/* ==========================================================================
   闲云墨香手记 - Modern Zen & Editorial CSS Design System
   ========================================================================== */

:root {
  /* Color Palette - Light (Warm Rice Paper / Tea Sage / Ink) */
  --bg-primary: #FAF7F2;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-alt: #F3EFE6;
  --bg-hover: #F7F3EA;
  --border-color: #EAE3D5;
  --border-light: #F0EBE0;
  
  --text-primary: #2C2621;
  --text-secondary: #5C544B;
  --text-muted: #8C8276;
  
  --brand-seal: #8B3A2B; /* Vermilion cinnabar seal */
  --accent-tea: #3E5E4E;  /* Bamboo / Tea leaf green */
  --accent-tea-light: #EBF2ED;
  --accent-ochre: #A86532; /* Warm clay ochre */
  --accent-ochre-light: #FBF0E6;
  --accent-ink: #2F3E46;  /* Deep river ink */
  --accent-ink-light: #EDF2F4;
  
  --shadow-sm: 0 2px 8px rgba(44, 38, 33, 0.04);
  --shadow-md: 0 8px 24px rgba(44, 38, 33, 0.06);
  --shadow-lg: 0 16px 40px rgba(44, 38, 33, 0.08);
  
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", "STSong", "STKaiti", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg-primary: #181716;
  --bg-surface: #22201D;
  --bg-card: #22201D;
  --bg-alt: #2B2824;
  --bg-hover: #322E2A;
  --border-color: #38342D;
  --border-light: #2E2B25;
  
  --text-primary: #EAE5DC;
  --text-secondary: #B5ADA1;
  --text-muted: #7E766B;
  
  --brand-seal: #C45543;
  --accent-tea: #689D82;
  --accent-tea-light: #213329;
  --accent-ochre: #D98C4E;
  --accent-ochre-light: #3D2919;
  --accent-ink: #6C828D;
  --accent-ink-light: #242E33;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.4);
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Container */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Reading Progress Bar */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-seal), var(--accent-tea));
  width: 0%;
  z-index: 1000;
  transition: width 0.1s ease-out;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

[data-theme="dark"] .site-header {
  background: rgba(24, 23, 22, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-seal svg {
  width: 38px;
  height: 38px;
  display: block;
  transition: transform 0.3s ease;
}

.brand-link:hover .brand-seal svg {
  transform: rotate(5deg) scale(1.05);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.938rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 6px 4px;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--brand-seal);
  transition: width 0.25s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: rotate(15deg);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

[data-theme="light"] .moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(235, 242, 237, 0.6) 0%, transparent 70%);
}

[data-theme="dark"] .hero-section {
  background: radial-gradient(circle at 50% 20%, rgba(46, 62, 53, 0.25) 0%, transparent 70%);
}

.hero-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  background-color: var(--bg-alt);
  border: 1px solid var(--border-color);
  font-size: 0.813rem;
  color: var(--brand-seal);
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.hero-poem-sub {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  letter-spacing: 0.02em;
}

.hero-intro-card {
  max-width: 780px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 40px;
  box-shadow: var(--shadow-sm);
  position: relative;
  text-align: left;
}

.intro-quote-mark {
  position: absolute;
  top: 10px;
  left: 20px;
  font-family: var(--font-serif);
  font-size: 4rem;
  color: var(--border-color);
  line-height: 1;
  user-select: none;
  pointer-events: none;
}

.intro-text {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
  margin-bottom: 20px;
}

.intro-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-color);
  padding-top: 16px;
  flex-wrap: wrap;
}

.intro-meta .dot {
  color: var(--border-color);
}

/* Sections Common Header */
.section-header {
  margin-bottom: 40px;
}

.section-header.text-center {
  text-align: center;
}

.section-tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--brand-seal);
  display: block;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.03em;
  margin-bottom: 12px;
}

.title-decor-line {
  width: 48px;
  height: 3px;
  background-color: var(--brand-seal);
  margin-bottom: 14px;
}

.title-decor-line.center {
  margin-left: auto;
  margin-right: auto;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.filter-btn.active {
  background: var(--text-primary);
  color: var(--bg-surface);
  border-color: var(--text-primary);
}

/* Essays Grid */
.essays-section {
  padding: 60px 0 80px;
}

.essays-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.essay-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.essay-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-muted);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.category-pill {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.category-pill.nature {
  background: var(--accent-tea-light);
  color: var(--accent-tea);
}

.category-pill.reading {
  background: var(--accent-ochre-light);
  color: var(--accent-ochre);
}

.category-pill.life {
  background: var(--accent-ink-light);
  color: var(--accent-ink);
}

.essay-date {
  font-size: 0.813rem;
  color: var(--text-muted);
}

.essay-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.essay-excerpt {
  font-size: 0.938rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  flex-grow: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.read-time {
  font-size: 0.813rem;
  color: var(--text-muted);
}

.btn-read-more {
  background: none;
  border: none;
  color: var(--brand-seal);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: transform 0.2s ease, color 0.2s ease;
}

.btn-read-more:hover {
  transform: translateX(4px);
  color: var(--text-primary);
}

/* Quotes Section */
.quotes-section {
  padding: 70px 0;
  background-color: var(--bg-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.quotes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.quote-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: var(--transition);
}

.quote-card.featured-quote {
  border-left: 4px solid var(--brand-seal);
}

.quote-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.quote-symbol {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  color: var(--brand-seal);
  line-height: 1;
  margin-bottom: 12px;
}

.quote-body {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-primary);
  margin-bottom: 20px;
  flex-grow: 1;
}

.quote-source {
  font-size: 0.813rem;
  color: var(--text-muted);
  text-align: right;
  border-top: 1px dashed var(--border-color);
  padding-top: 12px;
}

/* Gallery / Moments Section */
.gallery-section {
  padding: 80px 0;
}

.moments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.moment-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.moment-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.moment-visual {
  height: 160px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 16px;
  background-size: cover;
  background-position: center;
}

.visual-tea {
  background: linear-gradient(135deg, #4A6B5D 0%, #2A4036 100%);
}

.visual-ink {
  background: linear-gradient(135deg, #3A4750 0%, #1F2529 100%);
}

.visual-mountain {
  background: linear-gradient(135deg, #8B5E3C 0%, #543822 100%);
}

.visual-snow {
  background: linear-gradient(135deg, #6C7A89 0%, #3F4750 100%);
}

.visual-badge {
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(4px);
  color: #FFFFFF;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.moment-caption {
  padding: 20px;
}

.moment-caption h4 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.moment-caption p {
  font-size: 0.813rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* About / Compliance Statement Section */
.about-section {
  padding: 0 0 80px;
}

.about-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.about-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.about-seal {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-tea-light);
  color: var(--accent-tea);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-seal svg {
  width: 26px;
  height: 26px;
}

.about-titles h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.about-titles p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.about-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.about-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.item-icon {
  font-size: 1.4rem;
  line-height: 1.4;
}

.item-text strong {
  display: block;
  font-size: 0.938rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.item-text p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Footer & MIIT Centered ICP Requirements */
.site-footer {
  background-color: var(--bg-alt);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 36px;
  text-align: center;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.footer-brand-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.footer-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-sep {
  color: var(--border-color);
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-copyright {
  font-size: 0.813rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Strictly Centered ICP Link (工信部要求必须首页下方中间位置放置) */
.icp-box {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 16px;
  border-top: 1px dashed var(--border-color);
}

.icp-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.938rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 20px;
  border-radius: 20px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.icp-link:hover {
  color: var(--brand-seal);
  border-color: var(--brand-seal);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.icp-icon {
  width: 16px;
  height: 16px;
  color: var(--brand-seal);
}

.icp-number {
  letter-spacing: 0.05em;
}

/* Modal Reader */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(18, 16, 14, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-width: 720px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 40px;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-dialog {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s ease;
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.modal-category {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--accent-tea-light);
  color: var(--accent-tea);
  font-weight: 600;
  display: inline-block;
  margin-bottom: 12px;
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 8px;
}

.modal-meta {
  font-size: 0.813rem;
  color: var(--text-muted);
}

.modal-text {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--text-secondary);
}

.modal-text p {
  margin-bottom: 18px;
  text-indent: 2em;
}

.modal-footer {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px dashed var(--border-color);
  text-align: center;
}

.btn-close-modal {
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 28px;
  border-radius: 20px;
  font-size: 0.938rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-close-modal:hover {
  background: var(--text-primary);
  color: var(--bg-surface);
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }
  .nav-menu {
    display: none;
  }
  .hero-section {
    padding: 50px 0 40px;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-intro-card {
    padding: 24px;
  }
  .essays-grid {
    grid-template-columns: 1fr;
  }
  .modal-dialog {
    padding: 24px;
  }
}