/* ========================================
   1. Design Tokens
   ======================================== */
:root {
  --font-serif: 'Noto Serif SC', 'Playfair Display', Georgia, serif;
  --font-display: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;

  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #757575;
  --color-accent: #c41e3a;
  --color-brand: #9370FB;
  --color-border: #e8e8e8;
  --color-rule: #d4d4d4;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --max-width: 1200px;
  --grid-gap: 1.5rem;
  --card-radius: 4px;
  --transition: 0.2s ease;
}

/* ========================================
   2. Reset / Base
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ========================================
   3. Typography
   ======================================== */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.25;
}

/* ========================================
   4. Masthead
   ======================================== */
.masthead {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

.masthead__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.masthead__subtitle {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--color-muted);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-top: var(--spacing-xs);
}

.masthead__rule {
  width: 40px;
  height: 2px;
  background: var(--color-brand);
  margin: 0 auto;
}

.masthead__rule:first-of-type {
  margin-bottom: var(--spacing-md);
}

.masthead__rule:last-of-type {
  margin-top: var(--spacing-md);
}

/* ========================================
   5. Navigation
   ======================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.nav__pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.pill[data-category="平台简介"] { background: #f4f0ff; color: #6741d9; }
.pill[data-category="商家案例"] { background: #edf2ff; color: #3b5bdb; }
.pill[data-category="热点同款"] { background: #fff4e6; color: #e67700; }

.pill:hover {
  filter: brightness(0.95);
}

.pill.active {
  background: var(--color-brand);
  color: #ffffff;
}

/* Search */
.nav__search {
  position: relative;
  flex-shrink: 0;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  pointer-events: none;
}

.search-input {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.45rem 0.75rem 0.45rem 2.25rem;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  width: 200px;
  transition: border-color var(--transition), width var(--transition);
}

.search-input:focus {
  border-color: var(--color-brand);
  width: 240px;
}

/* ========================================
   6. Home Sections (Three-category layout)
   ======================================== */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

.section + .section {
  padding-top: 0;
}

.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-text);
}

.section__title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-text);
}

.section__more {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  transition: color var(--transition);
  cursor: pointer;
  border: none;
  background: none;
}

.section__more:hover {
  color: var(--color-brand);
}

/* Category intro text */
.category-intro {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  line-height: 1.85;
  color: #4a4a4a;
  max-width: 900px;
  margin-top: var(--spacing-sm);
}

/* Sub-category pills (detail page) */
.sub-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: var(--spacing-sm);
}

.sub-pill {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.sub-pill:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

.sub-pill.active {
  background: var(--color-text);
  color: #ffffff;
  border-color: var(--color-text);
}

/* Third-level sub-sub-category pills */
.sub-sub-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.4rem;
}

.sub-sub-pill {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 400;
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  border: 1px solid #ece5dc;
  background: transparent;
  color: #a09888;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.sub-sub-pill:hover {
  border-color: #a09888;
  color: #6b6358;
}

.sub-sub-pill.active {
  background: #8b7355;
  color: #ffffff;
  border-color: #8b7355;
}

/* Original title (secondary title on cards) */
.card__original-title {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  font-weight: 400;
  font-style: italic;
  color: #999;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: -0.15rem;
}

/* Sub-category section divider */
.sub-section {
  margin-bottom: var(--spacing-md);
}

.sub-section__heading {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  padding: 0 var(--spacing-md) 0.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.sub-section__heading span {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--color-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sub-section__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
  padding: 0 var(--spacing-md);
}

/* Smaller cards in sub-sections */
.sub-section__grid .card__image-wrap {
  aspect-ratio: 16 / 9;
}

.sub-section__grid .card__title {
  font-size: 0.9rem;
}

.sub-section__grid .card__summary {
  font-size: 0.78rem;
}

.sub-section__grid .card__date {
  font-size: 0.7rem;
}

.sub-section__grid .card__body {
  padding: 0.75rem;
}

/* ========================================
   Special Module Card (transition page)
   ======================================== */
.module-card {
  background: #faf7f5;
  border: 1px solid #e8e0d8;
  border-radius: var(--card-radius);
  padding: var(--spacing-sm);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  cursor: default;
}

.module-card__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #b8860b;
}

.module-card__intro {
  font-size: 0.78rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.module-card__links {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 0.25rem;
}

.module-card__link {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.82rem;
  color: var(--color-text);
  padding: 0.4rem 0;
  border-bottom: 1px dotted #e8e0d8;
  transition: color var(--transition);
}

.module-card__link:last-child {
  border-bottom: none;
}

.module-card__link:hover {
  color: var(--color-brand);
}

/* ========================================
   Detail Split Layout (红人商家 full page)
   ======================================== */
.detail-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md) var(--spacing-lg);
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.detail-main {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
}

/* Sidebar module */
.sidebar-module {
  background: #faf7f5;
  border: 1px solid #e8e0d8;
  border-radius: var(--card-radius);
  padding: var(--spacing-md);
  position: sticky;
  top: 80px;
}

.sidebar-module__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #b8860b;
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid #e8e0d8;
}

.sidebar-module__intro {
  font-size: 0.82rem;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.sidebar-module__links {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar-link {
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid #ece5dc;
  transition: padding var(--transition);
}

.sidebar-link:last-child {
  border-bottom: none;
}

.sidebar-link:hover {
  padding-left: 0.4rem;
}

.sidebar-link__title {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sidebar-link__date {
  display: block;
  font-size: 0.68rem;
  color: var(--color-muted);
  margin-top: 0.2rem;
}

/* ========================================
   Responsive overrides for split layout
   ======================================== */
@media (max-width: 900px) {
  .detail-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .detail-main {
    grid-template-columns: repeat(2, 1fr);
  }

  .sidebar-module {
    position: static;
  }
}

@media (max-width: 600px) {
  .detail-main {
    grid-template-columns: 1fr;
  }
}

.section__row {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--spacing-lg);
}

.section__row--reverse {
  grid-template-columns: 2fr 3fr;
}

.section__row--reverse .section__image-wrap {
  order: 2;
}

.section__row--reverse .section__articles {
  order: 1;
}

.section__image-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--card-radius);
  height: 100%;
}

.section__image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.section__image-wrap:hover .section__image {
  transform: scale(1.03);
}

.section__articles {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.article-link {
  display: block;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding var(--transition);
}

.article-link:hover {
  padding-left: 0.5rem;
}

.article-link__title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link__summary {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-top: 0.2rem;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link__date {
  display: block;
  font-size: 0.72rem;
  color: var(--color-muted);
  margin-top: 0.35rem;
  letter-spacing: 0.03em;
}

/* ========================================
   7. Card Component
   ======================================== */
.card {
  background: var(--color-surface);
  border-radius: var(--card-radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

.card__image-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #f0f0f0;
}

.card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card__image {
  transform: scale(1.03);
}

.card__image--placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #e8e8e8 0%, #f5f5f5 50%, #e0e0e0 100%);
}

.card__tag {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.7rem;
  border-radius: 2px;
  background: rgba(255,255,255,0.9);
  color: var(--color-text);
  backdrop-filter: blur(4px);
}

.card__body {
  padding: var(--spacing-sm);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.card__title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__summary {
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__date {
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.03em;
  margin-top: auto;
}

/* ---- Subcategory capsules ---- */
.card__capsules {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.card__capsule {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 500;
  font-family: var(--font-sans);
  background: #f4f0ff;
  color: #6741d9;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
  position: relative;
  z-index: 2;
}

.card__capsule:hover {
  background: #e2d9ff;
  transform: scale(1.05);
}

/* Text-only card (no image) */
.card--text-only {
  background: #fafaf9;
  border-top: 3px solid var(--color-brand);
}

.card--text-only .card__body {
  padding: var(--spacing-md);
}

.card--text-only .card__title {
  font-size: 1.12rem;
}

.card--text-only .card__tag--inline {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-brand);
  margin-bottom: 0.4rem;
}

/* Series collection card */
.card--series {
  background: #fefefe;
  border: 1px solid #e4ded6;
  flex-direction: column;
  gap: 0;
}

.card--series .card__body {
  padding: 1.25rem;
  gap: 0.5rem;
}

.card--series .card__series-label {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #c4b59a;
}

.card--series .card__title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

.card--series .card__series-links {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid #ede7de;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
}

.card--series .card__series-link {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--color-text);
  padding: 0.65rem 0;
  border-bottom: 1px solid #f2ede5;
  transition: padding 0.25s ease, color 0.25s ease;
}

.card--series .card__series-link:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.card--series .card__series-link:hover {
  padding-left: 0.6rem;
  color: #8b7355;
}

.card--series .card__series-count {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  color: #bbb;
  letter-spacing: 0.04em;
  margin-top: 0.25rem;
}

/* ========================================
   8. Category Grid (detail view)
   ======================================== */
.grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.card--large {
  grid-column: span 2;
}

/* ========================================
   9. No Results
   ======================================== */
.no-results {
  display: none;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  color: var(--color-muted);
}

.no-results.visible {
  display: block;
}

.no-results__icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.no-results__text {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xs);
}

.no-results__hint {
  font-size: 0.9rem;
}

/* ========================================
   10. Footer
   ======================================== */
.footer {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  color: var(--color-muted);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.footer__rule {
  width: 40px;
  height: 1px;
  background: var(--color-rule);
  margin: 0 auto var(--spacing-md);
}

/* ========================================
   11. Responsive
   ======================================== */
@media (max-width: 900px) {
  .section__row {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }

  .section__row--reverse {
    grid-template-columns: 1fr 1fr;
  }

  .article-link__title {
    font-size: 0.85rem;
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .card--large {
    grid-column: span 1;
  }
}

@media (max-width: 600px) {
  .masthead {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .nav__inner {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }

  .nav__pills {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
  }

  .nav__pills::-webkit-scrollbar {
    display: none;
  }

  .nav__search {
    width: 100%;
  }

  .search-input,
  .search-input:focus {
    width: 100%;
  }

  .section {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .section + .section {
    padding-top: 0;
  }

  .section__title {
    font-size: 1.3rem;
  }

  .section__row,
  .section__row--reverse {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .section__image-wrap {
    height: auto;
    aspect-ratio: 3 / 2;
  }

  .grid {
    grid-template-columns: 1fr;
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .card__image-wrap {
    aspect-ratio: 16 / 9;
  }

  .sub-section__grid {
    grid-template-columns: 1fr;
    padding: 0 var(--spacing-sm);
  }
}