/* 
 * FutureMind Tech Community - 官網樣式
 * 設計風格：深色科技風，正式專業
 * 適配：電腦與手機端
 */

/* ==================== CSS 變數 ==================== */
:root {
    /* 色彩體系 */
    --bg-primary: #0B1120;
    --bg-secondary: #0F172A;
    --bg-card: rgba(15, 23, 42, 0.7);
    --bg-glass: rgba(15, 23, 42, 0.8);
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --accent-primary: #0EA5E9;
    --accent-secondary: #10B981;
    --accent-tertiary: #6366F1;
    --accent-warn: #F43F5E;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);
    
    /* 間距系統 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* 字體 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    /* 過渡動畫 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 陰影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.3);
    
    /* 圓角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

/* ==================== 重置樣式 ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
    list-style: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ==================== 通用類別 ==================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.desktop-only {
    display: none;
}

@media (min-width: 1024px) {
    .desktop-only {
        display: block;
    }
}

/* 按鈕樣式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #0284C7);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(14, 165, 233, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

/* 區塊標題 */
.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--accent-primary);
    background: rgba(14, 165, 233, 0.1);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

@media (min-width: 768px) {
    .section-title {
        font-size: 2.5rem;
    }
}

.section-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== 導航欄 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    transition: all var(--transition-base);
}

.header.scrolled {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.logo-icon {
    width: 36px;
    height: 36px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-list {
    display: none;
    align-items: center;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .nav-list {
        display: flex;
    }
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.header .btn {
    display: none;
}

@media (min-width: 768px) {
    .header .btn {
        display: inline-flex;
    }
}

/* 移動版選單按鈕 */
.mobile-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
    padding: 8px;
}

@media (min-width: 768px) {
    .mobile-toggle {
        display: none;
    }
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* 行動版選單 */
@media (max-width: 767px) {
    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-glass);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border-color);
        padding: var(--space-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        display: flex;
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .nav-link {
        display: block;
        padding: var(--space-sm);
        border-radius: var(--radius-md);
    }
    
    .nav-link:hover {
        background: rgba(255, 255, 255, 0.05);
    }
}

/* ==================== 首屏區域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

#particles-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center top, rgba(14, 165, 233, 0.15) 0%, transparent 60%);
    z-index: 1;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(8px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-secondary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 3.5rem;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 4rem;
    }
}

.typing-text {
    color: var(--accent-primary);
    display: inline-block;
}

.typing-cursor {
    display: inline-block;
    animation: blink 1s infinite;
}

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

.hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
    .hero-desc {
        font-size: 1.125rem;
    }
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-xl);
}

@media (min-width: 480px) {
    .hero-actions {
        flex-direction: row;
    }
}

.hero-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    justify-content: center;
    padding: var(--space-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
}

@media (min-width: 768px) {
    .hero-stats {
        flex-direction: row;
        align-items: center;
        gap: var(--space-lg);
    }
}

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

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: var(--font-mono);
}

@media (min-width: 768px) {
    .stat-number {
        font-size: 2rem;
    }
}

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

.stat-divider {
    display: none;
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

@media (min-width: 768px) {
    .stat-divider {
        display: block;
    }
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    font-size: 0.75rem;
    z-index: 2;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 2px;
    animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    100% { transform: translateX(-50%) translateY(12px); opacity: 0; }
}

/* ==================== 研究領域 ==================== */
.domains {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
    position: relative;
}

.domains::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-light), transparent);
}

.domain-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

@media (min-width: 640px) {
    .domain-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .domain-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.domain-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    backdrop-filter: blur(8px);
}

.domain-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(14, 165, 233, 0.1);
}

.domain-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
}

.domain-icon svg {
    width: 100%;
    height: 100%;
}

.domain-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.domain-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.domain-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
    background: rgba(14, 165, 233, 0.1);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
}

/* ==================== 專案展示 ==================== */
.projects {
    padding: var(--space-3xl) 0;
}

.project-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .project-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    backdrop-filter: blur(8px);
}

.project-card:hover {
    border-color: var(--accent-secondary);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(16, 185, 129, 0.1);
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.project-language {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.language-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.language-dot.python { background: #3572A5; }
.language-dot.rust { background: #DEA584; }
.language-dot.go { background: #00ADD8; }
.language-dot.solidity { background: #AA6746; }
.language-dot.csharp { background: #178600; }

.project-stars {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.project-stars svg {
    width: 16px;
    height: 16px;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.project-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.project-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color);
}

.project-update {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.project-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-primary);
}

.project-link:hover {
    text-decoration: underline;
}

.projects-more {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ==================== 關於我們 ==================== */
.about {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2xl);
    }
}

.about-text .section-header {
    text-align: left;
    margin-bottom: var(--space-lg);
}

.about-text .section-desc {
    margin: 0;
}

.about-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.feature-icon {
    width: 20px;
    height: 20px;
    color: var(--accent-secondary);
}

.about-visual {
    display: flex;
    justify-content: center;
}

.code-block {
    width: 100%;
    max-width: 500px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border-color);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dot.red { background: #FF5F56; }
.code-dot.yellow { background: #FFBD2E; }
.code-dot.green { background: #27C93F; }

.code-title {
    margin-left: var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.code-content {
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-keyword { color: #C678DD; }
.code-class { color: #61AFEF; }
.code-function { color: #61AFEF; }
.code-string { color: #98C379; }
.code-comment { color: #5C6370; font-style: italic; }

/* ==================== 聯繫方式 ==================== */
.contact {
    padding: var(--space-3xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 1024px) {
    .contact-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2xl);
    }
}

.contact-info .section-header {
    text-align: left;
    margin-bottom: var(--space-lg);
}

.contact-info .section-desc {
    margin: 0;
}

.contact-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9375rem;
    color: var(--text-secondary);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.contact-icon {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
}

.contact-form-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    backdrop-filter: blur(8px);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

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

/* ==================== 頁腳 ==================== */
.footer {
    padding: var(--space-2xl) 0 var(--space-lg);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr 2fr;
    }
}

.footer-brand {
    max-width: 300px;
}

.footer-tagline {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-top: var(--space-sm);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-column a {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

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

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--accent-primary);
    color: white;
}

.footer-social svg {
    width: 18px;
    height: 18px;
}

.filing-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    font-size: 0.75rem;
}

.filing-info a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.filing-info a:hover {
    color: var(--accent-primary);
}

/* ==================== 動畫效果 ==================== */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos-delay="100"] { transition-delay: 0.1s; }
[data-aos-delay="200"] { transition-delay: 0.2s; }
[data-aos-delay="300"] { transition-delay: 0.3s; }

/* 滾動顯示動畫 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== 響應式調整 ==================== */
@media (max-width: 640px) {
    :root {
        --space-3xl: 4rem;
        --space-2xl: 3rem;
    }
    
    .container {
        padding: 0 var(--space-sm);
    }
}