/* ============================================================
   砂岩风主样式表 - Sandstone Desert Style
   麻将竞技平台 | sandstone-main.css
   色彩体系：午夜黑 #6B4226 | 砂岩洋红 #D4A373 | 砂岩青 #E76F51
              深空蓝 #2A9D8F | 银灰 #1A1A1A
   字体：Amiri (标题) + Cairo (正文)
   ============================================================ */

/* --- 字体声明 --- */
@font-face {
  font-family: 'Amiri';
  src: url('../fonts/Amiri-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Amiri';
  src: url('../fonts/Amiri-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Cairo';
  src: url('../fonts/Cairo-Variable.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* --- CSS变量 --- */
:root {
  --sandstone-midnight: #6B4226;
  --sandstone-magenta: #D4A373;
  --sandstone-cyan: #E76F51;
  --sandstone-deepblue: #2A9D8F;
  --sandstone-silver: #1A1A1A;
  --sandstone-midnight-rgb: 107, 66, 38;
  --sandstone-magenta-rgb: 212, 163, 115;
  --sandstone-cyan-rgb: 231, 111, 81;
  --sandstone-deepblue-rgb: 42, 157, 143;
  --sandstone-silver-rgb: 26, 26, 26;
  --font-heading: 'Amiri', 'PingFang SC', sans-serif;
  --font-body: 'Cairo', 'Microsoft YaHei', sans-serif;
  --glow-magenta: 0 0 12px rgba(212,163,115,.6), 0 0 24px rgba(212,163,115,.3);
  --glow-cyan: 0 0 12px rgba(231,111,81,.6), 0 0 24px rgba(231,111,81,.3);
  --glow-deepblue: 0 0 12px rgba(42,157,143,.6), 0 0 24px rgba(42,157,143,.3);
}

/* --- 全局重置 --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background-color: var(--sandstone-midnight);
  color: #e0d5c8;
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* --- 背景电路纹理 --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(212,163,115,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212,163,115,.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* --- 数据流瀑布背景 (动画4) --- */
#dune-data-waterfall {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .08;
}

/* --- 排版 --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--sandstone-cyan);
  line-height: 1.3;
  margin-bottom: .6em;
}
h1 { font-size: clamp(1.8rem, 4vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 2rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
h5 { font-size: clamp(1rem, 1.5vw, 1.25rem); }
h6 { font-size: clamp(.95rem, 1.2vw, 1.1rem); }
p { margin-bottom: 1em; font-size: clamp(14px, 1.6vw, 17px); }
a { color: var(--sandstone-magenta); text-decoration: none; transition: color .3s, text-shadow .3s; }
a:hover { color: var(--sandstone-cyan); text-shadow: var(--glow-cyan); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { padding-left: 1.5em; margin-bottom: 1em; }
li { margin-bottom: .4em; }
li::marker { color: var(--sandstone-cyan); }

/* --- 页面容器 --- */
.sandstone-page-wrap { position: relative; z-index: 1; }
.sandstone-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================================
   导航栏 (非Sticky)
   ============================================================ */
.sandstone-nav-bar {
  position: relative;
  background: rgba(107,66,38,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--sandstone-magenta);
  z-index: 100;
}
.sandstone-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 20px;
  min-height: 64px;
}
.sandstone-logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.sandstone-logo-img {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  box-shadow: var(--glow-magenta);
}
.sandstone-logo-text {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--sandstone-magenta);
  text-shadow: var(--glow-magenta);
  white-space: nowrap;
}
.sandstone-nav-list {
  display: flex;
  list-style: none;
  gap: 4px;
  padding: 0;
  margin: 0;
}
.sandstone-nav-item a {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-heading);
  font-size: .95rem;
  color: #e0d5c8;
  border-radius: 4px;
  transition: background .3s, color .3s, box-shadow .3s;
  white-space: nowrap;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
}
.sandstone-nav-item a:hover {
  color: var(--sandstone-cyan);
  background: rgba(231,111,81,.1);
  text-shadow: var(--glow-cyan);
}
.sandstone-nav-item.sandstone-active a {
  color: var(--sandstone-cyan);
  background: rgba(231,111,81,.15);
  box-shadow: inset 0 -2px 0 var(--sandstone-cyan), var(--glow-cyan);
  animation: sandstone-pulse-subtle 2s infinite;
}
@keyframes sandstone-pulse-subtle {
  0%, 100% { box-shadow: inset 0 -2px 0 var(--sandstone-cyan), 0 0 8px rgba(231,111,81,.3); }
  50% { box-shadow: inset 0 -2px 0 var(--sandstone-cyan), 0 0 16px rgba(231,111,81,.5); }
}

/* 移动端菜单按钮 */
.sandstone-menu-toggle {
  display: none;
  background: none;
  border: 2px solid var(--sandstone-magenta);
  border-radius: 6px;
  padding: 8px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}
.sandstone-menu-toggle span {
  display: block;
  width: 22px;
  height: 3px;
  background: var(--sandstone-magenta);
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
  box-shadow: 0 0 6px rgba(212,163,115,.5);
}
.sandstone-menu-toggle span + span { margin-top: 5px; }
.sandstone-menu-toggle.sandstone-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.sandstone-menu-toggle.sandstone-open span:nth-child(2) { opacity: 0; }
.sandstone-menu-toggle.sandstone-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ============================================================
   Hero 模块
   ============================================================ */
.sandstone-hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.sandstone-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.sandstone-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sandstone-hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(107,66,38,.72);
  z-index: 1;
}
.sandstone-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  padding: 40px 20px;
}
.sandstone-hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--sandstone-cyan);
  text-shadow: 0 0 20px rgba(231,111,81,.6), 0 0 40px rgba(231,111,81,.3);
  margin-bottom: .3em;
  animation: sandstone-neon-flicker 4s infinite;
}
.sandstone-hero-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.4rem);
  color: #c8bfb4;
  margin-bottom: 1.5em;
}
.sandstone-hero-text {
  font-size: clamp(14px, 1.5vw, 16px);
  color: #b8afa5;
  margin-bottom: 2em;
  line-height: 1.8;
}
.sandstone-hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   按钮系统
   ============================================================ */
.sandstone-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: var(--sandstone-magenta);
  color: var(--sandstone-midnight);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: transform .3s, box-shadow .3s;
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.sandstone-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-magenta);
  color: var(--sandstone-midnight);
}
.sandstone-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: transparent;
  color: var(--sandstone-cyan);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  border: 2px solid var(--sandstone-cyan);
  border-radius: 4px;
  cursor: pointer;
  transition: transform .3s, box-shadow .3s, border-color .3s;
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
}
.sandstone-btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-cyan);
  color: var(--sandstone-cyan);
}

/* 脉冲波纹动画 (动画3) */
.sandstone-btn-primary::after,
.sandstone-btn-secondary::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity .3s;
}
.sandstone-btn-primary:hover::after {
  animation: sandstone-pulse-ripple .6s ease-out;
}
@keyframes sandstone-pulse-ripple {
  0% { box-shadow: 0 0 0 0 rgba(212,163,115,.5); opacity: 1; }
  100% { box-shadow: 0 0 0 20px rgba(212,163,115,0); opacity: 0; }
}

/* ============================================================
   砂岩卡片系统
   ============================================================ */
.sandstone-card {
  background: rgba(42,157,143,.12);
  border: 1px solid rgba(212,163,115,.25);
  border-radius: 2px;
  padding: 24px;
  transition: transform .3s, box-shadow .3s, border-color .3s;
  position: relative;
  overflow: hidden;
}
.sandstone-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--sandstone-magenta), transparent);
  opacity: .6;
}
.sandstone-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow-magenta);
  border-color: var(--sandstone-magenta);
}
.sandstone-card-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 2px;
  margin-bottom: 16px;
  border: 1px solid rgba(231,111,81,.2);
}
.sandstone-card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--sandstone-cyan);
  margin-bottom: .4em;
}
.sandstone-card-meta {
  font-size: .85rem;
  color: var(--sandstone-magenta);
  margin-bottom: .6em;
}
.sandstone-card-desc {
  font-size: .92rem;
  color: #b8afa5;
  line-height: 1.6;
}

/* ============================================================
   六大游戏殿堂网格
   ============================================================ */
.sandstone-game-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ============================================================
   模块区段
   ============================================================ */
.sandstone-section {
  padding: 80px 0;
  position: relative;
}
.sandstone-section-alt {
  background: rgba(42,157,143,.06);
}
.sandstone-section-title {
  text-align: center;
  margin-bottom: .3em;
  position: relative;
}
.sandstone-section-subtitle {
  text-align: center;
  color: #a09888;
  font-size: clamp(14px, 1.5vw, 16px);
  margin-bottom: 2.5em;
}
.sandstone-section-divider {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--sandstone-magenta), var(--sandstone-cyan));
  margin: 0 auto 2em;
  box-shadow: var(--glow-magenta);
}

/* ============================================================
   试玩区模块
   ============================================================ */
.sandstone-trial-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}
.sandstone-trial-sidebar {
  background: rgba(42,157,143,.1);
  border: 1px solid rgba(212,163,115,.2);
  border-radius: 2px;
  padding: 16px;
}
.sandstone-trial-tab {
  display: block;
  width: 100%;
  padding: 12px 16px;
  background: transparent;
  border: none;
  color: #b8afa5;
  font-family: var(--font-body);
  font-size: .95rem;
  text-align: left;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all .3s;
  min-height: 44px;
}
.sandstone-trial-tab:hover,
.sandstone-trial-tab.sandstone-active {
  color: var(--sandstone-magenta);
  border-left-color: var(--sandstone-magenta);
  background: rgba(212,163,115,.08);
}
.sandstone-trial-screen {
  background: rgba(26,26,26,.5);
  border: 2px solid var(--sandstone-magenta);
  border-radius: 2px;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: var(--glow-magenta);
}
.sandstone-trial-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
   影院频道模块
   ============================================================ */
.sandstone-cinema-screen {
  background: rgba(26,26,26,.6);
  border: 2px solid var(--sandstone-deepblue);
  border-radius: 2px;
  padding: 4px;
  margin-bottom: 24px;
  box-shadow: var(--glow-deepblue);
}
.sandstone-cinema-screen img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: 2px;
}
.sandstone-cinema-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.sandstone-cinema-thumb {
  background: rgba(42,157,143,.1);
  border: 1px solid rgba(231,111,81,.2);
  border-radius: 2px;
  padding: 12px;
  cursor: pointer;
  transition: border-color .3s, box-shadow .3s;
}
.sandstone-cinema-thumb:hover {
  border-color: var(--sandstone-cyan);
  box-shadow: var(--glow-cyan);
}

/* ============================================================
   注册模块
   ============================================================ */
.sandstone-register-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.sandstone-form-group {
  margin-bottom: 20px;
}
.sandstone-form-label {
  display: block;
  font-size: .9rem;
  color: var(--sandstone-magenta);
  margin-bottom: 6px;
}
.sandstone-form-input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(42,157,143,.1);
  border: none;
  border-bottom: 2px solid var(--sandstone-deepblue);
  color: #e0d5c8;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color .3s, box-shadow .3s;
  min-height: 44px;
}
.sandstone-form-input:focus {
  outline: none;
  border-bottom-color: var(--sandstone-magenta);
  box-shadow: 0 2px 8px rgba(212,163,115,.3);
  animation: sandstone-neon-flicker .5s;
}

/* ============================================================
   充值模块
   ============================================================ */
.sandstone-promo-billboard {
  background: linear-gradient(135deg, rgba(212,163,115,.15), rgba(231,111,81,.1));
  border: 2px solid var(--sandstone-magenta);
  border-radius: 2px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: var(--glow-magenta);
  position: relative;
  overflow: hidden;
}
.sandstone-promo-billboard::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 0deg, transparent, rgba(212,163,115,.05), transparent, rgba(231,111,81,.05), transparent);
  animation: sandstone-rotate-glow 8s linear infinite;
}
@keyframes sandstone-rotate-glow {
  to { transform: rotate(360deg); }
}
.sandstone-promo-tiers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 32px 0;
  position: relative;
  z-index: 1;
}
.sandstone-promo-tier {
  background: rgba(107,66,38,.6);
  border: 1px solid rgba(212,163,115,.3);
  border-radius: 2px;
  padding: 24px 16px;
  text-align: center;
}
.sandstone-promo-tier-title {
  font-family: var(--font-heading);
  color: var(--sandstone-magenta);
  font-size: 1.1rem;
  margin-bottom: .5em;
}
.sandstone-promo-tier-desc {
  font-size: .9rem;
  color: #b8afa5;
}

/* ============================================================
   活动广场模块
   ============================================================ */
.sandstone-event-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.sandstone-event-card {
  background: rgba(42,157,143,.08);
  border: 1px solid rgba(231,111,81,.2);
  border-radius: 2px;
  padding: 24px;
  transition: transform .3s, box-shadow .3s;
}
.sandstone-event-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--glow-cyan);
}
.sandstone-event-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(231,111,81,.15);
  color: var(--sandstone-cyan);
  font-size: .8rem;
  border-radius: 2px;
  margin-bottom: 12px;
}
.sandstone-event-title {
  font-family: var(--font-heading);
  color: var(--sandstone-magenta);
  font-size: 1.1rem;
  margin-bottom: .5em;
}

/* ============================================================
   VIP摩天楼模块
   ============================================================ */
.sandstone-vip-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.sandstone-vip-tower {
  position: relative;
}
.sandstone-vip-tower img {
  width: 100%;
  border-radius: 2px;
  border: 1px solid rgba(212,163,115,.2);
}
.sandstone-vip-levels {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.sandstone-vip-level-card {
  background: rgba(42,157,143,.1);
  border-left: 3px solid var(--sandstone-magenta);
  padding: 16px 20px;
  transition: background .3s, border-color .3s;
  cursor: pointer;
}
.sandstone-vip-level-card:hover {
  background: rgba(42,157,143,.2);
  border-left-color: var(--sandstone-cyan);
}
.sandstone-vip-level-name {
  font-family: var(--font-heading);
  color: var(--sandstone-cyan);
  font-size: 1rem;
  margin-bottom: .3em;
}
.sandstone-vip-level-desc {
  font-size: .88rem;
  color: #b8afa5;
}

/* ============================================================
   安全认证模块
   ============================================================ */
.sandstone-security-center {
  text-align: center;
}
.sandstone-security-badges {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.sandstone-security-badge {
  width: 120px;
  text-align: center;
}
.sandstone-security-badge img {
  width: 80px;
  height: 80px;
  margin: 0 auto 12px;
  filter: drop-shadow(0 0 8px rgba(212,163,115,.4));
}
.sandstone-security-badge span {
  display: block;
  font-size: .85rem;
  color: var(--sandstone-magenta);
}
.sandstone-security-text {
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
  line-height: 1.8;
}

/* ============================================================
   负责任博弈模块
   ============================================================ */
.sandstone-curfew-section {
  background: rgba(26,26,26,.4);
  border-top: 1px solid rgba(212,163,115,.15);
  padding: 60px 0;
}
.sandstone-curfew-layout {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 32px;
  align-items: start;
}
.sandstone-age-badge {
  width: 80px;
  height: 80px;
  border: 3px solid var(--sandstone-magenta);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--sandstone-magenta);
  box-shadow: var(--glow-magenta);
  flex-shrink: 0;
}
.sandstone-curfew-text {
  line-height: 1.8;
}
.sandstone-curfew-actions {
  display: flex;
  gap: 16px;
  margin-top: 20px;
  flex-wrap: wrap;
}

/* ============================================================
   面包屑导航
   ============================================================ */
.sandstone-breadcrumb {
  padding: 16px 0;
  font-size: .88rem;
}
.sandstone-breadcrumb a {
  color: var(--sandstone-magenta);
}
.sandstone-breadcrumb span {
  color: #a09888;
  margin: 0 8px;
}
.sandstone-breadcrumb-current {
  color: var(--sandstone-cyan);
}

/* ============================================================
   内页Hero
   ============================================================ */
.sandstone-inner-hero {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.sandstone-inner-hero-bg {
  position: absolute;
  inset: 0;
}
.sandstone-inner-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sandstone-inner-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(107,66,38,.8) 0%, rgba(107,66,38,.95) 100%);
}
.sandstone-inner-hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 60px 20px 40px;
}

/* ============================================================
   内页内容区
   ============================================================ */
.sandstone-content-section {
  padding: 60px 0;
}
.sandstone-content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 48px;
}
.sandstone-content-grid.sandstone-reverse {
  direction: rtl;
}
.sandstone-content-grid.sandstone-reverse > * {
  direction: ltr;
}
.sandstone-content-img {
  width: 100%;
  border-radius: 2px;
  border: 1px solid rgba(212,163,115,.2);
  box-shadow: 0 4px 20px rgba(0,0,0,.3);
}
.sandstone-game-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 32px 0;
}
.sandstone-stat-card {
  background: rgba(42,157,143,.1);
  border: 1px solid rgba(212,163,115,.2);
  border-radius: 2px;
  padding: 20px;
  text-align: center;
}
.sandstone-stat-value {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--sandstone-magenta);
  text-shadow: var(--glow-magenta);
}
.sandstone-stat-label {
  font-size: .85rem;
  color: #a09888;
  margin-top: 4px;
}

/* ============================================================
   FAQ手风琴
   ============================================================ */
.sandstone-faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.sandstone-faq-item {
  border-bottom: 1px solid rgba(212,163,115,.15);
}
.sandstone-faq-question {
  width: 100%;
  padding: 18px 0;
  background: none;
  border: none;
  color: var(--sandstone-magenta);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 44px;
}
.sandstone-faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--sandstone-cyan);
  transition: transform .3s;
}
.sandstone-faq-item.sandstone-open .sandstone-faq-question::after {
  transform: rotate(45deg);
}
.sandstone-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease;
  color: #b8afa5;
  font-size: .95rem;
  line-height: 1.7;
}
.sandstone-faq-item.sandstone-open .sandstone-faq-answer {
  max-height: 300px;
  padding-bottom: 18px;
}

/* ============================================================
   APP下载页
   ============================================================ */
.sandstone-download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.sandstone-download-card {
  background: rgba(42,157,143,.1);
  border: 1px solid rgba(212,163,115,.25);
  border-radius: 2px;
  padding: 32px;
  text-align: center;
}
.sandstone-qr-img {
  width: 180px;
  height: 180px;
  margin: 0 auto 20px;
  border: 2px solid var(--sandstone-magenta);
  border-radius: 4px;
  box-shadow: var(--glow-magenta);
}

/* ============================================================
   竞技大厅游戏网格
   ============================================================ */
.sandstone-lobby-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.sandstone-lobby-filter {
  display: flex;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.sandstone-filter-btn {
  padding: 10px 20px;
  background: rgba(42,157,143,.1);
  border: 1px solid rgba(231,111,81,.2);
  color: #b8afa5;
  font-family: var(--font-body);
  font-size: .9rem;
  cursor: pointer;
  transition: all .3s;
  min-height: 44px;
  border-radius: 2px;
}
.sandstone-filter-btn:hover,
.sandstone-filter-btn.sandstone-active {
  background: rgba(231,111,81,.15);
  border-color: var(--sandstone-cyan);
  color: var(--sandstone-cyan);
}

/* ============================================================
   页脚
   ============================================================ */
.sandstone-footer {
  background: rgba(26,26,26,.5);
  border-top: 2px solid var(--sandstone-magenta);
  padding: 60px 0 30px;
}
.sandstone-footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}
.sandstone-footer-title {
  font-family: var(--font-heading);
  color: var(--sandstone-magenta);
  font-size: 1.05rem;
  margin-bottom: 16px;
}
.sandstone-footer-links {
  list-style: none;
  padding: 0;
}
.sandstone-footer-links li {
  margin-bottom: 8px;
}
.sandstone-footer-links a {
  color: #a09888;
  font-size: .9rem;
  transition: color .3s;
}
.sandstone-footer-links a:hover {
  color: var(--sandstone-cyan);
}
.sandstone-footer-social {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}
.sandstone-footer-social a {
  width: 40px;
  height: 40px;
  border: 1px solid rgba(212,163,115,.3);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sandstone-magenta);
  font-size: .8rem;
  transition: all .3s;
}
.sandstone-footer-social a:hover {
  border-color: var(--sandstone-cyan);
  color: var(--sandstone-cyan);
  box-shadow: var(--glow-cyan);
}
.sandstone-footer-bottom {
  border-top: 1px solid rgba(212,163,115,.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.sandstone-footer-license {
  font-size: .85rem;
  color: #a09888;
}
.sandstone-footer-payments {
  display: flex;
  gap: 12px;
  align-items: center;
}
.sandstone-footer-payments span {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid rgba(212,163,115,.2);
  border-radius: 2px;
  font-size: .75rem;
  color: #a09888;
}
.sandstone-footer-18plus {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  width: 100%;
}
.sandstone-footer-age-icon {
  width: 40px;
  height: 40px;
  border: 2px solid var(--sandstone-magenta);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--sandstone-magenta);
  flex-shrink: 0;
}
.sandstone-footer-age-text {
  font-size: .8rem;
  color: #8a8070;
}

/* ============================================================
   动画1：砂岩闪烁 (Neon Flicker)
   ============================================================ */
@keyframes sandstone-neon-flicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% {
    text-shadow: 0 0 20px rgba(231,111,81,.6), 0 0 40px rgba(231,111,81,.3);
    opacity: 1;
  }
  20%, 24%, 55% {
    text-shadow: none;
    opacity: .85;
  }
}

/* ============================================================
   动画2：全息投影显现 (Hologram Reveal)
   ============================================================ */
.sandstone-hologram-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s ease, transform .8s ease;
  filter: blur(2px);
}
.sandstone-hologram-reveal.sandstone-revealed {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
  animation: sandstone-glitch-reveal .8s ease forwards;
}
@keyframes sandstone-glitch-reveal {
  0% { clip-path: inset(0 0 100% 0); filter: hue-rotate(90deg) blur(2px); }
  30% { clip-path: inset(0 0 60% 0); filter: hue-rotate(45deg) blur(1px); }
  60% { clip-path: inset(0 0 20% 0); filter: hue-rotate(15deg) blur(0); }
  100% { clip-path: inset(0 0 0 0); filter: hue-rotate(0deg) blur(0); }
}

/* ============================================================
   动画3：脉冲波纹 (Pulse Ripple) - 卡片悬停
   ============================================================ */
.sandstone-card:hover {
  animation: sandstone-card-pulse .6s ease;
}
@keyframes sandstone-card-pulse {
  0% { box-shadow: 0 0 0 0 rgba(212,163,115,.4); }
  50% { box-shadow: 0 0 0 12px rgba(212,163,115,.1); }
  100% { box-shadow: 0 0 0 0 rgba(212,163,115,0); }
}

/* ============================================================
   响应式设计
   ============================================================ */
@media (max-width: 1280px) {
  .sandstone-game-grid { grid-template-columns: repeat(3, 1fr); }
  .sandstone-lobby-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 1024px) {
  .sandstone-game-grid { grid-template-columns: repeat(2, 1fr); }
  .sandstone-lobby-grid { grid-template-columns: repeat(2, 1fr); }
  .sandstone-footer-grid { grid-template-columns: repeat(2, 1fr); }
  .sandstone-vip-layout { grid-template-columns: 1fr; }
  .sandstone-register-grid { grid-template-columns: 1fr; }
  .sandstone-content-grid { grid-template-columns: 1fr; }
  .sandstone-content-grid.sandstone-reverse { direction: ltr; }
  .sandstone-promo-tiers { grid-template-columns: 1fr; }
  .sandstone-game-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .sandstone-nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(107,66,38,.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px;
    border-bottom: 2px solid var(--sandstone-magenta);
  }
  .sandstone-nav-list.sandstone-nav-open {
    display: flex;
  }
  .sandstone-menu-toggle {
    display: flex;
  }
  .sandstone-hero-title { font-size: clamp(1.6rem, 6vw, 2.4rem); }
  .sandstone-trial-layout { grid-template-columns: 1fr; }
  .sandstone-cinema-list { grid-template-columns: 1fr; }
  .sandstone-event-grid { grid-template-columns: 1fr; }
  .sandstone-download-grid { grid-template-columns: 1fr; }
  .sandstone-lobby-grid { grid-template-columns: repeat(2, 1fr); }
  .sandstone-curfew-layout { grid-template-columns: 1fr; }
  .sandstone-curfew-layout .sandstone-age-badge { margin: 0 auto; }
  .sandstone-section { padding: 50px 0; }
}
@media (max-width: 480px) {
  .sandstone-game-grid { grid-template-columns: 1fr; }
  .sandstone-lobby-grid { grid-template-columns: 1fr; }
  .sandstone-footer-grid { grid-template-columns: 1fr; }
  .sandstone-game-stats { grid-template-columns: 1fr; }
  .sandstone-security-badges { flex-direction: column; align-items: center; }
}

/* ============================================================
   工具类
   ============================================================ */
.sandstone-text-center { text-align: center; }
.sandstone-text-magenta { color: var(--sandstone-magenta); }
.sandstone-text-cyan { color: var(--sandstone-cyan); }
.sandstone-text-silver { color: #a09888; }
.sandstone-mt-1 { margin-top: 8px; }
.sandstone-mt-2 { margin-top: 16px; }
.sandstone-mt-3 { margin-top: 24px; }
.sandstone-mb-1 { margin-bottom: 8px; }
.sandstone-mb-2 { margin-bottom: 16px; }
.sandstone-mb-3 { margin-bottom: 24px; }
.sandstone-glow-text { text-shadow: var(--glow-magenta); }
.sandstone-hidden { display: none !important; }

/* 内页图片画廊 */
.sandstone-gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 32px 0;
}
.sandstone-gallery-grid img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid rgba(212,163,115,.2);
  border-radius: 2px;
  transition: transform .3s, box-shadow .3s;
}
.sandstone-gallery-grid img:hover {
  transform: scale(1.02);
  box-shadow: var(--glow-magenta);
}

@media (max-width: 768px) {
  .sandstone-gallery-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .sandstone-gallery-grid { grid-template-columns: 1fr; }
}