/* 全局样式 - 移动端优先 */
:root {
  --bg: #0a0e27;
  --card: #131842;
  --accent: #ff6b35;
  --gold: #ffd700;
  --text: #e8e8f0;
  --text-muted: #8890b5;
  --border: #252d5a;
  --green: #00c853;
  --red: #ff1744;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
  min-height: 100vh;
}

/* Header */
.header {
  text-align: center;
  padding: 20px 0;
  position: relative;
  z-index: 1;
}
.header .logo-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 4px;
}
.header .trophy {
  font-size: 36px;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.header h1 {
  font-size: 22px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gold), #ffaa00, var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header .subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

/* Screen management */
.screen { display: none; }
.screen.active { display: block; }

/* === 啊哈时刻 === */
.aha-screen { text-align: center; padding-top: 20px; }
.aha-champion {
  animation: fadeInUp 0.6s ease-out;
  margin-bottom: 16px;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.aha-champion .champion-crown { font-size: 48px; display: block; }
.aha-champion .champion-flag { font-size: 72px; display: block; margin: 8px 0; }
.aha-champion .champion-name {
  font-size: 32px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--gold), #ff8c00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.aha-champion .champion-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}
.aha-quick-preview {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin: 16px 0;
  border: 1px solid var(--border);
}
.aha-quick-preview .preview-row {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 6px 0;
  font-size: 13px;
}
.aha-quick-preview .preview-row .medal { font-size: 18px; }
.aha-quick-preview .divider {
  border-top: 1px dashed var(--border);
  margin: 8px 0;
}
.aha-quick-preview .preview-label {
  color: var(--text-muted);
  font-size: 11px;
}

/* Buttons */
.btn {
  display: block;
  width: 100%;
  padding: 14px;
  border-radius: var(--radius);
  border: none;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  margin-bottom: 10px;
  -webkit-appearance: none;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #ff5722);
  color: white;
  box-shadow: 0 4px 20px rgba(255,107,53,0.3);
}
.btn-outline {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text);
}
.btn-gold {
  background: linear-gradient(135deg, var(--gold), #ffaa00);
  color: #1a1a2e;
  font-weight: 800;
}
.btn-refresh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  margin-top: 8px;
  -webkit-appearance: none;
}

/* === 小组排名 === */
.groups-header {
  text-align: center;
  padding: 12px 0;
}
.groups-header h2 { font-size: 18px; margin-bottom: 4px; }
.groups-header .step-indicator { font-size: 12px; color: var(--text-muted); }
.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 8px 0 16px;
  overflow: hidden;
}
.progress-bar .fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s;
}
.group-tabs {
  display: flex;
  overflow-x: auto;
  gap: 8px;
  padding-bottom: 12px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.group-tabs::-webkit-scrollbar { display: none; }
.group-tab {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-appearance: none;
  font-family: inherit;
}
.group-tab.active, .group-tab.done {
  border-color: var(--accent);
  background: rgba(255,107,53,0.15);
  color: var(--accent);
}
.team-row {
  display: flex;
  align-items: center;
  padding: 12px;
  margin: 6px 0;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  -webkit-touch-callout: none;
  user-select: none;
}
.team-row:active { background: rgba(255,107,53,0.1); }
.team-row.selected {
  border-color: var(--accent);
  background: rgba(255,107,53,0.08);
}
.team-row .rank-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  margin-right: 10px;
  flex-shrink: 0;
}
.team-row .rank-num.pos-1 { background: #ffd700; color: #1a1a2e; }
.team-row .rank-num.pos-2 { background: #c0c0c0; color: #1a1a2e; }
.team-row .rank-num.pos-3 { background: #cd7f32; color: white; }
.team-row .team-flag { font-size: 24px; margin-right: 10px; }
.team-row .team-info { flex: 1; min-width: 0; }
.team-row .team-name { font-size: 15px; font-weight: 600; }
.team-row .team-rank { font-size: 11px; color: var(--text-muted); }
.team-row .swap-hint {
  font-size: 11px;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
  white-space: nowrap;
}
.team-row.selected .swap-hint { opacity: 1; }
.team-row .advance-badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(0,200,83,0.15);
  color: var(--green);
  white-space: nowrap;
  margin-left: 6px;
}
.team-row .third-badge {
  background: rgba(255,171,0,0.15);
  color: #ffab00;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
  margin-left: 6px;
}

/* === 淘汰赛对阵 === */
.bracket-header { text-align: center; padding: 12px 0; }
.bracket-header h2 { font-size: 18px; }
.round-label {
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  margin: 20px 0 12px;
  padding: 8px;
  background: rgba(255,107,53,0.1);
  border-radius: var(--radius);
}
.bracket-match {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px;
  margin: 6px 0;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
  -webkit-touch-callout: none;
  user-select: none;
}
.bracket-match:active { border-color: var(--accent); }
.bracket-match.picked { border-color: var(--accent); background: rgba(255,107,53,0.05); }
.bracket-match .match-team {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  cursor: pointer;
}
.bracket-match .match-team.right { justify-content: flex-end; text-align: right; }
.bracket-match .match-flag { font-size: 20px; }
.bracket-match .match-name { font-size: 13px; font-weight: 600; }
.bracket-match .match-vs {
  margin: 0 12px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 700;
}
.bracket-match .winner-mark {
  font-size: 20px;
  margin-left: 8px;
  opacity: 0;
}
.bracket-match.picked .winner-mark { opacity: 1; }

/* === 结果页 === */
.result-screen { text-align: center; }
.result-hero {
  padding: 24px 0;
  animation: fadeInUp 0.5s ease-out;
}
.result-hero .result-flag { font-size: 80px; display: block; }
.result-hero .result-name {
  font-size: 36px;
  font-weight: 900;
  margin: 12px 0;
  background: linear-gradient(135deg, var(--gold), #ff8c00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.result-hero .result-crown { font-size: 40px; }
.result-bracket-preview {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin: 16px 0;
  border: 1px solid var(--border);
  text-align: left;
}
.result-row {
  display: flex;
  align-items: center;
  padding: 8px 0;
  font-size: 13px;
}
.result-row .r-label {
  width: 50px;
  color: var(--text-muted);
  font-size: 11px;
  flex-shrink: 0;
}
.result-row .r-flag { font-size: 18px; margin: 0 6px; }
.result-row .r-name { flex: 1; }
.social-proof {
  font-size: 13px;
  color: var(--text-muted);
  margin: 16px 0;
}

/* === 分享海报 === */
.poster-preview {
  background: linear-gradient(180deg, #1a1040 0%, #0d1638 100%);
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin: 16px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.poster-preview::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(255,215,0,0.06), transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(255,107,53,0.04), transparent 50%);
  pointer-events: none;
}
.poster-preview .poster-title {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.poster-preview .poster-champion {
  font-size: 60px;
  margin: 12px 0;
}
.poster-preview .poster-name {
  font-size: 28px;
  font-weight: 900;
  color: var(--gold);
  margin-bottom: 16px;
}
.poster-preview .poster-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.poster-preview .poster-cta {
  display: inline-block;
  padding: 10px 24px;
  background: var(--accent);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
}
.poster-preview .poster-watermark {
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  margin-top: 12px;
}
.share-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.share-btn {
  flex: 1;
  min-width: 80px;
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  text-align: center;
  font-family: inherit;
  transition: all 0.2s;
  -webkit-appearance: none;
}
.share-btn:active { background: rgba(255,107,53,0.1); border-color: var(--accent); }
.share-btn .share-icon { font-size: 20px; display: block; margin-bottom: 4px; }

/* Toast */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--accent);
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 14px;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show { opacity: 1; }

/* 响应式 */
@media (min-width: 768px) {
  .container { max-width: 600px; }
  .group-tabs { justify-content: center; }
}

/* === FAQ Section (工具站2.0 Layer 6) === */
.faq-section {
  background: linear-gradient(180deg, var(--bg) 0%, #0d1230 100%);
  padding: 40px 0 60px;
  border-top: 1px solid var(--border);
}
.faq-title {
  text-align: center;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 24px;
  color: var(--gold);
}
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.faq-item {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.2s;
}
.faq-item[open] {
  border-color: var(--accent);
}
.faq-question {
  padding: 16px 40px 16px 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  color: var(--text);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after {
  content: '+';
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--text-muted);
  transition: transform 0.3s;
  font-weight: 300;
}
.faq-item[open] .faq-question::after {
  content: '−';
  color: var(--accent);
}
.faq-answer {
  padding: 0 16px 16px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.faq-answer p { margin: 0; }
.faq-answer strong { color: var(--text); }

/* === Footer === */
.site-footer {
  text-align: center;
  padding: 24px 16px 32px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}
.site-footer a {
  color: var(--accent);
  text-decoration: none;
}
.site-footer .footer-divider {
  margin: 0 8px;
  opacity: 0.4;
}