:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --ink: #10182b;
  --ink-soft: #4b5568;
  --border: #dfe4ee;
  --brand: #0f172a;
  --accent: #0ea5b7;
  --accent-ink: #075a63;
  --accent-soft: #e3f7f9;
  --warn: #92400e;
  --warn-bg: #fef3c7;
  --danger: #9f1c2e;
  --danger-bg: #fde8ea;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 43, 0.04), 0 10px 30px -12px rgba(16, 24, 43, 0.12);
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
  padding: 0;
  margin: -1px;
}

/* ---- Header ---- */
.site-header {
  background: var(--brand);
  color: #fff;
  padding: 22px 0;
}
.header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand-mark {
  font-size: 1.4rem;
}
.tagline {
  margin: 0;
  color: #a9b6d6;
  font-size: 0.95rem;
}

main {
  padding: 28px 20px 60px;
}

h1, h2, h3 {
  letter-spacing: -0.01em;
}
h2 {
  font-size: 1.25rem;
  margin: 0 0 12px;
}
h3 {
  font-size: 1.02rem;
  margin: 18px 0 6px;
}

/* ---- Privacy banner ---- */
.privacy-banner {
  background: linear-gradient(135deg, var(--accent-soft), #eef9fb);
  border: 1px solid #bfeaef;
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 24px;
}
.privacy-banner h2 {
  color: var(--accent-ink);
  font-size: 1.1rem;
}
.privacy-banner p {
  margin: 0 0 10px;
  color: #124e56;
}
.privacy-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 0.92rem;
  color: var(--accent-ink);
  font-weight: 600;
}

/* ---- Layout ---- */
.layout {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.2fr);
  gap: 20px;
  align-items: start;
}
@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 22px 26px;
  margin-bottom: 20px;
}

/* ---- Dropzone ---- */
.dropzone {
  border: 2px dashed #c3cbdc;
  border-radius: 12px;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: #fbfcfe;
  transition: border-color 0.15s ease, background 0.15s ease;
  outline-offset: 3px;
}
.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--accent);
  background: #f2fbfc;
}
.dropzone.drag {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dz-empty {
  text-align: center;
  color: var(--ink-soft);
  padding: 18px;
}
.dz-empty svg {
  color: var(--accent);
  margin-bottom: 6px;
}
.dz-empty .hint {
  font-size: 0.85rem;
}
.dz-preview {
  width: 100%;
  height: 100%;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
}
.dz-preview img {
  max-width: 100%;
  max-height: 320px;
  border-radius: 8px;
  object-fit: contain;
}

.field-error {
  color: var(--danger);
  font-size: 0.88rem;
  min-height: 1.2em;
  margin: 8px 0 0;
}

.field-row {
  margin-top: 18px;
}
.field-row label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.92rem;
}
.height-input-group {
  display: flex;
  align-items: center;
  gap: 8px;
}
.height-input-group input {
  width: 120px;
  padding: 10px 12px;
  border-radius: 9px;
  border: 1px solid var(--border);
  font-size: 1rem;
}
.height-input-group input:focus-visible {
  outline: 2px solid var(--accent);
}
.unit {
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.hint {
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin: 4px 0 0;
}

.consent-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.consent-row input {
  margin-top: 3px;
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 9px;
  padding: 11px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.12s ease, transform 0.05s ease;
}
.btn:active {
  transform: translateY(1px);
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  filter: brightness(1.05);
}
.btn-secondary {
  background: var(--brand);
  color: #fff;
}
.btn-ghost {
  background: #eef1f7;
  color: var(--ink);
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.samples {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
}
.samples label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.sample-row {
  display: flex;
  gap: 8px;
}
.sample-row select {
  flex: 1;
  padding: 9px 10px;
  border-radius: 9px;
  border: 1px solid var(--border);
}

.model-status {
  margin: 18px 0 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

/* ---- Results ---- */
.result-size {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.size-label {
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.size {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--brand);
  line-height: 1;
}
.adj {
  font-size: 0.8rem;
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 600;
}

.confidence {
  margin-top: 16px;
}
.confidence .lbl {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 5px;
}
.bar {
  height: 10px;
  border-radius: 999px;
  background: #e7ebf3;
  overflow: hidden;
}
.bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #f59e0b, var(--accent));
  border-radius: 999px;
  transition: width 0.3s ease;
}

.alert {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid #f4c2ca;
  padding: 12px 14px;
  border-radius: 10px;
  margin-top: 14px;
  font-size: 0.92rem;
}
.alert-warn {
  background: var(--warn-bg);
  color: var(--warn);
  border-color: #fcd989;
}

table.metrics {
  width: 100%;
  border-collapse: collapse;
  margin-top: 18px;
  font-size: 0.92rem;
}
table.metrics th,
table.metrics td {
  text-align: left;
  padding: 9px 8px;
  border-bottom: 1px solid var(--border);
}
table.metrics thead th {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
table.metrics td.val {
  font-weight: 700;
}
table.metrics td.range {
  color: var(--ink-soft);
}

.why {
  font-size: 0.92rem;
  color: #2b3550;
}
.why-line {
  margin: 0 0 8px;
}
.disclaimer {
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-style: italic;
  margin-top: 14px;
}

/* ---- Learning card ---- */
.learn-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 14px 0;
}
.learn-state {
  background: #f6f8fc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.9rem;
}

/* ---- About ---- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 6px;
}
.about-grid p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 4px 0 0;
}
.about-grid h3 {
  margin-top: 0;
  font-size: 0.95rem;
}

.site-footer {
  padding: 20px 0 40px;
  color: var(--ink-soft);
  font-size: 0.82rem;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}