/* 全球时间 Web 版 — 深色专业风 + 响应式 */
:root {
  --bg: #0f1020;
  --bg-card: #1a1a2e;
  --bg-elev: #22223b;
  --border: #2d2d46;
  --text: #e8e8f0;
  --text-dim: #8e8ea0;
  --accent: #4fc3f7;
  --accent-soft: rgba(79, 195, 247, 0.14);
  --danger: #ff6b6b;
  --radius: 14px;
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
}

.app { max-width: 760px; margin: 0 auto; min-height: 100vh; display: flex; flex-direction: column; }

/* ===== 顶部导航 ===== */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 16, 32, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner { max-width: 760px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; }
.logo-icon { font-size: 22px; }
.nav { display: flex; gap: 6px; }
.nav-btn {
  background: transparent; border: 1px solid var(--border); color: var(--text-dim);
  padding: 7px 16px; border-radius: 20px; cursor: pointer; font-size: 14px;
  transition: all 0.2s;
}
.nav-btn:hover { color: var(--text); border-color: var(--accent); }
.nav-btn.active { background: var(--accent); border-color: var(--accent); color: #0f1020; font-weight: 600; }

/* ===== 内容区 ===== */
.content { flex: 1; padding: 20px 20px 40px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ===== 时钟页 Hero ===== */
.hero {
  background: linear-gradient(145deg, #1a1a3e 0%, #22223b 100%);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.hero-city { font-size: 20px; color: var(--text-dim); font-weight: 600; margin-bottom: 10px; }
.hero-time {
  font-size: 72px; font-weight: 700; letter-spacing: 2px;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  text-shadow: 0 0 30px rgba(79, 195, 247, 0.35);
  margin-bottom: 8px;
}
.hero-date { font-size: 15px; color: var(--text-dim); margin-bottom: 6px; }
.hero-offset { font-size: 13px; color: var(--accent); }

/* 城市横滑条 */
.city-strip {
  display: flex; gap: 8px; overflow-x: auto;
  padding: 6px 2px 14px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.city-strip::-webkit-scrollbar { display: none; }
.city-chip {
  flex-shrink: 0; padding: 8px 16px; border-radius: 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-dim); cursor: pointer; font-size: 14px;
  transition: all 0.2s;
}
.city-chip.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); font-weight: 600; }

.section-title { font-size: 15px; color: var(--text-dim); font-weight: 600; margin: 18px 0 12px; letter-spacing: 0.5px; }

/* 快捷城市网格 */
.quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.quick-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 10px; text-align: center;
  cursor: pointer; transition: all 0.2s;
}
.quick-item:hover { border-color: var(--accent); transform: translateY(-2px); }
.quick-name { font-size: 13px; color: var(--text-dim); margin-bottom: 8px; }
.quick-time { font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums; margin-bottom: 4px; }
.quick-offset { font-size: 11px; color: var(--accent); }

/* ===== 通用卡片 ===== */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}

/* ===== 换算页 ===== */
.convert-card .row { display: flex; align-items: flex-end; gap: 12px; margin-bottom: 20px; }
.picker-wrap { flex: 1; }
.picker-label { font-size: 12px; color: var(--text-dim); display: block; margin-bottom: 6px; }
.picker {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  font-size: 16px; appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238e8ea0' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center;
}
.swap-btn {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 12px;
  background: var(--accent-soft); border: 1px solid var(--accent); color: var(--accent);
  font-size: 22px; cursor: pointer; transition: all 0.2s;
}
.swap-btn:hover { background: var(--accent); color: #0f1020; }

.time-input-row { display: flex; align-items: center; gap: 6px; margin-bottom: 20px; }
.time-input {
  width: 70px; padding: 12px 8px; text-align: center; border-radius: 10px;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums;
}
.colon { font-size: 24px; color: var(--text-dim); }
.select-text { font-size: 13px; color: var(--text-dim); margin-left: 6px; }

.result-box {
  background: var(--bg-elev); border: 1px solid var(--accent);
  border-radius: var(--radius); padding: 18px; margin-bottom: 20px; text-align: center;
}
.result-label { font-size: 12px; color: var(--text-dim); margin-bottom: 8px; }
.result-value { display: flex; align-items: baseline; justify-content: center; gap: 10px; }
.res-time { font-size: 48px; font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }
.res-city { font-size: 15px; color: var(--text-dim); }
.result-offset { margin-top: 8px; font-size: 13px; color: var(--text); }
.result-note { margin-top: 4px; font-size: 12px; color: var(--danger); }

.btn-primary {
  width: 100%; padding: 14px; border: none; border-radius: 12px;
  background: var(--accent); color: #0f1020; font-size: 16px; font-weight: 700;
  cursor: pointer; transition: all 0.2s;
}
.btn-primary:hover { background: #6fd0fa; }

/* 场景卡片 */
.scene-card { padding: 8px 4px; }
.scene-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; border-radius: 10px; cursor: pointer; transition: background 0.2s;
}
.scene-item:hover { background: var(--bg-elev); }
.scene-title { font-size: 14px; }
.scene-time { font-size: 14px; color: var(--accent); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ===== 城市页 ===== */
.search-bar { margin-bottom: 16px; }
.search-input {
  width: 100%; padding: 13px 16px; border-radius: 12px;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  font-size: 15px; outline: none; transition: border 0.2s;
}
.search-input:focus { border-color: var(--accent); }
.city-list { display: flex; flex-direction: column; gap: 8px; }
.city-row {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
}
.city-left { display: flex; align-items: center; gap: 12px; }
.city-flag { font-size: 26px; }
.city-name { font-size: 16px; font-weight: 600; }
.city-sub { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.city-right { text-align: right; }
.city-time { font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums; }
.city-offset { font-size: 11px; color: var(--accent); margin-top: 2px; }

/* ===== 广告位 ===== */
.ad-slot { margin-top: 24px; min-height: 40px; text-align: center; color: var(--text-dim); font-size: 12px; }
.hidden { display: none !important; }

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border); padding: 16px 20px 24px;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--text-dim); font-size: 12px;
}

/* ===== 响应式：移动端(<768) ===== */
@media (max-width: 767px) {
  .content { padding: 16px 14px 36px; }
  .hero { padding: 28px 18px; }
  .hero-time { font-size: 54px; }
  .quick-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .topbar-inner { padding: 12px 14px; }
}

/* ===== 响应式：小屏(<480) ===== */
@media (max-width: 479px) {
  .logo-text { font-size: 18px; }
  .nav-btn { padding: 6px 12px; font-size: 13px; }
  .hero-time { font-size: 46px; }
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
  .convert-card .row { flex-direction: column; align-items: stretch; }
  .swap-btn { align-self: center; width: 40px; height: 40px; }
  .time-input { width: 60px; }
  .res-time { font-size: 40px; }
}