/* ============================================
   AI产品经理个人作品集 - Stripe 风格
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --primary: #635BFF;
    --primary-dark: #5851DB;
    --primary-light: #7A73FF;
    --primary-glow: rgba(99, 91, 255, 0.08);
    --bg-primary: #FFFFFF;
    --bg-secondary: #F6F9FC;
    --bg-card: #FFFFFF;
    --bg-card-hover: #FAFBFD;
    --text-primary: #0A2540;
    --text-secondary: #425466;
    --text-muted: #8993A4;
    --border: #E3E8EE;
    --border-hover: #C1C9D2;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 0 4px rgba(99, 91, 255, 0.1);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 200ms ease;
    --transition-slow: 600ms ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.highlight {
    color: var(--primary);
    -webkit-text-fill-color: var(--primary);
}

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: var(--bg-primary);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

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

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

.nav-links a {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: #6b7280;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    color: var(--primary);
    background: transparent;
}

.nav-links a.active {
    color: var(--primary);
    background: transparent;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 50%;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

.nav-cta {
    background: var(--primary) !important;
    color: white !important;
    padding: 8px 24px !important;
    border-radius: 100px !important;
    border: none !important;
    font-size: 0.8125rem !important;
    box-shadow: 0 2px 8px rgba(99, 91, 255, 0.25);
}

.nav-cta:hover {
    background: var(--primary-dark) !important;
    color: white !important;
    box-shadow: 0 4px 14px rgba(99, 91, 255, 0.35);
    opacity: 1;
    transform: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---------- Hero 区域 ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    padding: 120px 24px 80px;
    background: var(--bg-primary);
    max-width: 1200px;
    margin: 0 auto;
    gap: 48px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.grid-overlay {
    display: none;
}

.gradient-orb {
    display: none;
}

.orb-1,
.orb-2 {
    display: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: left;
    max-width: 480px;
    flex-shrink: 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--primary-glow);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 32px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.typing-text {
    color: var(--primary);
    position: relative;
}

.typing-text::after {
    content: '';
    display: none;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 40px;
    max-width: 560px;
}

.hero-visual {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.hero-graph {
    width: 100%;
    max-width: 380px;
    height: auto;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.tri-flow {
    stroke-dasharray: 8 5;
    stroke-linecap: round;
    animation: flowDash 3s linear infinite;
}

@keyframes flowDash {
    to { stroke-dashoffset: -39; }
}

.hero-subtitle {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: flex-start;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: none;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: none;
    box-shadow: var(--shadow-sm);
}

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

.btn-outline:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    color: var(--primary-dark);
    transform: none;
}

.hero-stats {
    display: flex;
    justify-content: flex-start;
    gap: 48px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    -webkit-text-fill-color: var(--text-primary);
    line-height: 1;
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    -webkit-text-fill-color: var(--text-primary);
}

.stat-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* 滚动指示器 */
.scroll-indicator {
    display: none;
}

.mouse {
    display: none;
}

.mouse-wheel {
    display: none;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* ---------- 通用 Section ---------- */
.section {
    padding: 96px 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--bg-secondary);
}

.section-header {
    text-align: left;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8125rem;
    color: var(--primary);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
    color: var(--text-primary);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    margin-top: 16px;
    max-width: 500px;
    line-height: 1.6;
}

/* ---------- 关于我 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 64px;
    align-items: center;
}

.about-intro {
    font-size: 1.125rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.highlight-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.highlight-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-glow);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.highlight-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.highlight-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0 !important;
    line-height: 1.6;
}

/* 技术栈可视化 */
.tech-stack-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    min-height: 350px;
}

.hub-spoke-graph {
    width: 100%;
    max-width: 360px;
    height: auto;
}

/* ---------- 专业技能 ---------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.skill-category:last-child {
    grid-column: 1 / -1;
}

.skill-category-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 28px;
    color: var(--text-primary);
}

.skill-category-title svg {
    color: var(--primary);
}

.skill-bars {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.875rem;
}

.skill-info span:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

.skill-info span:last-child {
    color: var(--primary);
    font-weight: 600;
}

.skill-progress {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    width: 0;
    transition: width 1.2s ease;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tag {
    padding: 10px 20px;
    background: var(--primary-glow);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--primary-glow);
    border-color: var(--primary);
    color: var(--primary);
    transform: none;
}

/* ---------- 项目经验 ---------- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.project-card:hover::before {
    opacity: 1;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.project-header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.project-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-glow);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.project-links {
    display: flex;
    gap: 8px;
}

.project-link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: var(--transition);
}

.project-link:hover {
    color: var(--primary);
    background: var(--primary-glow);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.project-header-left .project-title {
    margin-bottom: 0;
}

.project-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.project-desc strong {
    color: var(--text-primary);
    font-weight: 600;
}

.project-summary {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-card-featured {
    grid-column: 1 / -1;
    border: 2px solid var(--primary);
}

.project-badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    border-radius: 100px;
    letter-spacing: 0.02em;
}

.project-story {
    margin-bottom: 24px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.story-section {
    margin-bottom: 16px;
}

.story-section:last-child {
    margin-bottom: 0;
}

.story-section h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.story-section p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.project-metrics {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    margin-top: auto;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.metric {
    text-align: center;
    flex: 1;
}

.metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 4px;
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ---------- 工作经历 ---------- */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

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

.timeline-item {
    position: relative;
    padding-left: 40px;
    padding-bottom: 48px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
    box-shadow: none;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 32px;
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-company {
    font-size: 0.9375rem;
    color: var(--primary);
    margin-top: 4px;
}

.timeline-date {
    font-size: 0.8125rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.timeline-details {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timeline-details li {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
    line-height: 1.6;
}

.timeline-details li::before {
    content: '\25B8';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 600;
}

/* ---------- 教育背景 ---------- */
.edu-card-full {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.edu-card-full:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(99, 91, 255, 0.08);
}

.edu-card-left {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-shrink: 0;
}

.edu-watermark {
    position: absolute;
    right: 32px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.02;
    letter-spacing: 0.05em;
    pointer-events: none;
    user-select: none;
}

.edu-card {
    display: flex;
    gap: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: var(--transition);
}

.edu-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.edu-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-glow);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.edu-info h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.edu-school {
    font-size: 0.9375rem;
    color: var(--primary);
    font-weight: 500;
}

.edu-date {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin: 4px 0;
}

.edu-detail {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.certifications {
    text-align: center;
}


/* ---------- 联系方式 ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-glow);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.contact-card h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--text-primary);
}

.contact-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.contact-arrow {
    margin-left: auto;
    color: var(--text-muted);
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition);
}

.contact-card:hover .contact-arrow {
    opacity: 1;
    transform: translateX(0);
}

.cta-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, var(--primary-glow), transparent 70%);
    opacity: 0.5;
}

.cta-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    color: var(--text-primary);
}

.cta-card p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    position: relative;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
}

/* ---------- 页脚 ---------- */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-links a:hover {
    color: var(--primary);
}

/* ---------- 滚动动画 ---------- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 600ms ease,
                transform 600ms ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-visual {
        order: -1;
    }

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 16px;
        z-index: 999;
    }

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

    .nav-links a {
        font-size: 1.25rem;
        padding: 12px 24px;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

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

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

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

    .hero {
        padding: 100px 24px 60px;
    }

    .hero-stats {
        gap: 32px;
    }

    .section {
        padding: 64px 0;
    }

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

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

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

    .project-metrics {
        flex-direction: column;
        gap: 16px;
    }

    .metric {
        display: flex;
        align-items: center;
        gap: 12px;
        text-align: left;
    }

    .cta-card {
        padding: 32px 24px;
    }

    .hub-spoke-graph {
        max-width: 280px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-visual {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .stat-number {
        font-size: 2rem;
    }
}

/* ---------- 辅助动画 ---------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* 平滑滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* 选中文字颜色 */
::selection {
    background: var(--primary);
    color: white;
}