/* =============================================
   CSS 变量 & 主题
   ============================================= */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --bg: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card2: #16213e;
    --bg-glass: rgba(255,255,255,0.05);
    --border: rgba(255,255,255,0.08);
    --border-hover: rgba(99,102,241,0.5);

    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-dim: #64748b;

    --nav-h: 70px;
    --radius: 16px;
    --radius-sm: 8px;
    --shadow: 0 25px 50px rgba(0,0,0,0.5);
    --shadow-sm: 0 4px 20px rgba(0,0,0,0.3);
    --glow: 0 0 30px rgba(99,102,241,0.3);

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 浅色主题 */
[data-theme="light"] {
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-card2: #f1f5f9;
    --bg-glass: rgba(255,255,255,0.8);
    --border: rgba(0,0,0,0.08);
    --border-hover: rgba(99,102,241,0.4);
    --text: #1e293b;
    --text-muted: #64748b;
    --text-dim: #94a3b8;
    --shadow: 0 25px 50px rgba(0,0,0,0.1);
    --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
    --glow: 0 0 30px rgba(99,102,241,0.15);
}

/* =============================================
   全局重置
   ============================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* =============================================
   滚动条
   ============================================= */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

/* =============================================
   进度条
   ============================================= */
#progress-bar {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    z-index: 9999;
    width: 0%;
    transition: width 0.1s;
}

/* =============================================
   粒子背景
   ============================================= */
#particles-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.15;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0%   { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10%  { opacity: 0.15; }
    90%  { opacity: 0.15; }
    100% { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

/* =============================================
   导航栏
   ============================================= */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    z-index: 1000;
    transition: all var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

/* Logo */
.nav-logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    white-space: nowrap;
}
.logo-bracket { color: var(--text-dim); }
.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.logo-dot { color: var(--accent); }

/* 导航链接 */
.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all var(--transition);
}
.nav-link:hover {
    color: var(--text);
    background: var(--bg-glass);
}
.nav-link.active {
    color: var(--primary-light);
    background: rgba(99,102,241,0.1);
}
.nav-link i { font-size: 0.85rem; }
.nav-indicator {
    position: absolute;
    bottom: -2px; left: 50%;
    transform: translateX(-50%);
    width: 20px; height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

/* 工具栏 */
.nav-tools { display: flex; align-items: center; gap: 0.5rem; }
.tool-btn {
    width: 40px; height: 40px;
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    transition: all var(--transition);
    background: var(--bg-glass);
    border: 1px solid var(--border);
}
.tool-btn:hover {
    color: var(--primary);
    border-color: var(--border-hover);
    box-shadow: var(--glow);
}

/* 移动菜单 */
.mobile-menu-btn { display: none; }

.mobile-menu {
    display: none;
    position: absolute;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: 0.25rem;
    flex-direction: column;
    backdrop-filter: blur(20px);
}
.mobile-menu.open { display: flex; }

.mobile-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-weight: 500;
    transition: all var(--transition);
}
.mobile-link:hover, .mobile-link.active {
    background: rgba(99,102,241,0.1);
    color: var(--primary-light);
}

/* =============================================
   主内容区
   ============================================= */
.main-content {
    position: relative;
    z-index: 1;
    padding-top: var(--nav-h);
}

/* =============================================
   通用组件
   ============================================= */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section { padding: 6rem 0; }
.section-sm { padding: 4rem 0; }

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}
.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 1rem;
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.3);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-light);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}
.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}
.section-title span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* 卡片 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}
.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow), var(--glow);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
    white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99,102,241,0.5);
}
.btn-outline {
    border-color: var(--border-hover);
    color: var(--text);
    background: var(--bg-glass);
}
.btn-outline:hover {
    background: rgba(99,102,241,0.1);
    border-color: var(--primary);
    color: var(--primary-light);
}
.btn-ghost {
    color: var(--text-muted);
    padding: 0.5rem 1rem;
}
.btn-ghost:hover { color: var(--primary-light); }

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-primary { background: rgba(99,102,241,0.15); color: var(--primary-light); }
.badge-success { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-danger  { background: rgba(239,68,68,0.15);  color: var(--danger); }

/* =============================================
   Hero Section
   ============================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% -10%, rgba(99,102,241,0.2) 0%, transparent 60%),
        radial-gradient(ellipse 40% 40% at 90% 50%, rgba(236,72,153,0.1) 0%, transparent 50%),
        radial-gradient(ellipse 40% 40% at 10% 80%, rgba(6,182,212,0.1) 0%, transparent 50%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

/* Hero 文字 */
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.4rem 1rem;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.hero-eyebrow .dot {
    width: 8px; height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%,100% { box-shadow: 0 0 0 0 rgba(16,185,129,0.4); }
    50%      { box-shadow: 0 0 0 8px rgba(16,185,129,0); }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}
.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradient-shift 4s ease infinite;
}

@keyframes gradient-shift {
    0%   { background-position: 0% center; }
    50%  { background-position: 100% center; }
    100% { background-position: 0% center; }
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem; }

.hero-stats {
    display: flex;
    gap: 2.5rem;
}
.stat-item { text-align: center; }
.stat-num {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label { font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }

/* Hero 右侧卡片 */
.hero-visual { position: relative; }

.hero-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.hero-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(236,72,153,0.05));
    pointer-events: none;
}

.code-window {
    background: #0d1117;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 1.5rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.82rem;
}
.code-header {
    background: #161b22;
    padding: 0.6rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.code-dot {
    width: 12px; height: 12px;
    border-radius: 50%;
}
.code-dot.red    { background: #ff5f57; }
.code-dot.yellow { background: #febc2e; }
.code-dot.green  { background: #28c840; }
.code-filename { margin-left: auto; color: #6e7681; font-size: 0.75rem; }

.code-body { padding: 1.25rem; line-height: 2; }
.code-line { display: block; }
.c-keyword  { color: #ff7b72; }
.c-func     { color: #d2a8ff; }
.c-string   { color: #a5d6ff; }
.c-comment  { color: #6e7681; font-style: italic; }
.c-var      { color: #ffa657; }
.c-num      { color: #79c0ff; }
.c-punc     { color: #e6edf3; }
.c-indent   { padding-left: 1.5rem; }
.c-indent2  { padding-left: 3rem; }

.typing-cursor {
    display: inline-block;
    width: 2px; height: 1em;
    background: var(--primary);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
    margin-left: 2px;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }

/* 技能标签 */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}
.skill-tag {
    padding: 0.3rem 0.75rem;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all var(--transition);
}
.skill-tag:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(99,102,241,0.1);
}

/* 浮动卡片 */
.float-card {
    position: absolute;
    background: var(--bg-card2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    animation: float 4s ease-in-out infinite;
}
.float-card i { font-size: 1.1rem; }
.float-card-1 { top: -1.5rem; right: -1.5rem; animation-delay: 0s; }
.float-card-2 { bottom: 3rem;  left: -1.5rem; animation-delay: 2s; }

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

/* =============================================
   技能进度条
   ============================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: all var(--transition);
}
.skill-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--glow);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}
.skill-name { font-weight: 600; font-size: 0.95rem; }
.skill-pct  { font-size: 0.85rem; color: var(--primary-light); font-weight: 700; font-family: 'Fira Code', monospace; }

.skill-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.skill-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    width: 0%;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =============================================
   时间线
   ============================================= */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--secondary), transparent);
}

.timeline-item {
    position: relative;
    padding: 0 0 3rem 2rem;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -5px; top: 4px;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.2);
}

.timeline-date {
    font-size: 0.8rem;
    color: var(--primary-light);
    font-weight: 600;
    font-family: 'Fira Code', monospace;
    margin-bottom: 0.4rem;
}
.timeline-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}
.timeline-org {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}
.timeline-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* =============================================
   作品集
   ============================================= */
.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}
.filter-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid var(--border);
    background: var(--bg-glass);
    transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
    background: rgba(99,102,241,0.1);
    color: var(--primary-light);
    border-color: var(--primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}
.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-6px);
    box-shadow: var(--shadow), var(--glow);
}

.project-preview {
    height: 200px;
    position: relative;
    overflow: hidden;
}
.project-preview-bg {
    width: 100%; height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    transition: transform var(--transition-slow);
}
.project-card:hover .project-preview-bg { transform: scale(1.05); }

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    opacity: 0;
    transition: opacity var(--transition);
}
.project-card:hover .project-overlay { opacity: 1; }
.project-link-btn {
    padding: 0.5rem 1.25rem;
    background: white;
    color: #0f0f1a;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all var(--transition);
}
.project-link-btn:hover { background: var(--primary); color: white; }

.project-body { padding: 1.5rem; }
.project-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.project-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.project-desc  { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 1rem; }
.project-meta  {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-dim);
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.project-stars i { color: var(--warning); }

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

.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}
.post-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-sm), var(--glow);
}

.post-cover {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    position: relative;
    overflow: hidden;
}
.post-cover::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 60px;
    background: linear-gradient(transparent, var(--bg-card));
}

.post-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.post-meta { display: flex; gap: 1rem; font-size: 0.8rem; color: var(--text-dim); margin-bottom: 0.75rem; }
.post-meta i { margin-right: 0.3rem; }
.post-title { font-size: 1.05rem; font-weight: 700; line-height: 1.4; margin-bottom: 0.5rem; }
.post-title:hover { color: var(--primary-light); }
.post-excerpt { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; flex: 1; margin-bottom: 1rem; }
.post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.post-read {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--primary-light);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: gap var(--transition);
}
.post-read:hover { gap: 0.6rem; }

/* =============================================
   联系页
   ============================================= */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    align-items: start;
}

.contact-info { }
.contact-info h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
.contact-info p  { color: var(--text-muted); line-height: 1.8; margin-bottom: 2rem; }

.contact-items { display: flex; flex-direction: column; gap: 1rem; }
.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}
.contact-item:hover {
    border-color: var(--border-hover);
    background: rgba(99,102,241,0.05);
}
.contact-icon {
    width: 44px; height: 44px;
    border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
    font-size: 1.1rem;
    flex-shrink: 0;
}
.contact-label  { font-size: 0.78rem; color: var(--text-dim); margin-bottom: 0.1rem; }
.contact-value  { font-weight: 600; font-size: 0.9rem; }

/* 联系表单 */
.contact-form-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem;
}
.form-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.4rem; }
.form-subtitle { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 2rem; }

.form-group { margin-bottom: 1.25rem; }
.form-row    { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text);
}
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--transition);
    outline: none;
}
.form-control::placeholder { color: var(--text-dim); }
.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
textarea.form-control { resize: vertical; min-height: 140px; }

.form-submit {
    width: 100%;
    padding: 0.9rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: all var(--transition);
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}
.form-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99,102,241,0.5);
}
.form-submit:active { transform: translateY(0); }

/* =============================================
   关于页 - 价值观卡片
   ============================================= */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.25rem;
}
.value-card {
    padding: 2rem 1.5rem;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.value-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--glow);
}
.value-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}
.value-title { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.value-desc  { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* =============================================
   工具卡片
   ============================================= */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
}
.tool-card {
    padding: 1.5rem 1rem;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
    cursor: default;
}
.tool-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--glow);
}
.tool-icon { font-size: 2rem; margin-bottom: 0.5rem; display: block; }
.tool-name  { font-size: 0.85rem; font-weight: 600; }

/* =============================================
   页脚
   ============================================= */
.footer {
    position: relative;
    z-index: 1;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 4rem 0 2rem;
}

.footer-container { max-width: 1280px; margin: 0 auto; padding: 0 2rem; }

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand { max-width: 280px; }
.footer-brand .nav-logo { display: inline-block; margin-bottom: 1rem; }
.footer-brand p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 1.5rem; }

.footer-social { display: flex; gap: 0.5rem; }
.social-btn {
    width: 38px; height: 38px;
    border-radius: var(--radius-sm);
    background: var(--bg-glass);
    border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: all var(--transition);
}
.social-btn:hover {
    background: rgba(99,102,241,0.1);
    border-color: var(--primary);
    color: var(--primary-light);
    transform: translateY(-2px);
}

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text);
    margin-bottom: 1.25rem;
}
.footer-links ul { display: flex; flex-direction: column; gap: 0.75rem; }
.footer-links a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    transition: color var(--transition);
}
.footer-links a i { font-size: 0.7rem; color: var(--text-dim); }
.footer-links a:hover { color: var(--primary-light); }

.footer-contact h4 {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.25rem;
}
.footer-contact ul { display: flex; flex-direction: column; gap: 0.75rem; }
.footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.88rem;
    color: var(--text-muted);
}
.footer-contact i { color: var(--primary-light); width: 16px; text-align: center; }
.status-online { color: var(--success) !important; animation: pulse 2s infinite; }

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    color: var(--text-dim);
    flex-wrap: wrap;
    gap: 1rem;
}
.heart-icon { color: var(--secondary); animation: beat 1.2s ease infinite; }
@keyframes beat {
    0%,100% { transform: scale(1); }
    50%      { transform: scale(1.3); }
}

.footer-tech { display: flex; align-items: center; gap: 0.5rem; }

/* =============================================
   回到顶部
   ============================================= */
#back-to-top {
    position: fixed;
    bottom: 2rem; right: 2rem;
    width: 46px; height: 46px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(99,102,241,0.4);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}
#back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}
#back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(99,102,241,0.5);
}

/* =============================================
   Hero 装饰网格
   ============================================= */
.grid-decoration {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

/* =============================================
   页面横幅 (about/blog/portfolio/contact)
   ============================================= */
.page-banner {
    padding: 8rem 0 5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(99,102,241,0.15), transparent 70%);
    pointer-events: none;
}
.page-banner-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}
.page-banner-desc { font-size: 1.1rem; color: var(--text-muted); max-width: 500px; margin: 0 auto; }

/* =============================================
   搜索框
   ============================================= */
.search-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    max-width: 500px;
    margin: 2rem auto 0;
    transition: all var(--transition);
}
.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.search-box i { color: var(--text-dim); }
.search-box input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
}
.search-box input::placeholder { color: var(--text-dim); }

/* =============================================
   分页
   ============================================= */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 4rem;
}
.page-btn {
    width: 40px; height: 40px;
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    transition: all var(--transition);
}
.page-btn:hover, .page-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-links   { display: none; }
    .mobile-menu-btn { display: flex; }
    .footer-grid { grid-template-columns: 1fr; }
    .portfolio-grid,
    .blog-grid   { grid-template-columns: 1fr; }
    .form-row    { grid-template-columns: 1fr; }
    .hero-stats  { gap: 1.5rem; }
    .container   { padding: 0 1.25rem; }
    .section     { padding: 4rem 0; }
}

/* =============================================
   AOS 自定义
   ============================================= */
[data-aos] { pointer-events: none; }
[data-aos].aos-animate { pointer-events: auto; }

/* =============================================
   彩虹分隔线
   ============================================= */
.divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
    margin: 1.5rem auto;
}

/* =============================================
   Tooltip
   ============================================= */
[data-tooltip] { position: relative; }
[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: 0.4rem 0.8rem;
    background: var(--bg-card2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    z-index: 100;
}
[data-tooltip]:hover::after { opacity: 1; }

/* =============================================
   Loading Skeleton
   ============================================= */
.skeleton {
    background: linear-gradient(90deg, var(--border) 25%, var(--bg-glass) 50%, var(--border) 75%);
    background-size: 200% 100%;
    animation: skeleton-load 1.5s infinite;
    border-radius: var(--radius-sm);
}
@keyframes skeleton-load {
    0%   { background-position: 200% center; }
    100% { background-position: -200% center; }
}