/* ============================================
   个人主页 - 典雅主题 (Elegant & Classic)
   ============================================ */

/* CSS Variables */
:root {
  /* Colors - Magazine Luxe */
  --bg: #f3f1ec;
  --bg-card: #fffcf8;
  --text: #1f1d1a;
  --text-muted: #6d655c;
  --border: #e1d9cd;
  --border-light: #efe9df;
  --primary: #6e5843;
  --primary-hover: #4f3f30;

  /* Fonts - 衬线体与无衬线体的优雅结合 */
  --font-heading: 'Playfair Display', 'Noto Serif SC', serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;

  /* Space & Sizes */
  --space: 2.5rem;
  --space-lg: 6rem;
  --space-xl: 8rem;
  --max-width: 1240px;
  
  /* Radius - 极小的圆角，更显硬朗和复古纸张感 */
  --radius: 4px;
  --radius-sm: 0px;
  
  /* Shadows - 极度柔和的弥散阴影 */
  --shadow-sm: 0 8px 28px rgba(28, 23, 18, 0.06);
  --shadow: 0 26px 80px rgba(28, 23, 18, 0.12);
  
  --transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
  color: var(--text);
  background: radial-gradient(circle at top, #faf7f2 0%, #eee7dc 60%, #e7e0d5 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 统一的标题字体 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--text);
}

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

ul {
  list-style: none;
}

/* ============================================
   Animations & Reveal
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 1s ease-out, transform 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }

/* ============================================
   Common Layout
   ============================================ */
.page-wrapper {
  max-width: var(--max-width);
  margin: 1.4rem auto 3rem;
  background: var(--bg-card);
  box-shadow: var(--shadow); 
  min-height: 100vh;
  position: relative;
  z-index: 1;
  border: 1px solid var(--border);
  overflow: hidden;
}

.container {
  width: 100%;
  margin: 0 auto;
}

.section-header {
  margin-bottom: 4.5rem;
  text-align: center;
  position: relative;
}

/* 典雅的标题下方装饰线 */
.section-header::after {
  content: '';
  display: block;
  width: 56px;
  height: 1px;
  background: var(--primary);
  margin: 1.2rem auto 0;
}

.section-title {
  font-size: clamp(2rem, 2.6vw, 2.8rem);
  margin-bottom: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
  font-family: var(--font-heading);
  font-style: italic;
  letter-spacing: 0.02em;
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: rgba(255, 252, 248, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: transform 0.4s ease;
}

.navbar-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.48rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  letter-spacing: 0.16em;
  font-weight: 500;
  text-transform: uppercase;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-icon {
  width: 18px;
  height: 18px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: calc(var(--space-lg) + 92px) var(--space) calc(var(--space-lg) * 0.85);
  position: relative;
  overflow: hidden;
}

.hero-bg-blob {
  position: absolute;
  width: min(72vw, 900px);
  height: min(72vw, 900px);
  background: radial-gradient(circle, rgba(110, 88, 67, 0.12) 0%, rgba(110, 88, 67, 0.04) 38%, rgba(110, 88, 67, 0) 72%);
  top: -42%;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.hero-content {
  width: 100%;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-content::before {
  content: 'Portfolio';
  display: block;
  margin-bottom: 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-title {
  font-size: clamp(5.2rem, 12vw, 8.8rem);
  line-height: 0.93;
  color: var(--text);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-shadow: 0 2px 0 rgba(255, 255, 255, 0.65);
  position: relative;
  padding: 0 0.15em;
}

.hero-title::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -1.2rem;
  width: clamp(120px, 20vw, 220px);
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--primary) 22%, var(--primary) 78%, transparent 100%);
}

/* ============================================
   Projects Section
   ============================================ */
.projects {
  padding: calc(var(--space-lg) * 1) 0;
  background: transparent;
  border-top: none;
}

.projects .container {
  padding: 0 var(--space);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.8rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: #fffefb;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem 1.2rem 1.7rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.project-card:hover {
  border-color: #cdbca8;
  box-shadow: var(--shadow);
  transform: translateY(-5px);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #b79c80 0%, #7e654e 100%);
  opacity: 0.65;
}

.project-image-placeholder,
.project-image {
  aspect-ratio: 16 / 10;
  background: var(--bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  overflow: hidden;
  position: relative;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease, filter 0.8s ease;
  filter: contrast(0.98) saturate(0.92) sepia(0.04);
}

.project-card:hover .project-image img {
  transform: scale(1.03);
  filter: contrast(1) sepia(0);
}

.project-info {
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-title {
  font-size: 1.18rem;
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 0.8rem;
  letter-spacing: 0.08em;
}

.project-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.82;
}

.project-links {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--primary);
}

.project-link svg {
  width: 16px;
  height: 16px;
  stroke-width: 1.5;
}

/* ============================================
   Travel Section
   ============================================ */
.travel {
  padding: calc(var(--space-xl) * 0.78) 0 var(--space-xl);
  background: transparent;
  border-top: none;
}

.travel .container {
  padding: 0 var(--space);
}

.travel-timeline {
  display: flex;
  gap: 2.25rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
  scrollbar-width: none;
  padding-top: 2rem;
}

.travel-timeline::-webkit-scrollbar {
  display: none;
}

.travel-timeline.active-scroll {
  opacity: 1;
  pointer-events: auto;
}

.travel-timeline.is-dragging {
  scroll-snap-type: none;
  cursor: grabbing;
}

.travel-card {
  flex: 0 0 360px;
  scroll-snap-align: center;
  cursor: grab;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  user-select: none;
  -webkit-user-drag: none; /* 修复移动端滑动时可能被误认为拖拽图片的bug */
}

.travel-timeline.is-dragging .travel-card {
  cursor: grabbing;
}

.travel-date {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-style: italic;
  color: var(--primary);
  margin-bottom: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.travel-node-wrapper {
  position: relative;
  height: 24px;
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
}

/* 典雅的节点圆环设计 */
.travel-node {
  width: 10px;
  height: 10px;
  background: var(--bg-card);
  border: 1.5px solid var(--primary);
  border-radius: 50%;
  z-index: 2;
  transition: var(--transition);
}

.travel-card:hover .travel-node {
  background: var(--primary);
  transform: scale(1.4);
}

.travel-line {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: calc(100% + 2rem);
  height: 1px;
  background: var(--border);
  z-index: 1;
}

.travel-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.2rem;
  position: relative;
}

.travel-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease, filter 0.8s ease;
  filter: grayscale(0.15) sepia(0.1);
  pointer-events: none; /* 移动端禁止图片原生拖拽触发 */
}

.travel-card:hover .travel-image img {
  transform: scale(1.05);
  filter: grayscale(0) sepia(0);
}

.travel-info {
  margin-top: 0.5rem;
}

.travel-location {
  font-family: var(--font-heading);
  font-size: 1.14rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@media (min-width: 1200px) {
  .projects-grid {
    gap: 2rem;
  }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  :root {
    --space: 1.5rem; /* 缩小基础内边距 */
    --space-lg: 4rem; /* 缩小大间距 */
    --space-xl: 5rem; /* 缩小超大间距 */
  }

  .navbar {
    height: 60px; /* 缩小导航栏高度 */
  }

  .nav-links {
    gap: 1rem;
  }
  
  .nav-links a {
    font-size: 0.85rem; /* 缩小导航栏字体 */
  }

  .nav-logo {
    font-size: 1.3rem;
  }

  .hero {
    padding: calc(var(--space-lg) + 60px) var(--space) var(--space-lg);
    min-height: 100vh;
    min-height: 100svh;
  }

  .hero-title {
    font-size: clamp(2.8rem, 10vw, 4rem); /* 调整标题缩放比例 */
  }

  .section-title {
    font-size: 1.8rem;
  }

  .section-subtitle {
    font-size: 0.95rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .project-card {
    transform: none !important;
  }

  .hero-content::before {
    letter-spacing: 0.24em;
  }

  .hero-title {
    letter-spacing: 0.12em;
  }
  
  .page-wrapper {
    border-left: none;
    border-right: none;
    box-shadow: none; /* 移动端移除外层阴影，显得更平*/
  }
}

@media (max-width: 480px) {
  :root {
    --space: 1.25rem; /* 进一步缩小手机端内边距 */
  }

  .nav-links {
    gap: 0.8rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .travel-card {
    flex: 0 0 85vw; /* 让卡片宽度适应屏幕比例，而不是固定像素 */
  }
}