/* ============================================
   zhaosp.com · 赵邵平个人门户
   科技蓝主题 · 深色/浅色模式
   ============================================ */

/* ---------- CSS Variables / Color System ---------- */
:root {
  /* 科技蓝主色系 */
  --primary: #1a6bff;
  --primary-dark: #0d4fbf;
  --primary-light: #4a8bff;
  --accent: #00d4ff;
  --accent-dark: #00a8cc;

  /* 浅色模式 */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7fa;
  --bg-card: #ffffff;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8a8ab0;
  --border: #e0e4ec;
  --shadow: rgba(0, 0, 0, 0.08);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --nav-bg: rgba(255, 255, 255, 0.95);
  --card-border: #e8ecf4;

  /* 渐变 */
  --gradient-hero: linear-gradient(135deg, #0a1628 0%, #1a2a4a 50%, #0d4fbf 100%);
  --gradient-card: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  /* 间距 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 50%;

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

/* ---------- Dark Mode ---------- */
[data-theme="dark"] {
  --bg-primary: #0a1628;
  --bg-secondary: #0f1f3a;
  --bg-card: #122244;
  --text-primary: #e8ecf4;
  --text-secondary: #a0b0d0;
  --text-muted: #607090;
  --border: #1e3050;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.5);
  --nav-bg: rgba(10, 22, 40, 0.95);
  --card-border: #1e3050;
  --gradient-hero: linear-gradient(135deg, #050e1a 0%, #0a1628 50%, #0a2a5a 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #0a1628;
    --bg-secondary: #0f1f3a;
    --bg-card: #122244;
    --text-primary: #e8ecf4;
    --text-secondary: #a0b0d0;
    --text-muted: #607090;
    --border: #1e3050;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
    --nav-bg: rgba(10, 22, 40, 0.95);
    --card-border: #1e3050;
    --gradient-hero: linear-gradient(135deg, #050e1a 0%, #0a1628 50%, #0a2a5a 100%);
  }
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--transition), color var(--transition);
}

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

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

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

ul { list-style: none; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-2xl);
  text-align: center;
  color: var(--text-primary);
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gradient-card);
  margin: var(--space-sm) auto 0;
  border-radius: 2px;
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.nav-logo span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

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

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

/* 深色模式切换按钮 */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

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

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

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

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  padding-top: 64px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(26, 107, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-avatar {
  margin-bottom: var(--space-lg);
}

.hero-avatar img {
  width: 140px;
  height: 180px;
  object-fit: cover;
  border: 3px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition), border-color var(--transition);
}

.hero-avatar img:hover {
  transform: scale(1.05);
  border-color: var(--accent);
}

.hero-name {
  font-size: 3.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: var(--space-md);
  letter-spacing: -1px;
}

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

.hero-title {
  font-size: 1.3rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-xl);
  font-weight: 400;
}

.hero-tags {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.hero-tag {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.85rem;
  transition: all var(--transition);
}

.hero-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.8rem;
  animation: bounce 2s infinite;
}

.scroll-indicator .arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid rgba(255, 255, 255, 0.4);
  border-bottom: 2px solid rgba(255, 255, 255, 0.4);
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ---------- Stats Cards ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition);
  box-shadow: 0 2px 8px var(--shadow);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-hover);
  border-color: var(--primary);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-card);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
  line-height: 1.4;
}

.stat-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* ---------- Skills ---------- */
.skills-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  max-width: 700px;
  margin: 0 auto;
}

.skill-tag {
  display: inline-block;
  padding: 8px 20px;
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition);
  cursor: default;
}

.skill-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(26, 107, 255, 0.15);
}

/* ---------- Featured Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition);
  box-shadow: 0 2px 8px var(--shadow);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-hover);
  border-color: var(--primary);
}

.project-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.project-card-role {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.project-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.project-card-tags span {
  padding: 3px 10px;
  background: rgba(26, 107, 255, 0.08);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--primary);
}

.project-card-link {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

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

/* ---------- Contact Section ---------- */
.contact-section {
  background: var(--bg-secondary);
  text-align: center;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.contact-item:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.contact-icon {
  font-size: 1.3rem;
}

.contact-text {
  font-size: 0.9rem;
  color: var(--text-primary);
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------- Page Header ---------- */
.page-header {
  padding: 120px 0 var(--space-3xl);
  background: var(--gradient-hero);
  text-align: center;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: #ffffff;
}

.page-subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--space-sm);
}

/* ---------- Timeline (Resume Page) ---------- */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-2xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--bg-primary);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

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

.timeline-meta {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
}

.timeline-org {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.timeline-details {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.timeline-details ul {
  list-style: disc;
  padding-left: var(--space-lg);
  margin-top: var(--space-sm);
}

.timeline-details li {
  margin-bottom: var(--space-sm);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.timeline-tags span {
  padding: 3px 10px;
  background: rgba(26, 107, 255, 0.08);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--primary);
}

/* ---------- Skills Grid (Resume) ---------- */
.skills-category {
  margin-bottom: var(--space-xl);
}

.skills-category-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.skills-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* ---------- About Cards ---------- */
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  transition: all var(--transition);
}

.about-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px var(--shadow);
}

.about-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.about-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- Blog List ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition);
  cursor: pointer;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-hover);
  border-color: var(--primary);
}

.blog-card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.blog-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.blog-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.blog-card-tags span {
  padding: 3px 10px;
  background: rgba(26, 107, 255, 0.08);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--primary);
}

/* ---------- Blog Post Content ---------- */
.blog-post {
  max-width: 760px;
  margin: 0 auto;
}

.blog-post-header {
  margin-bottom: var(--space-2xl);
}

.blog-post-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.blog-post-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  gap: var(--space-lg);
}

.blog-post-content {
  font-size: 1rem;
  color: var(--text-primary);
  line-height: 1.8;
}

.blog-post-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.blog-post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.blog-post-content p {
  margin-bottom: var(--space-lg);
}

.blog-post-content ul,
.blog-post-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.blog-post-content li {
  margin-bottom: var(--space-sm);
}

.blog-post-content code {
  font-family: var(--font-mono);
  background: rgba(26, 107, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.blog-post-content pre {
  background: #1a1a2e;
  color: #e8ecf4;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

.blog-post-content pre code {
  background: none;
  padding: 0;
}

.blog-post-content blockquote {
  border-left: 3px solid var(--primary);
  padding-left: var(--space-lg);
  margin: var(--space-lg) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.blog-post-content img {
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
}

/* ---------- Back to Top ---------- */
.back-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: white;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
  box-shadow: 0 4px 12px rgba(26, 107, 255, 0.3);
}

.back-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(26, 107, 255, 0.4);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .hero-avatar img {
    width: 100px;
    height: 130px;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .hero-title {
    font-size: 1rem;
  }

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

  .projects-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

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

  .timeline-header {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-name {
    font-size: 1.8rem;
  }

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

  .section {
    padding: var(--space-2xl) 0;
  }
}