/* Simple But Great — Apple-inspired UI
   Spacing rhythm: 8px base */

:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --accent: #0071e3;
  --accent-pressed: #0077ed;
  --border: rgba(0, 0, 0, 0.14);
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.08), 0 12px 32px rgba(0, 0, 0, 0.10);
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --radius-sm: 12px;
  --radius-pill: 980px;
  --space: 8px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max: 720px;
  --wide: 960px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.47;
  font-size: 17px;
  min-height: 100dvh;
  -webkit-font-smoothing: auto;
  -moz-osx-font-smoothing: auto;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

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

.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* —— Top bar —— */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(var(--space) * 2) calc(var(--space) * 3);
  max-width: var(--wide);
  width: 100%;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space) * 1.5);
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(145deg, #007AFF 0%, #5ac8fa 100%);
  box-shadow: var(--shadow-sm);
}

.brand-text {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.nav {
  display: flex;
  gap: var(--space);
}

.nav-link {
  padding: calc(var(--space) * 1) calc(var(--space) * 1.75);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--secondary);
  transition: color 0.15s ease, background 0.15s ease;
}

.nav-link:hover {
  color: var(--text);
}

.nav-link.is-active {
  color: var(--text);
  background: rgba(0, 0, 0, 0.05);
}

/* —— Main —— */
.main {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: calc(var(--space) * 4) calc(var(--space) * 3) calc(var(--space) * 8);
}

.view[hidden],
.view:not(.is-visible) {
  display: none;
}

.view.is-visible {
  display: block;
  animation: fadeIn 0.28s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: calc(var(--space) * 1.5);
}

.hero h1,
.about-panel h1 {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: calc(var(--space) * 2);
}

.lede {
  font-size: 19px;
  color: var(--secondary);
  max-width: 36em;
  margin-bottom: calc(var(--space) * 5);
  letter-spacing: -0.01em;
}

/* —— Query card —— */
.query-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: calc(var(--space) * 3);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: calc(var(--space) * 1.5);
}

.field-row {
  display: flex;
  gap: calc(var(--space) * 1.5);
  flex-wrap: wrap;
}

.field-input {
  flex: 1 1 200px;
  min-height: 48px;
  padding: 0 calc(var(--space) * 2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field-input::placeholder {
  color: #a1a1a6;
}

.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.2);
  background: var(--surface);
}

.field-hint {
  margin-top: calc(var(--space) * 2);
  font-size: 13px;
  color: var(--secondary);
}

.form-error {
  margin-top: calc(var(--space) * 1.5);
  font-size: 13px;
  color: #ff3b30;
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 calc(var(--space) * 3);
  border-radius: var(--radius-sm);
  font-size: 17px;
  font-weight: 510;
  letter-spacing: -0.01em;
  transition: background 0.15s ease, transform 0.1s ease, opacity 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-pressed);
}

.btn-ghost {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text);
  min-height: 36px;
  font-size: 14px;
  padding: 0 calc(var(--space) * 2);
}

.btn-ghost:hover {
  background: rgba(0, 0, 0, 0.08);
}

.text-btn,
.text-link {
  color: var(--accent);
  font-weight: 500;
  font-size: inherit;
}

.text-btn:hover,
.text-link:hover {
  text-decoration: underline;
}

.secondary-link-wrap {
  text-align: center;
  margin-top: calc(var(--space) * 3);
  font-size: 15px;
}

/* —— Results —— */
.results {
  margin-top: calc(var(--space) * 5);
  animation: fadeIn 0.3s ease;
}

.results[hidden] {
  display: none;
}

.results-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: calc(var(--space) * 2);
  margin-bottom: calc(var(--space) * 3);
}

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #b45309;
  background: #fef3c7;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: calc(var(--space) * 1.5);
}

.results-head h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.results-meta {
  margin-top: 4px;
  font-size: 14px;
  color: var(--secondary);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--space) * 2);
  margin-bottom: calc(var(--space) * 2);
}

.metric-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: calc(var(--space) * 2.5);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.metric-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--secondary);
  margin-bottom: calc(var(--space) * 1);
}

.metric-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.metric-value-sm {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.metric-sub {
  margin-top: calc(var(--space) * 1);
  font-size: 13px;
  color: var(--secondary);
  font-variant-numeric: tabular-nums;
}

.metric-sub.is-up {
  color: #34c759;
}

.metric-sub.is-down {
  color: #ff3b30;
}

.table-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: calc(var(--space) * 2.5);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.table-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: calc(var(--space) * 2);
}

.table-card-head h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.pill {
  font-size: 12px;
  font-weight: 500;
  color: var(--secondary);
  background: var(--bg);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.data-table th {
  text-align: left;
  font-weight: 500;
  font-size: 12px;
  color: var(--secondary);
  padding: calc(var(--space) * 1) 0;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: calc(var(--space) * 1.75) 0;
  border-bottom: 1px solid var(--border);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table th:last-child,
.data-table td:last-child {
  text-align: right;
}

.disclaimer {
  margin-top: calc(var(--space) * 3);
  font-size: 12px;
  color: var(--secondary);
  text-align: center;
}

/* —— About —— */
.about-panel {
  padding-top: calc(var(--space) * 2);
}

.about-body {
  font-size: 19px;
  color: var(--secondary);
  line-height: 1.55;
  letter-spacing: -0.01em;
  margin-bottom: calc(var(--space) * 4);
  max-width: 34em;
}

/* —— Footer —— */
.footer {
  text-align: center;
  padding: calc(var(--space) * 3);
  font-size: 12px;
  color: var(--secondary);
}

/* —— Responsive —— */
@media (max-width: 640px) {
  .topbar {
    padding: calc(var(--space) * 2);
  }

  .brand-text {
    font-size: 14px;
  }

  .main {
    padding: calc(var(--space) * 3) calc(var(--space) * 2) calc(var(--space) * 6);
  }

  .lede {
    font-size: 17px;
  }

  .field-row {
    flex-direction: column;
  }

  .btn-primary {
    width: 100%;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .metric-value {
    font-size: 32px;
  }

  .results-head {
    flex-direction: column;
  }
}

@media (min-width: 1280px) {
  .main {
    padding-top: calc(var(--space) * 6);
  }
}