:root {
  --bg: #0b1220;
  --bg-elevated: #121a2b;
  --card: #162033;
  --border: #243049;
  --text: #e8eef9;
  --muted: #8b9bb8;
  --primary: #3b82f6;
  --primary-press: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 16px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --nav-h: 72px;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; background: var(--bg); color: var(--text); }
body { -webkit-tap-highlight-color: transparent; }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
input, textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  outline: none;
}
input:focus, textarea:focus { border-color: var(--primary); }
label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 12px;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 0.8rem; }

#app { min-height: 100dvh; }

/* Auth */
#view-auth {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background:
    radial-gradient(ellipse at top, #1e3a5f 0%, transparent 55%),
    var(--bg);
}
.auth-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px 22px;
  box-shadow: 0 20px 50px rgba(0,0,0,.35);
}
.logo { text-align: center; margin-bottom: 20px; }
.logo-icon { font-size: 2.4rem; }
.logo h1 { margin: 8px 0 4px; font-size: 1.75rem; letter-spacing: -0.02em; }
.tagline { margin: 0; color: var(--muted); font-size: 0.95rem; }
.tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 18px; }
.tab {
  padding: 10px;
  border-radius: 12px;
  background: var(--bg);
  color: var(--muted);
  border: 1px solid transparent;
}
.tab.active { color: var(--text); border-color: var(--border); background: var(--bg-elevated); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 600;
  transition: transform .08s ease, background .15s ease;
}
.btn:active { transform: scale(0.98); }
.btn.primary { background: var(--primary); color: white; }
.btn.primary:active { background: var(--primary-press); }
.btn.secondary { background: var(--bg-elevated); border: 1px solid var(--border); }
.btn.ghost { color: var(--muted); }
.btn.danger { background: rgba(239,68,68,.15); color: #fca5a5; }
.btn.sm { padding: 8px 12px; font-size: 0.85rem; border-radius: 10px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.error {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(239,68,68,.12);
  color: #fca5a5;
  font-size: 0.9rem;
}

/* Shell */
#view-main {
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + var(--safe-bottom));
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(11, 18, 32, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar strong { display: block; }
.topbar-left { min-width: 0; flex: 1; }
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.content { padding: 16px; max-width: 640px; margin: 0 auto; }

/* Always-visible Plans control in header */
.plan-chip {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  padding: 6px 12px;
  border-radius: 12px;
  border: 1px solid rgba(251, 191, 36, 0.45);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.22), rgba(59, 130, 246, 0.18));
  color: var(--text);
  line-height: 1.15;
  min-width: 72px;
}
.plan-chip:active { transform: scale(0.97); }
.plan-chip-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fcd34d;
}
.plan-chip-value {
  font-size: 0.88rem;
  font-weight: 800;
}
.plan-chip.is-paid {
  border-color: rgba(34, 197, 94, 0.45);
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.18), rgba(59, 130, 246, 0.15));
}
.plan-chip.is-paid .plan-chip-label { color: #86efac; }
.plan-chip.is-free {
  animation: plan-pulse 2.4s ease-in-out infinite;
}
@keyframes plan-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.25); }
  50% { box-shadow: 0 0 0 4px rgba(251, 191, 36, 0.12); }
}

/* Home plan banner */
.plan-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  text-align: left;
  margin: 0 0 14px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(251, 191, 36, 0.4);
  background:
    linear-gradient(120deg, rgba(245, 158, 11, 0.16), rgba(59, 130, 246, 0.14));
  color: var(--text);
}
.plan-cta:active { transform: scale(0.99); }
.plan-cta-paid {
  border-color: rgba(34, 197, 94, 0.35);
  background: linear-gradient(120deg, rgba(34, 197, 94, 0.12), rgba(59, 130, 246, 0.1));
}
.plan-cta-kicker {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #fcd34d;
  margin-bottom: 2px;
}
.plan-cta-paid .plan-cta-kicker { color: #86efac; }
.plan-cta-main strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 2px;
}
.plan-cta-sub {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
}
.plan-cta-action {
  flex-shrink: 0;
  font-weight: 800;
  font-size: 0.9rem;
  color: #93c5fd;
  white-space: nowrap;
}

.bottom-nav {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: calc(var(--nav-h) + var(--safe-bottom));
  padding: 8px 8px var(--safe-bottom);
  display: grid;
  grid-template-columns: 1fr 1.15fr 1fr 1fr;
  gap: 4px;
  background: rgba(18, 26, 43, 0.96);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--muted);
  font-size: 0.72rem;
  border-radius: 14px;
}
.nav-btn .nav-icon { font-size: 1.25rem; }
.nav-btn.active { color: var(--text); background: rgba(59,130,246,.12); }
.nav-btn.identify {
  background: linear-gradient(180deg, #3b82f6, #2563eb);
  color: white;
  box-shadow: 0 8px 20px rgba(37,99,235,.35);
  transform: translateY(-10px);
  height: 64px;
  border-radius: 20px;
}
.nav-btn.identify.active { outline: 2px solid rgba(255,255,255,.35); }
.nav-btn.plans {
  color: #fcd34d;
}
.nav-btn.plans.active {
  color: #fde68a;
  background: rgba(245, 158, 11, 0.16);
}

/* Cards / lists */
.page-title {
  margin: 0 0 4px;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}
.page-sub { margin: 0 0 16px; color: var(--muted); font-size: 0.9rem; }

.key-list { display: flex; flex-direction: column; gap: 10px; }
.key-card {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  text-align: left;
  width: 100%;
}
.key-card:active { background: var(--bg-elevated); }
.key-thumb {
  width: 72px;
  height: 72px;
  border-radius: 12px;
  object-fit: cover;
  background: var(--bg);
  border: 1px solid var(--border);
}
.key-thumb.placeholder {
  display: grid;
  place-items: center;
  font-size: 1.6rem;
  color: var(--muted);
}
.key-card h3 { margin: 0 0 4px; font-size: 1.05rem; }
.key-card p { margin: 0; font-size: 0.85rem; color: var(--muted); }
.chevron { color: var(--muted); font-size: 1.2rem; }

.empty {
  text-align: center;
  padding: 40px 16px;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}
.empty .emoji { font-size: 2.5rem; display: block; margin-bottom: 8px; }

/* Forms / camera */
.stack { display: flex; flex-direction: column; gap: 12px; }
.camera-box {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  background: #000;
  aspect-ratio: 3/4;
  border: 1px solid var(--border);
}
.camera-box video,
.camera-box img.preview {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.camera-guide {
  position: absolute;
  inset: 12% 18%;
  border: 2px dashed rgba(255,255,255,.45);
  border-radius: 12px;
  pointer-events: none;
}
.camera-guide.key-outline {
  inset: 18% 6%;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.12);
  border-radius: 16px;
}
.camera-guide .key-guide {
  width: 92%;
  height: auto;
  max-height: 70%;
  filter: drop-shadow(0 0 4px rgba(0,0,0,.6));
}

.stepper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 14px;
}
.stepper .step {
  text-align: center;
  font-size: 0.72rem;
  padding: 8px 4px;
  border-radius: 10px;
  background: var(--bg);
  color: var(--muted);
  border: 1px solid var(--border);
}
.stepper .step.active {
  color: var(--text);
  border-color: var(--primary);
  background: rgba(59,130,246,.15);
  font-weight: 600;
}
.stepper .step.done {
  color: #86efac;
  border-color: rgba(34,197,94,.35);
}

.step-banner {
  margin-bottom: 10px;
}
.step-banner strong { font-size: 1.05rem; }
.step-banner p { margin: 4px 0 0; }

.capture-thumbs {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.cap-thumb {
  width: 72px;
  height: 72px;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
  background: var(--bg);
}
.cap-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cap-thumb span {
  position: absolute;
  left: 4px;
  bottom: 2px;
  font-size: 0.7rem;
  background: rgba(0,0,0,.55);
  padding: 1px 5px;
  border-radius: 6px;
}
.cap-thumb.empty {
  display: grid;
  place-items: center;
  color: var(--muted);
  border-style: dashed;
}

.quality-msg {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 0.88rem;
  line-height: 1.4;
}
.quality-msg.good {
  background: rgba(34,197,94,.12);
  border: 1px solid rgba(34,197,94,.3);
  color: #bbf7d0;
}
.quality-msg.bad {
  background: rgba(245,158,11,.12);
  border: 1px solid rgba(245,158,11,.35);
  color: #fde68a;
}
.quality-msg ul { margin: 6px 0 0; padding-left: 18px; }

.shoot-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 14px;
}
.shoot-card-title {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
}
.shoot-diagram {
  background: #0b1220;
  border-radius: 12px;
  padding: 12px 8px;
  border: 1px solid var(--border);
}
.shoot-diagram .key-guide {
  width: 100%;
  height: auto;
  display: block;
}
.camera-hint {
  position: absolute;
  left: 0; right: 0; bottom: 10px;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,.85);
  text-shadow: 0 1px 3px rgba(0,0,0,.8);
  padding: 0 12px;
}
.row { display: flex; gap: 8px; }
.row .btn { flex: 1; }

.result-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.result-card.winner { border-color: rgba(34,197,94,.45); box-shadow: 0 0 0 1px rgba(34,197,94,.15); }
.confidence {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(59,130,246,.15);
  color: #93c5fd;
}
.confidence.high { background: rgba(34,197,94,.15); color: #86efac; }
.confidence.low { background: rgba(245,158,11,.15); color: #fcd34d; }
.ai-summary {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: rgba(59,130,246,.08);
  border: 1px solid rgba(59,130,246,.2);
  font-size: 0.95rem;
  line-height: 1.45;
}
.detail-grid {
  display: grid;
  gap: 10px;
  margin: 14px 0;
}
.detail-item {
  background: var(--bg);
  border-radius: 12px;
  padding: 10px 12px;
}
.detail-item .label { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.detail-item .value { margin-top: 2px; font-size: 1rem; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--nav-h) + 16px + var(--safe-bottom));
  transform: translateX(-50%);
  background: #1e293b;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 12px;
  z-index: 50;
  max-width: min(90vw, 360px);
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
  font-size: 0.9rem;
}

.spinner {
  width: 22px; height: 22px;
  border: 2px solid rgba(255,255,255,.25);
  border-top-color: white;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.photo-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.photo-strip img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border);
  flex: 0 0 auto;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.9rem;
  margin: 4px 0 8px;
}
.checkbox-row input { width: auto; }

.tips {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.88rem;
  color: #fde68a;
  line-height: 1.45;
  margin-bottom: 14px;
}
.tips strong { color: #fcd34d; }
.tips ol { margin: 8px 0 0; padding-left: 18px; }
.tips li { margin-bottom: 4px; }

/* Photo capture guide */
.photo-guide {
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.28);
  border-radius: 14px;
  padding: 0 14px 12px;
  margin-bottom: 14px;
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.45;
}
.photo-guide > summary {
  cursor: pointer;
  list-style: none;
  padding: 12px 0 8px;
  color: #93c5fd;
  user-select: none;
}
.photo-guide > summary::-webkit-details-marker { display: none; }
.photo-guide-lead {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.86rem;
}
.do-dont {
  display: grid;
  gap: 10px;
}
@media (min-width: 520px) {
  .do-dont { grid-template-columns: 1fr 1fr; }
}
.do-box, .dont-box {
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 0.84rem;
}
.do-box {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.28);
}
.dont-box {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
}
.do-label { color: #4ade80; display: block; margin-bottom: 6px; }
.dont-label { color: #f87171; display: block; margin-bottom: 6px; }
.do-box ul, .dont-box ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text);
}
.do-box li, .dont-box li { margin-bottom: 5px; }
.shoot-card {
  margin-top: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}
.shoot-card-title {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 6px;
  text-align: center;
}
.shoot-diagram { width: 100%; }
.shoot-diagram .key-guide { width: 100%; height: auto; display: block; }

.score-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--bg);
  overflow: hidden;
  margin-top: 6px;
}
.score-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #22c55e);
  border-radius: 999px;
}
.score-bar.low > span { background: linear-gradient(90deg, #f59e0b, #ef4444); }

.lab-stat {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 12px 0;
}
.lab-stat .detail-item { margin: 0; }

.threshold-slider {
  width: 100%;
  accent-color: var(--primary);
}
.pair-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.pair-row .same { color: #86efac; }
.pair-row .diff { color: #fca5a5; }