button);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all 0.3s ease;
}

/* ---------- Hero 区 ---------- */
.hero {
  padding-top: 160px;
  padding-bottom: 80px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-bg-orb.purple {
  width: 500px;
  height: 500px;
  background: rgba(167, 139, 250, 0.2);
  top: -100px;
  left: -100px;
}

.hero-bg-orb.cyan {
  width: 400px;
  height: 400px;
  background: rgba(34, 211, 238, 0.15);
  bottom: -100px;
  right: -100px;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 99px;
  font-size: 13px;
  color: var(--color-accent-cyan);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 64px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual-card {
  width: 100%;
  height: 100%;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-card);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-character {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-card);
  position: relative;
  z-index: 1;
}

.hero-visual-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 50%, rgba(15, 10, 31, 0.6) 100%);
  z-index: 2;
  pointer-events: none;
}

/* ---------- 数据亮点 ---------- */
.stats-section {
  padding: 60px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 32px 16px;
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* ---------- 板块标题 ---------- */
.section-label {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent-cyan);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 42px;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 64px;
  max-width: 600px;
}

/* ---------- 玩法卡片 ---------- */
.gameplay-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.gameplay-card {
  padding: 40px 32px;
}

.gameplay-icon {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  background: rgba(167, 139, 250, 0.1);
  border: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  overflow: hidden;
  font-size: 0;
}

.gameplay-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 16px;
  transition: transform 0.3s ease;
}

.gameplay-card:hover .gameplay-icon img {
  transform: scale(1.08);
}

.gameplay-card h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.gameplay-card p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.gameplay-features {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gameplay-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.gameplay-features li::before {
  content: "◆";
  color: var(--color-accent-cyan);
  font-size: 10px;
}

/* ---------- 玩法说明页（左右交替布局）---------- */
.gameplay-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 120px;
}

.gameplay-row.reverse {
  direction: rtl;
}

.gameplay-row.reverse > * {
  direction: ltr;
}

.gameplay-row-number {
  font-family: var(--font-serif);
  font-size: 120px;
  font-weight: 900;
  color: var(--color-primary);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 16px;
}

.gameplay-row h3 {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 600;
  margin-bottom: 16px;
}

.gameplay-row-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.gameplay-row-visual {
  height: 400px;
  border-radius: var(--radius-card);
  background: var(--glass-bg-strong);
  border: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* ---------- 学科覆盖 ---------- */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.subject-chip {
  padding: 16px 24px;
  background: var(--glass-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: 16px;
  text-align: center;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.subject-chip:hover {
  border-color: var(--color-primary);
  background: rgba(167, 139, 250, 0.1);
}

/* ---------- 家长安心区 ---------- */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.trust-card {
  padding: 32px;
}

.trust-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(34, 211, 238, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}

.trust-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.trust-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- Final CTA 区 ---------- */
.final-cta {
  padding: 100px 0;
  text-align: center;
  background: var(--gradient-aurora);
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% 50%, rgba(167, 139, 250, 0.2) 0%, transparent 60%);
  pointer-events: none;
}

.final-cta-content {
  position: relative;
  z-index: 1;
}

.final-cta-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent-cyan);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.final-cta-title {
  font-family: var(--font-serif);
  font-size: 42px;
  font-weight: 600;
  margin-bottom: 16px;
}

.final-cta-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
}

/* ---------- 二维码区块 ---------- */
.qr-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
}

.qr-code-frame {
  width: 160px;
  height: 160px;
  background: #FFFFFF;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-code-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.qr-validity-text {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ---------- Footer ---------- */
.footer {
  background: rgba(20, 18, 28, 0.8);
  border-top: 1px solid rgba(77, 69, 128, 0.3);
  padding: 60px 0 40px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.footer-main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
}

.footer-brand-tagline {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.footer-divider {
  height: 1px;
  background: rgba(77, 69, 128, 0.3);
  margin: 0 0 24px;
}

.footer-copyright {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-gray);
}

/* ---------- 玩家中心 ---------- */
.player-card {
  padding: 48px;
  margin-bottom: 48px;
  text-align: center;
}

.player-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gradient-cta);
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  font-family: var(--font-serif);
  font-weight: 700;
}

.player-name {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.player-title-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(251, 191, 36, 0.15);
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: 99px;
  font-size: 13px;
  color: var(--color-accent-gold);
  margin-bottom: 16px;
}

.player-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.stat-mini-card {
  padding: 32px 24px;
  text-align: center;
}

.stat-mini-number {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 8px;
}

.stat-mini-label {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}

.achievement-badge {
  aspect-ratio: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 8px;
}

.achievement-icon {
  font-size: 32px;
}

.achievement-name {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.leaderboard {
  overflow: hidden;
  padding: 0;
}

.leaderboard-header {
  padding: 24px 32px;
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.leaderboard-list {
  padding: 16px 0;
}

.leaderboard-row {
  display: grid;
  grid-template-columns: 60px 1fr 100px 100px 120px;
  gap: 16px;
  padding: 16px 32px;
  align-items: center;
  font-size: 14px;
}

.leaderboard-row.header {
  font-size: 12px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 32px;
  background: rgba(167, 139, 250, 0.05);
}

.leaderboard-row.self {
  background: rgba(167, 139, 250, 0.1);
  border-left: 3px solid var(--color-primary);
}

.rank {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
}

.rank-1 { color: var(--color-accent-gold); }
.rank-2 { color: #C0C0C0; }
.rank-3 { color: #CD7F32; }

/* ---------- 公告反馈页 ---------- */
.tab-container {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.tab {
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab.active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.announcement-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.announcement-item:last-child {
  border-bottom: none;
}

.announcement-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 500;
  margin-right: 12px;
}

.tag-update {
  background: rgba(34, 211, 238, 0.15);
  color: var(--color-accent-cyan);
}

.tag-event {
  background: rgba(251, 191, 36, 0.15);
  color: var(--color-accent-gold);
}

.tag-notice {
  background: rgba(251, 113, 133, 0.15);
  color: var(--color-accent-pink);
}

.announcement-title {
  display: inline;
  font-size: 16px;
  font-weight: 600;
}

.announcement-date {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-left: 12px;
}

.announcement-excerpt {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- 反馈表单 ---------- */
.feedback-form {
  padding: 48px;
}

.feedback-form h2 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feedback-form-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text-secondary);
}

.chip-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.chip {
  padding: 10px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: 99px;
  font-size: 14px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.chip:hover {
  border-color: var(--color-primary);
}

.chip.selected {
  background: rgba(167, 139, 250, 0.15);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 20px;
  background: rgba(15, 10, 31, 0.5);
  border: 1px solid var(--color-border-subtle);
  border-radius: 12px;
  font-size: 15px;
  color: var(--color-text-primary);
  font-family: inherit;
  transition: all 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.6;
}

/* ---------- Page Hero（子页面用）---------- */
.page-hero {
  padding: 180px 0 80px;
  text-align: center;
  position: relative;
}

.page-hero-label {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent-cyan);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.page-hero-title {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 700;
  margin-bottom: 16px;
}

.page-hero-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   响应式：平板（<= 1024px）
   ============================================ */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-title {
    font-size: 48px;
  }

  .gameplay-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gameplay-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .gameplay-row.reverse {
    direction: ltr;
  }

  .gameplay-row-visual {
    height: 300px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .player-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .achievements-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .leaderboard-row {
    grid-template-columns: 50px 1fr 80px 90px;
    font-size: 13px;
  }

  .leaderboard-row > :nth-child(5) {
    display: none;
  }
}

/* ============================================
   响应式：移动端（<= 768px）
   ============================================ */
@media (max-width: 768px) {
  :root {
    --space-section: 64px;
    --radius-card: 20px;
  }

  /* 导航栏：汉堡菜单 */
  .nav-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(15, 10, 31, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  /* Hero */
  .hero {
    padding-top: 120px;
    min-height: auto;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-visual {
    height: 300px;
  }

  /* 标题字号 */
  .section-title {
    font-size: 28px;
  }

  .page-hero-title {
    font-size: 36px;
  }

  .final-cta-title {
    font-size: 28px;
  }

  /* 网格全部单列 */
  .gameplay-grid,
  .stats-grid,
  .subjects-grid,
  .trust-grid,
  .player-stats-grid {
    grid-template-columns: 1fr;
  }

  .achievements-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 排行榜简化 */
  .leaderboard-row {
    grid-template-columns: 40px 1fr 80px;
    padding: 12px 16px;
    font-size: 13px;
  }

  .leaderboard-row > :nth-child(4),
  .leaderboard-row > :nth-child(5) {
    display: none;
  }

  /* 卡片内边距减小 */
  .glass-card,
  .gameplay-card,
  .trust-card,
  .player-card,
  .feedback-form {
    padding: 24px 20px;
  }

  /* 二维码稍小 */
  .qr-code-frame {
    width: 140px;
    height: 140px;
  }

  /* Footer 单列 */
  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* 反馈表单 chip 全宽 */
  .chip-group .chip {
    flex: 1;
    text-align: center;
    min-width: calc(50% - 6px);
  }

  .btn-large {
    padding: 16px 28px;
    font-size: 16px;
  }
}

/* ============================================
   响应式：小屏手机（<= 480px）
   ============================================ */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 28px;
  }

  .section-title {
    font-size: 24px;
  }

  .page-hero-title {
    font-size: 28px;
  }

  .stat-number {
    font-size: 36px;
  }

  .achievements-grid {
    grid-template-columns: 1fr 1fr;
  }

  .nav-brand {
    font-size: 16px;
  }

  .nav-logo {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section > * {
  animation: fadeInUp 0.8s ease-out backwards;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.nav-cta {
  animation: pulse 3s ease-in-out infinite;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-deep);
}

::-webkit-scrollbar-thumb {
  background: rgba(167, 139, 250, 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(167, 139, 250, 0.5);
}