/* ========================================================================
   DeskByAI — Base Styles
   Typography: Geist (discouraged default Inter swapped per taste-skill)
   ======================================================================== */

:root {
  --bg: #faf9f8;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --text-subtle: #9c9c9c;
  --border: #e8e6e4;
  --accent: #1a1a1a;
  --accent-hover: #333;
  --tag-bg: #f0eeec;
  --radius: 8px;
  --max-w: 1200px;
  --font: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Geist Mono", "SF Mono", "Fira Code", monospace;
  --card-shadow: 0 2px 12px rgba(26,26,26,0.04);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

/* Dark mode — added per taste-skill Section 4.11 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --surface: #1c1c1c;
    --text: #e8e8e8;
    --text-muted: #9c9c9c;
    --text-subtle: #6b6b6b;
    --border: #2a2a2a;
    --accent: #e8e8e8;
    --accent-hover: #ffffff;
    --tag-bg: #2a2a2a;
    --card-shadow: 0 2px 12px rgba(0,0,0,0.3);
  }
}

/* Reduced motion — per taste-skill pre-flight check */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.75; }

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Header / Nav
   ============================================ */

header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo span { color: var(--text-muted); font-weight: 400; }

nav a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

nav a:hover { color: var(--text); }

/* ============================================
   Hero
   ============================================ */

.hero {
  padding: 64px 0 48px;
  text-align: center;
  position: relative;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  max-width: 640px;
  margin: 0 auto 12px;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.0625rem;
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ============================================
   Filter Bar
   ============================================ */

.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-start;
  margin: 32px 0 40px;
}

.filter-btn {
  padding: 7px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  font-family: var(--font);
  user-select: none;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}

.filter-btn:active {
  transform: translateY(0px);
}

.filter-btn.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

/* ============================================
   Scheme Grid
   ============================================ */

.scheme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  padding-bottom: 64px;
}

.scheme-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform 0.3s cubic-bezier(0.2,0,0,1), box-shadow 0.3s cubic-bezier(0.2,0,0,1), border-color 0.3s ease;
  cursor: pointer;
  border: 1px solid var(--border);
}

.scheme-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.07);
  border-color: color-mix(in srgb, var(--border) 80%, var(--accent));
}

.scheme-card .card-image {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--tag-bg);
  position: relative;
}

.scheme-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.2,0,0,1);
}

.scheme-card:hover .card-image img {
  transform: scale(1.05);
}

.scheme-card .card-body {
  padding: 16px 20px 20px;
}

.scheme-card .card-tags {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.scheme-card .tag {
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--tag-bg);
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: background 0.2s;
}

.scheme-card:hover .tag {
  background: color-mix(in srgb, var(--tag-bg) 90%, var(--accent));
}

.scheme-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.scheme-card .card-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 12px;
  line-height: 1.5;
}

.scheme-card .price-tag {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

/* ============================================
   Footer
   ============================================ */

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
  line-height: 1.6;
}

/* ============================================
   Scheme Detail Page
   ============================================ */

.scheme-hero {
  width: 100%;
  max-height: 65vh;
  overflow: hidden;
  border-radius: var(--radius);
  margin: 32px 0;
  background: var(--tag-bg);
  position: relative;
}

.scheme-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.04);
  pointer-events: none;
}

.scheme-hero img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: opacity 0.4s;
}

.scheme-header {
  margin-bottom: 28px;
}

.scheme-header .breadcrumb {
  font-size: 0.8125rem;
  color: var(--text-subtle);
  margin-bottom: 12px;
}

.scheme-header .breadcrumb a:hover { text-decoration: underline; }

.scheme-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.scheme-header .meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.scheme-header .total-price {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.scheme-header .tags {
  display: flex;
  gap: 6px;
}

.scheme-desc {
  max-width: 700px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 44px;
  font-size: 0.9375rem;
}

.scheme-desc p + p {
  margin-top: 16px;
}

/* Product List */
.product-list { margin-bottom: 56px; }

.product-list h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.product-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 12px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s, border-color 0.2s;
  border-radius: 6px;
  margin: 0 -4px;
}

.product-item:hover {
  background: var(--tag-bg);
}

.product-item:last-child { border-bottom: none; }

.product-item .p-image {
  width: 72px;
  height: 72px;
  border-radius: 8px;
  background: var(--tag-bg);
  flex-shrink: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.product-item:hover .p-image {
  border-color: color-mix(in srgb, var(--border) 70%, var(--accent));
}

.product-item .p-info { flex: 1; }

.product-item .p-name {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 2px;
  letter-spacing: -0.01em;
}

.product-item .p-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.product-item .p-price {
  font-size: 0.9375rem;
  font-weight: 600;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.product-item .p-btn {
  padding: 8px 18px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background 0.2s, transform 0.2s;
  white-space: nowrap;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  text-decoration: none;
  user-select: none;
}

.product-item .p-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.02);
}

.product-item .p-btn:active {
  transform: scale(0.98);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.75rem; max-width: 100%; }
  .hero p { font-size: 1rem; }
  .scheme-grid { grid-template-columns: 1fr; }
  .filter-bar {
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }
  .filter-bar::-webkit-scrollbar { display: none; }
  .filter-btn { flex-shrink: 0; font-size: 0.75rem; padding: 6px 14px; }
  .product-item { flex-wrap: wrap; padding: 14px 8px; margin: 0 -4px; }
  .product-item .p-btn { width: 100%; text-align: center; }
  .scheme-header h1 { font-size: 1.5rem; }
  .scheme-hero { max-height: 45vh; }
}