/* ==========================================
   全局变量和重置
   ========================================== */
:root {
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --secondary-color: #10B981;
    --accent-color: #F59E0B;
    --danger-color: #EF4444;
    
    /* 浅色主题 */
    --bg-primary: #ffffff;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-gradient-start: #EFF6FF;
    --bg-gradient-end: #ECFDF5;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --border-color: #E5E7EB;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
}

/* 深色主题 */
[data-theme="dark"] {
    --primary-color: #60A5FA;
    --primary-dark: #3B82F6;
    --primary-light: #93C5FD;
    --secondary-color: #34D399;
    --accent-color: #FBBF24;
    --danger-color: #F87171;
    
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --bg-gradient-start: #0F172A;
    --bg-gradient-end: #064E3B;
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    --border-color: #374151;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --glass-bg: rgba(31, 41, 55, 0.7);
    --glass-border: rgba(75, 85, 99, 0.3);
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ==========================================
   加载动画
   ========================================== */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

/* ==========================================
   滚动进度条
   ========================================== */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    z-index: 9998;
    width: 0%;
    transition: width 0.1s ease;
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px var(--shadow-color);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: transform 0.3s ease;
}

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

.nav-logo i {
    font-size: 1.75rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.75rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
}

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

.search-box {
    position: relative;
}

.search-box input {
    padding: 0.625rem 2.5rem 0.625rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    width: 200px;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    width: 280px;
}

.search-box i {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
}

.btn-icon {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    transition: all 0.3s ease;
}

.btn-icon:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.mobile-menu-btn {
    display: none;
}

/* ==========================================
   通用按钮样式
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), #059669);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

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

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

/* ==========================================
   通用容器和布局
   ========================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
    position: relative;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

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

.section-subtitle {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 3rem 0 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ==========================================
   英雄区域
   ========================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-content {
    position: relative;
    z-index: 10;
}

.hero-layout {
    display: flex;
    gap: 3rem;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-avatar {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.avatar-placeholder {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    color: white;
    border: 5px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 20px 60px rgba(59, 130, 246, 0.3);
}

.avatar-hint {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-style: italic;
}

.hero-text {
    text-align: left;
    flex: 1;
    min-width: 300px;
    max-width: 600px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.keyword {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 20px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

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

.tag-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white !important;
    font-weight: 700;
}

.tag-primary i {
    color: white !important;
}

.typing-text {
    display: inline-block;
}

.typing-text::after {
    content: '|';
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
}

.tag {
    padding: 0.625rem 1.25rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 25px;
    font-weight: 600;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.tag:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.tag-small {
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    border-radius: 15px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 粒子背景 */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particles::before,
.particles::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1), transparent);
    animation: float 20s infinite ease-in-out;
}

.particles::before {
    top: 10%;
    left: 10%;
}

.particles::after {
    bottom: 10%;
    right: 10%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, 30px) scale(0.9); }
    75% { transform: translate(-50px, -30px) scale(1.05); }
}

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-tertiary);
    animation: bounce 2s infinite;
    z-index: 10;
}

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

/* ==========================================
   毛玻璃卡片效果
   ========================================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 0 8px 32px var(--shadow-color);
    transition: all 0.4s ease;
    overflow: hidden;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 45px var(--shadow-color);
    border-color: var(--primary-color);
}

.card {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 30px var(--shadow-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
}

.expand-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.expand-btn i {
    transition: transform 0.3s ease;
}

.expandable.expanded .expand-btn i {
    transform: rotate(180deg);
}

.card-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}

.expandable.expanded .card-content {
    max-height: 1000px;
}

/* ==========================================
   关于我模块
   ========================================== */
.about-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.about-story {
    padding: 2.5rem;
}

.story-header {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: center;
}

.story-avatar {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    flex-shrink: 0;
}

.story-intro h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.story-tagline {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.125rem;
}

.story-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

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

/* ==========================================
   个人简介网格
   ========================================== */
.profile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.info-list {
    list-style: none;
}

.info-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.info-list strong {
    color: var(--primary-color);
}

.check-list {
    list-style: none;
}

.check-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem 0;
}

.check-list i {
    color: var(--secondary-color);
    margin-top: 0.25rem;
}

/* ==========================================
   技能展示
   ========================================== */
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.filter-tab {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.skills-radar {
    max-width: 600px;
    margin: 0 auto 3rem;
}

.radar-container {
    aspect-ratio: 1;
    position: relative;
}

#skillsRadar {
    width: 100%;
    height: 100%;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    padding: 2rem;
    text-align: center;
}

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

.skill-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.skill-card h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-progress {
    margin-bottom: 1rem;
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 1s ease;
    width: 0%;
}

.progress-text {
    font-weight: 700;
    color: var(--primary-color);
}

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

/* ==========================================
   时间轴
   ========================================== */
.timeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
}

.timeline-section h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 0.25rem;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

.timeline-content {
    padding: 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.timeline-content h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.timeline-place {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* ==========================================
   课程展示
   ========================================== */
.course-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.course-filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.layout-toggle {
    display: flex;
    gap: 0.5rem;
}

.layout-btn {
    width: 44px;
    height: 44px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.courses-grid.list-layout {
    grid-template-columns: 1fr;
}

.course-card {
    padding: 2rem;
    position: relative;
}

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

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.375rem 0.875rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 15px;
}

.course-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(16, 185, 129, 0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.course-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.course-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.course-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.course-progress-info {
    flex: 1;
}

.progress-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    display: block;
    margin-bottom: 0.25rem;
}

.progress-bar-small {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill-small {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
    transition: width 1s ease;
}

.progress-value {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-left: 0.75rem;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--accent-color);
    font-weight: 700;
}

.course-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.course-actions {
    display: flex;
    gap: 0.75rem;
}

.course-expanded {
    display: none;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.course-card.expanded .course-expanded {
    display: block;
}

.expanded-section {
    margin-bottom: 1.5rem;
}

.expanded-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.expanded-section ul,
.expanded-section ol {
    list-style-position: inside;
    color: var(--text-secondary);
}

.expanded-section li {
    padding: 0.375rem 0;
}

/* ==========================================
   数据表格
   ========================================== */
.table-container {
    overflow-x: auto;
    border-radius: 16px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: 16px;
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    transition: background-color 0.3s ease;
}

.data-table tbody tr:hover {
    background: var(--bg-secondary);
}

.progress-bar-table {
    width: 100px;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    display: inline-block;
    margin-right: 0.5rem;
    vertical-align: middle;
}

.progress-fill-table {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
}

/* ==========================================
   项目轮播图
   ========================================== */
.projects-carousel {
    position: relative;
    margin-bottom: 3rem;
}

.carousel-container {
    display: flex;
    gap: 2rem;
    overflow: hidden;
    padding: 1rem;
}

.carousel-item {
    flex: 0 0 calc(33.333% - 1.5rem);
    padding: 2rem;
    text-align: center;
    transition: transform 0.5s ease;
}

.project-icon {
    width: 90px;
    height: 90px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.25rem;
    color: white;
}

.carousel-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-date {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 1rem !important;
    font-weight: 500;
}

.carousel-item p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.project-result {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.1));
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-result i {
    color: var(--accent-color);
    font-size: 1.25rem;
}

.highlight-result {
    color: var(--secondary-color);
    font-weight: 800;
    font-size: 1.125rem;
    background: linear-gradient(135deg, var(--secondary-color), #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 项目案例网格 */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
}

.project-card {
    padding: 2rem;
}

.project-header {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.project-icon-large {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    flex-shrink: 0;
}

.project-title-section h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-meta {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-content {
    margin-bottom: 1.5rem;
}

.project-section {
    margin-bottom: 1.25rem;
}

.project-section h4 {
    font-size: 1.125rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-section p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-left: 1.75rem;
}

.project-result-full {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.1));
    padding: 1.25rem;
    border-radius: 16px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    margin-top: 1rem;
}

.project-result-full h4 {
    font-size: 1.125rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-result-full p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-left: 1.75rem;
}

.project-visual {
    margin-top: 1.5rem;
}

.visual-placeholder {
    height: 200px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(16, 185, 129, 0.1));
    border-radius: 16px;
    border: 2px dashed var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    transition: all 0.3s ease;
}

.visual-placeholder:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(16, 185, 129, 0.15));
}

.visual-placeholder i {
    font-size: 3rem;
    color: var(--primary-color);
}

.visual-placeholder p {
    color: var(--text-tertiary);
    font-weight: 500;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .project-section p,
    .project-result-full p {
        margin-left: 0;
    }
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.carousel-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.carousel-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.carousel-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.carousel-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-dot.active {
    background: var(--primary-color);
    transform: scale(1.2);
}

/* 图表作品展示 */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.chart-card {
    padding: 2rem;
    text-align: center;
}

.chart-placeholder {
    height: 200px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(16, 185, 129, 0.1));
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.chart-placeholder i {
    font-size: 3rem;
    color: var(--primary-color);
}

.chart-placeholder p {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==========================================
   学习资源推荐
   ========================================== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.resource-card {
    padding: 2rem;
}

.resource-card h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.resource-list {
    list-style: none;
}

.resource-list li {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.resource-list li:hover {
    transform: translateX(5px);
    background: var(--bg-tertiary);
}

.resource-list li i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.resource-list li strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.resource-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.resource-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* 学习路线图 */
.roadmap {
    position: relative;
}

.roadmap-step {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    position: relative;
    z-index: 1;
}

.roadmap-dot {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
    flex-shrink: 0;
}

.roadmap-line {
    position: absolute;
    left: 9px;
    top: 30px;
    bottom: 30px;
    width: 2px;
    background: var(--border-color);
}

.roadmap-content h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.roadmap-content p {
    color: var(--text-secondary);
}

/* ==========================================
   联系方式
   ========================================== */
.contact-cta {
    max-width: 800px;
    margin: 0 auto 3rem;
}

.contact-cta .glass-card {
    padding: 2.5rem;
    text-align: center;
    border: 2px solid var(--primary-color);
}

.cta-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.cta-content h3 {
    font-size: 1.75rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.cta-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
}

.contact-info h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.contact-details {
    flex: 1;
}

.contact-details h4 {
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.contact-details p,
.contact-details a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-details a:hover {
    color: var(--primary-color);
}

.social-links h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.social-icon {
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

/* 联系表单 */
.contact-form {
    display: flex;
    flex-direction: column;
}

.contact-form .glass-card {
    padding: 2.5rem;
}

.contact-form h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ==========================================
   FAQ 常见问题
   ========================================== */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    padding: 0;
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    cursor: pointer;
}

.faq-question h4 {
    color: var(--text-primary);
    font-size: 1.125rem;
}

.faq-toggle {
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.faq-item.expanded .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 1.5rem;
    transition: all 0.4s ease;
}

.faq-item.expanded .faq-answer {
    max-height: 500px;
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-secondary);
}

/* ==========================================
   友情链接
   ========================================== */
.friend-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.friend-link {
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.friend-link:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.friend-link i {
    font-size: 1.25rem;
    color: var(--primary-color);
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info h4 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.footer-info p {
    color: var(--text-secondary);
}

.footer-stats {
    display: flex;
    gap: 2rem;
}

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

.stat-item i {
    display: block;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-item span {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-item p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-tertiary);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

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

/* ==========================================
   回到顶部按钮
   ========================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 55px;
    height: 55px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.5);
}

/* ==========================================
   模态框
   ========================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

.modal.open .modal-content {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    color: var(--text-primary);
}

.modal-close {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.25rem;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--danger-color);
    color: white;
}

.modal-body {
    padding: 2rem;
}

/* 欢迎模态框 */
.welcome-modal {
    max-width: 500px;
    text-align: center;
}

.welcome-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.welcome-modal h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.welcome-modal > p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.welcome-tips {
    text-align: left;
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.welcome-tips p {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.welcome-tips p:last-child {
    margin-bottom: 0;
}

.welcome-tips i {
    color: var(--primary-color);
}

/* ==========================================
   Toast 提示
   ========================================== */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--secondary-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    box-shadow: 0 8px 30px rgba(16, 185, 129, 0.3);
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.toast i {
    font-size: 1.25rem;
}

/* ==========================================
   动画类
   ========================================== */
.animate-fade-in {
    animation: fadeIn 0.8s ease forwards;
}

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

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .timeline-grid {
        grid-template-columns: 1fr;
    }
    
    .carousel-item {
        flex: 0 0 calc(50% - 1rem);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .search-box input {
        display: none;
    }
    
    .search-box:hover input,
    .search-box input:focus {
        display: block;
        position: absolute;
        right: 0;
        top: 100%;
        width: 250px;
        margin-top: 0.5rem;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .profile-grid,
    .skills-grid,
    .courses-grid,
    .resource-grid,
    .contact-grid,
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .course-controls {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .carousel-item {
        flex: 0 0 100%;
    }
    
    .footer-content,
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-stats {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 3rem 0;
    }
    
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
}

/* ==========================================
   打印样式
   ========================================== */
@media print {
    .navbar,
    .scroll-progress,
    .back-to-top,
    .btn,
    .modal,
    .toast,
    .particles,
    .scroll-hint,
    .footer-links,
    .nav-controls {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .section {
        page-break-inside: avoid;
    }
    
    .glass-card,
    .card {
        box-shadow: none !important;
        border: 1px solid #ccc;
    }
}