/* ── Variables ─────────────────────────────────────────────────── */
:root {
  --bg: #0d0d14;
  --surface: rgba(255,255,255,0.05);
  --surface-hover: rgba(255,255,255,0.09);
  --surface-active: rgba(255,255,255,0.12);
  --border: rgba(255,255,255,0.1);
  --accent: #7c6af7;
  --accent2: #4ec9f0;
  --text: #e8e8f0;
  --muted: rgba(255,255,255,0.45);
  --result-bg: rgba(124,106,247,0.15);
  --result-border: rgba(124,106,247,0.4);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 16px;
  --card-shadow: 0 4px 24px rgba(0,0,0,0.35);
}
[data-theme="light"] {
  --bg: #f0f0f8;
  --surface: rgba(255,255,255,0.7);
  --surface-hover: rgba(255,255,255,0.85);
  --surface-active: rgba(255,255,255,0.95);
  --border: rgba(0,0,0,0.1);
  --text: #1a1a2e;
  --muted: rgba(0,0,0,0.45);
  --result-bg: rgba(124,106,247,0.1);
  --result-border: rgba(124,106,247,0.35);
  --shadow: 0 8px 32px rgba(0,0,0,0.1);
  --card-shadow: 0 4px 24px rgba(0,0,0,0.1);
}
[data-theme="amoled"] {
  --bg: #000;
  --surface: rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.07);
  --surface-active: rgba(255,255,255,0.1);
  --border: rgba(255,255,255,0.08);
  --text: #ffffff;
  --muted: rgba(255,255,255,0.4);
  --result-bg: rgba(124,106,247,0.12);
  --card-shadow: 0 4px 24px rgba(0,0,0,0.8);
}

/* ── Reset & Base ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

/* ── Background gradient ────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: -1;
  background: radial-gradient(ellipse 80% 60% at 20% 0%, rgba(124,106,247,0.15) 0%, transparent 60%),
              radial-gradient(ellipse 60% 50% at 80% 80%, rgba(78,201,240,0.1) 0%, transparent 60%);
  pointer-events: none;
}

/* ── Layout ─────────────────────────────────────────────────────── */
.app-header {
  max-width: 860px; margin: 0 auto;
  padding: 48px 20px 24px;
  display: flex; flex-direction: column; gap: 6px;
}
.app-header h1 {
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  font-weight: 800; letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.app-header p { color: var(--muted); font-size: 1rem; }

.toolbar {
  max-width: 860px; margin: 0 auto 16px;
  padding: 0 20px;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.theme-group { display: flex; gap: 4px; }
.theme-btn {
  padding: 6px 14px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  font-size: 0.78rem; font-weight: 500; transition: all 0.2s;
}
.theme-btn:hover, .theme-btn.active {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn-icon {
  padding: 7px 14px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  font-size: 0.82rem; transition: all 0.2s;
}
.btn-icon:hover { background: var(--surface-hover); }
.palette-trigger-btn {
  margin-left: auto; padding: 7px 16px; border-radius: 20px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--muted); cursor: pointer; font-size: 0.82rem;
  display: flex; align-items: center; gap: 6px; transition: all 0.2s;
}
.palette-trigger-btn:hover { border-color: var(--accent); color: var(--text); }
.palette-trigger-btn kbd {
  background: var(--border); padding: 1px 6px; border-radius: 4px; font-size: 0.75rem;
}

main { max-width: 860px; margin: 0 auto; padding: 0 20px 60px; }

/* ── Converter Cards ─────────────────────────────────────────────── */
#cards-grid { display: flex; flex-direction: column; gap: 12px; }

.converter-card {
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.converter-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.converter-card.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow); }
.converter-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.card-header {
  padding: 18px 20px; display: flex; align-items: center; gap: 14px; cursor: pointer;
  user-select: none;
}
.card-icon { font-size: 1.5rem; width: 36px; text-align: center; }
.card-meta { flex: 1; }
.card-title { font-weight: 700; font-size: 1.05rem; }
.card-desc { font-size: 0.8rem; color: var(--muted); margin-top: 1px; }
.fav-btn {
  background: none; border: none; color: var(--muted); cursor: pointer;
  font-size: 1.2rem; padding: 4px; transition: color 0.2s, transform 0.2s; line-height: 1;
}
.fav-btn:hover, .fav-btn.active { color: #f5c518; transform: scale(1.2); }

.card-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
}
.converter-card.active .card-body { max-height: 900px; }

/* ── Converter Body ──────────────────────────────────────────────── */
.converter-body { padding: 0 20px 20px; display: flex; flex-direction: column; gap: 16px; }

.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-group label {
  font-size: 0.8rem; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.06em;
  display: flex; align-items: center; gap: 6px;
}
.unit-tag {
  font-size: 0.72rem; background: var(--accent); color: #fff;
  padding: 1px 6px; border-radius: 4px; text-transform: none; letter-spacing: 0;
}
input[type="number"], input[type="date"], input[type="time"], select {
  width: 100%; padding: 10px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface-active);
  color: var(--text); font-size: 1rem; font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  -moz-appearance: textfield;
}
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,106,247,0.2); }

input[type="range"] {
  width: 100%; height: 4px; -webkit-appearance: none;
  background: var(--border); border-radius: 2px; border: none; padding: 0;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer; transition: transform 0.15s;
  box-shadow: 0 0 8px rgba(124,106,247,0.5);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.3); }

/* ── Result Card ─────────────────────────────────────────────────── */
.result-card {
  background: var(--result-bg); border: 1px solid var(--result-border);
  border-radius: 12px; padding: 16px 20px;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.result-label { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; min-width: 40px; }
.result-value {
  font-size: 1.8rem; font-weight: 800; color: var(--accent);
  font-variant-numeric: tabular-nums; flex: 1;
  transition: color 0.2s;
}
.result-value.flash { animation: flashPulse 0.3s ease; }
.result-value.copied { color: var(--accent2); }
@keyframes flashPulse {
  0% { transform: scale(1); }
  40% { transform: scale(1.08); color: var(--accent2); }
  100% { transform: scale(1); }
}
.copy-btn {
  background: var(--surface); border: 1px solid var(--border); color: var(--muted);
  border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 1rem;
  transition: all 0.2s;
}
.copy-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── Action / Preset rows ────────────────────────────────────────── */
.action-row, .preset-row { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-secondary {
  padding: 8px 16px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); cursor: pointer; font-size: 0.85rem;
  transition: all 0.2s;
}
.btn-secondary:hover { background: var(--surface-hover); border-color: var(--accent); }
.preset-btn {
  padding: 6px 14px; border-radius: 20px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); cursor: pointer; font-size: 0.82rem;
  transition: all 0.18s;
}
.preset-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: scale(1.04); }

/* ── Preview text (px↔rem) ───────────────────────────────────────── */
.preview-text {
  padding: 12px 16px; border-radius: 10px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); transition: font-size 0.2s; word-break: break-word;
}

/* ── Weight toggle ───────────────────────────────────────────────── */
.scale-icon { font-size: 2.5rem; text-align: center; transition: transform 0.4s; }
.scale-icon.wobble { animation: wobble 0.4s ease; }
@keyframes wobble {
  0%,100% { transform: rotate(0); }
  25% { transform: rotate(-8deg) scale(1.1); }
  75% { transform: rotate(8deg) scale(1.1); }
}
.toggle-row {
  display: flex; align-items: center; gap: 14px; justify-content: center;
  font-weight: 700; font-size: 1rem;
}
.elastic-toggle {
  width: 52px; height: 28px; border-radius: 14px;
  background: var(--accent); border: none; cursor: pointer;
  position: relative; transition: background 0.3s;
}
.elastic-toggle::after {
  content: ''; position: absolute; top: 4px; left: 4px;
  width: 20px; height: 20px; border-radius: 50%; background: #fff;
  transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.elastic-toggle.on { background: var(--accent2); }
.elastic-toggle.on::after { transform: translateX(24px); }
.precision-row {
  display: flex; align-items: center; gap: 10px;
}
.precision-row label { font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.precision-row select { width: auto; }

/* ── Timezone ────────────────────────────────────────────────────── */
.tz-grid, .dpi-grid, .aspect-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tz-result-card { flex-wrap: wrap; }
.tz-output { font-size: 1.2rem; font-weight: 700; color: var(--accent); flex: 1; min-width: 180px; }
.tz-output.flash { animation: flashPulse 0.3s ease; }
.day-badge {
  padding: 4px 10px; border-radius: 20px; font-size: 0.78rem; font-weight: 700;
}
.day-badge.plus { background: rgba(78,201,240,0.15); color: var(--accent2); border: 1px solid var(--accent2); }
.day-badge.minus { background: rgba(247,107,114,0.15); color: #f76b72; border: 1px solid #f76b72; }
.day-badge.hidden { display: none; }
.tz-clocks { display: flex; gap: 24px; justify-content: center; padding: 8px 0; }
.clock-face { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.clock-circle { fill: none; stroke: var(--border); stroke-width: 2; }
.clock-hour { stroke: var(--text); stroke-width: 3; stroke-linecap: round; transition: transform 0.5s ease; }
.clock-min { stroke: var(--accent); stroke-width: 2; stroke-linecap: round; transition: transform 0.5s ease; }
.clock-dot { fill: var(--accent); }
.clock-label { font-size: 0.72rem; color: var(--muted); text-align: center; max-width: 80px; word-break: break-word; }
.clock-time { font-size: 0.85rem; font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }

/* ── DPI ─────────────────────────────────────────────────────────── */
.dpi-result { flex-wrap: wrap; gap: 16px; }
.dpi-out { display: flex; flex-direction: column; gap: 2px; }
.dpi-out .result-value { font-size: 1.2rem; }

/* ── Aspect Ratio ────────────────────────────────────────────────── */
.lock-row { display: flex; justify-content: flex-start; }
.lock-btn {
  padding: 7px 16px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--muted); cursor: pointer; font-size: 0.85rem; transition: all 0.2s;
}
.lock-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.ar-preview-wrap { display: flex; justify-content: center; align-items: center; min-height: 80px; }
.ar-preview {
  background: linear-gradient(135deg, rgba(124,106,247,0.3), rgba(78,201,240,0.3));
  border: 2px solid var(--accent); border-radius: 6px;
  transition: width 0.3s cubic-bezier(0.34,1.56,0.64,1), height 0.3s cubic-bezier(0.34,1.56,0.64,1);
}

/* ── History Panel ───────────────────────────────────────────────── */
#history-panel {
  max-width: 860px; margin: 0 auto 16px; padding: 0 20px;
  max-height: 0; overflow: hidden; transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
}
#history-panel.open { max-height: 400px; }
.history-inner {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; max-height: 340px; overflow-y: auto;
}
.history-inner h3 { font-size: 0.85rem; color: var(--muted); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.06em; }
.history-item {
  display: flex; align-items: center; gap: 8px; padding: 7px 0;
  border-bottom: 1px solid var(--border); font-size: 0.88rem;
}
.history-item:last-child { border: none; }
.history-type { font-size: 0.72rem; background: var(--surface-active); padding: 2px 7px; border-radius: 4px; color: var(--accent); font-weight: 700; }
.history-from { color: var(--muted); }
.history-arrow { color: var(--accent); }
.history-to { font-weight: 600; }
.empty-state { color: var(--muted); font-size: 0.88rem; text-align: center; padding: 20px; }

/* ── Command Palette ─────────────────────────────────────────────── */
#palette {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: flex-start; justify-content: center; padding-top: 10vh;
  pointer-events: none; opacity: 0; transition: opacity 0.2s;
}
#palette.open { pointer-events: all; opacity: 1; }
#palette-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); backdrop-filter: blur(4px); z-index: -1; }
.palette-box {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 16px; width: min(580px, 90vw);
  box-shadow: 0 24px 80px rgba(0,0,0,0.5);
  overflow: hidden; transform: translateY(-12px) scale(0.97);
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1);
}
#palette.open .palette-box { transform: none; }
#palette-input {
  width: 100%; padding: 18px 20px; border: none; outline: none;
  background: transparent; color: var(--text); font-size: 1.1rem;
  border-bottom: 1px solid var(--border); font-family: inherit;
}
#palette-input::placeholder { color: var(--muted); }
#palette-results { padding: 8px 0; max-height: 320px; overflow-y: auto; }
.palette-item {
  padding: 11px 20px; cursor: pointer; display: flex; align-items: center; gap: 10px;
  font-size: 0.92rem; transition: background 0.12s;
}
.palette-item:hover { background: var(--surface-hover); }
.palette-hint { color: var(--muted); font-size: 0.78rem; margin-left: auto; }
.palette-empty { padding: 20px; text-align: center; color: var(--muted); font-size: 0.88rem; }

/* ── Scrollbar ───────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 520px) {
  .tz-grid, .dpi-grid, .aspect-grid { grid-template-columns: 1fr; }
  .result-value { font-size: 1.4rem; }
  .app-header { padding: 28px 16px 16px; }
  main, .toolbar, #history-panel { padding-left: 16px; padding-right: 16px; }
  .tz-clocks { gap: 16px; }
}

/* ── Reduced motion ──────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}