/* --- 样式重置与核心变量 --- */
:root {
  --bg-color: #07080c;
  --surface-card: rgba(25, 28, 38, 0.65);
  --surface-card-hover: rgba(35, 40, 55, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --text-main: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* AQI 分级颜色 (国标/美标兼容配色) */
  --aqi-good: #10b981;        /* 0-50 优 */
  --aqi-moderate: #eab308;    /* 51-100 良 */
  --aqi-sensitive: #f97316;   /* 101-150 轻度污染 */
  --aqi-unhealthy: #ef4444;   /* 151-200 中度污染 */
  --aqi-very-unhealthy: #a855f7; /* 201-300 重度污染 */
  --aqi-hazardous: #e11d48;   /* 300+ 严重污染 */

  --current-aqi-color: var(--aqi-good);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  overflow-x: hidden;
  background-image: radial-gradient(circle at 50% 10%, rgba(20, 30, 45, 0.4) 0%, transparent 80%);
}

/* 防烧屏微移容器 */
.display-container {
  width: 100%;
  max-width: 540px;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: calc(12px + env(safe-area-inset-top, 0px)) 16px calc(12px + env(safe-area-inset-bottom, 0px)) 16px;
  margin: 0 auto;
  transition: transform 0.8s ease;
}

/* 顶部状态栏 */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.location-box {
  display: flex;
  align-items: center;
  gap: 6px;
}

.location-icon {
  font-size: 1.1rem;
}

.city-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #fff;
}

.station-badge {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 7px;
  border-radius: 12px;
  color: var(--text-secondary);
}

.action-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 16px;
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.icon-btn:active {
  transform: scale(0.95);
  background: rgba(255, 255, 255, 0.2);
}

.icon-btn.active {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

/* 桌面数字时钟区 */
.clock-section {
  text-align: center;
  padding: 8px 0 14px 0;
}

.digital-time {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Roboto Mono", monospace;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -1.5px;
  display: flex;
  justify-content: center;
  align-items: baseline;
}

.clock-hm {
  font-size: clamp(3.2rem, 15vw, 4.8rem);
  color: #ffffff;
}

.clock-sec {
  font-size: clamp(1.4rem, 6vw, 2.0rem);
  color: var(--text-muted);
  margin-left: 2px;
  font-variant-numeric: tabular-nums;
}

.date-display {
  margin-top: 6px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

/* 核心 AQI 卡片 */
.aqi-hero-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 20px 22px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.aqi-hero-card::before {
  content: "";
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  height: 100%;
  background: radial-gradient(ellipse at center, var(--current-aqi-color) 0%, transparent 65%);
  opacity: 0.22;
  pointer-events: none;
  filter: blur(28px);
  transition: background 0.6s ease;
}

.aqi-main-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.aqi-val-wrapper {
  display: flex;
  flex-direction: column;
}

.aqi-title-tag {
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.aqi-number {
  font-size: clamp(3.8rem, 16vw, 5.2rem);
  font-weight: 800;
  line-height: 1.05;
  color: var(--current-aqi-color);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Rounded", "Roboto", sans-serif;
  transition: color 0.4s ease;
}

.aqi-badge-wrapper {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.aqi-level-badge {
  font-size: 1.25rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 30px;
  background-color: var(--current-aqi-color);
  color: #000;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
  letter-spacing: 0.5px;
  transition: background-color 0.4s ease;
}

.pollutant-pill {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.08);
  padding: 3px 10px;
  border-radius: 12px;
}

.health-advice {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.45;
  color: #e5e7eb;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

/* 关键指标 6 格网格 */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 14px 0;
}

.metric-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 12px 10px;
  text-align: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  white-space: nowrap;
}

.metric-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Roboto Mono", monospace;
  font-variant-numeric: tabular-nums;
}

.metric-unit {
  font-size: 0.65rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* 未来趋势预报卡片 */
.forecast-section {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 12px 16px;
  margin-bottom: 12px;
}

.forecast-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.forecast-list {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.forecast-item {
  flex: 1;
  text-align: center;
  padding: 6px 4px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 12px;
}

.forecast-item.empty {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 10px 0;
}

.forecast-date {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.forecast-badge {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  margin: 4px 0 2px 0;
}

.forecast-range {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* 底部状态条 */
.footer-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  padding-top: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #10b981;
  display: inline-block;
  box-shadow: 0 0 8px #10b981;
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.15); }
}

.loading-spin .btn-icon {
  display: inline-block;
  animation: spin 1s infinite linear;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}


/* 横屏支持 (Landscape Mode for Desk Stand) */
@media (orientation: landscape) and (max-height: 520px) {
  .display-container {
    max-width: 900px;
    padding: 8px 16px;
  }
  .clock-section {
    padding: 2px 0 6px 0;
  }
  .clock-hm {
    font-size: 2.8rem;
  }
  .aqi-number {
    font-size: 3.2rem;
  }
  .metrics-grid {
    grid-template-columns: repeat(6, 1fr);
    margin: 8px 0;
  }
}