/* ═══════════════════════════════════════════════
   CSS Custom Properties
═══════════════════════════════════════════════ */
:root {
  --bg:           #111118;
  --surface:      #1c1c28;
  --surface2:     #252535;
  --border:       rgba(255,255,255,0.09);
  --accent:       #e94560;
  --accent-glow:  rgba(233,69,96,0.35);
  --accent2:      #4da6ff;
  --text:         #e8e8f0;
  --text-dim:     #6e6e8a;
  --text-faint:   #3e3e55;

  /* ruler */
  --ruler-bg:      #fffef2;
  --ruler-border:  #c9b88a;
  --ruler-tick:    #1e1e1e;
  --ruler-label:   #1e1e1e;
  --ruler-h:       80px;           /* thickness (height when horizontal) */

  --radius:        14px;
  --radius-sm:     8px;
  --ease:          cubic-bezier(.4,0,.2,1);
}

@media (max-width: 480px) {
  :root { --ruler-h: 66px; }
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  /* prevent double-tap zoom on mobile */
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

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

/* ═══════════════════════════════════════════════
   App container
═══════════════════════════════════════════════ */
#app {
  position: fixed;
  inset: 0;
}

/* ═══════════════════════════════════════════════
   Screen system
═══════════════════════════════════════════════ */
.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 28px 18px 40px;
}
.screen.active { display: flex; }

/* ═══════════════════════════════════════════════
   Welcome screen
═══════════════════════════════════════════════ */
.welcome-card {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20px;
}

.welcome-icon {
  font-size: 64px;
  line-height: 1;
  margin-bottom: 20px;
  filter: drop-shadow(0 4px 20px rgba(233,69,96,0.4));
}

.welcome-card h1 {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #ffffff 40%, #e94560);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.welcome-sub {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 36px;
}

/* method buttons */
.method-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.method-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: background .15s var(--ease), border-color .15s var(--ease), transform .1s;
}
.method-btn:hover  { background: var(--surface2); border-color: rgba(255,255,255,0.16); }
.method-btn:active { transform: scale(0.975); }

.method-btn.primary {
  border-color: rgba(233,69,96,.5);
  background: rgba(233,69,96,.1);
}
.method-btn.primary:hover { background: rgba(233,69,96,.18); }

.method-btn.dim { opacity: 0.55; }
.method-btn.dim:hover { opacity: 0.75; }

.method-icon { font-size: 1.5rem; flex-shrink: 0; }

.method-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.method-text strong { font-size: 0.92rem; font-weight: 600; }
.method-text small  { font-size: 0.77rem; color: var(--text-dim); }

/* ═══════════════════════════════════════════════
   Calibration screens — shared
═══════════════════════════════════════════════ */
.cal-header {
  width: 100%;
  max-width: 580px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-shrink: 0;
}
.cal-header h2 { font-size: 1.25rem; font-weight: 700; }

.back-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 0.85rem;
  padding: 5px 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s;
}
.back-btn:hover { background: rgba(233,69,96,.1); }

.cal-instructions {
  width: 100%;
  max-width: 580px;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 20px;
  text-align: center;
  flex-shrink: 0;
}

/* ── Stage (drag area) ── */
.cal-stage {
  position: relative;
  flex: 1;
  width: 100%;
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Credit card box */
.card-box {
  position: absolute;
  /* height controlled by JS — landscape gets 52px, portrait gets aspect-ratio height */
  background: linear-gradient(135deg, #1b3f72 0%, #2d6dbf 60%, #1b3f72 100%);
  border-radius: 7px;
  border: 1.5px solid rgba(255,255,255,.25);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 10px;
  pointer-events: none;
  user-select: none;
  box-shadow: 0 4px 24px rgba(0,0,0,.5);
  overflow: hidden;
}

.card-chip {
  width: 24px;
  height: 18px;
  background: linear-gradient(135deg, #f0c040, #c8960a);
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid rgba(0,0,0,.2);
}

.card-number-dots {
  flex: 1;
  height: 3px;
  background: repeating-linear-gradient(
    90deg, rgba(255,255,255,.35) 0 4px, transparent 4px 8px
  );
  border-radius: 2px;
}

.card-size-hint {
  font-size: 0.6rem;
  color: rgba(255,255,255,.5);
  white-space: nowrap;
  font-family: monospace;
  flex-shrink: 0;
}

/* Manual bar */
.manual-bar {
  position: absolute;
  height: 6px;
  background: var(--accent2);
  border-radius: 3px;
  box-shadow: 0 0 12px rgba(77,166,255,.4);
  pointer-events: none;
}

/* Drag handle (shared) */
.drag-handle {
  position: absolute;
  width: 30px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: ew-resize;
  touch-action: none;
  z-index: 20;
}

.handle-grip {
  width: 7px;
  height: 52px;
  background: var(--accent);
  border-radius: 4px;
  box-shadow: 0 0 16px var(--accent-glow);
  transition: transform .1s, box-shadow .1s;
}
.drag-handle:hover  .handle-grip { transform: scaleX(1.25); box-shadow: 0 0 22px var(--accent-glow); }
.drag-handle:active .handle-grip { transform: scaleX(1.4);  box-shadow: 0 0 28px var(--accent-glow); }

/* Live measurement label */
.live-label {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10,10,20,.8);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-family: monospace;
  color: #fff;
  pointer-events: none;
  white-space: nowrap;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ── Manual input row ── */
.manual-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 580px;
  margin-bottom: 16px;
  flex-shrink: 0;
}
.manual-input-row label { color: var(--text-dim); font-size: 0.85rem; }

#manual-mm {
  width: 90px;
  padding: 9px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  text-align: center;
  -moz-appearance: textfield;
}
#manual-mm::-webkit-outer-spin-button,
#manual-mm::-webkit-inner-spin-button { -webkit-appearance: none; }
#manual-mm:focus { outline: none; border-color: var(--accent2); }

.input-unit { color: var(--text-dim); font-size: 0.85rem; }

/* ── Footer / actions ── */
.cal-footer {
  width: 100%;
  max-width: 580px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-top: 18px;
  flex-shrink: 0;
}

.cal-hint {
  color: var(--text-dim);
  font-size: 0.8rem;
  text-align: center;
  line-height: 1.5;
}

.confirm-btn {
  width: 100%;
  max-width: 340px;
  padding: 15px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-size: 0.97rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.3px;
  transition: opacity .15s, transform .1s;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.confirm-btn:hover  { opacity: 0.92; }
.confirm-btn:active { opacity: 0.82; transform: scale(0.975); }

/* Confirm button placed inline in the cal-header row */
.header-confirm-btn {
  width: auto;
  padding: 8px 16px;
  font-size: 0.85rem;
  margin-left: auto;
  box-shadow: none;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════
   Confirm / accuracy screen
═══════════════════════════════════════════════ */
.confirm-stage {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.test-bar-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.test-bar {
  height: 22px;
  background: var(--accent);
  border-radius: 3px;
  position: relative;
  box-shadow: 0 0 18px var(--accent-glow);
}
.test-bar::before, .test-bar::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 2px;
  background: rgba(255,255,255,.7);
  border-radius: 1px;
}
.test-bar::before { left: 0; }
.test-bar::after  { right: 0; }

.test-bar-labels {
  width: 100%;
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  font-family: monospace;
  color: var(--text-dim);
}

.accuracy-note {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-align: center;
  font-family: monospace;
}

/* ═══════════════════════════════════════════════
   Ruler screen
═══════════════════════════════════════════════ */
#screen-ruler {
  padding: 0;
  overflow: hidden;
  background: #151515;
}

#ruler-wrap {
  position: absolute;
  top: 0;
  left: 0;
}

#ruler-svg { display: block; }

/* ── SVG inline styles (applied as attributes by ruler.js) ── */
/* Class selectors here target SVG elements via className attribute */

/* ── Floating toolbar ── */
#toolbar {
  position: fixed;
  bottom: env(safe-area-inset-bottom, 0px);
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(20,20,30,.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 50px;
  z-index: 100;
}

.tool-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s, border-color .15s, transform .1s;
  letter-spacing: 0;
}
.tool-btn:hover  { background: rgba(255,255,255,.13); border-color: rgba(255,255,255,.2); }
.tool-btn:active { transform: scale(0.9); background: rgba(255,255,255,.2); }

/* ── Device / screen info panel ── */
#info-panel {
  position: fixed;
  z-index: 90;
  pointer-events: none;
  user-select: none;
  line-height: 1.45;
}

/* Horizontal ruler (desktop): large centered block below the ruler */
#info-panel.orient-h {
  top: calc(var(--ruler-h) + 28px);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
#info-panel.orient-h #info-device {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}
#info-panel.orient-h #info-dot { display: none; }
#info-panel.orient-h #info-screen {
  font-size: 0.9rem;
  font-family: monospace;
  color: var(--text-dim);
}
#info-panel.orient-h #info-disclaimer {
  font-size: 0.7rem;
  color: #c8a84b;
  margin-top: 4px;
  letter-spacing: 0.1px;
}
#info-panel.orient-h #info-guide {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.8;
  margin-top: 14px;
  width: 100%;
  white-space: normal;
}
#info-panel.orient-v #info-guide { display: none; }
#info-panel.orient-h #info-disclaimer a {
  color: #e0c06a;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}
#info-panel.orient-h #info-disclaimer a:hover {
  color: #f0d080;
}

/* Vertical ruler (mobile): info sits to the right of the ruler, upper area */
#info-panel.orient-v {
  top: 18%;
  transform: none;
  left: calc(var(--ruler-h) + 14px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}
#info-panel.orient-v #info-device {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.1px;
}
#info-panel.orient-v #info-dot { display: none; }
#info-panel.orient-v #info-disclaimer { display: none; }
#info-panel.orient-v #info-screen {
  font-size: 0.75rem;
  font-family: monospace;
  color: var(--text-dim);
}

/* ── Calibration quality badge ── */
#cal-badge {
  position: fixed;
  top: 12px;
  right: 14px;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(255,255,255,.07);
  border: 1px solid var(--border);
  color: var(--text-dim);
  z-index: 100;
  letter-spacing: 0.3px;
  user-select: none;
}

/* ── Stale calibration banner ── */
#stale-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(180,60,40,.93);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8rem;
  font-weight: 500;
  z-index: 200;
}
#stale-banner button {
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  cursor: pointer;
  white-space: nowrap;
}

/* ── Fullscreen hint ── */
#fs-hint {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,.38);
  font-size: 0.72rem;
  letter-spacing: 0.3px;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 1s ease;
}
#fs-hint.fade-out { opacity: 0; }

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

/* ═══════════════════════════════════════════════
   Mobile adjustments
═══════════════════════════════════════════════ */
@media (max-width: 480px) {
  .welcome-card { padding-top: 8px; }
  .welcome-card h1 { font-size: 2rem; }
  .welcome-sub { font-size: 0.85rem; }
  .cal-instructions { font-size: 0.82rem; }
}

@media (max-height: 600px) {
  .welcome-icon { font-size: 40px; margin-bottom: 12px; }
  .welcome-card h1 { font-size: 1.8rem; }
  .welcome-sub { margin-bottom: 20px; }
}