/* Nightline theme (A+1): deep dark with mint accent */
:root{
  --bg:#0F1418;
  --surface:#11171C;
  --text:#E6EDF3;
  --text-dim:#A7B4BE;
  --accent:#00D0A8;
  --divider:#1B232A;
}

/* Warm Sunset theme: warm orange-red tones */
:root[data-theme="sunset"] {
  --bg: #1A0F0A;        /* 深暖棕 */
  --surface: #2D1B0F;   /* 暖棕灰 */
  --text: #F5E6D3;      /* 暖米白 */
  --text-dim: #D4B896;  /* 暖米黄 */
  --accent: #FF6B35;    /* 活力橙 */
  --divider: #3D2A1A;   /* 深暖棕 */
}

/* Classic Light theme: bright and clean */
:root[data-theme="light"] {
  --bg: #F8F9FA;        /* 浅灰白 */
  --surface: #FFFFFF;   /* 纯白 */
  --text: #212529;      /* 深灰黑 */
  --text-dim: #6C757D;  /* 中灰 */
  --accent: #007BFF;    /* 经典蓝 */
  --divider: #E9ECEF;   /* 浅灰 */
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color:var(--text);
  background:var(--bg);
}
.site-header{position:sticky;top:0;z-index:20;background:rgba(15,20,24,.8);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--divider)}
.nav{max-width:1280px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 16px}
.brand{color:var(--text);text-decoration:none;font-weight:700;letter-spacing:.4px}
.nav-link{color:var(--text-dim);text-decoration:none;margin-left:16px}
.nav-link:hover{color:var(--text)}
.nav-link.active{color:var(--accent)}

main{max-width:1280px;margin:0 auto;padding:24px 16px}

.hero{display:grid;grid-template-columns:1fr;gap:24px;align-items:center;padding:36px 0}
.hero-title{font-size:44px;line-height:1.1;margin:0 0 8px}
.hero-sub{color:var(--text-dim);margin:0 0 16px}
.hero-ctas{display:flex;gap:12px;margin-bottom:8px}

.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:8px;text-decoration:none;border:1px solid transparent;cursor:pointer;font-weight:600}
.btn-primary{background:var(--accent);color:var(--bg)}
.btn-primary:hover{filter:brightness(1.1)}
.btn-ghost{background:transparent;border-color:var(--divider);color:var(--text)}
.btn-ghost:hover{border-color:var(--text)}
.helper{color:var(--text-dim);font-size:14px}

.game-frame{position:relative;background:var(--bg) url('./icon1.png') center/cover no-repeat;border:1px solid var(--divider);border-radius:12px;aspect-ratio:16/9;overflow:hidden;width:100%;max-width:1120px;margin-left:auto;margin-right:auto}
.frame-preview{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.3;filter:saturate(90%) brightness(.9);z-index:1}
.frame-start{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;z-index:3}
 .frame-start .start-card{background:rgba(0,0,0,.45);backdrop-filter:blur(6px);border:1px solid var(--divider);border-radius:12px;padding:16px 20px;text-align:center}
 .frame-start .start-card h3{margin:0 0 8px}
 .frame-start .start-card p{margin:0 0 12px;color:var(--text-dim)}
 .frame-start .start-actions{display:flex;gap:12px;justify-content:center;flex-direction:column}
.frame-overlay{position:absolute;inset:0;background:rgba(0,0,0,.6);display:none;align-items:center;justify-content:center;padding:16px;text-align:center;z-index:4}
.frame-overlay .overlay-card{background:var(--surface);border:1px solid var(--divider);border-radius:12px;padding:16px;max-width:520px}
.frame-overlay .overlay-card p{margin:0 0 12px;color:var(--text-dim)}
.frame-overlay .overlay-actions{display:flex;gap:12px;justify-content:center}
.frame-action{position:absolute;top:10px;right:10px;background:rgba(0,0,0,0.6);color:var(--text);border:1px solid var(--divider);border-radius:8px;padding:6px 8px;cursor:pointer;z-index:5}
.frame-action:disabled{cursor:not-allowed;opacity:.75}
.frame-action:not(:disabled):hover{background:rgba(0,0,0,0.8);border-color:var(--accent)}

.skeleton{position:absolute;inset:0;height:100%;padding:20px;display:flex;flex-direction:column;justify-content:flex-end;gap:8px;background-image:radial-gradient(ellipse at 25% 10%,rgba(255,255,255,.05),transparent 60%),radial-gradient(ellipse at 80% 20%,rgba(255,255,255,.04),transparent 60%);z-index:2}
.skeleton-bar{height:8px;background:var(--divider);border-radius:4px}

.highlights{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:32px 0}
.card{background:var(--surface);border:1px solid var(--divider);border-radius:12px;padding:16px}
.card h3{margin:0 0 8px}
.card p{margin:0;color:var(--text-dim)}

.guide,.faq,.similar{margin:40px 0}
.intro{margin:32px 0}
.intro-card{background:var(--surface);border:1px solid var(--divider);border-radius:12px;padding:20px;text-align:center}
.intro-card p{margin:0 0 10px;color:var(--text-dim)}
.intro-card strong{color:var(--text)}
.grid.two{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.grid.three{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.link-card{color:var(--text);text-decoration:none}
.link-card:hover{border-color:var(--text)}

 .site-footer{border-top:1px solid var(--divider);padding:24px 16px;color:var(--text-dim);text-align:center}
 .site-footer a{color:var(--text-dim)}
 
 .install-prompt{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.8);display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px}
 .install-card{background:var(--surface);border:1px solid var(--divider);border-radius:12px;padding:20px;text-align:center;max-width:400px}
 .install-card h4{margin:0 0 8px}
 .install-card p{margin:0 0 16px;color:var(--text-dim)}
 .install-actions{display:flex;gap:12px;justify-content:center}

@media (max-width: 960px){
  .hero{grid-template-columns:1fr;}
  .grid.two{grid-template-columns:1fr}
  .grid.three{grid-template-columns:1fr 1fr}
}

@media (max-width: 520px){
  .grid.three{grid-template-columns:1fr}
}

/* Additional styles for new pages */
.content {
  padding: 24px 0;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px;
}

.content h2 {
  color: var(--accent);
  margin: 32px 0 16px;
  font-size: 28px;
}

.content h3 {
  color: var(--text);
  margin: 24px 0 12px;
  font-size: 20px;
}

.content p {
  line-height: 1.6;
  margin: 0 0 16px;
  color: var(--text-dim);
}

.content ul {
  margin: 0 0 16px;
  padding-left: 20px;
}

.content li {
  margin: 8px 0;
  color: var(--text-dim);
  line-height: 1.5;
}

.content strong {
  color: var(--text);
  font-weight: 600;
}

.content a {
  color: var(--accent);
  text-decoration: none;
}

.content a:hover {
  text-decoration: underline;
}

.faq-section {
  margin: 32px 0;
}

.faq-item {
  margin: 24px 0;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: 8px;
}

.faq-item h3 {
  margin: 0 0 12px;
  color: var(--accent);
}

.faq-item p {
  margin: 0 0 12px;
}

.faq-item ul {
  margin: 12px 0;
}

.install-prompt {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.install-card {
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: 12px;
  padding: 24px;
  max-width: 400px;
  text-align: center;
}

.install-card h4 {
  margin: 0 0 12px;
  color: var(--accent);
}

.install-card p {
  margin: 0 0 20px;
  color: var(--text-dim);
}

.install-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* Theme switcher styles */
.theme-switcher {
  position: relative;
  display: inline-block;
}

.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* Smooth transitions for theme changes */
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Override transitions for specific elements that shouldn't animate */
.game-frame iframe,
.frame-preview,
.skeleton {
  transition: none;
}