/* ========== 全局变量 ========== */
:root {
  --bg-primary: #faf9f7;
  --bg-secondary: #f3f0ec;
  --bg-tertiary: #e8e4dd;
  --surface: rgba(255, 255, 255, 0.55);
  --surface-hover: rgba(255, 255, 255, 0.72);
  --surface-border: rgba(255, 255, 255, 0.65);
  --text-primary: #1a1815;
  --text-secondary: #5c5852;
  --text-tertiary: #8a857d;
  --accent: #4f46e5;
  --accent-light: #6366f1;
  --accent-glow: rgba(79, 70, 229, 0.22);
  --accent-soft: rgba(79, 70, 229, 0.06);
  --shadow-xs: 0 1px 3px rgba(0,0,0,0.03), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 4px 14px -4px rgba(0,0,0,0.05), 0 2px 6px -2px rgba(0,0,0,0.03);
  --shadow-md: 0 12px 32px -8px rgba(0,0,0,0.07), 0 4px 12px -4px rgba(0,0,0,0.04);
  --shadow-lg: 0 24px 48px -12px rgba(0,0,0,0.1), 0 8px 20px -6px rgba(0,0,0,0.05);
  --shadow-xl: 0 40px 70px -20px rgba(0,0,0,0.12), 0 12px 30px -10px rgba(0,0,0,0.06);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --radius-full: 9999px;
  --transition-fast: 0.18s cubic-bezier(0.22, 0.61, 0.36, 1);
  --transition-smooth: 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', sans-serif;
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'STSong', 'SimSun', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', 'Menlo', monospace;
}

/* 主题颜色 - 靛蓝（默认） */
:root[data-color="indigo"] {
  --accent: #4f46e5;
  --accent-light: #6366f1;
  --accent-glow: rgba(79, 70, 229, 0.22);
  --accent-soft: rgba(79, 70, 229, 0.06);
}

/* 主题颜色 - 绿色 */
:root[data-color="green"] {
  --accent: #10b981;
  --accent-light: #34d399;
  --accent-glow: rgba(16, 185, 129, 0.22);
  --accent-soft: rgba(16, 185, 129, 0.06);
}

/* 主题颜色 - 蓝色 */
:root[data-color="blue"] {
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.22);
  --accent-soft: rgba(59, 130, 246, 0.06);
}

/* 主题颜色 - 紫色 */
:root[data-color="purple"] {
  --accent: #8b5cf6;
  --accent-light: #a78bfa;
  --accent-glow: rgba(139, 92, 246, 0.22);
  --accent-soft: rgba(139, 92, 246, 0.06);
}

/* 主题颜色 - 橙色 */
:root[data-color="orange"] {
  --accent: #f97316;
  --accent-light: #fb923c;
  --accent-glow: rgba(249, 115, 22, 0.22);
  --accent-soft: rgba(249, 115, 22, 0.06);
}

/* 主题颜色 - 粉色 */
:root[data-color="pink"] {
  --accent: #ec4899;
  --accent-light: #f472b6;
  --accent-glow: rgba(236, 72, 153, 0.22);
  --accent-soft: rgba(236, 72, 153, 0.06);
}

/* 主题颜色 - 红色 */
:root[data-color="red"] {
  --accent: #ef4444;
  --accent-light: #f87171;
  --accent-glow: rgba(239, 68, 68, 0.22);
  --accent-soft: rgba(239, 68, 68, 0.06);
}

/* 主题颜色 - 青色 */
:root[data-color="cyan"] {
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --accent-glow: rgba(6, 182, 212, 0.22);
  --accent-soft: rgba(6, 182, 212, 0.06);
}

/* 主题颜色 - 黄色 */
:root[data-color="yellow"] {
  --accent: #eab308;
  --accent-light: #facc15;
  --accent-glow: rgba(234, 179, 8, 0.22);
  --accent-soft: rgba(234, 179, 8, 0.06);
}

/* 暗色模式 */
[data-theme="dark"] {
  --bg-primary: #0c0b0a;
  --bg-secondary: #141210;
  --bg-tertiary: #1c1916;
  --surface: rgba(28,25,22,0.55);
  --surface-hover: rgba(36,32,28,0.72);
  --surface-border: rgba(60,55,48,0.5);
  --text-primary: #ede8e2;
  --text-secondary: #b0a99e;
  --text-tertiary: #7a7368;
  --accent: #818cf8;
  --accent-light: #a5b4fc;
  --accent-glow: rgba(129,140,248,0.2);
  --accent-soft: rgba(129,140,248,0.07);
  --shadow-xs: 0 1px 3px rgba(0,0,0,0.15),0 1px 2px rgba(0,0,0,0.12);
  --shadow-sm: 0 4px 14px -4px rgba(0,0,0,0.25),0 2px 6px -2px rgba(0,0,0,0.15);
  --shadow-md: 0 12px 32px -8px rgba(0,0,0,0.35),0 4px 12px -4px rgba(0,0,0,0.2);
  --shadow-lg: 0 24px 48px -12px rgba(0,0,0,0.45),0 8px 20px -6px rgba(0,0,0,0.3);
  --shadow-xl: 0 40px 70px -20px rgba(0,0,0,0.5),0 12px 30px -10px rgba(0,0,0,0.35);
}

/* 暗色模式下的主题颜色 */
[data-theme="dark"][data-color="green"] {
  --accent: #34d399;
  --accent-light: #6ee7b7;
  --accent-glow: rgba(52, 211, 153, 0.2);
  --accent-soft: rgba(52, 211, 153, 0.07);
}
[data-theme="dark"][data-color="blue"] {
  --accent: #60a5fa;
  --accent-light: #93c5fd;
  --accent-glow: rgba(96, 165, 250, 0.2);
  --accent-soft: rgba(96, 165, 250, 0.07);
}
[data-theme="dark"][data-color="purple"] {
  --accent: #a78bfa;
  --accent-light: #c4b5fd;
  --accent-glow: rgba(167, 139, 250, 0.2);
  --accent-soft: rgba(167, 139, 250, 0.07);
}
[data-theme="dark"][data-color="orange"] {
  --accent: #fb923c;
  --accent-light: #fdba74;
  --accent-glow: rgba(251, 146, 60, 0.2);
  --accent-soft: rgba(251, 146, 60, 0.07);
}
[data-theme="dark"][data-color="pink"] {
  --accent: #f472b6;
  --accent-light: #f9a8d4;
  --accent-glow: rgba(244, 114, 182, 0.2);
  --accent-soft: rgba(244, 114, 182, 0.07);
}
[data-theme="dark"][data-color="red"] {
  --accent: #f87171;
  --accent-light: #fca5a5;
  --accent-glow: rgba(248, 113, 113, 0.2);
  --accent-soft: rgba(248, 113, 113, 0.07);
}
[data-theme="dark"][data-color="cyan"] {
  --accent: #22d3ee;
  --accent-light: #67e8f9;
  --accent-glow: rgba(34, 211, 238, 0.2);
  --accent-soft: rgba(34, 211, 238, 0.07);
}
[data-theme="dark"][data-color="yellow"] {
  --accent: #facc15;
  --accent-light: #fde047;
  --accent-glow: rgba(250, 204, 21, 0.2);
  --accent-soft: rgba(250, 204, 21, 0.07);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; scrollbar-gutter:stable; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.5s, color 0.35s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: geometricPrecision;
  min-height: 100vh;
  letter-spacing: -0.01em;
  position: relative;
}

body::before {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 25% 15%, var(--accent-soft) 0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 75% 70%, rgba(168,139,250,0.04) 0%, transparent 50%),
    radial-gradient(ellipse 40% 35% at 50% 40%, rgba(236,180,120,0.03) 0%, transparent 45%);
  animation: bgPulse 16s ease-in-out infinite;
}
@keyframes bgPulse {
  0% { opacity:0.7; transform:scale(1) rotate(0deg); }
  25% { opacity:0.85; }
  50% { opacity:0.7; transform:scale(1.04) rotate(1deg); }
  75% { opacity:0.85; }
  100% { opacity:0.7; transform:scale(1) rotate(0deg); }
}

body::after {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0; opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='60' height='60' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 60 0 L 0 0 0 60' fill='none' stroke='%23000' stroke-width='0.5'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23grid)'/%3E%3C/svg%3E");
  mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.5) 20%, rgba(0,0,0,0.5) 80%, transparent 100%);
}
[data-theme="dark"] body::after {
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='60' height='60' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 60 0 L 0 0 0 60' fill='none' stroke='%23fff' stroke-width='0.5'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23grid)'/%3E%3C/svg%3E");
}

h1,h2,h3,h4 { letter-spacing: -0.025em; font-weight:650; }
p,.project-card p,.hero-desc { letter-spacing:0.005em; }

.skip-link {
  position:absolute; top:-44px; left:0; background:var(--accent); color:#fff;
  padding:10px 20px; z-index:10001; text-decoration:none; border-radius:0 0 10px 0;
  transition:top 0.2s; font-weight:600; font-size:0.9rem;
}
.skip-link:focus { top:0; }

.scroll-progress {
  position:fixed; top:0; left:0; width:0%; height:3px;
  background:linear-gradient(90deg, var(--accent), var(--accent-light), #c4b5fd);
  z-index:10002; transition:width 0.08s linear; box-shadow:0 0 14px var(--accent-glow);
  border-radius:0 2px 2px 0;
}

.page-loader {
  position:fixed; top:0; left:0; width:0%; height:3px;
  background:linear-gradient(90deg, var(--accent), var(--accent-light), #c4b5fd);
  z-index:10003; transition:width 0.3s ease-out; box-shadow:0 0 18px var(--accent-glow);
  border-radius:0 2px 2px 0;
}

.mouse-glow {
  position:fixed; width:500px; height:500px; border-radius:50%;
  background:radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  pointer-events:none; z-index:9999; transform:translate(-50%, -50%);
  opacity:0; transition:opacity 0.5s; mix-blend-mode:screen; will-change:left,top;
}
body:hover .mouse-glow { opacity:0.75; }

#particle-canvas {
  position:fixed; top:0; left:0; width:100%; height:100%;
  z-index:0; opacity:0.25; pointer-events:none;
}
[data-theme="dark"] #particle-canvas { opacity:0.35; }

.back-to-top {
  position:fixed; bottom:32px; right:32px; width:48px; height:48px;
  border-radius:var(--radius-full); background:var(--surface);
  backdrop-filter:blur(20px); border:1px solid var(--surface-border);
  color:var(--text-primary); box-shadow:var(--shadow-md);
  cursor:pointer; opacity:0; visibility:hidden; transition:var(--transition-smooth);
  z-index:1000; display:flex; align-items:center; justify-content:center; font-size:1rem;
}
.back-to-top.visible { opacity:1; visibility:visible; }
.back-to-top:hover {
  background:var(--accent); color:#fff; transform:translateY(-5px) scale(1.06);
  box-shadow:0 16px 32px -8px var(--accent-glow); border-color:transparent;
}

.container { max-width:1120px; margin:0 auto; padding:0 32px; position:relative; z-index:2; }

.navbar {
  padding:14px 0; background:var(--surface); backdrop-filter:blur(24px);
  border-bottom:1px solid transparent; position:sticky; top:0; z-index:100;
  transition: transform 0.35s, background 0.35s, box-shadow 0.35s, border-color 0.35s;
}
.navbar.scrolled {
  background:var(--surface-hover);
  box-shadow:var(--shadow-sm), 0 0 40px rgba(0,0,0,0.03);
  border-bottom-color:var(--surface-border);
  padding: 12px 0;
}
.nav-container { display:flex; align-items:center; justify-content:space-between; }
.logo {
  font-weight:750; font-size:1.5rem; letter-spacing:-0.03em;
  background:linear-gradient(135deg, var(--text-primary) 20%, var(--accent) 80%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
  transition:opacity 0.25s; cursor:default; user-select:none;
}
.logo:hover { opacity:0.78; }
.nav-links { display:flex; gap:2.2rem; }
.nav-links a {
  text-decoration:none; color:var(--text-secondary); font-weight:500;
  font-size:0.95rem; transition:color 0.2s; position:relative; padding:6px 0;
}
.nav-links a::after {
  content:''; position:absolute; bottom:0; left:50%; width:0; height:2px;
  background:var(--accent); transition:width 0.25s; border-radius:2px; transform:translateX(-50%);
}
.nav-links a:hover, .nav-links a.active { color:var(--text-primary); }
.nav-links a:hover::after, .nav-links a.active::after { width:70%; }
.nav-links a.active { color:var(--accent); font-weight:600; }

.theme-toggle {
  background:var(--surface); backdrop-filter:blur(12px); border:1px solid var(--surface-border);
  border-radius:var(--radius-full); width:42px; height:42px; display:flex;
  align-items:center; justify-content:center; cursor:pointer; color:var(--text-secondary);
  transition:var(--transition-smooth); font-size:1rem; box-shadow:var(--shadow-xs);
}
.theme-toggle:hover { background:var(--accent); color:#fff; transform:rotate(20deg) scale(1.08); box-shadow:0 8px 22px -6px var(--accent-glow); border-color:transparent; }

.lang-selector {
  position: relative;
}
.lang-selector select {
  background:var(--surface); backdrop-filter:blur(12px); border:1px solid var(--surface-border);
  border-radius:var(--radius-full); padding:0 32px 0 14px; height:42px; min-width:100px;
  cursor:pointer; color:var(--text-secondary); font-size:0.75rem; font-weight:500;
  appearance:none; outline:none; transition:var(--transition-smooth);
  box-shadow:var(--shadow-xs);
}
.lang-selector select:hover {
  border-color:var(--accent);
}
.lang-selector::after {
  content:'▼';
  position:absolute; right:12px; top:50%; transform:translateY(-50%);
  font-size:0.5rem; color:var(--text-secondary); pointer-events:none;
}

.nav-actions { 
  display:flex; 
  align-items:center; 
  gap:8px; 
}

.theme-toggle-wrapper {
  display: flex;
  align-items: center;
}
.theme-toggle {
  background:var(--surface); backdrop-filter:blur(12px); border:1px solid var(--surface-border);
  border-radius:var(--radius-full); width:42px; height:42px; display:flex;
  align-items:center; justify-content:center; cursor:pointer; color:var(--text-secondary);
  transition:var(--transition-smooth); font-size:1rem; box-shadow:var(--shadow-xs);
}
.theme-toggle:hover { 
  background:var(--accent); 
  color:#fff; 
  transform:rotate(20deg) scale(1.08); 
  box-shadow:0 8px 22px -6px var(--accent-glow); 
  border-color:transparent; 
}

.color-selector,
.lang-selector {
  position: relative;
}
.color-selector select,
.lang-selector select {
  background:var(--surface); backdrop-filter:blur(12px); border:1px solid var(--surface-border);
  border-radius:var(--radius-md); padding:0 28px 0 12px; height:42px; min-width:75px;
  cursor:pointer; color:var(--text-secondary); font-size:0.72rem; font-weight:500;
  appearance:none; outline:none; transition:var(--transition-smooth);
  box-shadow:var(--shadow-xs);
}
.color-selector select:hover,
.lang-selector select:hover {
  border-color:var(--accent);
}
.color-selector::after,
.lang-selector::after {
  content:'▼';
  position:absolute; right:10px; top:50%; transform:translateY(-50%);
  font-size:0.45rem; color:var(--text-secondary); pointer-events:none;
}

section { padding:90px 0; position:relative; z-index:2; }

h2 {
  font-size:2.5rem; font-weight:700; letter-spacing:-0.03em; margin-bottom:44px;
  color:var(--text-primary); display:inline-block; position:relative;
  opacity:0; transform:translateY(24px); transition:0.6s cubic-bezier(0.22,0.61,0.36,1);
}
h2::after {
  content:''; position:absolute; bottom:-12px; left:0; width:44px; height:4px;
  background:linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius:4px; opacity:0.8;
}
h2.visible { opacity:1; transform:translateY(0); }

.breadcrumb {
  margin-bottom:10px; font-size:0.88rem; color:var(--text-tertiary);
  display:flex; align-items:center; gap:8px; font-weight:500;
}
.breadcrumb a { color:var(--accent); text-decoration:none; transition:opacity 0.2s; }
.breadcrumb a:hover { opacity:0.7; text-decoration:underline; }
.breadcrumb .separator { opacity:0.4; }
.breadcrumb .current { opacity:0.7; }

.hero { display:flex; align-items:center; gap:70px; flex-wrap:wrap; min-height:75vh; padding-top:30px; padding-bottom:30px; }
.hero-content { flex:1; opacity:0; transform:translateY(20px); transition:0.6s 0.15s; }
.hero-content.visible { opacity:1; transform:translateY(0); }
.badge {
  background:var(--accent-soft); color:var(--accent); padding:7px 18px;
  border-radius:var(--radius-full); font-size:0.85rem; font-weight:600;
  display:inline-flex; align-items:center; gap:7px; margin-bottom:26px;
  border:1px solid rgba(79,70,229,0.15);
}
.hero-content h1 {
  font-size:clamp(2.6rem, 5.5vw, 4rem); font-weight:750; line-height:1.1;
  margin-bottom:22px; letter-spacing:-0.035em;
}
.highlight {
  background:linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 50%, #c4b5fd 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
  background-size:200% 200%; animation:shimmer 4s infinite;
}
@keyframes shimmer {
  0%,100% { background-position:0% 50%; }
  50% { background-position:100% 50%; }
}
.cursor {
  display:inline-block; width:3px; margin-left:4px; background:var(--accent);
  animation:blink 1s infinite; border-radius:2px; height:0.85em; vertical-align:text-bottom;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
.hero-desc { font-size:1.15rem; color:var(--text-secondary); margin-bottom:36px; max-width:500px; }
.hero-avatar {
  width:270px; height:270px; border-radius:32% 68% 65% 35% / 28% 30% 70% 72%;
  object-fit:cover; box-shadow:var(--shadow-xl); border:3px solid var(--surface-border);
  opacity:0; transform:scale(0.88); transition:var(--transition-spring); flex-shrink:0;
}
.hero-avatar.visible { opacity:1; transform:scale(1); }
.hero-avatar:hover { border-radius:42% 58% 55% 45% / 38% 40% 60% 62%; box-shadow:0 40px 70px -16px var(--accent-glow); border-color:rgba(79,70,229,0.3); }

.btn-group { display:flex; gap:16px; flex-wrap:wrap; }
.btn {
  padding:14px 32px; border-radius:var(--radius-full); text-decoration:none;
  font-weight:600; font-size:0.95rem; transition:var(--transition-smooth);
  position:relative; overflow:hidden; display:inline-flex; align-items:center; gap:8px;
  cursor:pointer; border:none; outline:none;
}
.btn-primary { background:var(--accent); color:#fff; box-shadow:0 10px 24px -6px var(--accent-glow); }
.btn-primary:hover { transform:translateY(-4px); box-shadow:0 18px 36px -10px var(--accent-glow); background:var(--accent-light); }
.btn-outline { background:var(--surface); border:1.5px solid var(--surface-border); color:var(--text-primary); backdrop-filter:blur(8px); }
.btn-outline:hover { background:var(--surface-hover); border-color:var(--accent); transform:translateY(-3px); box-shadow:var(--shadow-md); }

.ripple {
  position:absolute; border-radius:50%; background:rgba(255,255,255,0.45);
  transform:scale(0); animation:ripple-animation 0.6s ease-out; pointer-events:none;
}
@keyframes ripple-animation { to { transform:scale(4); opacity:0; } }

.filter-container { display:flex; gap:12px; margin-bottom:42px; flex-wrap:wrap; }
.filter-btn {
  background:var(--surface); backdrop-filter:blur(10px); border:1.5px solid var(--surface-border);
  padding:10px 24px; border-radius:var(--radius-full); font-weight:550;
  font-size:0.9rem; color:var(--text-secondary); cursor:pointer;
  transition:var(--transition-smooth); box-shadow:var(--shadow-xs);
}
.filter-btn:hover { background:var(--surface-hover); color:var(--text-primary); border-color:var(--accent); }
.filter-btn.active { background:var(--accent); color:#fff; border-color:var(--accent); box-shadow:0 10px 22px -6px var(--accent-glow); font-weight:600; }

.skeleton-card {
  background:var(--surface); backdrop-filter:blur(16px); border-radius:var(--radius-xl);
  padding:32px; min-height:260px; border:1px solid var(--surface-border);
  box-shadow:var(--shadow-sm); animation:skeleton-pulse 1.8s infinite;
}
@keyframes skeleton-pulse { 0%,100%{opacity:0.55} 50%{opacity:0.25} }

.project-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:28px; }
.project-card {
  background:var(--surface); backdrop-filter:blur(20px); border-radius:var(--radius-xl);
  padding:34px 32px; box-shadow:var(--shadow-sm); border:1px solid var(--surface-border);
  transition:var(--transition-smooth), opacity 0.4s, transform 0.4s;
  opacity:0; transform:translateY(28px); will-change:transform; position:relative;
  overflow:hidden; cursor:default;
}
.project-card::before {
  content:''; position:absolute; top:0; left:0; width:100%; height:100%;
  background:radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(255,255,255,0.12) 0%, transparent 55%);
  opacity:0; transition:opacity 0.4s; pointer-events:none; z-index:1;
}
[data-theme="dark"] .project-card::before { background:radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(255,255,255,0.06) 0%, transparent 55%); }
.project-card:hover::before { opacity:1; }
.project-card.visible { opacity:1; transform:translateY(0); }
.project-card:hover {
  transform:translateY(-10px) scale(1.015);
  box-shadow:var(--shadow-lg), 0 0 0 1px rgba(79,70,229,0.2), 0 0 60px rgba(79,70,229,0.1);
  border-color:rgba(79,70,229,0.3);
}
.project-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(79,70,229,0.03) 50%,
    transparent 70%
  );
  transform: rotate(45deg);
  transition: all 0.6s ease;
  opacity: 0;
}
.project-card:hover::after {
  opacity: 1;
  transform: translateX(100%) rotate(45deg);
}
.project-card { animation:card-appear 0.45s cubic-bezier(0.22,0.61,0.36,1); }
@keyframes card-appear { 0%{opacity:0; transform:scale(0.9);} 100%{opacity:1; transform:scale(1);} }
.project-icon { font-size:2.6rem; color:var(--accent); margin-bottom:20px; transition:transform 0.35s cubic-bezier(0.34,1.56,0.64,1); display:inline-block; }
.project-card:hover .project-icon { transform:scale(1.12) rotate(-4deg); }
.project-card h3 { font-size:1.55rem; font-weight:700; margin-bottom:12px; }
.project-card p { color:var(--text-secondary); line-height:1.7; font-size:0.95rem; }
.project-tags { display:flex; flex-wrap:wrap; gap:9px; margin:20px 0; }
.tag {
  background:var(--accent-soft); backdrop-filter:blur(4px); padding:5px 16px;
  border-radius:var(--radius-full); font-size:0.78rem; font-weight:500;
  color:var(--accent); border:1px solid rgba(79,70,229,0.12); transition:var(--transition-fast);
}
.tag:hover { background:var(--accent); color:#fff; border-color:var(--accent); transform:translateY(-2px); }
.project-link { margin-top:24px; display:flex; gap:24px; }
.project-link a { text-decoration:none; color:var(--accent); font-weight:600; font-size:0.9rem; display:inline-flex; align-items:center; gap:6px; transition:var(--transition-fast); }
.project-link a:hover { transform:translateX(6px); opacity:0.8; }

.empty-state { grid-column:1/-1; text-align:center; padding:60px 20px; font-size:1.15rem; color:var(--text-secondary); background:var(--surface); border-radius:var(--radius-xl); border:1px solid var(--surface-border); backdrop-filter:blur(12px); }

.skills-container { display:flex; gap:28px; background:var(--surface); backdrop-filter:blur(20px); padding:38px 42px; border-radius:var(--radius-xl); border:1px solid var(--surface-border); box-shadow:var(--shadow-sm); opacity:0; transform:translateY(24px); transition:0.6s; }
.skills-container.visible { opacity:1; transform:translateY(0); }
.skill-category { flex:1; }
.skill-category h4 { font-weight:700; margin-bottom:20px; font-size:1.1rem; }
.skill-items { display:flex; flex-wrap:wrap; gap:10px; }
.skill-item { background:var(--accent-soft); padding:8px 20px; border-radius:var(--radius-full); font-size:0.85rem; font-weight:500; color:var(--accent); border:1px solid rgba(79,70,229,0.1); transition:var(--transition-smooth); }
.skill-item:hover { background:var(--accent); color:#fff; transform:scale(1.06); box-shadow:0 8px 18px -4px var(--accent-glow); }

.social-links { display:flex; gap:24px; margin-top:36px; flex-wrap:wrap; justify-content:center; }
.social-link {
  font-size:1.8rem;
  color:var(--text-secondary);
  transition:var(--transition-smooth);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:58px;
  height:58px;
  border-radius:var(--radius-full);
  background:var(--surface);
  backdrop-filter:blur(12px);
  border:1px solid var(--surface-border);
  box-shadow:var(--shadow-xs);
  text-decoration:none;
  position: relative;
  overflow: hidden;
}
.social-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  transition: width 0.4s, height 0.4s;
  opacity: 0;
}
.social-link:hover::before {
  width: 200px;
  height: 200px;
  opacity: 0.3;
}
.social-link:hover {
  color:#fff;
  background:var(--accent);
  transform:translateY(-8px) scale(1.1) rotate(-3deg);
  box-shadow:0 16px 30px -8px var(--accent-glow), 0 0 0 1px rgba(79,70,229,0.3);
  border-color:transparent;
  animation: bounce 0.4s ease;
}
@keyframes bounce {
  0%, 100% { transform: translateY(-8px) scale(1.1) rotate(-3deg); }
  50% { transform: translateY(-12px) scale(1.12) rotate(-3deg); }
}

.footer { padding:32px 0; text-align:center; border-top:1px solid var(--surface-border); color:var(--text-tertiary); margin-top:40px; backdrop-filter:blur(8px); font-size:0.9rem; }
.footer p { margin:4px 0; }
.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.stats-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
}
.stats-divider {
  color: var(--text-tertiary);
  opacity: 0.5;
}
/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  .navbar {
    padding: 12px 0;
  }
  .nav-container {
    flex-wrap: wrap;
    gap: 12px;
  }
  .nav-links {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 1rem;
    padding-top: 12px;
    border-top: 1px solid var(--surface-border);
    margin-top: 8px;
  }
  .nav-links a {
    font-size: 0.85rem;
    padding: 8px 12px;
    border-radius: var(--radius-md);
  }
  .nav-links a:hover, .nav-links a.active {
    background: var(--accent-soft);
  }
  .nav-actions {
    gap: 6px;
  }
  .theme-toggle {
    width: 38px;
    height: 38px;
    font-size: 0.85rem;
  }
  .color-selector select,
  .lang-selector select {
    height: 38px;
    min-width: 68px;
    font-size: 0.65rem;
    padding: 0 24px 0 10px;
  }
  .color-selector::after,
  .lang-selector::after {
    font-size: 0.4rem;
    right: 8px;
  }
  .hero {
    flex-direction: column-reverse;
    gap: 32px;
    text-align: center;
    min-height: auto;
    padding-top: 40px;
  }
  .hero-content {
    width: 100%;
  }
  .hero-content h1 {
    font-size: clamp(1.8rem, 7vw, 2.8rem);
    line-height: 1.3;
  }
  .hero-desc {
    max-width: 100%;
    font-size: 0.95rem;
    line-height: 1.7;
  }
  .btn-group {
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
  }
  .btn {
    min-width: 120px;
    padding: 12px 24px;
  }
  .hero-avatar {
    width: 180px;
    height: 180px;
  }
  section {
    padding: 50px 0;
  }
  h2 {
    font-size: 1.6rem;
    margin-bottom: 28px;
  }
  .project-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .project-card {
    padding: 22px 18px;
  }
  .project-card h3 {
    font-size: 1.1rem;
  }
  .project-card p {
    font-size: 0.85rem;
  }
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .skills-container {
    flex-direction: column;
    gap: 20px;
    padding: 20px 16px;
  }
  .skill-category h4 {
    margin-bottom: 12px;
    font-size: 0.95rem;
  }
  .skill-item {
    padding: 5px 12px;
    font-size: 0.75rem;
  }
  .filter-container {
    justify-content: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .filter-btn {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .social-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
  }
  .social-link {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
  }
  .footer {
    padding: 28px 0;
  }
  .footer p {
    font-size: 0.85rem;
  }
  .footer-note {
    font-size: 0.7rem !important;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 14px;
  }
  .nav-links {
    gap: 0.5rem;
  }
  .nav-links a {
    font-size: 0.78rem;
    padding: 6px 10px;
  }
  .hero-avatar {
    width: 150px;
    height: 150px;
  }
  .hero-content h1 {
    font-size: 1.6rem;
  }
  h2 {
    font-size: 1.4rem;
  }
  .btn {
    min-width: 100px;
    padding: 10px 20px;
    font-size: 0.85rem;
  }
  .project-card {
    padding: 18px 16px;
  }
  .social-link {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 12px;
    padding-right: 12px;
  }
  .nav-links {
    gap: 0.35rem;
  }
  .nav-links a {
    font-size: 0.72rem;
    padding: 5px 8px;
  }
  .hero-content h1 {
    font-size: 1.4rem;
  }
  .hero-desc {
    font-size: 0.88rem;
  }
  .hero-avatar {
    width: 130px;
    height: 130px;
  }
}

/* ========== 动画效果 ========== */

/* 滚动触发动画 */
.fade-up { 
  opacity: 0; 
  transform: translateY(30px); 
  transition: 0.55s cubic-bezier(0.22, 0.61, 0.36, 1); 
}

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

.fade-in {
  opacity: 0;
  transition: opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.fade-in.visible {
  opacity: 1;
}

.slide-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: 0.55s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

.slide-right {
  opacity: 0;
  transform: translateX(30px);
  transition: 0.55s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

.scale-in-center {
  opacity: 0;
  transform: scale(0.8);
  transition: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scale-in-center.visible {
  opacity: 1;
  transform: scale(1);
}

/* 交错动画延迟 */
.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; }

/* 悬停微交互 */
.hover-lift {
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hover-scale {
  transition: transform var(--transition-fast);
}

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

.hover-scale-lg {
  transition: transform var(--transition-smooth);
}

.hover-scale-lg:hover {
  transform: scale(1.05);
}

.hover-glow {
  transition: box-shadow var(--transition-smooth);
}

.hover-glow:hover {
  box-shadow: 0 0 30px var(--accent-glow);
}

.hover-underline {
  position: relative;
}

.hover-underline::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-smooth);
}

.hover-underline:hover::after {
  width: 100%;
}

/* 页面过渡动画 */
.page-transition {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.page-transition.active {
  opacity: 1;
  pointer-events: auto;
}

.page-transition-content {
  width: 60px;
  height: 60px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.8s linear infinite;
}

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

/* 脉冲动画 */
@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 20px var(--accent-glow);
  }
  50% {
    box-shadow: 0 0 40px var(--accent-glow), 0 0 60px var(--accent-glow);
  }
}

.pulse-glow {
  animation: pulse-glow 2s ease-in-out infinite;
}

/* 呼吸动画 */
@keyframes breathe {
  0%, 100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

.breathe {
  animation: breathe 3s ease-in-out infinite;
}

/* 摇摆动画 */
@keyframes sway {
  0%, 100% {
    transform: rotate(-3deg);
  }
  50% {
    transform: rotate(3deg);
  }
}

.sway {
  animation: sway 2s ease-in-out infinite;
}

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

.float {
  animation: float 3s ease-in-out infinite;
}

/* 打字光标动画 */
@keyframes cursor-blink {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

.cursor-blink {
  animation: cursor-blink 1s step-end infinite;
}

/* 数字计数动画 */
@keyframes count-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.count-up {
  animation: count-up 0.5s ease-out;
}

/* 进度条动画 */
@keyframes progress-shine {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.progress-shine {
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  background-size: 200% 100%;
  animation: progress-shine 2s infinite;
}

/* 波纹扩散动画 */
@keyframes ripple-out {
  0% {
    transform: scale(0);
    opacity: 0.6;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

.ripple-out {
  animation: ripple-out 0.6s ease-out forwards;
}

/* 弹跳动画 */
@keyframes bounce-in {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.bounce-in {
  animation: bounce-in 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* 渐入渐出动画 */
@keyframes fade-in-out {
  0%, 100% {
    opacity: 0.4;
  }
  50% {
    opacity: 1;
  }
}

.fade-in-out {
  animation: fade-in-out 3s ease-in-out infinite;
}
.loading-placeholder { grid-column:1/-1; text-align:center; padding:44px; color:var(--text-secondary); }

::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--accent); border-radius:10px; }
::selection { background:var(--accent); color:#fff; }

button:focus-visible, a:focus-visible, .filter-btn:focus-visible, .social-link:focus-visible { outline:3px solid var(--accent); outline-offset:3px; border-radius:8px; }
.btn:focus-visible { outline-offset:2px; }

@media (prefers-reduced-motion:reduce) {
  *, *::before, *::after { animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; }
  body::before { animation:none; }
  .cursor { animation:none; opacity:0; }
}

/* ========== 技能雷达图 ========== */
.radar-section {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 40px;
  padding: 30px;
  background: var(--surface);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-md);
}

.radar-container {
  position: relative;
  width: 320px;
  height: 320px;
}

#radar-chart {
  width: 100%;
  height: 100%;
}

.radar-legend {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.legend-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.legend-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.legend-item:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: translateX(4px);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 4px;
}

.legend-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.legend-value {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  margin-left: auto;
}

@media (max-width: 768px) {
  .radar-section {
    flex-direction: column;
    gap: 24px;
    padding: 20px;
  }
  
  .radar-container {
    width: 280px;
    height: 280px;
  }
  
  .radar-legend {
    width: 100%;
  }
  
  .legend-items {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .legend-item {
    padding: 8px 12px;
  }
}

@media (max-width: 480px) {
  .radar-container {
    width: 240px;
    height: 240px;
  }
  
  .legend-item {
    padding: 6px 10px;
    font-size: 0.75rem;
  }
}