/* ==========================================================================
   Design tokens (shared across the 3 Web_app_design apps)
   ========================================================================== */
:root {
  --ink: #18222c;
  --ink-muted: #5b6b7b;
  --ink-faint: #8595a5;
  --bg: #eef1f4;
  --panel: #ffffff;
  --panel-sub: #f7f9fa;
  --border: #d8dfe6;
  --border-strong: #b9c4cf;
  --accent: #0c7568;
  --accent-strong: #095c52;
  --accent-soft: #e2f2ef;
  --accent-ring: rgba(12, 117, 104, 0.22);
  --ok: #1b7a3d;
  --ok-soft: #e0f2e6;
  --warn: #8a6116;
  --warn-soft: #fdf3d8;
  --err: #b3261e;
  --err-soft: #fdebea;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 32, 0.05), 0 4px 16px rgba(16, 24, 32, 0.05);
  --sans: system-ui, -apple-system, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, monospace;

  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  line-height: 1.6;
  color-scheme: light;
}

body {
  margin: 0;
}

[hidden] {
  display: none !important;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

p,
dl,
fieldset {
  margin: 0;
}

/* Header */
.app-header {
  border-top: 3px solid var(--accent);
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.app-header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.app-header h1 {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.lang-switch {
  flex-shrink: 0;
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
  background: var(--panel-sub);
}

.lang-switch button {
  border: 0;
  border-radius: 999px;
  padding: 4px 14px;
  color: var(--ink-muted);
  background: transparent;
  font-size: 0.82rem;
  font-weight: 700;
}

.lang-switch button.is-active {
  color: #ffffff;
  background: var(--accent);
}

/* Layout & panels */
.app-shell {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.panel {
  margin-top: 20px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel:first-child {
  margin-top: 0;
}

/* Presets & tabs */
.preset-area {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-note {
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.tabs {
  display: inline-flex;
  gap: 0;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
  background: var(--panel-sub);
}

.tab {
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-muted);
  padding: 7px 18px;
  font-weight: 600;
}

.tab.is-active {
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
}

/* Form */
.field-grid {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 6px;
}

.field > span {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink);
}

.field input[type="number"] {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  background: var(--panel);
  font-variant-numeric: tabular-nums;
  transition: border-color 0.12s, box-shadow 0.12s;
}

.field input[type="number"]:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.field small {
  color: var(--ink-muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.field output {
  font-variant-numeric: tabular-nums;
  color: var(--accent-strong);
}

.radio-group {
  display: grid;
  gap: 8px;
  border: 0;
  padding: 0;
}

.radio-group legend {
  margin-bottom: 6px;
  padding: 0;
  font-size: 0.88rem;
  font-weight: 700;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
}

.radio-group input[type="radio"] {
  accent-color: var(--accent);
}

.inline-result {
  margin-top: 16px;
  padding: 10px 14px;
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  background: var(--accent-soft);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.result-box {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel-sub);
}

.result-box dl {
  display: grid;
  gap: 10px;
}

.result-box div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.result-box dt {
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.result-box dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* Buttons */
.primary-action {
  margin-top: 16px;
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #ffffff;
  padding: 10px 18px;
  font-weight: 700;
  transition: background 0.12s;
}

.primary-action:hover:not(:disabled) {
  background: var(--accent-strong);
}

.primary-action:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.secondary-action {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--ink);
  padding: 8px 13px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: border-color 0.12s, background 0.12s;
}

.secondary-action:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* Messages & warnings */
.message {
  margin-top: 14px;
  padding: 10px 13px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.message.is-error {
  border: 1px solid color-mix(in srgb, var(--err) 35%, transparent);
  background: var(--err-soft);
  color: var(--err);
}

.message.is-caution {
  border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent);
  background: var(--warn-soft);
  color: var(--warn);
}

.warnings {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.warning {
  border-radius: var(--radius-sm);
  padding: 10px 13px;
  font-size: 0.9rem;
}

.warning.is-error {
  border: 1px solid color-mix(in srgb, var(--err) 35%, transparent);
  background: var(--err-soft);
  color: var(--err);
}

.warning.is-caution {
  border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent);
  background: var(--warn-soft);
  color: var(--warn);
}

/* Result cards */
.cards {
  display: grid;
  gap: 12px;
}

.summary-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  background: var(--panel-sub);
}

.summary-card h3 {
  margin: 0 0 8px;
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.metric {
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.detail {
  margin-top: 8px;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.zone-label {
  display: inline-block;
  margin-top: 10px;
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 0.85rem;
  font-weight: 700;
}

.is-ideal {
  background: var(--ok-soft);
  color: var(--ok);
}

.is-acceptable {
  background: var(--warn-soft);
  color: var(--warn);
}

.is-bad {
  background: var(--err-soft);
  color: var(--err);
}

/* Chart & table */
.chart-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.chart-frame {
  height: 360px;
  margin-top: 14px;
}

.chart-frame canvas {
  width: 100%;
  height: 100%;
}

.table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

thead th {
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 9px 10px;
  text-align: right;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

th:first-child,
td:first-child {
  text-align: left;
}

tbody th {
  font-weight: 600;
}

/* Notes */
.notes {
  margin-top: 24px;
  color: var(--ink-muted);
  font-size: 0.88rem;
}

.notes ul {
  margin: 0;
  padding-left: 1.2em;
}

.notes li + li {
  margin-top: 6px;
}

/* Responsive */
@media (min-width: 680px) {
  .field-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .app-header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}