/* ============================================
   个人网站 — 全局样式 & 主题系统
   ============================================ */

/* ---- CSS 变量：亮色主题 (默认) ---- */
:root {
  --bg-primary: #f0f4ff;
  --bg-secondary: #f9fafb;
  --bg-card: rgba(255,255,255,0.72);
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --border: rgba(0,0,0,0.08);
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: rgba(59,130,246,0.1);
  --gradient-start: #3b82f6;
  --gradient-end: #8b5cf6;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --nav-bg: rgba(255,255,255,0.75);
  --code-bg: #f3f4f6;
  --code-text: #1f2937;
  --tag-bg: rgba(59,130,246,0.1);
  --tag-text: #3b82f6;
}

/* ---- CSS 变量：暗色主题 ---- */
.dark {
  --bg-primary: #0a0f1e;
  --bg-secondary: #111827;
  --bg-card: rgba(30,41,59,0.65);
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border: rgba(255,255,255,0.08);
  --accent: #60a5fa;
  --accent-hover: #93bbfd;
  --accent-light: rgba(96,165,250,0.12);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  --nav-bg: rgba(15,23,42,0.7);
  --code-bg: rgba(15,23,42,0.6);
  --code-text: #e2e8f0;
  --tag-bg: rgba(96,165,250,0.15);
  --tag-text: #93bbfd;
}

/* ---- 基础样式 ---- */
* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(59,130,246,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(139,92,246,0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(59,130,246,0.03) 0%, transparent 80%);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.3s ease, background-image 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}
.dark body {
  background-image:
    radial-gradient(circle at 20% 20%, rgba(96,165,250,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(147,197,253,0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(96,165,250,0.04) 0%, transparent 80%);
}

/* ---- 导航栏 ---- */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.topnav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.topnav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  flex-shrink: 0;
}

.topnav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: 1;
  justify-content: center;
}

.topnav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  padding: 0.4rem 0.9rem;
  border-radius: 0.45rem;
  font-size: 0.92rem;
  font-weight: 500;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.topnav-links a:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.topnav-links a.nav-active {
  color: var(--accent);
  background: var(--accent-light);
  font-weight: 600;
}

/* 右侧按钮区 */
.topnav-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.topnav-theme {
  background: none;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  width: 36px; height: 36px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.topnav-theme:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

/* 汉堡菜单 */
.topnav-burger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  width: 36px; height: 36px;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

/* 移动端 */
@media (max-width: 768px) {
  .topnav-burger { display: flex; }

  .topnav-links {
    position: fixed;
    top: 56px;
    left: 0; right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.5rem 1rem 1rem;
    gap: 0;
    display: none;
    z-index: 999;
  }

  .topnav-links.show { display: flex; }

  .topnav-links a {
    width: 100%;
    padding: 0.7rem 1rem;
    font-size: 1rem;
  }
}

/* ---- 主内容区 ---- */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 1.5rem 3rem;
  min-height: calc(100vh - 200px);
}

/* ---- 页脚 ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ---- 卡片组件 ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  backdrop-filter: blur(20px) saturate(120%);
  -webkit-backdrop-filter: blur(20px) saturate(120%);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  background: rgba(255,255,255,0.85);
}
.dark .card:hover { background: rgba(30,41,59,0.8); }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- 标签 ---- */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ---- 搜索框 ---- */
.search-input {
  width: 100%;
  max-width: 400px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s ease;
  outline: none;
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* ---- 加载动画 ---- */
.loading-spinner {
  display: flex;
  justify-content: center;
  padding: 3rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---- Toast 消息 ---- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem 1.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  opacity: 0;
  transform: translateY(1rem);
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.success { border-left: 4px solid #10b981; }
.toast.error { border-left: 4px solid #ef4444; }

/* ---- Hero 打字机效果 ---- */
.typewriter {
  display: inline-block;
  border-right: 2px solid var(--accent);
  animation: blink 0.7s step-end infinite;
}

@keyframes blink {
  50% { border-color: transparent; }
}

/* ---- 渐变文字 ---- */
.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- 滚动渐显动画 ---- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- 代码块 (非 highlight.js 部分) ---- */
pre {
  background: var(--code-bg) !important;
  border-radius: 0.75rem !important;
  padding: 1rem 1.25rem !important;
  overflow-x: auto;
  font-size: 0.9rem;
  border: 1px solid var(--border);
}

code {
  font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
}

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

/* ---- 表单 ---- */
.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s ease;
  outline: none;
  font-family: inherit;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

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

.empty-state svg {
  width: 80px;
  height: 80px;
  margin-bottom: 1rem;
  opacity: 0.3;
}

/* ============================================
   动画增强样式
   ============================================ */

/* ---- Canvas 粒子背景 ---- */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

.dark #particles-canvas {
  opacity: 0.25;
}

/* ---- 滚动进度条 ---- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  z-index: 1001;
  transition: width 0.1s linear;
  border-radius: 0 3px 3px 0;
}

/* ---- 骨架屏 ---- */
.skeleton {
  background: linear-gradient(90deg,
    var(--bg-secondary) 25%,
    var(--border) 50%,
    var(--bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 0.5rem;
}

.skeleton-text { height: 1rem; margin-bottom: 0.5rem; width: 80%; }
.skeleton-text:last-child { width: 60%; }
.skeleton-title { height: 1.5rem; margin-bottom: 1rem; width: 70%; }
.skeleton-avatar { width: 80px; height: 80px; border-radius: 50%; }
.skeleton-card { height: 200px; border-radius: 1rem; }

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- 卡片 3D 倾斜 ---- */
.card-tilt {
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.1s ease;
}

.card-tilt:hover {
  transform: scale(1.02);
}

.card-tilt .tilt-inner {
  transform: translateZ(0);
  transition: transform 0.3s ease;
}

/* ---- 浮动动画 ---- */
@keyframes floatUpDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-anim {
  animation: floatUpDown 4s ease-in-out infinite;
}

.float-delay-1 { animation-delay: 0.5s; }
.float-delay-2 { animation-delay: 1s; }
.float-delay-3 { animation-delay: 1.5s; }

/* ---- 渐变背景动画 ---- */
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.animated-gradient {
  background-size: 200% 200% !important;
  animation: gradientShift 4s ease infinite;
}

/* ---- 按钮波纹 ---- */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transform: scale(0);
  animation: ripple-anim 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple-anim {
  to { transform: scale(4); opacity: 0; }
}

/* ---- Hero 光晕 ---- */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  pointer-events: none;
  animation: glowPulse 6s ease-in-out infinite alternate;
}

.hero-glow-1 {
  width: 300px; height: 300px;
  background: var(--gradient-start);
  top: -50px; left: -100px;
}

.hero-glow-2 {
  width: 250px; height: 250px;
  background: var(--gradient-end);
  bottom: -50px; right: -80px;
  animation-delay: -3s;
}

@keyframes glowPulse {
  0% { transform: scale(1) translate(0, 0); opacity: 0.1; }
  100% { transform: scale(1.3) translate(20px, -20px); opacity: 0.2; }
}

/* ---- 数字跳动 ---- */
.count-up {
  display: inline-block;
  transition: all 0.3s ease;
}

/* ---- 页面入场动画 ---- */
@keyframes slideUpIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-enter {
  animation: slideUpIn 0.5s ease both;
}

.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.3s; }

/* ---- 卡片渐显瀑布流 ---- */
@keyframes cardReveal {
  from { opacity: 0; transform: translateY(40px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.card-reveal {
  animation: cardReveal 0.5s ease both;
}

/* ---- 消息滑入 ---- */
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide-in {
  animation: slideInRight 0.4s ease both;
}

/* ---- 抖动 (用于点赞等) ---- */
@keyframes shake {
  0%, 100% { transform: rotate(0); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(8deg); }
  60% { transform: rotate(-4deg); }
  80% { transform: rotate(4deg); }
}

.shake {
  animation: shake 0.5s ease;
}

/* ---- 脉冲 ---- */
@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(59,130,246,0.4); }
  70% { box-shadow: 0 0 0 12px rgba(59,130,246,0); }
  100% { box-shadow: 0 0 0 0 rgba(59,130,246,0); }
}

.pulse-ring {
  animation: pulse-ring 2s infinite;
}

/* ---- 技能条动画 ---- */
.skill-bar {
  height: 8px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  width: 0;
  transition: width 1.2s cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---- 管理后台样式 ---- */
.admin-body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
}

.admin-login {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.admin-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.admin-sidebar {
  width: 240px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 100;
}

.admin-main {
  margin-left: 240px;
  padding: 2rem;
}

.admin-tab {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  text-align: left;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  margin-bottom: 0.25rem;
}

.admin-tab:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.admin-tab.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

/* 简易富文本工具栏 */
.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem 0.75rem 0 0;
  background: var(--bg-secondary);
}

.editor-toolbar button,
.md-toolbar button {
  padding: 0.35rem 0.6rem;
  border: 1px solid transparent;
  border-radius: 0.375rem;
  background: transparent;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: all 0.15s ease;
}

.editor-toolbar button:hover,
.md-toolbar button:hover {
  background: var(--bg-card);
  border-color: var(--border);
  color: var(--text-primary);
}

.md-toolbar {
  display: flex;
  gap: 0.15rem;
  flex-wrap: wrap;
}

.editor-content {
  min-height: 300px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 0.75rem 0.75rem;
  background: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  overflow-y: auto;
  line-height: 1.8;
}

.editor-content:focus {
  border-color: var(--accent);
}

.editor-content img { max-width: 100%; border-radius: 0.5rem; }
.editor-content pre { background: var(--code-bg); padding: 1rem; border-radius: 0.5rem; overflow-x: auto; }

/* ---- 模态框 ---- */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
  padding: 1rem;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  max-width: 700px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px) saturate(120%);
  -webkit-backdrop-filter: blur(20px) saturate(120%);
  animation: slideUpIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ---- 标签输入组件 ---- */
.tag-input-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--bg-card);
  min-height: 44px;
  align-items: center;
}

.tag-input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.tag-input-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.6rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 9999px;
  font-size: 0.8rem;
}

.tag-input-chip button {
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  padding: 0;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.6;
}

.tag-input-chip button:hover { opacity: 1; }

.tag-input-field {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-primary);
  flex: 1;
  min-width: 80px;
  font-size: 0.9rem;
  padding: 0.2rem;
}

/* ---- 响应式管理后台 ---- */
@media (max-width: 768px) {
  .admin-sidebar {
    position: relative;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }
  .admin-main {
    margin-left: 0;
    padding: 1rem;
  }
  .modal {
    max-width: 95vw;
    padding: 1.25rem;
  }
}