/* ===== 首页样式 ===== */

/* Hero区域 */
.hero {
    text-align: center;
    padding: 5rem 2rem 4rem;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.2) 0%, transparent 70%);
    z-index: -1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(240, 147, 251, 0.2));
    border: 1px solid var(--border);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--text-dim);
    margin-bottom: 1.5rem;
    animation: bounceIn 0.8s ease;
}

@keyframes bounceIn {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    letter-spacing: -2px;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 50%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-dim);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--text);
    text-decoration: none;
    border-radius: 14px;
    font-weight: 600;
    font-size: 1.05rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
}

.cta-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 50px rgba(102, 126, 234, 0.5);
}

.cta-btn.secondary {
    background: var(--card);
    border: 1px solid var(--border);
    box-shadow: none;
}

.cta-btn.secondary:hover {
    background: var(--card-hover);
    border-color: var(--primary);
}

/* 统计区域 */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.4s ease;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    display: inline-block;
    padding: 0.1em 0.15em;
}

.stat-label {
    color: var(--text-dim);
    margin-top: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
}

/* 课程展示区域 */
.course-showcase {
    max-width: 1400px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.course-showcase-header {
    text-align: center;
    margin-bottom: 3rem;
}

.course-showcase-header h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--text), var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 4s ease infinite;
}

.course-showcase-header p {
    color: var(--text-dim);
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
}

.course-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.25rem;
    position: relative;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(20px);
    cursor: pointer;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.course-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: var(--primary);
    box-shadow: 0 25px 80px rgba(102, 126, 234, 0.3);
    background: rgba(102, 126, 234, 0.05);
}

.course-card:hover::before {
    transform: scaleX(1);
}

.course-card .course-icon {
    width: 64px; height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 1.5rem;
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.3);
    transition: all 0.4s ease;
}

.course-card:hover .course-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.5);
}

.course-card h3 {
    color: var(--text);
    font-size: 1.35rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
    line-height: 1.4;
}

.course-card p {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card .course-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    padding: 0.75rem 1.5rem;
    background: rgba(79, 172, 254, 0.1);
    border-radius: 12px;
    border: 1px solid transparent;
}

.course-card:hover .course-cta {
    gap: 1rem;
    background: rgba(79, 172, 254, 0.15);
    border-color: var(--accent);
}

.course-badge {
    position: absolute;
    top: 1.5rem; right: 1.5rem;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(0, 242, 96, 0.15);
    color: var(--success);
    border: 1px solid rgba(0, 242, 96, 0.3);
}

.course-badge.coming {
    background: rgba(255, 165, 0, 0.15);
    color: #ffa500;
    border-color: rgba(255, 165, 0, 0.3);
}

/* 代码展示区域 */
.code-showcase {
    max-width: 1200px;
    margin: 6rem auto;
    padding: 0 2rem;
    position: relative;
}

.code-container {
    background: #0d0d0d;
    border: 1px solid #1a1a2e;
    border-radius: 12px;
    padding: 0;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    margin: 0 2rem;
}

.code-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 36px;
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    border-bottom: 1px solid #2a2a4a;
    border-radius: 12px 12px 0 0;
}

.code-container::after {
    content: '';
    position: absolute;
    top: 12px; left: 12px;
    width: 12px; height: 12px;
    background: #ff5f56;
    border-radius: 50%;
    box-shadow: 18px 0 0 #ffbd2e, 36px 0 0 #27ca40;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: absolute;
    top: 0; left: 60px;
    height: 36px;
}

.code-filename {
    color: #8892b0;
    font-size: 11px;
    font-family: 'Consolas', monospace;
    background: #252540;
    border: 1px solid #3a3a5a;
    border-radius: 6px;
    padding: 4px 14px;
    font-weight: 500;
}

.code-content {
    font-family: 'Consolas', 'Monaco', 'Fira Code', monospace;
    font-size: 0.95rem;
    line-height: 1.7;
    color: #e2e8f0;
    position: relative;
    padding: 48px 1.5rem 1.5rem;
}

.code-line {
    display: flex;
    opacity: 0;
    animation: codeFadeInLoop 12s ease-in-out infinite;
}

.code-line:nth-child(1) { animation-delay: 0.3s; }
.code-line:nth-child(2) { animation-delay: 0.8s; }
.code-line:nth-child(3) { animation-delay: 1.3s; }
.code-line:nth-child(4) { animation-delay: 1.8s; }
.code-line:nth-child(5) { animation-delay: 2.3s; }
.code-line:nth-child(6) { animation-delay: 2.8s; }
.code-line:nth-child(7) { animation-delay: 3.3s; }
.code-line:nth-child(8) { animation-delay: 3.8s; }
.code-line:nth-child(9) { animation-delay: 4.3s; }
.code-line:nth-child(10) { animation-delay: 4.8s; }

@keyframes codeFadeInLoop {
    0%, 5% { opacity: 0; transform: translateX(-20px); }
    8% { opacity: 1; transform: translateX(0); }
    88% { opacity: 1; transform: translateX(0); }
    92%, 100% { opacity: 0; transform: translateX(20px); }
}

.code-line-number {
    color: #64748b;
    width: 30px;
    text-align: right;
    margin-right: 1.5rem;
    user-select: none;
}

.code-cursor {
    display: inline-block;
    width: 8px;
    height: 1.2em;
    background: var(--accent);
    margin-left: 2px;
    animation: cursorBlink 0.8s ease-in-out infinite;
    box-shadow: 0 0 10px var(--accent);
}

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

.code-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(180deg, rgba(102, 126, 234, 0.03) 0%, transparent 50%, rgba(79, 172, 254, 0.03) 100%);
    pointer-events: none;
}

/* 滚动卡片 */
.features-scroll {
    position: relative;
    overflow: hidden;
    margin: 6rem 0;
    padding: 2rem 0;
}

.scroll-track {
    display: flex;
    animation: scrollAnimation 30s linear infinite;
}

@keyframes scrollAnimation {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.scroll-item {
    flex: 0 0 340px;
    margin-right: 2rem;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.4s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.scroll-item::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.scroll-item:hover {
    transform: scale(1.05);
    border-color: var(--primary);
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.2);
}

.scroll-item:hover::before {
    opacity: 1;
}

.scroll-item .scroll-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    filter: drop-shadow(0 4px 20px rgba(102, 126, 234, 0.3));
    transition: transform 0.4s ease;
}

.scroll-item:hover .scroll-icon {
    transform: scale(1.1) rotate(5deg);
}

.scroll-item h3 {
    color: var(--text);
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.scroll-item p {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.7;
}

.scroll-gradient-left, .scroll-gradient-right {
    position: absolute;
    top: 0; bottom: 0;
    width: 120px;
    z-index: 10;
    pointer-events: none;
}

.scroll-gradient-left {
    left: 0;
    background: linear-gradient(90deg, var(--dark), transparent);
}

.scroll-gradient-right {
    right: 0;
    background: linear-gradient(-90deg, var(--dark), transparent);
}

/* 高级课程预告 */
.advanced-preview {
    max-width: 1400px;
    margin: 6rem auto;
    padding: 0 2rem;
}

.advanced-preview-header {
    text-align: center;
    margin-bottom: 3rem;
}

.advanced-preview-header h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--accent), var(--success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.advanced-preview-header p {
    color: var(--text-dim);
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto;
}

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

.advanced-card {
    background: linear-gradient(145deg, rgba(102, 126, 234, 0.08), rgba(79, 172, 254, 0.08));
    border: 1px solid rgba(102, 126, 234, 0.25);
    border-radius: 24px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    transition: all 0.5s ease;
    backdrop-filter: blur(10px);
    cursor: pointer;
}

.advanced-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--success));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.advanced-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow: 0 25px 80px rgba(79, 172, 254, 0.25);
    background: rgba(79, 172, 254, 0.1);
}

.advanced-card:hover::before {
    transform: scaleX(1);
}

.advanced-card .adv-num {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    background: rgba(79, 172, 254, 0.15);
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    display: inline-block;
    margin-bottom: 1.25rem;
    letter-spacing: 1.5px;
}

.advanced-card h3 {
    color: var(--text);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    font-weight: 700;
    line-height: 1.4;
}

.advanced-card p {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.advanced-card .adv-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.advanced-card .adv-tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-dim);
    transition: all 0.3s ease;
}

.advanced-card:hover .adv-tag {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(79, 172, 254, 0.3);
}

/* 响应式 */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .course-showcase-header h2 { font-size: 2rem; }
    .advanced-preview-header h2 { font-size: 2rem; }
    .code-container { margin: 0 1rem; }
    .scroll-item { flex: 0 0 280px; }
}