/* ===== CSS 变量 ===== */
:root {
    --primary: #6c5ce7;
    --primary-dark: #5a4bd1;
    --primary-light: #a29bfe;
    --secondary: #fd79a8;
    --accent: #00cec9;

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #0a0a1a;
    --bg-card: #ffffff;

    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --text-light: #b2bec3;
    --text-inverse: #ffffff;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
    --shadow-glow: 0 0 30px rgba(108,92,231,0.15);

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

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

    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1200px;
    --nav-height: 72px;
}

/* 深色模式 */
[data-theme="dark"] {
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: #1a1a3a;
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-light: #6c6c88;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.4);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; outline: none; }

::selection {
    background: var(--primary);
    color: white;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: all var(--transition);
    padding: 0 0;
}

.navbar.scrolled {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(255,255,255,0.85);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(10,10,26,0.85);
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
    transition: color var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    transition: width var(--transition);
    border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: all var(--transition);
}

.theme-toggle:hover {
    background: var(--primary);
    color: white;
    transform: rotate(30deg);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 4px;
    transition: all var(--transition);
}

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

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

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

/* ===== 英雄区 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transform: scale(1.1);
    animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
    from { transform: scale(1.1); }
    to { transform: scale(1.2); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(0,0,0,0.75) 0%,
        rgba(0,0,0,0.4) 50%,
        rgba(108,92,231,0.3) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    padding: 24px;
    max-width: 800px;
}

.hero-greeting {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--primary-light);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.3s forwards;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 30%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.5s forwards;
}

.hero-subtitle {
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: rgba(255,255,255,0.9);
    opacity: 0;
    animation: fadeUp 0.8s ease 0.7s forwards;
}

.hero-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.9s forwards;
}

@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
    from { opacity: 0; transform: translateY(30px); }
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeUp 0.8s ease 1.1s forwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 20px rgba(108,92,231,0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(108,92,231,0.5);
}

.btn-outline {
    border-color: rgba(255,255,255,0.4);
    color: white;
}

.btn-outline:hover {
    border-color: white;
    background: rgba(255,255,255,0.1);
    transform: translateY(-3px);
}

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

.hero-social {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 40px;
    opacity: 0;
    animation: fadeUp 0.8s ease 1.3s forwards;
}

.hero-social a {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 1.2rem;
    transition: all var(--transition);
}

.hero-social a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.5);
    font-size: 0.8rem;
    letter-spacing: 2px;
    animation: bounce 2s infinite;
}

.scroll-indicator i {
    font-size: 1rem;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== 通用区块 ===== */
.section {
    padding: 120px 0;
    position: relative;
}

.section-dark {
    background: var(--bg-secondary);
}

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

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 50px;
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(253,121,168,0.1));
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--text-primary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ===== 关于我 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
}

.about-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.about-image-wrapper img {
    width: 100%;
    border-radius: var(--radius-lg);
    position: relative;
    z-index: 1;
}

.about-image-border {
    position: absolute;
    top: -12px;
    left: -12px;
    width: 100%;
    height: 100%;
    border: 3px solid var(--primary);
    border-radius: var(--radius-lg);
    z-index: 0;
    transition: all var(--transition);
}

.about-image-wrapper:hover .about-image-border {
    top: -16px;
    left: -16px;
}

.about-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 32px 0;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-plus {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ===== 作品集 ===== */
.project-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid transparent;
    transition: all var(--transition);
}

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

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(108,92,231,0.3);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    border: 1px solid transparent;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(108,92,231,0.1);
}

.project-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    opacity: 0;
    transition: all var(--transition);
}

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

.project-overlay a {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: all var(--transition);
    transform: translateY(20px);
}

.project-card:hover .project-overlay a {
    transform: translateY(0);
}

.project-overlay a:hover {
    background: var(--primary);
    color: white;
}

.project-card:nth-child(1) .project-overlay a { transition-delay: 0.05s; }
.project-card:nth-child(2) .project-overlay a { transition-delay: 0.1s; }

.project-info {
    padding: 20px;
}

.project-category {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 8px 0;
}

.project-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 技能 ===== */
.skills-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.skills-text h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.skills-text > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

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

.skill-item {
    width: 100%;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 600;
}

.skill-percent {
    color: var(--primary);
}

.skill-bar {
    width: 100%;
    height: 8px;
    border-radius: 10px;
    background: var(--bg-secondary);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    width: 0;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.skill-icon-card {
    padding: 24px 16px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.skill-icon-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(108,92,231,0.2);
}

.skill-icon-card i {
    font-size: 2rem;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.skill-icon-card span {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ===== 联系 ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

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

.contact-item i {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(253,121,168,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.contact-social {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.social-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all var(--transition);
}

.social-icon:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(108,92,231,0.1);
}

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

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 80px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.5fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.footer-brand p {
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.footer-links h4,
.footer-newsletter h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: rgba(255,255,255,0.5);
    margin-bottom: 10px;
    transition: color var(--transition);
}

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

.footer-newsletter p {
    color: rgba(255,255,255,0.5);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.newsletter-form {
    display: flex;
    gap: 8px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 16px;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.05);
    color: white;
    font-size: 0.9rem;
}

.newsletter-form button {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.newsletter-form button:hover {
    transform: scale(1.1);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

.footer-bottom i {
    color: var(--secondary);
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: 0 4px 20px rgba(108,92,231,0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(108,92,231,0.5);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 32px 24px;
        gap: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        opacity: 0;
        transition: all var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section {
        padding: 80px 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        max-width: 450px;
        margin: 0 auto;
    }

    .skills-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }

    .stat-item {
        padding: 16px 12px;
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

/* ===== 动画工具 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 教育经历 ===== */
.edu-section {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--text-light);
    opacity: 0.6;
}

.edu-section h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
}

.edu-item {
    margin-bottom: 20px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
    flex-wrap: wrap;
    gap: 8px;
}

.edu-school { font-weight: 700; font-size: 1rem; }
.edu-date { font-size: 0.85rem; color: var(--text-secondary); }
.edu-major { font-size: 0.9rem; color: var(--text-secondary); margin: 4px 0 8px; }
.edu-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }

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

.edu-tag {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(253,121,168,0.1));
    color: var(--primary);
}

/* ===== 时间线 ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
    border-radius: 3px;
}

.timeline-card {
    position: relative;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.6s ease;
}

.timeline-card.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-marker {
    position: absolute;
    left: -33px;
    top: 24px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--bg-secondary);
    box-shadow: 0 0 0 3px var(--primary);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(108,92,231,0.1);
    transform: translateX(4px);
}

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

.timeline-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
}

.timeline-role {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    display: block;
    margin-top: 2px;
}

.timeline-date {
    font-size: 0.8rem;
    color: var(--text-light);
    padding: 4px 12px;
    border-radius: 50px;
    background: var(--bg-secondary);
    white-space: nowrap;
}

.timeline-details {
    list-style: none;
    padding: 0;
}

.timeline-details li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.timeline-details li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-light);
}

.timeline-details li:last-child {
    margin-bottom: 0;
}

/* ===== 项目详情（宽版卡片） ===== */
.project-card-wide {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.project-card-wide .project-image {
    aspect-ratio: auto;
    height: 100%;
    min-height: 280px;
}

.project-card-wide .project-info {
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-date {
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 4px 0 12px;
    display: block;
}

.project-details {
    list-style: none;
    padding: 0;
    margin: 8px 0 16px;
}

.project-details li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.project-details li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.project-stats-mini {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.project-stats-mini span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 50px;
    background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(253,121,168,0.08));
}

.project-stats-mini i {
    font-size: 0.75rem;
}

/* ===== 自我评价 ===== */
.eval-content {
    max-width: 900px;
    margin: 0 auto;
}

.eval-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.eval-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    border: 1px solid transparent;
}

.eval-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(108,92,231,0.15);
}

.eval-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(253,121,168,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 1.4rem;
    color: var(--primary);
}

.eval-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.eval-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 响应式扩展 ===== */
@media (max-width: 768px) {
    .project-card-wide {
        grid-template-columns: 1fr;
    }

    .project-card-wide .project-image {
        min-height: 200px;
    }

    .eval-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline-marker {
        left: -23px;
        width: 12px;
        height: 12px;
    }
}

@media (max-width: 480px) {
    .eval-grid {
        grid-template-columns: 1fr;
    }

    .project-stats-mini {
        flex-direction: column;
        gap: 8px;
    }
}

/* ===== 时间线卡片动画 ===== */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.timeline-card.visible {
    animation: slideInLeft 0.6s ease forwards;
}

.timeline-card:nth-child(2).visible { animation-delay: 0.15s; }
.timeline-card:nth-child(3).visible { animation-delay: 0.3s; }

/* ===== 技能标签（新） ===== */
.skills-modern {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.skill-group {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.skill-group:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(108,92,231,0.1);
    transform: translateY(-4px);
}

.skill-group-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.skill-group-header i {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(253,121,168,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--primary);
}

.skill-group-header h3 {
    font-size: 1rem;
    font-weight: 700;
}

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

.skill-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--primary);
    background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(253,121,168,0.08));
    border: 1px solid rgba(108,92,231,0.12);
    transition: all var(--transition);
}

.skill-tag:hover {
    background: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(253,121,168,0.15));
    transform: translateY(-1px);
}

/* ===== 作品集网格 ===== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.portfolio-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 1;
    cursor: pointer;
}

.portfolio-item:nth-child(1),
.portfolio-item:nth-last-child(1) {
    grid-column: span 2;
    aspect-ratio: 2 / 1;
}

.portfolio-item img,
.portfolio-item video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.portfolio-item:hover img,
.portfolio-item:hover video {
    transform: scale(1.08);
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 20px;
    opacity: 0;
    transition: opacity var(--transition);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-overlay span {
    color: white;
    font-size: 0.85rem;
    font-weight: 500;
    text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

.portfolio-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,0.9);
    color: var(--primary);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    z-index: 2;
}

.portfolio-play-btn:hover {
    background: white;
    transform: translate(-50%, -50%) scale(1.1);
}

/* ===== 响应式 - 作品集和技能 ===== */
@media (max-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .skills-modern {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .portfolio-item:nth-child(1),
    .portfolio-item:nth-last-child(1) {
        grid-column: span 2;
        aspect-ratio: 16 / 9;
    }
    .skills-modern {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    .portfolio-item:nth-child(1),
    .portfolio-item:nth-last-child(1) {
        aspect-ratio: 4 / 3;
    }
}
/* ===== 教育经历 ===== */
.education-highlights {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.education-highlights:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(108,92,231,0.1);
}

.edu-highlight-card {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px 0;
}

.edu-highlight-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(253,121,168,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--primary);
}

.edu-highlight-text h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.edu-highlight-text p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.edu-divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--primary-light), transparent);
    opacity: 0.2;
    margin: 0;
}

.edu-highlight-card:first-child {
    padding-top: 0;
}
.edu-highlight-card:last-child {
    padding-bottom: 0;
}

/* ===== 作品集筛选 ===== */
.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.portfolio-filter .filter-btn {
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid rgba(108,92,231,0.1);
    transition: all var(--transition);
    cursor: pointer;
}

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

.portfolio-filter .filter-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(108,92,231,0.3);
}

/* ===== 项目视频展示 ===== */
.project-card-reverse {
    grid-template-columns: 1fr 1fr;
    direction: ltr;
}

.project-showcase-video {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background: #000;
}

.project-showcase-video video {
    width: 100%;
    display: block;
    max-height: 400px;
    object-fit: contain;
}

@media (max-width: 768px) {
    .education-highlights {
        padding: 24px;
    }
    .edu-highlight-card {
        flex-direction: column;
        gap: 12px;
    }
    .project-card-reverse {
        grid-template-columns: 1fr;
    }
    .project-showcase-video video {
        max-height: 280px;
    }
    .portfolio-filter {
        gap: 8px;
    }
    .portfolio-filter .filter-btn {
        padding: 8px 18px;
        font-size: 0.82rem;
    }
}

/* ===== 作品集tall项 ===== */
.portfolio-item-tall {
    grid-row: span 2;
}