/* =========================================================
   MyFashionAge — Shared Stylesheet
   Fashion-magazine inspired: serif headlines + clean body
   ========================================================= */

:root {
  --color-bg: #faf8f5;
  --color-surface: #ffffff;
  --color-surface-2: #f5f3ee;
  --color-ink: #1a1a2e;
  --color-ink-soft: #4a4a5e;
  --color-ink-muted: #8a8a9b;
  --color-line: #e8e4dc;
  --color-line-strong: #d8d2c4;

  --color-brand: #1a1a2e;
  --color-accent: #e94560;
  --color-accent-soft: #fce4e8;
  --color-gold: #c9a961;

  --shadow-sm: 0 1px 2px rgba(26, 26, 46, 0.04), 0 1px 3px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 4px 16px rgba(26, 26, 46, 0.06), 0 2px 4px rgba(26, 26, 46, 0.04);
  --shadow-lg: 0 12px 32px rgba(26, 26, 46, 0.08), 0 4px 8px rgba(26, 26, 46, 0.04);
  --shadow-xl: 0 24px 48px rgba(26, 26, 46, 0.12), 0 8px 16px rgba(26, 26, 46, 0.06);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --font-serif: 'Playfair Display', 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --container: 1100px;
  --container-narrow: 760px;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-ink);
  margin: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--color-brand); text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.2rem, 4vw, 3.4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.05rem; }

p { color: var(--color-ink-soft); margin: 0 0 1em; }

/* ---------- Navigation ---------- */
nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-line);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-wrap: wrap;
  text-align: center;
  color: var(--color-ink);
}
nav img {
  height: 28px;
  border-radius: 6px;
  background: transparent;
  box-shadow: none;
  margin-right: 8px;
  vertical-align: middle;
  display: inline-block;
}
nav a {
  color: var(--color-ink-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  transition: color 0.2s ease, background 0.2s ease;
  margin: 0;
}
nav a:hover {
  color: var(--color-ink);
  background: var(--color-surface-2);
}
nav a.active {
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

/* ---------- Layout ---------- */
main {
  max-width: var(--container);
  margin: 48px auto;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 48px 40px 64px;
}
main.narrow { max-width: var(--container-narrow); }

/* ---------- Hero (index.html) ---------- */
.hero {
  text-align: center;
  padding: 16px 0 32px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 32px;
}
.hero .eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}
.hero h1 { margin-bottom: 16px; }
.hero p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--color-ink-soft);
  font-size: 1.1rem;
}

/* ---------- Buttons ---------- */
.btn,
.file-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--color-ink);
  color: #fff;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-pill);
  padding: 12px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  text-decoration: none;
  margin-top: 12px;
  line-height: 1.2;
}
.btn:hover,
.file-label:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn:active,
.file-label:active { transform: translateY(0); }
.btn:disabled,
.file-label:disabled,
.btn[disabled] {
  background: var(--color-line);
  border-color: var(--color-line);
  color: var(--color-ink-muted);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line-strong);
}
.btn-secondary:hover {
  background: var(--color-ink);
  color: #fff;
  border-color: var(--color-ink);
}
.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-ink);
  border-color: var(--color-ink);
}
.file-input { display: none; }

/* ---------- Input section (Webcam / Upload picker) ---------- */
.input-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0 0;
}
.input-method {
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.input-method:hover {
  border-color: var(--color-ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.input-method h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  margin-bottom: 4px;
  color: var(--color-ink);
}
.input-method p {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  margin-bottom: 8px;
}

/* ---------- Webcam layout ---------- */
.webcam-layout {
  display: none;
  flex-direction: row;
  gap: 28px;
  justify-content: center;
  align-items: flex-start;
  margin-top: 32px;
}
.webcam-preview-col {
  flex: 1;
  min-width: 320px;
  max-width: 520px;
  text-align: center;
}
.webcam-analyst-col {
  flex: 1;
  min-width: 280px;
  max-width: 400px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
}
.webcam-analyst-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-ink);
  font-weight: 700;
  margin-bottom: 16px;
}
.webcam-analyst-result {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
}
.webcam-analyst-confidence {
  font-size: 1rem;
  color: var(--color-ink-soft);
  margin-bottom: 6px;
}
.webcam-analyst-second {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  margin-bottom: 12px;
}

.buttons {
  display: flex;
  flex-direction: row;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Preview & result sections ---------- */
.preview-section,
.result-section,
.final-result-section {
  margin-top: 32px;
  text-align: center;
}
.preview-section img,
.final-image-preview img,
.final-image-preview canvas {
  max-width: 320px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-line);
  margin: 0 auto 16px;
}
.preview-section h3,
.result-section h3 {
  font-family: var(--font-serif);
  margin-bottom: 12px;
}

.final-result-section { display: none; }
.final-result-container {
  width: 100%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 36px 24px;
}
.final-age-result {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-accent);
  margin: 18px 0 8px;
  letter-spacing: -0.01em;
}
.final-confidence-score {
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  margin-bottom: 8px;
}
.final-confidence-bar {
  width: 100%;
  height: 8px;
  background: var(--color-line);
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
  overflow: hidden;
}
.final-confidence-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  border-radius: var(--radius-pill);
  transition: width 0.6s ease;
}
.final-second-place {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  margin-bottom: 12px;
}
.final-action-buttons { margin-top: 18px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ---------- Status & loading ---------- */
.model-status {
  margin-bottom: 16px;
  padding: 12px 16px;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  border-radius: var(--radius-sm);
  color: #065f46;
  font-size: 0.92rem;
}
.error-message,
#error {
  margin-bottom: 16px;
  padding: 12px 16px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
}
.loading-box {
  text-align: center;
  margin: 24px 0;
  padding: 28px 20px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-line);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-box p { margin: 0; color: var(--color-ink); font-weight: 500; }

/* ---------- Era section ---------- */
.fashion-eras-section {
  margin-top: 64px;
  padding: 56px 0 16px;
  border-top: 1px solid var(--color-line);
}
.fashion-eras-section .section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}
.fashion-eras-section .section-head .eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}
.fashion-eras-section h2 {
  margin-bottom: 12px;
}
.fashion-eras-section .section-head p {
  font-size: 1.05rem;
  color: var(--color-ink-soft);
}

.era-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.era-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.era-card .era-decade {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
}
.era-card h3 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  margin: 4px 0 12px;
  color: var(--color-ink);
}
.era-card .era-desc {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--color-ink-soft);
  margin-bottom: 24px;
  max-width: 760px;
}
.era-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 8px;
}
.era-grid img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  object-position: bottom;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.era-grid img:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

/* ---------- "How it works" steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
  text-align: center;
  margin: 36px 0;
}
.step .step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-ink);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 auto 16px;
}
.step h4 { color: var(--color-ink); margin-bottom: 6px; font-size: 1.1rem; }
.step p { color: var(--color-ink-soft); font-size: 0.95rem; }

/* ---------- Divider ---------- */
.divider {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin: 40px 0;
}

/* ---------- CTA ---------- */
.cta-block {
  text-align: center;
  padding: 32px 0 8px;
}
.cta-block p {
  font-size: 1.15rem;
  color: var(--color-ink);
  margin-bottom: 18px;
  font-weight: 500;
}

/* ---------- Keywords (small text) ---------- */
.keywords {
  text-align: center;
  margin: 32px 0;
  color: var(--color-ink-muted);
  font-size: 0.85rem;
  line-height: 1.7;
}

/* ---------- FAQ ---------- */
details {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  background: var(--color-surface);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
details[open] {
  border-color: var(--color-line-strong);
  box-shadow: var(--shadow-sm);
}
summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 1.02rem;
  color: var(--color-ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-ink-muted);
  font-weight: 400;
  transition: transform 0.2s ease;
}
details[open] summary::after { content: '–'; }
details p {
  margin-top: 12px;
  color: var(--color-ink-soft);
  font-size: 0.98rem;
}

/* ---------- Contact box ---------- */
.contact-box {
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-top: 24px;
}
.contact-box a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- Footer ---------- */
footer {
  background: transparent;
  color: var(--color-ink-muted);
  text-align: center;
  padding: 32px 20px 24px;
  font-size: 0.9rem;
  margin-top: 40px;
  border-top: 1px solid var(--color-line);
}
footer a { color: var(--color-ink-soft); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Share modal ---------- */
#share-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 46, 0.55);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}
.share-modal-card {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 360px;
  width: calc(100% - 32px);
  margin: auto;
  padding: 36px 24px 28px;
  box-shadow: var(--shadow-xl);
  text-align: center;
  position: relative;
}
.share-modal-card h3 {
  margin-bottom: 8px;
  color: var(--color-ink);
}
.share-modal-card p {
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  margin-bottom: 20px;
}
#share-modal-close {
  position: absolute;
  right: 14px;
  top: 12px;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--color-ink-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
}
#share-modal-close:hover { color: var(--color-ink); }
.share-buttons { display: flex; flex-direction: column; gap: 10px; }
.share-buttons .file-label { margin-top: 0; }
.share-buttons .share-x { background: #000; border-color: #000; }
.share-buttons .share-x:hover { background: var(--color-accent); border-color: var(--color-accent); }
.share-buttons .share-fb { background: #1877f3; border-color: #1877f3; }
.share-buttons .share-fb:hover { background: var(--color-accent); border-color: var(--color-accent); }
.share-buttons .share-ig { background: #e1306c; border-color: #e1306c; }
.share-buttons .share-ig:hover { background: var(--color-accent); border-color: var(--color-accent); }
.share-buttons .share-dl { background: var(--color-ink); border-color: var(--color-ink); }
.share-buttons .share-dl:hover { background: var(--color-accent); border-color: var(--color-accent); }

/* ---------- Result page (full bleed) ---------- */
body.result-page {
  background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1e 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.result-container {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 40px;
  text-align: center;
  max-width: 560px;
  width: calc(100% - 32px);
  position: relative;
  overflow: hidden;
}
.result-container::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold), var(--color-brand));
}
.result-container .header h1 {
  font-family: var(--font-serif);
  margin: 0 0 12px;
  font-size: 1.8rem;
  color: var(--color-ink);
}
.fashion-age-display {
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  color: var(--color-ink);
  padding: 32px 24px;
  border-radius: var(--radius-md);
  margin: 24px 0;
}
.age-result {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  margin: 8px 0;
  color: var(--color-accent);
  letter-spacing: -0.01em;
}
.confidence-score {
  font-size: 1rem;
  color: var(--color-ink-soft);
  margin: 8px 0;
}
.second-place {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-top: 12px;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
}
.confidence-bar {
  background: var(--color-line);
  height: 8px;
  border-radius: var(--radius-pill);
  margin: 14px 0;
  overflow: hidden;
}
.confidence-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  border-radius: var(--radius-pill);
  transition: width 0.6s ease;
}
.action-buttons {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.image-preview {
  margin: 20px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-line);
}
.image-preview img { width: 100%; max-width: 320px; margin: 0 auto; height: auto; }
.loading-animation { display: none; margin: 20px 0; }
.language-selector {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  gap: 6px;
}
.lang-btn {
  padding: 6px 12px;
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  font-weight: 600;
  font-size: 12px;
}
.lang-btn.active {
  background: var(--color-ink);
  color: #fff;
  border-color: var(--color-ink);
}
.lang-btn:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ---------- Demo (how.html) ---------- */
.demo-grid {
  margin: 32px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}
.demo-grid video {
  width: 100%;
  border-radius: var(--radius-md);
  background: #000;
  box-shadow: var(--shadow-md);
}
.demo-panel {
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.demo-panel-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-ink);
  font-weight: 700;
  margin-bottom: 16px;
}
.demo-panel-age {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .webcam-layout { flex-direction: column; gap: 20px; }
  .webcam-preview-col, .webcam-analyst-col { max-width: 100%; width: 100%; min-width: 0; }
  .demo-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  main { padding: 28px 20px 40px; margin: 20px 12px; border-radius: var(--radius-md); }
  .input-section { grid-template-columns: 1fr; gap: 14px; }
  .era-card { padding: 22px; }
  .era-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
  .era-grid img { height: 200px; }
  nav { padding: 10px 12px; gap: 0; }
  nav a { padding: 6px 10px; font-size: 13px; }
  nav img { height: 24px; }
}