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

:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --secondary: #2c3e50;
    --accent: #9b59b6;
    --accent-dark: #8e44ad;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --info: #17a2b8;
    
    --dark: #0a0a0f;
    --dark-2: #12121a;
    --dark-3: #1a1a24;
    --dark-4: #2a2a3a;
    
    --gray-1: #7f8c8d;
    --gray-2: #95a5a6;
    --gray-3: #a0a0c0;
    --light: #ecf0f1;
    --white: #ffffff;
    
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.3);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50%;
    
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--white);
    background: var(--dark);
    min-height: 100vh;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 导航栏 ==================== */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--dark-4);
}

.logo-link {
    text-decoration: none;
    color: inherit;
}

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

.logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--white);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--white), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    text-decoration: none;
    transition: var(--transition);
}

.nav-text-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.nav-text {
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

.nav-text-en {
    color: var(--gray-3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-text-zh {
    color: var(--gray-2);
    font-size: 0.75rem;
}

.nav-link:hover .nav-text-en,
.nav-link.active .nav-text-en {
    color: var(--primary);
    transform: translateY(-2px);
}

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

.nav-line {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.3s ease;
}

.nav-link:hover .nav-line,
.nav-link.active .nav-line {
    width: 80%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar-link {
    display: block;
    cursor: pointer;
}

.user-avatar {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.1rem;
    transition: var(--transition);
    border: 2px solid transparent;
}

.user-avatar-link:hover .user-avatar,
.user-avatar-link.active .user-avatar {
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(52, 152, 219, 0.5);
    border-color: var(--white);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* ==================== Hero区域 ==================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 80px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.hero-name {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--white), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray-3);
    margin-bottom: 1.5rem;
    min-height: 2rem;
}

.typed-text {
    color: var(--primary);
}

.cursor {
    color: var(--primary);
    animation: blink 1s infinite;
}

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

.hero-desc {
    font-size: 1.1rem;
    color: var(--gray-2);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 0.9rem 2rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.cta-button.primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

.cta-button.primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.5);
}

.cta-button.secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--dark-4);
}

.cta-button.secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-3px);
}

.hero-social {
    display: flex;
    gap: 1rem;
}

.social-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--dark-4);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-3);
    font-size: 1.2rem;
    transition: var(--transition);
}

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

/* 代码窗口 */
.code-window {
    background: var(--dark-2);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--dark-4);
    max-width: 500px;
}

.window-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 1rem 1.2rem;
    background: var(--dark-3);
    border-bottom: 1px solid var(--dark-4);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }

.window-title {
    margin-left: 1rem;
    color: var(--gray-2);
    font-size: 0.85rem;
}

.window-body {
    padding: 1.5rem;
}

.window-body pre {
    margin: 0;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.keyword { color: #c678dd; }
.class-name { color: #e5c07b; }
.function { color: #61afef; }
.param { color: #e06c75; }
.string { color: #98c379; }
.comment { color: #5c6370; font-style: italic; }

.scroll-indicator {
    text-align: center;
    padding: 2rem;
    color: var(--gray-2);
    animation: bounce 2s infinite;
}

.scroll-indicator i {
    display: block;
    margin-top: 0.5rem;
}

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

/* ==================== 章节通用样式 ==================== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--white), var(--gray-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    color: var(--gray-2);
    font-size: 1.1rem;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title i {
    color: var(--primary);
}

/* ==================== 项目区域 ==================== */
.projects-section {
    padding: 6rem 0;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

.project-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 3rem;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.6rem 1.5rem;
    background: var(--dark-3);
    color: var(--gray-3);
    border: 1px solid var(--dark-4);
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--dark-3);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--dark-4);
    transition: var(--transition);
    opacity: 1;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.project-card.hidden {
    display: none;
}

.project-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.gradient-1 { background: linear-gradient(135deg, #667eea, #764ba2); }
.gradient-2 { background: linear-gradient(135deg, #f093fb, #f5576c); }
.gradient-3 { background: linear-gradient(135deg, #4facfe, #00f2fe); }
.gradient-4 { background: linear-gradient(135deg, #43e97b, #38f9d7); }
.gradient-5 { background: linear-gradient(135deg, #fa709a, #fee140); }
.gradient-6 { background: linear-gradient(135deg, #a18cd1, #fbc2eb); }

.project-icon {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.9);
}

.project-tag {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--secondary);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.project-content {
    padding: 1.5rem;
}

.project-content h3 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 0.8rem;
}

.project-desc {
    color: var(--gray-3);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.project-metrics {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--gray-2);
}

.project-metrics i {
    margin-right: 4px;
    color: var(--primary);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    background: rgba(52, 152, 219, 0.15);
    color: var(--primary);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 1rem;
    background: var(--dark-4);
    color: var(--white);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.placeholder-card {
    opacity: 0.6;
    border: 2px dashed var(--dark-4);
    background: transparent;
}

.placeholder-card:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--dark-4);
}

/* ==================== 技能区域 ==================== */
.skills-section {
    padding: 6rem 0;
    background: var(--dark-2);
}

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: var(--dark-3);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
    transition: var(--transition);
    position: relative;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

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

.skill-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: var(--primary);
    color: var(--white);
    padding: 0.2rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.skill-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--white);
    margin-bottom: 1.5rem;
}

.skill-card h3 {
    color: var(--white);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.skill-list {
    margin-bottom: 1.5rem;
}

.skill-list li {
    padding: 0.4rem 0;
    color: var(--gray-3);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.skill-list li i {
    color: var(--success);
    font-size: 0.8rem;
}

.skill-level {
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-level .level-bar {
    flex: 1;
    height: 6px;
    background: var(--dark-4);
    border-radius: 3px;
    overflow: hidden;
}

.skill-level .level-bar::before {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
}

.skill-level span {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 40px;
    text-align: right;
}

/* ==================== 统计数据 ==================== */
.stats-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

.stat-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ==================== 联系区域 & 页脚 ==================== */
footer {
    background: var(--dark-2);
    padding: 4rem 0 0;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 1.5fr 0.8fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--dark-4);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 1rem;
}

.footer-tagline {
    color: var(--primary);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.footer-desc {
    color: var(--gray-2);
    font-size: 0.95rem;
    line-height: 1.6;
}

.contact-form {
    background: var(--dark-3);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
}

.form-title {
    color: var(--white);
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
    position: relative;
}

.form-input {
    width: 100%;
    padding: 0.9rem 1rem;
    background: var(--dark-4);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary);
    background: var(--dark);
}

.form-input::placeholder {
    color: var(--gray-2);
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2395a5a6' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

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

.send-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 0.9rem 2rem;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    justify-content: center;
}

.send-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.footer-links h3 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links a {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--gray-2);
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
    transform: translateX(5px);
}

.footer-links i {
    width: 20px;
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    flex-wrap: wrap;
    gap: 1rem;
}

.copyright {
    color: var(--gray-2);
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--gray-2);
}

.footer-legal a {
    color: var(--gray-2);
    display: flex;
    align-items: center;
    gap: 4px;
}

.footer-legal a:hover {
    color: var(--white);
}

.footer-legal img {
    vertical-align: middle;
}

/* ==================== 回到顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ==================== User页面样式 ==================== */
.user-page {
    padding-top: 0;
}

.user-main {
    padding-top: 80px;
}

.profile-header {
    position: relative;
    margin-bottom: 2rem;
}

.profile-cover {
    height: 250px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    position: relative;
    overflow: hidden;
}

.cover-pattern {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.profile-container {
    max-width: 1000px;
    margin: -80px auto 0;
    padding: 0 2rem;
    position: relative;
    z-index: 10;
}

.profile-avatar-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--white);
    border: 5px solid var(--dark);
    box-shadow: var(--shadow-lg);
}

.avatar-status {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    border: 3px solid var(--dark);
}

.avatar-status.online {
    background: var(--success);
}

.profile-info {
    margin-bottom: 2rem;
}

.profile-name {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.profile-title {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.profile-location {
    color: var(--gray-2);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.profile-location i {
    margin-right: 5px;
}

.profile-location .separator {
    margin: 0 10px;
    color: var(--dark-4);
}

.profile-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 2rem;
}

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

.profile-stats .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.profile-stats .stat-label {
    color: var(--gray-2);
    font-size: 0.9rem;
}

.profile-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--dark-4);
}

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

.btn-github {
    background: var(--dark-3);
    color: var(--white);
}

.btn-github:hover {
    background: #333;
}

/* 关于我 */
.about-section {
    padding: 4rem 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.about-text p {
    color: var(--gray-3);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.highlight-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.highlight-item i {
    font-size: 1.5rem;
    color: var(--primary);
    margin-top: 4px;
}

.highlight-item h4 {
    color: var(--white);
    margin-bottom: 0.3rem;
}

.highlight-item p {
    color: var(--gray-2);
    font-size: 0.9rem;
}

.info-card {
    background: var(--dark-3);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
}

.info-card h3 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--dark-4);
}

.info-list li {
    display: flex;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--dark-4);
}

.info-list li:last-child {
    border-bottom: none;
}

.info-icon {
    width: 30px;
    color: var(--primary);
}

.info-label {
    width: 60px;
    color: var(--gray-2);
    font-size: 0.9rem;
}

.info-value {
    color: var(--white);
    font-size: 0.95rem;
}

.info-value a {
    color: var(--primary);
}

.info-value a:hover {
    text-decoration: underline;
}

/* 教育经历 */
.education-section {
    padding: 4rem 0;
    background: var(--dark-2);
}

.education-section .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--dark-4);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background: var(--primary);
    border: 3px solid var(--dark-2);
    transform: translateX(-7px);
}

.timeline-content {
    background: var(--dark-3);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.timeline-header h3 {
    color: var(--white);
    font-size: 1.2rem;
}

.timeline-date {
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
}

.timeline-subtitle {
    color: var(--gray-2);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.timeline-details {
    color: var(--gray-3);
    font-size: 0.95rem;
}

.timeline-details p {
    margin-bottom: 0.8rem;
}

.timeline-details strong {
    color: var(--white);
}

.course-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.5rem 0;
}

.course-tags span {
    background: var(--dark-4);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--gray-3);
}

.timeline-details ul {
    list-style: disc;
    padding-left: 1.5rem;
}

.timeline-details li {
    margin-bottom: 0.3rem;
}

/* 项目经历 */
.experience-section {
    padding: 4rem 0;
}

.experience-section .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.experience-grid {
    display: grid;
    gap: 2rem;
}

.exp-card {
    background: var(--dark-3);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
    transition: var(--transition);
}

.exp-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.exp-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.exp-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.exp-icon.python { background: linear-gradient(135deg, #3776ab, #ffd43b); }
.exp-icon.flask { background: linear-gradient(135deg, #000000, #333333); }
.exp-icon.mysql { background: linear-gradient(135deg, #4479a1, #00758f); }

.exp-header h3 {
    color: var(--white);
    font-size: 1.2rem;
}

.exp-type {
    display: inline-block;
    background: rgba(52, 152, 219, 0.2);
    color: var(--primary);
    padding: 0.2rem 0.8rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.exp-date {
    color: var(--gray-2);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.exp-date i {
    margin-right: 5px;
    color: var(--primary);
}

.exp-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.exp-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-3);
    font-size: 0.95rem;
}

.exp-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.exp-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.exp-tech span {
    background: var(--dark-4);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--gray-3);
}

/* 技能详情 */
.skills-detail-section {
    padding: 4rem 0;
    background: var(--dark-2);
}

.skills-detail-section .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

.skill-detail-card {
    background: var(--dark-3);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
}

.skill-detail-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.skill-icon-large {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
}

.skill-icon-large.python { background: linear-gradient(135deg, #3776ab, #ffd43b); }
.skill-icon-large.database { background: linear-gradient(135deg, #4479a1, #00758f); }
.skill-icon-large.web { background: linear-gradient(135deg, #61dafb, #21a1f1); }
.skill-icon-large.java { background: linear-gradient(135deg, #f89820, #5382a1); }

.skill-detail-header h3 {
    color: var(--white);
    font-size: 1.2rem;
}

.skill-detail-header p {
    color: var(--gray-2);
    font-size: 0.9rem;
}

.skill-detail-bar {
    height: 8px;
    background: var(--dark-4);
    border-radius: 4px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.skill-detail-bar .bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    transition: width 1s ease;
}

.skill-detail-list {
    display: grid;
    gap: 0.5rem;
}

.skill-detail-list li {
    color: var(--gray-3);
    font-size: 0.95rem;
    padding: 0.3rem 0;
}

/* 自我评价 */
.summary-section {
    padding: 4rem 0;
}

.summary-section .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.summary-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.summary-card {
    background: var(--dark-3);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--dark-4);
    transition: var(--transition);
}

.summary-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.summary-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.summary-card h3 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
}

.summary-card p {
    color: var(--gray-3);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-social {
        justify-content: center;
    }
    
    .code-window {
        max-width: 100%;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skills-detail-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    nav {
        padding: 1rem;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--dark-2);
        padding: 1rem;
        border-bottom: 1px solid var(--dark-4);
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-name {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .profile-stats {
        gap: 2rem;
    }
    
    .profile-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .summary-content {
        grid-template-columns: 1fr;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-legal {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.5rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .profile-name {
        font-size: 2rem;
    }
    
    .profile-avatar {
        width: 120px;
        height: 120px;
        font-size: 3rem;
    }
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.animate-fadeIn {
    animation: fadeIn 0.6s ease forwards;
}

.animate-slideInLeft {
    animation: slideInLeft 0.6s ease forwards;
}

.animate-slideInRight {
    animation: slideInRight 0.6s ease forwards;
}