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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --code-bg: #f8fafc;
  --success: #16a34a;
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 55%, #3b82f6 100%);
  color: #fff;
  padding: 48px 20px 72px;
  text-align: center;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.hero .subtitle {
  margin-top: 10px;
  font-size: 1rem;
  opacity: 0.92;
}

.container {
  flex: 1;
  width: 100%;
  max-width: 860px;
  margin: -38px auto 40px;
  padding: 0 16px;
}

.search-panel {
  background: var(--card);
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.1);
  padding: 20px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 4px 14px;
  transition: border-color 0.2s ease;
  background: #fff;
}

.search-box:focus-within {
  border-color: var(--primary);
}

.search-icon {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

#searchInput {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.05rem;
  padding: 12px 0;
  background: transparent;
  color: var(--text);
}

#searchInput::placeholder {
  color: #94a3b8;
}

.clear-btn {
  border: none;
  background: #e2e8f0;
  color: var(--text-secondary);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 1.05rem;
  line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s;
}

.clear-btn:hover {
  background: #cbd5e1;
  color: var(--text);
}

.search-hint {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.province-panel {
  margin-top: 18px;
  background: var(--card);
  border-radius: 12px;
  padding: 16px 20px;
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.05);
}

.panel-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.province-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.province-btn {
  border: 1px solid var(--border);
  background: var(--code-bg);
  color: var(--text);
  font-size: 0.85rem;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.province-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.province-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.result-panel {
  margin-top: 18px;
}

.result-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  padding: 0 4px;
}

.result-summary b {
  color: var(--primary);
}

.result-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.result-item {
  background: var(--card);
  border-radius: 10px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.05);
  transition: box-shadow 0.15s ease;
}

.result-item:hover {
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.1);
}

.result-addr {
  font-size: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.addr-sep {
  color: #cbd5e1;
}

.addr-province {
  font-weight: 600;
}

.addr-city,
.addr-district {
  color: var(--text);
}

.addr-district {
  color: var(--primary-dark);
  font-weight: 500;
}

.result-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.postcode {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
  background: var(--primary-light);
  padding: 3px 10px;
  border-radius: 6px;
}

.copy-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-secondary);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.copy-btn.copied {
  border-color: var(--success);
  color: var(--success);
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  background: var(--card);
  border-radius: 12px;
}

.footer {
  text-align: center;
  padding: 20px 16px 32px;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

@media (min-width: 640px) {
  .result-list {
    grid-template-columns: 1fr 1fr;
  }
}