/* ── Design Tokens ──────────────────────────────────────────────── */

:root {
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --color-bg: #2a1a0a;
  --color-accent: #c8883a;
  --color-accent-dim: rgba(200, 136, 58, 0.15);
  --color-accent-hover: rgba(200, 136, 58, 0.22);
  --color-text: #f7e8d0;
  --color-text-muted: #a08060;
  --color-card-bg: rgba(10, 4, 0, 0.92);
  --color-card-glow: rgba(200, 136, 58, 0.08);
  --radius: 20px;
  --radius-sm: 10px;
  --blur: 28px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --speed: 280ms;
}

/* ── Reset ──────────────────────────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100%;
  width: 100%;
  background: var(--color-bg);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Background ─────────────────────────────────────────────────── */

.bg {
  position: fixed;
  inset: 0;
}

.bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 63.5% 67.4%;
}

@media (orientation: portrait) {
  .bg img {
    object-position: 50% 67.4%;
  }
}

/* ── Card Shell ─────────────────────────────────────────────────── */

#card-wrap {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 2rem);
  max-width: 560px;
  overflow: hidden;
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-glow);
  border-top: 1px solid rgba(200, 136, 58, 0.15);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem 1.2rem;
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.55),
    0 16px 56px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(1.4);
  backdrop-filter: blur(var(--blur)) saturate(1.4);
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.6s ease-out;
}

#card-wrap.ready {
  visibility: visible;
  opacity: 1;
}

/* ── Handle (mobile visual cue) ─────────────────────────────────── */

.card-handle {
  display: none;
  width: 36px;
  height: 4px;
  background: rgba(200, 168, 122, 0.18);
  border-radius: 2px;
  margin: 0 auto 1rem;
}

/* ── Brand ──────────────────────────────────────────────────────── */

.card-brand {
  margin: 0 0 1rem;
  font-family: var(--font);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(200, 136, 58, 0.3);
  text-align: center;
}

/* ── Card Viewport ──────────────────────────────────────────────── */

.card-viewport {
  position: relative;
  transition: opacity 160ms ease;
}

#card-detail {
  display: none;
}

#card-wrap.show-detail #card-fact {
  display: none;
}

#card-wrap.show-detail #card-detail {
  display: block;
}

/* ── Fact View ──────────────────────────────────────────────────── */

.card-category {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
}

.card-body {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.72;
  color: var(--color-text);
  overflow-wrap: break-word;
  word-break: break-word;
}

#card-more {
  display: none;
  background: none;
  border: none;
  padding: 0.3rem 0;
  margin: 0;
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  opacity: 0.6;
  cursor: pointer;
  transition: opacity 150ms ease;
  -webkit-tap-highlight-color: transparent;
}

#card-more.visible {
  display: inline-block;
}

#card-more:hover {
  opacity: 1;
}

#card-more:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ── Detail View ────────────────────────────────────────────────── */

.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: none;
  padding: 0.25rem 0;
  margin-bottom: 0.8rem;
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-accent);
  opacity: 0.65;
  cursor: pointer;
  transition: opacity 150ms ease;
  -webkit-tap-highlight-color: transparent;
}

.detail-back:hover {
  opacity: 1;
}

.detail-back:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 3px;
}

.detail-back svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.detail-title {
  margin: 0 0 0.9rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.35;
}

.detail-info {
  margin: 0 0 0.9rem;
}

.detail-info dt {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.1rem;
}

.detail-info dd {
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--color-text);
  margin: 0 0 0.65rem;
}

.detail-note {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-text-muted);
  margin: 0 0 1rem;
  overflow-wrap: break-word;
  word-break: break-word;
}

.detail-links {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.detail-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  background: var(--color-accent-dim);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  transition: background 150ms ease;
}

.detail-link:hover {
  background: var(--color-accent-hover);
}

.detail-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.detail-link svg {
  width: 14px;
  height: 14px;
  stroke: var(--color-accent);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.6;
  flex-shrink: 0;
  margin-left: 0.5rem;
}

/* ── Card content fade for nav transitions ──────────────────────── */

#card-fact {
  transition: opacity 200ms ease, transform 200ms ease;
}

/* ── Navigation ─────────────────────────────────────────────────── */

.card-nav {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 1rem;
}

.card-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--color-accent-dim);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  cursor: pointer;
  transition: background 150ms ease;
  -webkit-tap-highlight-color: transparent;
}

.card-btn:hover {
  background: var(--color-accent-hover);
}

.card-btn:active {
  background: rgba(200, 136, 58, 0.3);
}

.card-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.card-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card-counter {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(200, 168, 122, 0.3);
}

.card-progress {
  flex: 1;
  min-width: 0;
  height: 2px;
  background: rgba(200, 136, 58, 0.1);
  border-radius: 1px;
  overflow: hidden;
}

#card-progress-fill {
  height: 100%;
  background: var(--color-accent);
  opacity: 0.5;
  border-radius: 1px;
  transition: width 350ms ease;
}

/* ── Hint ───────────────────────────────────────────────────────── */

.card-hint {
  margin: 0.6rem 0 0;
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(200, 168, 122, 0.15);
  text-align: center;
}

@media (pointer: coarse) {
  .card-hint { display: none; }
}

/* ── Responsive: Landscape mobile ───────────────────────────────── */

@media (orientation: landscape) and (max-height: 500px) {
  #card-wrap {
    bottom: 0.6rem;
    padding: 0.8rem 1.2rem 0.7rem;
  }
  .card-brand { margin-bottom: 0.6rem; }
  .card-body {
    font-size: 0.92rem;
    line-height: 1.55;
    margin-bottom: 0.3rem;
  }
  .card-nav { margin-top: 0.6rem; }
}

/* ── Responsive: Mobile bottom sheet ────────────────────────────── */

@media (max-width: 520px) {
  #card-wrap {
    bottom: 0;
    left: 0;
    right: 0;
    width: auto;
    max-width: none;
    transform: none;
    border-radius: 18px 18px 0 0;
    border-bottom: none;
    border-top: 1px solid rgba(200, 136, 58, 0.18);
    padding: 0.5rem 1.25rem 0.75rem;
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
    box-shadow:
      0 -2px 20px rgba(0, 0, 0, 0.5),
      0 -8px 40px rgba(0, 0, 0, 0.35),
      inset 0 1px 0 rgba(255, 255, 255, 0.04);
  }

  .card-handle {
    display: block;
  }

  .card-brand {
    margin-bottom: 0.7rem;
    font-size: 0.6rem;
  }

  .card-body {
    font-size: 1rem;
    line-height: 1.65;
  }

  .card-nav {
    margin-top: 0.8rem;
  }
}

/* ── Reduced Motion ─────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
  }
}