/* ========================================
   高可玉个人网站 - 全局样式
   ======================================== */

/* CSS 变量 - 浅色/深色主题 */
:root {
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-accent: #8b5cf6;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-card: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-shadow: rgba(0, 0, 0, 0.08);
  --color-shadow-lg: rgba(0, 0, 0, 0.12);
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --gradient-hero: linear-gradient(135deg, #eef2ff 0%, #faf5ff 50%, #fdf2f8 100%);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.3s ease;
  --shadow-sm: 0 1px 3px var(--color-shadow);
  --shadow-md: 0 4px 12px var(--color-shadow);
  --shadow-lg: 0 8px 30px var(--color-shadow-lg);
  --shadow-card: 0 2px 8px var(--color-shadow);
}

/* 深色模式 */
.dark {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-lg: rgba(0, 0, 0, 0.5);
  --gradient-hero: linear-gradient(135deg, #1e1b4b 0%, #2e1065 50%, #4a044e 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'WenQuanYi Micro Hei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}

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

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

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

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.dark .navbar {
  background: rgba(15, 23, 42, 0.85);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
  min-width: 0;
}

.nav-logo-img {
  width: 48px !important;
  height: 48px !important;
  max-width: 48px !important;
  max-height: 48px !important;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
  border-radius: 50%;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.2;
  white-space: nowrap;
}

.nav-logo-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.nav-logo-subtitle {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-links a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.08);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.nav-btn:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-text);
}

/* ========================================
   通用组件
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
}

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

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-ghost {
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.btn-ghost:hover {
  background: var(--color-border);
}

/* 卡片 */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.3);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.tag.active {
  background: var(--color-primary);
  color: #fff;
}

/* ========================================
   首页 Hero
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 72px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
}

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

.hero-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: #fff;
  font-weight: 700;
  margin-bottom: 2rem;
  box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.1), 0 0 0 16px rgba(99, 102, 241, 0.05);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.1), 0 0 0 16px rgba(99, 102, 241, 0.05); }
  50% { box-shadow: 0 0 0 12px rgba(99, 102, 241, 0.15), 0 0 0 24px rgba(99, 102, 241, 0.08); }
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero-tag {
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  backdrop-filter: blur(4px);
}

.dark .hero-tag {
  background: rgba(30, 41, 59, 0.7);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.hero-stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ========================================
   项目卡片
   ======================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  display: flex;
  flex-direction: column;
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.project-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  flex-shrink: 0;
}

.project-status {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-weight: 500;
}

.status-active { background: #dcfce7; color: #166534; }
.status-maintenance { background: #fef9c3; color: #854d0e; }
.status-archived { background: #f1f5f9; color: #64748b; }

.dark .status-active { background: rgba(34, 197, 94, 0.2); color: #4ade80; }
.dark .status-maintenance { background: rgba(234, 179, 8, 0.2); color: #facc15; }
.dark .status-archived { background: rgba(100, 116, 139, 0.2); color: #94a3b8; }

.project-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.project-tech span {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: var(--color-bg-secondary);
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-links a {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.project-links a:hover {
  text-decoration: underline;
}

/* ========================================
   博客
   ======================================== */
.blog-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.blog-search {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.blog-search input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: var(--transition);
}

.blog-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.blog-search::before {
  content: '🔍';
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.blog-filters .tag {
  cursor: pointer;
  transition: var(--transition);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.blog-card {
  display: flex;
  flex-direction: column;
}

.blog-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.blog-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.blog-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  flex-grow: 1;
}

.blog-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.blog-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.blog-card-tags .tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
}

.read-more {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 500;
  white-space: nowrap;
}

/* ========================================
   关于页
   ======================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: start;
}

.about-sidebar {
  position: sticky;
  top: 100px;
}

.about-avatar-large {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: #fff;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.about-social {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.about-social a {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.about-social a:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.about-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.about-content p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

/* 技能条 */
.skills-section {
  margin-top: 3rem;
}

.skill-bar {
  margin-bottom: 1.25rem;
}

.skill-bar-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.skill-bar-track {
  height: 8px;
  background: var(--color-bg-secondary);
  border-radius: 999px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--gradient-primary);
  width: 0;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 时间线 */
.timeline {
  margin-top: 3rem;
  position: relative;
  padding-left: 2rem;
}

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

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.35rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-item h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.timeline-item .timeline-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ========================================
   回到顶部
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-3px);
}

/* ========================================
   Toast 通知
   ======================================== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-text);
  color: var(--color-bg);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  z-index: 2000;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========================================
   动画
   ======================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.slide-up {
  animation: slideUp 0.6s ease forwards;
}

/* ========================================
   文章详情
   ======================================== */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.article-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.5rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1rem;
}

.article-body ul,
.article-body ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body code {
  background: var(--color-bg-secondary);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Fira Code', 'Consolas', monospace;
}

.article-body pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 0.5rem 1rem;
  background: rgba(99, 102, 241, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

.article-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  gap: 1rem;
}

.article-nav a {
  flex: 1;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.article-nav a:hover {
  border-color: var(--color-primary);
  background: rgba(99, 102, 241, 0.05);
}

.article-nav-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.article-nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ========================================
   CTA 区域
   ======================================== */
.cta-section {
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  padding: 4rem 2rem;
  text-align: center;
  color: #fff;
  margin: 3rem 0;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 2rem;
}

.cta-section .btn {
  background: #fff;
  color: var(--color-primary);
}

.cta-section .btn:hover {
  background: var(--color-bg-secondary);
}

/* ========================================
   筛选器
   ======================================== */
.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.filter-btn {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  cursor: pointer;
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ========================================
   空状态
   ======================================== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 768px) {
  .nav-logo-img {
    width: 40px !important;
    height: 40px !important;
    max-width: 40px !important;
    max-height: 40px !important;
  }

  .nav-logo-title {
    font-size: 1rem;
  }

  .nav-logo-subtitle {
    font-size: 0.75rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .nav-toggle {
    display: flex;
  }

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

  .about-sidebar {
    position: static;
  }

  .hero-stats {
    gap: 1.5rem;
  }

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

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

  .section {
    padding: 3rem 0;
  }

  .hero {
    padding-top: 100px;
  }

  .article-nav {
    flex-direction: column;
  }
}

/* ========================================
   工具类
   ======================================== */
.text-center { text-align: center; }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 2rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.hidden { display: none; }