/* ============================================
   汉文化宣传网站全局样式
   配色: 深红 (#8B1A1A) + 金色 (#C9A961) + 米白 (#FDF8F0)
   ============================================ */

/* === Reset & Base === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #8B2C2D;
  --color-primary-dark: #6B1F20;
  --color-gold: #D4AF37;
  --color-gold-light: #E8D5A3;
  --color-bg: #FDF8F0;
  --color-bg-alt: #F5EDE0;
  --color-text: #2C2C2C;
  --color-text-light: #666;
  --color-white: #FFFFFF;
  --color-warning: #D4380D;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", "宋体", serif;
  --font-sans: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&family=Noto+Sans+SC:wght@400;500;700&display=swap');

html {
  scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-primary);
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

/* === Navigation === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(107, 20, 20, 0.95);
  backdrop-filter: blur(10px);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-gold);
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 4px;
}

.nav-brand::before {
  content: "";
  width: 40px;
  height: 40px;
  background: var(--color-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-menu a {
  padding: 8px 16px;
  border-radius: 4px;
  color: var(--color-white);
  font-size: 15px;
  position: relative;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-gold);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 80%;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-gold);
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 10px;
  background: none;
  border: none;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-gold);
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero Section === */
.hero {
  margin-top: 70px;
  padding: 100px 20px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cpath d='M50 5 L95 50 L50 95 L5 50 Z' fill='none' stroke='%23C9A961' stroke-width='0.5' opacity='0.1'/%3E%3Cpath d='M50 15 L85 50 L50 85 L15 50 Z' fill='none' stroke='%23C9A961' stroke-width='0.5' opacity='0.1'/%3E%3C/svg%3E") repeat;
  background-size: 100px;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  color: var(--color-gold);
  margin-bottom: 20px;
  letter-spacing: 8px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--color-white);
  opacity: 0.9;
  margin-bottom: 30px;
}

.hero-divider {
  width: 120px;
  height: 3px;
  background: var(--color-gold);
  margin: 0 auto 30px;
}

/* === Section Styles === */
.section {
  padding: 80px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: clamp(28px, 4vw, 40px);
  color: var(--color-primary);
  margin-bottom: 15px;
  letter-spacing: 4px;
}

.section-title p {
  color: var(--color-text-light);
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

.section-divider {
  width: 80px;
  height: 3px;
  background: var(--color-gold);
  margin: 15px auto;
}

/* === Card Grid === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.card {
  background: var(--color-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  cursor: pointer;
}

.card-content {
  padding: 20px;
}

.card-content h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.card-content p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.8;
}

.card-tag {
  display: inline-block;
  background: var(--color-gold-light);
  color: var(--color-primary-dark);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  margin-top: 10px;
}

/* === Image Modal === */
.image-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  display: none;
  justify-content: center;
  align-items: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.image-modal.show {
  display: flex;
  opacity: 1;
}

.image-modal-content {
  max-width: 90%;
  max-height: 90vh;
  position: relative;
}

.image-modal img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 8px;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
}

.image-modal-caption {
  color: var(--color-white);
  text-align: center;
  padding: 20px 0 10px;
  font-family: var(--font-serif);
}

.image-modal-close {
  position: absolute;
  top: -50px;
  right: 0;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 40px;
  cursor: pointer;
  transition: var(--transition);
}

.image-modal-close:hover {
  color: var(--color-gold);
}

/* === Timeline === */
.timeline {
  position: relative;
  padding: 40px 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-gold);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding: 20px 40px 20px 0;
  width: 50%;
  position: relative;
}

.timeline-item:nth-child(even) {
  justify-content: flex-start;
  padding: 20px 0 20px 40px;
  margin-left: 50%;
}

.timeline-item::before {
  content: "";
  position: absolute;
  right: -10px;
  top: 30px;
  width: 20px;
  height: 20px;
  background: var(--color-gold);
  border-radius: 50%;
  border: 4px solid var(--color-bg);
  z-index: 1;
}

.timeline-item:nth-child(even)::before {
  right: auto;
  left: -10px;
}

.timeline-content {
  background: var(--color-white);
  padding: 25px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  max-width: 350px;
}

.timeline-content h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.timeline-date {
  color: var(--color-gold);
  font-weight: 600;
  margin-bottom: 10px;
  font-size: 14px;
}

.timeline-content p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.8;
}

/* === Waterfall Layout === */
.waterfall {
  column-count: 3;
  column-gap: 25px;
}

.waterfall-item {
  break-inside: avoid;
  margin-bottom: 25px;
  background: var(--color-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.waterfall-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.waterfall-item img {
  width: 100%;
  display: block;
  cursor: pointer;
}

.waterfall-item-content {
  padding: 20px;
}

.waterfall-item-content h3 {
  color: var(--color-primary);
  margin-bottom: 10px;
}

.waterfall-item-content p {
  color: var(--color-text-light);
  font-size: 14px;
}

/* === Person Card === */
.person-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.person-card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
  border-top: 4px solid var(--color-gold);
}

.person-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.person-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 20px;
  object-fit: cover;
  border: 4px solid var(--color-gold-light);
}

.person-name {
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 5px;
}

.person-era {
  color: var(--color-gold);
  font-size: 14px;
  margin-bottom: 15px;
}

.person-achievements {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 15px;
}

.person-tag {
  background: var(--color-bg-alt);
  color: var(--color-primary-dark);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
}

.person-quote {
  font-style: italic;
  color: var(--color-text-light);
  font-family: var(--font-serif);
  font-size: 14px;
  padding: 15px;
  background: var(--color-bg);
  border-radius: 8px;
  position: relative;
}

.person-quote::before {
  content: """;
  font-size: 48px;
  color: var(--color-gold);
  position: absolute;
  top: -5px;
  left: 10px;
  font-family: serif;
}

/* === Evolution Card (汉字演变) === */
.evolution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 30px;
}

.evolution-card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow);
}

.evolution-card h3 {
  text-align: center;
  font-size: 48px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.evolution-stages {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
}

.evolution-stage {
  text-align: center;
  flex: 1;
}

.evolution-stage .char {
  font-size: 40px;
  font-family: var(--font-serif);
  color: var(--color-primary);
  margin-bottom: 5px;
}

.evolution-stage .label {
  font-size: 12px;
  color: var(--color-gold);
}

.evolution-arrow {
  color: var(--color-gold);
  font-size: 20px;
}

/* === Writing Animation === */
.writing-animation {
  margin: 40px auto;
  text-align: center;
}

.writing-canvas {
  width: 300px;
  height: 300px;
  margin: 0 auto;
  position: relative;
  background: var(--color-white);
  border-radius: 16px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: center;
  align-items: center;
}

.writing-canvas svg {
  width: 250px;
  height: 250px;
}

.writing-canvas svg path {
  stroke: var(--color-primary);
  stroke-width: 8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: writeStroke 3s linear forwards;
}

@keyframes writeStroke {
  to {
    stroke-dashoffset: 0;
  }
}

.writing-controls {
  margin-top: 20px;
}

.btn {
  padding: 12px 24px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
  font-family: var(--font-sans);
  transition: var(--transition);
}

.btn:hover {
  background: var(--color-primary-dark);
  transform: scale(1.05);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-primary-dark);
}

.btn-gold:hover {
  background: #B8984F;
}

/* === Warning Banner === */
.warning-banner {
  background: linear-gradient(135deg, var(--color-warning) 0%, #A82C0C 100%);
  color: var(--color-white);
  padding: 20px;
  text-align: center;
  font-family: var(--font-serif);
}

.warning-banner h3 {
  color: var(--color-white);
  font-size: 20px;
  margin-bottom: 10px;
}

.warning-banner p {
  font-size: 14px;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto;
}

/* === History Section === */
.history-note {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-gold);
  padding: 20px 25px;
  margin: 20px 0;
  border-radius: 0 8px 8px 0;
}

.history-note p {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.8;
}

.history-note .source {
  color: var(--color-gold);
  font-style: italic;
  margin-top: 10px;
  font-size: 13px;
}

.reflection-section {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 60px 20px;
  margin-top: 60px;
}

.reflection-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.reflection-content h2 {
  color: var(--color-gold);
  font-size: 32px;
  margin-bottom: 30px;
}

.reflection-content p {
  font-size: 16px;
  line-height: 2;
  margin-bottom: 20px;
}

/* === Entry Cards (首页入口) === */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 25px;
}

.entry-card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 40px 25px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.entry-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-gold);
  transform: scaleX(0);
  transition: var(--transition);
}

.entry-card:hover::before {
  transform: scaleX(1);
}

.entry-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.entry-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: var(--color-bg-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
}

.entry-card h3 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.entry-card p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.6;
}

/* === Footer === */
.footer {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 60px 20px 30px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
}

.footer-section h3 {
  color: var(--color-gold);
  font-size: 18px;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.footer-section p,
.footer-section a {
  color: var(--color-white);
  opacity: 0.8;
  font-size: 14px;
  line-height: 2;
}

.footer-section a:hover {
  opacity: 1;
  color: var(--color-gold);
}

.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(201, 169, 97, 0.3);
  text-align: center;
  font-size: 13px;
  opacity: 0.7;
}

/* === Page Header (各页顶部) === */
.page-header {
  margin-top: 70px;
  padding: 60px 20px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  text-align: center;
}

.page-header h1 {
  color: var(--color-gold);
  font-size: clamp(28px, 5vw, 42px);
  margin-bottom: 15px;
  letter-spacing: 6px;
}

.page-header p {
  color: var(--color-white);
  opacity: 0.9;
  font-size: 16px;
}

/* === Sub Section === */
.sub-section {
  padding: 60px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.sub-title {
  font-size: 28px;
  color: var(--color-primary);
  margin-bottom: 40px;
  text-align: center;
  position: relative;
}

.sub-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-gold);
  margin: 15px auto 0;
}

/* === Responsive Design === */
@media (max-width: 992px) {
  .waterfall {
    column-count: 2;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    width: 100%;
    margin-left: 0;
    padding: 20px 0 20px 50px;
    justify-content: flex-start;
  }

  .timeline-item::before,
  .timeline-item:nth-child(even)::before {
    left: 10px;
    right: auto;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-primary-dark);
    flex-direction: column;
    padding: 20px;
    gap: 10px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 60px 20px;
  }

  .card-grid,
  .person-grid {
    grid-template-columns: 1fr;
  }

  .evolution-grid {
    grid-template-columns: 1fr;
  }

  .evolution-stages {
    flex-wrap: wrap;
    justify-content: center;
  }

  .waterfall {
    column-count: 1;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .person-card {
    padding: 25px;
  }

  .entry-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

@media (max-width: 480px) {
  .nav-brand {
    font-size: 18px;
    letter-spacing: 2px;
  }

  .nav-brand::before {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .section {
    padding: 50px 15px;
  }

  .entry-grid {
    grid-template-columns: 1fr;
  }
}