/* ============================================
   成云杉YSC 个人作品网站 - 全局样式
   yscai101.com
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  /* 背景色 */
  --bg-primary: #0a0a0f;
  --bg-secondary: #111827;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);

  /* 文字色 */
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* 强调色 */
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-purple: #8b5cf6;
  --accent-pink: #a855f7;
  --gradient-accent: linear-gradient(135deg, #6366f1, #a855f7);

  /* 边框 */
  --border-color: rgba(255, 255, 255, 0.1);
  --border-color-hover: rgba(255, 255, 255, 0.2);
  --glow-color: rgba(99, 102, 241, 0.4);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 字体 */
  --font-sans: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* 间距 */
  --section-padding: 100px 0;
  --container-width: 1200px;
  --nav-height: 72px;

  /* 动画 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--accent-light);
}

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
}

/* ---------- 页面加载动画 ---------- */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-content {
  text-align: center;
}

.loader-logo {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: loaderPulse 1.5s ease-in-out infinite;
}

.loader-bar {
  width: 120px;
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  margin: 20px auto 0;
  overflow: hidden;
}

.loader-bar::after {
  content: '';
  display: block;
  width: 40%;
  height: 100%;
  background: var(--gradient-accent);
  border-radius: 2px;
  animation: loaderSlide 1s ease-in-out infinite;
}

@keyframes loaderPulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

@keyframes loaderSlide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border-color);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transition: width var(--transition-normal);
}

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

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

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 6px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ---------- 移动端导航菜单 ---------- */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 24px;
  border-bottom: 1px solid var(--border-color);
  z-index: 999;
  transform: translateY(-10px);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.mobile-menu a {
  display: block;
  padding: 14px 0;
  font-size: 1.1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  transition: color var(--transition-fast), padding-left var(--transition-normal);
}

.mobile-menu a:last-child {
  border-bottom: none;
}

.mobile-menu a:hover {
  color: var(--text-primary);
  padding-left: 8px;
}

/* ---------- Hero 区域 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

/* 背景渐变效果 */
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse 600px 600px at 30% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 500px 500px at 70% 60%, rgba(168, 85, 247, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 400px 400px at 50% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
  animation: heroBgFloat 20s ease-in-out infinite;
  z-index: 0;
}

@keyframes heroBgFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(2deg); }
  66% { transform: translate(-20px, 20px) rotate(-1deg); }
}

/* 网格背景 */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 70%);
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  50% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  animation: fadeInUp 0.8s ease 0.1s forwards;
  opacity: 0;
}

.hero-title .gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 12px;
  letter-spacing: 0.1em;
  animation: fadeInUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.hero-subtitle span {
  color: var(--accent-light);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease 0.3s forwards;
  opacity: 0;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s forwards;
  opacity: 0;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.btn-icon {
  font-size: 1.1em;
  transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
  transform: translateX(4px);
}

/* ---------- Section 通用 ---------- */
.section {
  padding: var(--section-padding);
  position: relative;
}

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

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-light);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---------- 分割线装饰 ---------- */
.section-divider {
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin: 0 auto 16px;
}

/* ---------- 作品筛选标签 ---------- */
.filter-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.filter-tag {
  padding: 8px 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.filter-tag:hover,
.filter-tag.active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

/* ---------- 作品卡片网格 ---------- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.work-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
}

.work-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.work-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 30px var(--glow-color);
}

.work-card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  overflow: hidden;
  position: relative;
}

.work-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 60%, rgba(10, 10, 15, 0.8));
}

.work-card-body {
  padding: 20px;
}

.work-card-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.work-card-tag {
  font-size: 0.7rem;
  padding: 3px 10px;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-light);
  border-radius: 100px;
  font-weight: 500;
}

.work-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.work-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.work-card-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.work-card-link {
  color: var(--accent-light);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast);
}

.work-card:hover .work-card-link {
  gap: 8px;
}

/* ---------- 查看更多按钮区 ---------- */
.section-more {
  text-align: center;
  margin-top: 48px;
}

/* ---------- 关于我页面 ---------- */
.about-hero {
  padding: 160px 0 80px;
  text-align: center;
}

.about-avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--gradient-accent);
  margin: 0 auto 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  font-weight: 700;
  color: #fff;
  position: relative;
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
}

.about-avatar::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
}

.about-name {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.about-tagline {
  color: var(--accent-light);
  font-size: 1.1rem;
  margin-bottom: 24px;
}

.about-bio {
  max-width: 680px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 统计数据 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin: 60px 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  transition: all var(--transition-normal);
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* 技能标签云 */
.skills-section {
  padding: 80px 0;
}

.skills-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
}

.skill-tag {
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  cursor: default;
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(99, 102, 241, 0.1);
  transform: translateY(-2px);
}

.skill-tag.highlight {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(99, 102, 241, 0.1);
}

/* 时间线 */
.timeline-section {
  padding: 80px 0;
}

.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-purple), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.timeline-item:hover {
  border-color: var(--border-color-hover);
  transform: translateX(4px);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 30px;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 10px var(--glow-color);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--accent-light);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.timeline-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 60px 0 40px;
  background: linear-gradient(to bottom, var(--bg-primary), rgba(17, 24, 39, 0.5));
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  transition: all var(--transition-normal);
}

.social-link:hover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
  transform: translateY(-2px);
  color: var(--accent-light);
}

.footer-nav h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-nav a {
  display: block;
  padding: 6px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition-fast), padding-left var(--transition-normal);
}

.footer-nav a:hover {
  color: var(--text-primary);
  padding-left: 4px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- 返回顶部按钮 ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1.2rem;
  color: var(--text-secondary);
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  transform: translateY(-2px);
}

/* ---------- 滚动动画 ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ---------- 页面专用：作品页 ---------- */
.page-header {
  padding: 140px 0 60px;
  text-align: center;
  background: linear-gradient(to bottom, var(--bg-primary), var(--bg-secondary));
}

.works-page-grid {
  padding: 0 0 80px;
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
    --nav-height: 64px;
  }

  /* 导航 */
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  /* Hero */
  .hero {
    padding: 100px 20px 60px;
    min-height: auto;
    min-height: 100svh;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  /* 作品网格 */
  .works-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 统计 */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  /* 时间线 */
  .timeline {
    padding-left: 32px;
  }

  .timeline::before {
    left: 11px;
  }

  .timeline-item::before {
    left: -29px;
    width: 10px;
    height: 10px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  /* 返回顶部 */
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 0.9rem;
  }

  .filter-tags {
    gap: 8px;
  }

  .filter-tag {
    padding: 6px 14px;
    font-size: 0.8rem;
  }

  .about-avatar {
    width: 110px;
    height: 110px;
    font-size: 2.5rem;
  }

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

/* ---------- 选择文字高亮 ---------- */
::selection {
  background: rgba(99, 102, 241, 0.3);
  color: #fff;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}