/* ── Reset & Base ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0f1117;
  --surface:    #1a1d27;
  --border:     #2a2d3e;
  --accent:     #6c8ebf;
  --accent2:    #8ab4f8;
  --text:       #e2e8f0;
  --muted:      #6b7280;
  --solar:      #fbbf24;
  --green:      #34d399;
  --red:        #f87171;
  --radius:     12px;
  --font:       "Inter", "Segoe UI", system-ui, sans-serif;
  --mono:       "JetBrains Mono", "Fira Code", "Courier New", monospace;
  --card-pad:   2rem;
  --gap:        1.5rem;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Layout ─────────────────────────────────────────────── */
.page {
  max-width: 700px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 6rem;
}

/* ── Header ─────────────────────────────────────────────── */
header {
  margin-bottom: 3rem;
  text-align: center;
}

.header-icon {
  font-size: 2.25rem;
  color: var(--solar);
  line-height: 1;
  margin-bottom: 0.65rem;
  user-select: none;
}

header h1 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

header .subtitle {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

/* ── Card ────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--card-pad);
  margin-bottom: var(--gap);
}

/* Full-bleed divider within a card */
.card hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.75rem calc(-1 * var(--card-pad));
}

/* Accent top border on the result card */
.result-card {
  border-top-color: rgba(251, 191, 36, 0.35);
}

/* ── Section Label ───────────────────────────────────────── */
.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  margin-bottom: 0.8rem;
}

/* ── Form ────────────────────────────────────────────────── */
.field-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  margin-bottom: 1rem;
}

.field:last-child { margin-bottom: 0; }

label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

input[type="date"],
input[type="time"],
input[type="text"],
input[type="number"] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.6rem 0.8rem;
  width: 100%;
  transition: border-color 0.15s;
  color-scheme: dark;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

button[type="submit"] {
  background: var(--accent);
  border: none;
  border-radius: 7px;
  color: #fff;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 0.75rem;
  padding: 0.75rem 1.5rem;
  width: 100%;
  transition: background 0.15s, transform 0.1s;
}

button[type="submit"]:hover  { background: var(--accent2); }
button[type="submit"]:active { transform: scale(0.98); }

button[type="submit"]:disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
  transform: none;
}

/* ── Place Input Group ───────────────────────────────────── */
.place-input-group {
  position: relative;
  margin-bottom: 1rem;
}

.place-input-group #place-field {
  margin-bottom: 0;
}

/* ── Place Controls Row ───────────────────────────────────── */
.place-controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.3rem;
  margin-bottom: 0;
}

.coord-toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--accent2);
}

.coord-toggle-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.map-actions-block {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.9rem;
}

/* ── Field Error ─────────────────────────────────────────── */
input.input-error {
  border-color: var(--red);
  background: rgba(248, 113, 113, 0.06);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.15);
}

input.input-error:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.2);
}

/* ── Live Indicator ──────────────────────────────────────── */
.live-indicator {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  font-size: 0.72rem;
  color: var(--muted);
  user-select: none;
  margin-top: 0.1rem;
}

.live-indicator-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--green);
  animation: timer-pulse 1.4s ease-in-out infinite;
  flex-shrink: 0;
}

.live-time-text {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text);
  opacity: 0.55;
}

.live-use-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--accent2);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.72rem;
  padding: 0.1rem 0.4rem;
  line-height: 1.4;
  transition: border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.live-use-btn:hover {
  border-color: var(--accent2);
  color: var(--text);
}

/* ── Calc Timer ──────────────────────────────────────────── */
.calc-timer {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.65rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.calc-timer.visible { display: flex; }

.calc-timer-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--solar);
  animation: timer-pulse 1s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes timer-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.25; }
}

.calc-timer-value {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--solar);
  min-width: 3.5ch;
}

/* ── Autocomplete Dropdown ───────────────────────────────── */
#place-field { position: relative; }

.autocomplete-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-top: none;
  border-radius: 0 0 9px 9px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  z-index: 100;
  overflow: hidden;
}

/* Flatten input bottom radius when dropdown is open */
#place-field:has(.autocomplete-dropdown[style*="block"]) #place_name {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.autocomplete-item {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

.autocomplete-item:last-child { border-bottom: none; }

.autocomplete-item:hover,
.autocomplete-item.active { background: rgba(108, 142, 191, 0.12); }

.autocomplete-flag {
  font-size: 1.15rem;
  line-height: 1;
  flex-shrink: 0;
}

.autocomplete-name {
  font-size: 0.88rem;
  color: var(--text);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.autocomplete-type {
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  flex-shrink: 0;
  text-transform: capitalize;
  font-family: var(--mono);
}

.autocomplete-empty {
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.autocomplete-suggested {
  font-size: 0.68rem;
  color: var(--solar);
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  flex-shrink: 0;
  font-family: var(--mono);
  letter-spacing: 0.01em;
}

/* ── Map Action Buttons ──────────────────────────────────── */
.map-action-btn {
  display: flex;
  align-items: center;
  gap: 0.38rem;
  background: none;
  border: none;
  color: var(--accent2);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0;
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.map-action-btn:hover { color: var(--text); }
.map-action-btn:hover .icon { opacity: 1; transform: translateY(-1px); }
.map-action-btn:disabled { color: var(--muted); cursor: default; text-decoration: none; }

.icon {
  flex-shrink: 0;
  opacity: 0.82;
  transition: opacity 0.15s, transform 0.15s;
}

/* ── Location Error ──────────────────────────────────────── */
#location-error {
  display: none;
  color: var(--red);
  font-size: 0.82rem;
  margin-bottom: 0.75rem;
  padding: 0.45rem 0.75rem;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.25);
  border-radius: 6px;
  line-height: 1.5;
}

/* ── Map Panel ───────────────────────────────────────────── */
.map-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease, margin-bottom 0.35s ease, border-color 0.15s;
  margin-bottom: 0;
}

.map-panel.map-panel-open {
  max-height: 430px;
  margin-bottom: var(--gap);
}

#map-leaflet {
  height: 360px;
  width: 100%;
  display: block;
  background: #111318;
}

.map-panel-footer {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.85rem;
  border-top: 1px solid var(--border);
  min-height: 38px;
}

.map-label {
  font-size: 0.79rem;
  color: var(--muted);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-style: italic;
}

.map-label.map-label-loading {
  color: var(--accent);
  font-style: normal;
}

.map-close-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.78rem;
  padding: 0.2rem 0.55rem;
  flex-shrink: 0;
  transition: border-color 0.15s, color 0.15s;
}

.map-close-btn:hover { border-color: var(--accent); color: var(--text); }

/* ── Error Card ──────────────────────────────────────────── */
.error-card {
  background: rgba(248, 113, 113, 0.1);
  border-color: var(--red);
  color: var(--red);
}

/* ── Ambiguity Picker ────────────────────────────────────── */
.ambiguity-card { border-color: rgba(251, 191, 36, 0.4); }

.ambiguity-message {
  color: var(--solar);
  font-weight: 600;
  margin-bottom: 1rem;
}

.candidate-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.candidate-block {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  cursor: pointer;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  transition: border-color 0.15s, background 0.15s;
}

.candidate-block:hover {
  border-color: var(--accent);
  background: rgba(108, 142, 191, 0.06);
}

.candidate-block:has(input[type="radio"]:checked) {
  border-color: var(--solar);
  background: rgba(251, 191, 36, 0.05);
}

.candidate-radio {
  padding-top: 0.2rem;
  flex-shrink: 0;
}

.candidate-radio input[type="radio"] {
  accent-color: var(--solar);
  width: 1rem;
  height: 1rem;
}

.candidate-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
}

.candidate-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
  line-height: 1.4;
}

.candidate-flag { font-size: 1.3rem; line-height: 1; }

.candidate-place {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}

.candidate-country-name {
  font-size: 0.95rem;
  color: var(--accent2);
  font-weight: 700;
}

.candidate-coords-block {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  margin-top: 0.2rem;
  padding-left: 0.05rem;
}

.candidate-coord-line {
  display: flex;
  gap: 0.5rem;
  font-size: 0.82rem;
}

.coord-label { color: var(--muted); min-width: 72px; }

.coord-value {
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
}

/* ── Cache Layers (dev) ──────────────────────────────────── */
.cache-layers {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  padding: 0.45rem 0.75rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

.cache-layer {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
}

.cache-layer-label { color: var(--muted); font-weight: 500; white-space: nowrap; }

.cache-layer-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.cache-layer-hit {
  color: var(--accent);
  background: rgba(108, 142, 191, 0.12);
  border: 1px solid rgba(108, 142, 191, 0.3);
}

.cache-layer-miss {
  color: var(--solar);
  background: rgba(251, 191, 36, 0.07);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

.cache-layer-not_applicable {
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

/* ── Result Hero ─────────────────────────────────────────── */
.result-hero {
  text-align: center;
  padding: 0.5rem 0 2rem;
}

.hero-eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--solar);
  opacity: 0.7;
  margin-bottom: 0.9rem;
}

.hero-time {
  font-family: var(--mono);
  font-size: 3.25rem;
  font-weight: 700;
  color: var(--solar);
  letter-spacing: 0.02em;
  line-height: 1;
  margin-bottom: 0.7rem;
}

.hero-meta {
  font-size: 0.88rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.hero-sep { opacity: 0.35; }

/* ── Comparison Strip ────────────────────────────────────── */
.comparison-strip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
}

.cmp-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.cmp-col-solar { align-items: flex-end; }

.cmp-eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.cmp-time {
  font-family: var(--mono);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.cmp-time-solar { color: var(--solar); }

.cmp-sub {
  font-size: 0.76rem;
  color: var(--muted);
}

.cmp-arrow {
  color: var(--muted);
  font-size: 1.1rem;
  flex-shrink: 0;
  padding: 0 0.25rem;
}

/* ── Details Grid ────────────────────────────────────────── */
.details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2.5rem;
}

.detail-rows {
  display: flex;
  flex-direction: column;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.32rem 0;
  border-bottom: 1px solid rgba(42, 45, 62, 0.6);
}

.detail-row:last-child { border-bottom: none; }

.detail-label {
  font-size: 0.8rem;
  color: var(--muted);
  flex-shrink: 0;
}

.detail-value {
  font-size: 0.88rem;
  color: var(--text);
  text-align: right;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.detail-value.detail-mono {
  font-family: var(--mono);
  font-size: 0.82rem;
}

.detail-value.detail-muted { color: var(--muted); }
.detail-value.detail-sm { font-size: 0.78rem; }
.detail-value.detail-warning { color: var(--red); font-size: 0.8rem; }

/* ── Diff List ───────────────────────────────────────────── */
.diff-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.diff-item,
.diff-total {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  font-size: 0.88rem;
  padding: 0.35rem 0;
}

.diff-item {
  border-bottom: 1px solid rgba(42, 45, 62, 0.5);
}

.diff-total {
  margin-top: 0.25rem;
  padding-top: 0.25rem;
  font-weight: 600;
}

.diff-item-lv {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  flex-shrink: 0;
  min-width: 12.25rem;
}

.diff-item-label {
  color: var(--muted);
  white-space: nowrap;
}

.diff-total .diff-item-label { color: var(--text); }

.diff-item-value {
  display: inline-flex;
  align-items: baseline;
  justify-content: flex-end;
  gap: 0.16rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 4.6rem;
  flex-shrink: 0;
  white-space: nowrap;
  text-align: right;
}

.diff-num { display: inline-block; }

.diff-unit {
  font-weight: 400;
  opacity: 0.62;
  font-size: 0.78rem;
}

.diff-pos  { color: var(--green); }
.diff-neg  { color: var(--red); }
.diff-zero { color: var(--muted); }

.diff-total .diff-item-value { color: var(--solar); }
.diff-total { font-size: 0.92rem; }

.diff-item-note {
  color: #6b7280;
  font-size: 0.78rem;
  flex: 1;
  min-width: 0;
  max-width: 18rem;
}

/* ── Solar Pair (side-by-side) ───────────────────────────── */
.solar-pair-title {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--muted);
  opacity: 0.85;
  margin-top: 1.1rem;
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
}

.solar-pair {
  display: flex;
  gap: 1rem;
  margin-top: 0;
  align-items: flex-start;
}

.solar-pair-item {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.diagram-caption {
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.55;
  margin-top: 0.4rem;
  text-align: center;
  letter-spacing: 0.03em;
}

/* ── Solar Diagram ───────────────────────────────────────── */
.solar-diagram {
  margin-top: 0;
  display: flex;
  justify-content: center;
  width: 100%;
}

#solar-canvas {
  display: block;
  width: 100%;
  max-width: 500px;
  height: 260px;
  border-radius: 10px;
}

/* ── Timezone Explain Row ────────────────────────────────── */
.tz-explain-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.tz-explain-row strong {
  color: var(--text);
  font-weight: 600;
}

.tz-explain-sep {
  opacity: 0.35;
}

/* ── Sky Dome Diagram ────────────────────────────────────── */
.sky-dome-diagram {
  margin-top: 0;
  display: flex;
  justify-content: center;
  width: 100%;
}

#sky-canvas {
  display: block;
  width: 100%;
  max-width: 500px;
  height: 260px;
  border-radius: 10px;
}

/* ── Earth Tilt Diagram ──────────────────────────────────── */
.tilt-diagram {
  margin-top: 0;
  display: flex;
  justify-content: center;
  width: 100%;
}

#tilt-canvas {
  display: block;
  width: 100%;
  max-width: 500px;
  height: 240px;
  border-radius: 10px;
}

.tilt-seasonal {
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--solar);
  margin-top: 0.55rem;
  letter-spacing: 0.02em;
}

.tilt-caption {
  text-align: center;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.65;
  margin: 0.35rem auto 0.75rem;
  max-width: 420px;
  line-height: 1.5;
}

/* ── Solar Diagram Note ──────────────────────────────────── */
.solar-diagram-note {
  text-align: center;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.6;
  margin-top: 0.5rem;
}

/* ── Longitude Explain Block ─────────────────────────────── */
.lng-explain-block {
  margin-top: 0.85rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.82rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.6;
}

.lng-explain-block strong {
  color: var(--text);
  font-weight: 600;
}

.tz-diff-note {
  color: var(--muted);
  font-size: 0.78rem;
}

/* ── Timezone Diagram ────────────────────────────────────── */
.tz-diagram {
  margin-top: 0.85rem;
  display: flex;
  justify-content: center;
}

#tz-canvas {
  display: block;
  width: 100%;
  max-width: 500px;
  height: 160px;
  border-radius: 8px;
}

.tz-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 0.3rem;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.55;
  letter-spacing: 0.01em;
}

.tz-footer-left {
  text-align: left;
}

.tz-footer-right {
  text-align: right;
  opacity: 0.8;
}

/* ── Formula Row ─────────────────────────────────────────── */
.formula-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.formula-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.formula-code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--accent2);
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.5rem 0.85rem;
  flex: 1;
  white-space: pre-wrap;
}

/* ── Explanation Card ────────────────────────────────────── */
.explanation-body {
  margin-bottom: 1.25rem;
}

.explanation-body p {
  color: var(--text);
  font-size: 0.93rem;
  line-height: 1.75;
  margin-bottom: 0.7rem;
}

.explanation-body p:last-child { margin-bottom: 0; }

/* ── Detail Section (inside technical-details) ───────────── */
.detail-section {
  padding-top: 1.5rem;
  margin-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* ── Toggle Button ───────────────────────────────────────── */
.toggle-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--accent2);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  letter-spacing: 0.01em;
}

.toggle-btn:hover {
  background: rgba(108, 142, 191, 0.08);
  border-color: var(--accent);
  color: var(--text);
}

.toggle-btn:active { transform: scale(0.97); }

/* ── Prose ───────────────────────────────────────────────── */
.prose p {
  color: #a0aec0;
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 0.65rem;
}

.prose p:last-child { margin-bottom: 0; }

/* ── Muted helper ────────────────────────────────────────── */
.muted { color: var(--muted); }

/* ── Confidence Badge ────────────────────────────────────── */
.confidence {
  display: inline-block;
  border-radius: 5px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.75rem;
  text-transform: uppercase;
}

.confidence-high   { background: rgba(52, 211, 153, 0.15); color: var(--green); border: 1px solid rgba(52,211,153,0.35); }
.confidence-medium { background: rgba(251, 191, 36, 0.12); color: var(--solar); border: 1px solid rgba(251,191,36,0.35); }
.confidence-low    { background: rgba(248, 113, 113, 0.12); color: var(--red);  border: 1px solid rgba(248,113,113,0.35); }

/* ── Coverage Tag ────────────────────────────────────────── */
.coverage-tag {
  display: inline-block;
  border-radius: 4px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.1rem 0.4rem;
  text-transform: uppercase;
  margin-left: 0.5rem;
  vertical-align: middle;
  font-family: var(--mono);
}

.coverage-hit            { background: rgba(52,211,153,0.15);  color: var(--green); border: 1px solid rgba(52,211,153,0.3); }
.coverage-miss           { background: rgba(251,191,36,0.12);  color: var(--solar); border: 1px solid rgba(251,191,36,0.3); }
.coverage-not_applicable { background: rgba(107,114,128,0.12); color: var(--muted); border: 1px solid var(--border); }

/* ── Confidence Bullets ──────────────────────────────────── */
.conf-bullets {
  list-style: none;
  margin-top: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.conf-bullets li {
  font-size: 0.85rem;
  color: var(--muted);
  padding-left: 1.1rem;
  position: relative;
  line-height: 1.5;
}

.conf-bullets li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 1.1rem;
  line-height: 1.3;
}

/* ── Confidence Explanation ──────────────────────────────── */
.conf-explain-row {
  margin-top: 0.55rem;
}

.conf-explain-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  font-family: var(--font);
  line-height: 1.5;
}

.conf-explain-btn:hover {
  color: var(--accent2);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.conf-explain-panel {
  margin-top: 0.7rem;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  color: #a0aec0;
  line-height: 1.65;
}

.conf-explain-panel p + p {
  margin-top: 0.55rem;
}

.conf-explain-framing {
  color: var(--muted);
  font-style: italic;
  margin-bottom: 0.55rem;
}

/* ── Performance Breakdown (dev) ─────────────────────────── */
.perf-block { margin-top: 0.25rem; }

.perf-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
}

.perf-row td {
  padding: 0.22rem 0;
  font-size: 0.82rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.perf-row:last-child td { border-bottom: none; }

.perf-label { color: var(--muted); width: 60%; }

.perf-value {
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-align: right;
  opacity: 0.75;
}

.perf-total-row td {
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  font-weight: 600;
}

.perf-total-row .perf-label { color: var(--text); }
.perf-total-row .perf-value { opacity: 1; color: var(--accent2); }

/* ── Recent Calculations (dev) ───────────────────────────── */
.recent-card h2 {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.recent-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.recent-item {
  cursor: pointer;
  padding: 0.55rem 0.75rem;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  transition: border-color 0.15s, background 0.15s;
}

.recent-item:hover {
  border-color: var(--accent);
  background: rgba(108, 142, 191, 0.06);
}

.recent-place {
  font-size: 0.88rem;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 0.15rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recent-meta {
  font-size: 0.76rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.recent-sep { opacity: 0.4; }

.recent-empty {
  font-size: 0.82rem;
  color: var(--muted);
  text-align: center;
  padding: 0.4rem 0;
}

/* ── Completion Time ─────────────────────────────────────── */
.completion-time {
  text-align: right;
  padding-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--muted);
  opacity: 0.6;
  letter-spacing: 0.01em;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 520px) {
  .field-row { flex-direction: column; gap: 0; }
  .details-grid { grid-template-columns: 1fr; gap: 1.5rem 0; }
  .comparison-strip { flex-direction: column; gap: 0.5rem; }
  .cmp-col-solar { align-items: flex-start; }
  .hero-time { font-size: 2.5rem; }
  .diff-item { flex-wrap: wrap; }
  .diff-item-lv { width: auto; }
  .diff-item-note { flex-basis: 100%; padding-top: 0.1rem; }
  .formula-row { flex-direction: column; align-items: flex-start; }
  .formula-code { width: 100%; }
  .solar-pair { flex-direction: column; }
  .solar-pair-item { width: 100%; }
}

/* ── A/B Carousel (Variant B) ────────────────────────────── */

/* Variant B: hide the hr that sits before the first slide */
html[data-variant="B"] .carousel-pre-hr { display: none; }

/* Carousel outer — position anchor for the right-nav pill */
.carousel-outer {
  position: relative;
}

/* Slide base layout — flex column, always visible in variant A */
.carousel-slide {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.4rem 3rem 0.5rem 3rem;
  box-sizing: border-box;
  height: 310px;
  overflow: hidden;
}

/* Variant B: hide all slides, show only the active one */
html[data-variant="B"] .carousel-wrapper .carousel-slide               { display: none; }
html[data-variant="B"] .carousel-wrapper .carousel-slide.carousel-active { display: flex; }

/* Slide anatomy */
.slide-title {
  width: 100%;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.35rem;
  text-align: left;
}

.slide-visual {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.slide-meta {
  font-size: 0.82rem;
  color: var(--accent2);
  margin-top: 0.4rem;
  text-align: center;
  min-height: 1.2em;
}

.slide-subtitle {
  font-size: 0.78rem;
  color: var(--muted);
  text-align: center;
  margin-top: 0.25rem;
  max-width: 40ch;
}

/* Navigation pills (left + right) ─────────────────────── */
.carousel-left-nav,
.carousel-right-nav {
  display: none;          /* hidden in variant A */
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2.4rem;
  align-items: center;
  justify-content: center;
}

.carousel-left-nav  { left: 0; }
.carousel-right-nav { right: 0; }

html[data-variant="B"] .carousel-left-nav,
html[data-variant="B"] .carousel-right-nav { display: flex; }

.carousel-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--accent2);
  cursor: pointer;
  font-family: var(--font);
  font-size: 1.1rem;
  line-height: 1;
  padding: 3.6rem 0.55rem;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-pill:hover {
  background: rgba(108, 142, 191, 0.1);
  border-color: var(--accent);
  color: var(--text);
}

.carousel-pill.pill-pulse {
  animation: pill-pulse 0.7s ease-out forwards;
}

@keyframes pill-pulse {
  0%   { box-shadow: 0 0 0 0    rgba(108, 142, 191, 0.55); }
  50%  { box-shadow: 0 0 0 8px  rgba(108, 142, 191, 0.20); }
  100% { box-shadow: 0 0 0 14px rgba(108, 142, 191, 0); }
}

/* Dev variant badge ────────────────────────────────────── */
.ab-dev-badge {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--border);
  margin-left: 0.35rem;
  opacity: 0.45;
  user-select: none;
}

/* ── Result Reveal Animation ─────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.35s ease-out, transform 0.35s ease-out;
}

.reveal.reveal-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── Utility ─────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Share Card Trigger ──────────────────────────────────── */
.share-card-trigger {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: var(--gap);
}

.png-error-msg {
  display: block;
  width: 100%;
  text-align: center;
  font-size: 0.74rem;
  color: #e07070;
  margin-top: 0.25rem;
}

.share-card-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.45rem 1.1rem;
  transition: border-color 0.15s, color 0.15s;
  letter-spacing: 0.01em;
}

.share-card-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* ── Share Card ──────────────────────────────────────────── */
.share-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  border-top-color: rgba(251, 191, 36, 0.3);
  padding: 1.5rem;
  width: 100%;
  max-width: 420px;
  margin: 0 auto var(--gap);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Header row */
.sc-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.sc-location {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.sc-date {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Hero */
.sc-hero {
  text-align: center;
  padding: 0.25rem 0;
}

.sc-time {
  font-family: var(--mono);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--solar);
  letter-spacing: 0.02em;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.sc-time-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--solar);
  opacity: 0.6;
}

/* Summary line */
.sc-summary {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--accent2);
  letter-spacing: 0.01em;
  opacity: 0.85;
  margin-bottom: 0.15rem;
}

.sc-summary-helper {
  text-align: center;
  font-size: 0.64rem;
  color: var(--muted);
  opacity: 0.45;
  letter-spacing: 0.02em;
  margin-top: 0;
}

/* Mini details */
.sc-details {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sc-detail-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.3rem 0.2rem;
  border-bottom: 1px solid rgba(42, 45, 62, 0.3);
}

.sc-detail-row:last-child { border-bottom: none; }

.sc-detail-label {
  font-size: 0.76rem;
  color: var(--muted);
  flex-shrink: 0;
}

.sc-detail-value {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text);
  text-align: right;
}

/* Visual */
.sc-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sc-visual-label {
  font-size: 0.6rem;
  color: var(--muted);
  opacity: 0.35;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 0.4rem;
}

#share-card-canvas {
  display: block;
  width: 100%;
  max-width: 410px;
  height: 184px;
  border-radius: 8px;
}

/* Footer */
.sc-footer {
  text-align: center;
  font-size: 0.62rem;
  color: var(--muted);
  opacity: 0.4;
  letter-spacing: 0.04em;
  padding-top: 0.2rem;
  border-top: 1px solid rgba(42, 45, 62, 0.25);
}

/* ── Site Navigation ─────────────────────────────────────── */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.site-nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
  letter-spacing: 0.01em;
}

.site-nav-link:hover {
  color: var(--accent2);
  background: rgba(138, 180, 248, 0.07);
}

.site-nav-active {
  color: var(--text);
}

.site-nav-cta {
  color: var(--accent2);
  border: 1px solid rgba(108, 142, 190, 0.35);
  padding: 0.28rem 0.7rem;
}

.site-nav-cta:hover {
  background: rgba(108, 142, 190, 0.12);
  border-color: var(--accent2);
  color: var(--accent2);
}

.site-nav-sep {
  display: inline-block;
  width: 1px;
  height: 14px;
  background: var(--border);
  margin: 0 0.1rem;
  vertical-align: middle;
  flex-shrink: 0;
}

/* ── API Section ─────────────────────────────────────────── */
.api-section {
  margin-top: 2.5rem;
  border-top-color: rgba(108, 142, 190, 0.3);
}

.api-section-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.api-section-icon {
  font-family: var(--mono);
  font-size: 1.3rem;
  color: var(--accent2);
  line-height: 1.3;
  flex-shrink: 0;
  opacity: 0.75;
}

.api-section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.api-section-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.api-curl-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.api-curl-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.85rem;
  border-bottom: 1px solid var(--border);
}

.api-curl-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.api-copy-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  transition: color 0.15s, border-color 0.15s;
}

.api-copy-btn:hover {
  color: var(--accent2);
  border-color: var(--accent);
}

.api-curl-pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--text);
  white-space: pre;
}

.api-curl-pre code {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
}

.api-section-actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.api-btn {
  display: inline-block;
  text-decoration: none;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 7px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  letter-spacing: 0.01em;
}

.api-btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid transparent;
}

.api-btn-primary:hover {
  background: var(--accent2);
}

.api-btn-secondary {
  background: transparent;
  color: var(--accent2);
  border: 1px solid rgba(108, 142, 190, 0.4);
}

.api-btn-secondary:hover {
  background: rgba(108, 142, 190, 0.1);
  border-color: var(--accent2);
}

/* ── Developer Callout ───────────────────────────────────── */
.dev-callout {
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.5rem;
  margin-bottom: 2rem;
  letter-spacing: 0.01em;
}

.dev-callout-icon {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent2);
  opacity: 0.6;
  margin-right: 0.4rem;
}

/* ── API Docs top card (Contents + Overview in one card) ─── */
.docs-top-card {
  display: grid;
  grid-template-columns: 320px 1px 1fr;
  gap: 0;
  align-items: start;
  padding: 0;  /* override .card padding; children own their padding */
}

.docs-contents,
.docs-overview {
  min-width: 0;
  padding: var(--card-pad);
}

.docs-top-divider {
  width: 1px;
  background: var(--border);
  align-self: stretch;
}

@media (max-width: 900px) {
  .docs-top-card {
    grid-template-columns: 1fr;
  }

  .docs-top-divider {
    display: none;
  }

  .docs-contents,
  .docs-overview {
    padding: 1.5rem;
  }

  .docs-contents {
    border-bottom: 1px solid var(--border);
  }
}