/* 量子力学探索之旅 - 主页样式 */

/* Home Main Layout */
.home-main {
    padding-top: var(--navbar-height);
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: calc(100vh - var(--navbar-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-20) var(--spacing-6);
    overflow: hidden;
}

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

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-6);
}

.title-line {
    display: block;
}

.title-line:nth-child(2) {
    font-size: 1.2em;
    margin: var(--spacing-2) 0;
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-8);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    justify-content: center;
}

.hero-buttons .btn {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--text-lg);
}

/* Hero Decoration - Quantum Particles */
.hero-decoration {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    overflow: hidden;
}

/* 量子轨道 */
.quantum-orbit {
    position: absolute;
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: 50%;
    top: 50%;
    left: 50%;
}

.quantum-orbit-1 {
    width: 300px;
    height: 300px;
    margin: -150px 0 0 -150px;
    animation: spin 20s linear infinite;
}

.quantum-orbit-2 {
    width: 500px;
    height: 500px;
    margin: -250px 0 0 -250px;
    animation: spin 30s linear infinite reverse;
    border-color: rgba(99, 102, 241, 0.15);
}

.quantum-orbit-3 {
    width: 700px;
    height: 700px;
    margin: -350px 0 0 -350px;
    animation: spin 40s linear infinite;
    border-color: rgba(236, 72, 153, 0.1);
}

/* 量子粒子 */
.quantum-particle {
    position: absolute;
    border-radius: 50%;
    box-shadow: 0 0 20px currentColor;
}

.particle-electron {
    width: 12px;
    height: 12px;
    background: var(--color-secondary);
    color: rgba(34, 211, 238, 0.5);
    top: 30%;
    right: 20%;
    animation: particleDrift 4s ease-in-out infinite;
}

.particle-photon {
    width: 8px;
    height: 8px;
    background: var(--color-quantum-pink);
    color: rgba(236, 72, 153, 0.5);
    bottom: 30%;
    left: 15%;
    animation: particleDrift 5s ease-in-out infinite 1s;
}

.particle-quark {
    width: 6px;
    height: 6px;
    background: var(--color-quantum-purple);
    color: rgba(168, 85, 247, 0.5);
    top: 60%;
    right: 30%;
    animation: particleDrift 6s ease-in-out infinite 0.5s;
}

/* 介绍区域 */
.intro-section {
    padding: var(--spacing-16) 0;
    background: linear-gradient(180deg, transparent 0%, rgba(18, 18, 31, 0.5) 100%);
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: var(--text-lg);
    line-height: 1.8;
}

.intro-content p {
    margin-bottom: var(--spacing-4);
}

.intro-content strong {
    color: var(--color-quantum-purple);
}

/* Section 标题 */
.section-title {
    font-size: var(--text-3xl);
    text-align: center;
    margin-bottom: var(--spacing-4);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.section-desc {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
}

/* 课程区域 */
.courses-section {
    padding: var(--spacing-16) 0;
}

.courses-section-alt {
    background: rgba(18, 18, 31, 0.3);
}

/* 时期标签 */
.era-badge {
    display: inline-block;
    padding: var(--spacing-1) var(--spacing-3);
    background: rgba(168, 85, 247, 0.2);
    color: var(--color-quantum-purple);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-2);
}

/* 卡片网格 */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-6);
}

/* 双列网格用于并行线 */
.cards-grid-dual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
}

.track-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.track-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2);
    padding-bottom: var(--spacing-2);
    border-bottom: 2px solid var(--card-color, var(--color-primary));
}

/* 课程卡片 */
.course-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-6);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-decoration: none;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-color, var(--color-quantum-purple));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.course-card:hover {
    transform: translateY(-8px);
    border-color: var(--card-color, var(--color-quantum-purple));
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 30px rgba(168, 85, 247, 0.1);
}

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

/* 卡片颜色变体 */
.course-card[data-color="blue"] {
    --card-color: var(--color-blue);
}

.course-card[data-color="purple"] {
    --card-color: var(--color-purple);
}

.course-card[data-color="cyan"] {
    --card-color: var(--color-cyan);
}

.course-card[data-color="amber"] {
    --card-color: var(--color-amber);
}

.course-card[data-color="pink"] {
    --card-color: var(--color-pink);
}

.course-card[data-color="green"] {
    --card-color: var(--color-green);
}

.course-card[data-color="indigo"] {
    --card-color: var(--color-indigo);
}

.course-card[data-color="teal"] {
    --card-color: var(--color-teal);
}

.course-card[data-color="red"] {
    --card-color: var(--color-red);
}

.course-card[data-color="orange"] {
    --card-color: var(--color-orange);
}

/* 交互标记 */
.course-card[data-interactive="true"]::after {
    content: '⭐ 交互';
    position: absolute;
    top: var(--spacing-3);
    right: var(--spacing-3);
    padding: var(--spacing-1) var(--spacing-2);
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-accent);
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 600;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-4);
}

.card-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-3);
}

.card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    flex-grow: 1;
    line-height: 1.6;
}

.card-link {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--card-color, var(--color-quantum-purple));
    transition: transform var(--transition-fast);
}

.course-card:hover .card-link {
    transform: translateX(5px);
}

/* 时间线连接 */
.timeline-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-8) 0;
}

.timeline-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-text-muted);
}

.timeline-arrow::before {
    content: '';
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-quantum-purple), var(--color-text-muted));
}

.timeline-arrow::after {
    content: '▼';
    font-size: var(--text-sm);
}

/* 页脚 */
.footer {
    padding: var(--spacing-12) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

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

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-4);
}

.footer-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2);
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

/* 响应式 */
@media (max-width: 1024px) {
    .cards-grid-dual {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: var(--spacing-12) var(--spacing-4);
        min-height: auto;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }

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