/**
 * About Page Styles
 * 關於頁面樣式
 */

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    margin-bottom: 3rem;
    border-radius: 0 0 24px 24px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 0.6s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    opacity: 0.95;
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.hero-description {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    line-height: 1.6;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ===== Section Titles ===== */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* ===== Features Section ===== */
.features {
    padding: 3rem 0;
}

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

.feature-card {
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid #e0e7ff;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.12);
    border-color: #c7d2fe;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #667eea;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: #4a5568;
    line-height: 1.6;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

/* ===== Technology Stack Section ===== */
.tech-stack {
    padding: 3rem 0;
    background: linear-gradient(135deg, #faf5ff 0%, #f3f4f6 100%);
    margin: 3rem 0;
    border-radius: 24px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.tech-category {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid #e9d5ff;
    transition: all 0.3s ease;
}

.tech-category:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(139, 92, 246, 0.1);
}

.tech-category h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #8b5cf6;
}

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

.tech-tag {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.tech-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

/* ===== Architecture Section ===== */
.architecture {
    padding: 3rem 0;
}

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

.architecture-card {
    background: linear-gradient(135deg, #fff7ed 0%, #ffffff 100%);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid #fed7aa;
    border-left: 4px solid #f59e0b;
    transition: all 0.3s ease;
}

.architecture-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 32px rgba(245, 158, 11, 0.1);
    border-left-width: 6px;
}

.architecture-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #f59e0b;
}

.architecture-card p {
    color: #4a5568;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.architecture-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.architecture-card li {
    padding: 0.5rem 0;
    color: #4a5568;
    line-height: 1.6;
}

.architecture-card strong {
    color: #667eea;
    font-weight: 600;
}

/* ===== Timeline Section ===== */
.timeline {
    padding: 3rem 0;
    background: linear-gradient(135deg, #ecfdf5 0%, #f0fdfa 100%);
    margin: 3rem 0;
    border-radius: 24px;
}

.timeline-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, #10b981 0%, #059669 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: 2rem;
}

.timeline-marker {
    position: absolute;
    left: 13px;
    top: 0;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: 0 0 0 5px #ecfdf5;
}

.timeline-content {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #d1fae5;
    transition: all 0.3s ease;
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 16px rgba(16, 185, 129, 0.1);
}

.timeline-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #059669;
}

.timeline-content p {
    color: #4a5568;
    line-height: 1.6;
    margin: 0;
}

/* ===== Statistics Section ===== */
.statistics {
    padding: 3rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: linear-gradient(135deg, #fef3c7 0%, #ffffff 100%);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    border: 1px solid #fde68a;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(251, 191, 36, 0.15);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-name {
    font-size: 1rem;
    color: #92400e;
    font-weight: 600;
}

/* ===== Contact Section ===== */
.contact {
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.contact-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 16px;
    padding: 3rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.contact-card h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.contact-card p {
    font-size: 1.125rem;
    line-height: 1.8;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto 0.75rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero {
        padding: 3rem 0;
    }

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

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .feature-grid,
    .tech-grid,
    .architecture-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .timeline-container::before {
        left: 20px;
    }

    .timeline-marker {
        left: 4px;
    }

    .timeline-item {
        padding-left: 60px;
    }

    .contact-card {
        padding: 2rem;
    }

    .contact-card h2 {
        font-size: 1.5rem;
    }

    .contact-card p {
        font-size: 1rem;
    }
}

/* ===== Dark Mode Support (移除深色模式支援，保持亮色調設計) ===== */
/* 為了保持整體設計的清新感，移除深色模式支援 */