/* ================================
   CIMA - 中華數位影創動能發展協會
   Custom Stylesheet
   ================================ */

/* ========== CSS Variables ========== */
:root {
    /* Colors - Deep Blue Theme with Aurora Accents */
    --primary-blue: #0A1929;
    --secondary-blue: #1A2F46;
    --accent-blue: #2E5C8A;
    --light-blue: #4A90E2;
    --aurora-cyan: #00E5FF;
    --aurora-purple: #9C27B0;
    --aurora-pink: #E91E63;
    --silver: #C0C5CE;
    --silver-light: #E8EAED;
    --white: #FFFFFF;
    --text-dark: #1A1A1A;
    --text-gray: #666666;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0A1929 0%, #1A2F46 50%, #2E5C8A 100%);
    --gradient-aurora: linear-gradient(135deg, #00E5FF 0%, #9C27B0 50%, #E91E63 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(10, 25, 41, 0.9) 0%, rgba(46, 92, 138, 0.7) 100%);
    
    /* Typography */
    --font-primary: 'Noto Sans TC', 'Inter', -apple-system, sans-serif;
    --font-display: 'Noto Sans TC', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px rgba(0, 229, 255, 0.3);
}

/* ========== Reset & Base Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

/* ========== Navigation ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 25, 41, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 25, 41, 0.98);
    box-shadow: 0 2px 30px rgba(0, 229, 255, 0.2);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--white);
}

.logo-img {
    height: 50px;
    width: auto;
    object-fit: contain;
    transition: var(--transition-normal);
    /* 去背效果 - 使用混合模式讓白色背景消失 */
    mix-blend-mode: screen;
    /* 或使用 filter 移除白色背景 */
    filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.3));
}

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

.logo i {
    font-size: 2rem;
    background: var(--gradient-aurora);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--silver-light);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--aurora-cyan);
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--white);
    transition: var(--transition-normal);
}

/* ========== Hero Section ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--gradient-primary);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-overlay);
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    text-align: center;
    color: var(--white);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    background: var(--gradient-aurora);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--silver-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-aurora);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--silver);
    font-size: 1rem;
    font-weight: 500;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-aurora);
    color: var(--white);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(0, 229, 255, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--silver);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--aurora-cyan);
    color: var(--aurora-cyan);
}

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--silver);
    border-radius: 15px;
    display: flex;
    justify-content: center;
    padding-top: 10px;
}

.wheel {
    width: 4px;
    height: 10px;
    background: var(--aurora-cyan);
    border-radius: 2px;
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 0; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(10px); }
}

/* ========== Section Styles ========== */
section {
    padding: var(--spacing-xl) 0;
}

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

.section-tag {
    display: inline-block;
    color: var(--aurora-cyan);
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
}

/* ========== About Section ========== */
.about {
    background: linear-gradient(180deg, var(--white) 0%, #F5F7FA 100%);
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.vision-card,
.structure-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.vision-card:hover,
.structure-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.vision-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-aurora);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.vision-card h3,
.structure-card h3 {
    font-size: 1.8rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.vision-card p {
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.highlight-text {
    color: var(--accent-blue);
    font-weight: 600;
    padding: var(--spacing-sm);
    background: rgba(0, 229, 255, 0.05);
    border-left: 4px solid var(--aurora-cyan);
    border-radius: 5px;
}

.structure-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(0, 229, 255, 0.05);
    border-radius: 10px;
    margin-bottom: var(--spacing-md);
}

.structure-role {
    font-weight: 700;
    color: var(--accent-blue);
}

.structure-name {
    font-size: 1.1rem;
    color: var(--primary-blue);
    font-weight: 600;
}

.organization-values {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.value-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--silver-light);
    border-radius: 10px;
    font-weight: 600;
    color: var(--primary-blue);
}

.value-item i {
    color: var(--aurora-cyan);
}

.digital-transformation {
    margin-top: var(--spacing-lg);
}

.transformation-card {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-lg);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.transformation-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.transformation-content h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.transformation-content p {
    color: var(--silver-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.trend-highlights {
    display: grid;
    gap: var(--spacing-sm);
}

.trend-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(10px);
}

.trend-item i {
    font-size: 1.5rem;
    color: var(--aurora-cyan);
    flex-shrink: 0;
}

.trend-item strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--white);
}

.trend-item span {
    color: var(--silver-light);
    font-size: 0.9rem;
}

/* ========== Services Section ========== */
.services {
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.service-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    border: 2px solid transparent;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: var(--gradient-aurora);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--aurora-cyan);
}

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-aurora);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.service-card h3 {
    font-size: 1.6rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.service-desc {
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.service-features {
    list-style: none;
    margin-bottom: var(--spacing-sm);
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    color: var(--text-gray);
}

.service-features i {
    color: var(--aurora-cyan);
    font-size: 0.8rem;
}

.service-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(0, 229, 255, 0.1);
    color: var(--aurora-cyan);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

.services-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.services-cta p {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
}

/* ========== Events Section ========== */
.events {
    background: linear-gradient(180deg, #F5F7FA 0%, var(--white) 100%);
}

.event-featured {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
}

.event-image {
    position: relative;
    background: var(--gradient-primary);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.event-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background: var(--gradient-aurora);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.85rem;
    z-index: 2;
}

.event-overlay {
    font-size: 5rem;
    color: rgba(255, 255, 255, 0.2);
}

.event-content {
    padding: var(--spacing-lg);
}

.event-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.event-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--silver-light);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-gray);
}

.event-meta i {
    color: var(--aurora-cyan);
}

.event-title {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.event-description {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.event-highlights {
    display: flex;
    gap: var(--spacing-md);
    justify-content: space-around;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md) 0;
    border-top: 2px solid var(--silver-light);
    border-bottom: 2px solid var(--silver-light);
}

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

.highlight-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-aurora);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.highlight-label {
    color: var(--text-gray);
    font-size: 0.9rem;
}

.event-impact {
    background: rgba(0, 229, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: 15px;
    margin-top: var(--spacing-md);
}

.event-impact h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.event-impact i {
    color: var(--aurora-cyan);
}

.event-impact ul {
    list-style: none;
    padding-left: 0;
}

.event-impact li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-gray);
    line-height: 1.7;
}

.event-impact li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--aurora-cyan);
}

.timeline-title {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-aurora);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-marker {
    width: 20px;
    height: 20px;
    background: var(--gradient-aurora);
    border-radius: 50%;
    border: 4px solid var(--white);
    box-shadow: var(--shadow-glow);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.timeline-content {
    width: calc(50% - 40px);
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: 15px;
    box-shadow: var(--shadow-md);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: auto;
    margin-left: 40px;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
    margin-right: 40px;
}

.timeline-year {
    font-size: 1.5rem;
    font-weight: 900;
    background: var(--gradient-aurora);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

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

.timeline-content p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* ========== Contact Section ========== */
.contact {
    background: linear-gradient(180deg, var(--white) 0%, #F5F7FA 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.info-card,
.form-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.info-card h3,
.form-card h3 {
    font-size: 1.8rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.info-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--silver-light);
}

.info-item:last-of-type {
    border-bottom: none;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--aurora-cyan);
    width: 30px;
    flex-shrink: 0;
}

.info-item strong {
    display: block;
    color: var(--primary-blue);
    margin-bottom: 0.25rem;
}

.info-item a {
    color: var(--accent-blue);
}

.info-item a:hover {
    color: var(--aurora-cyan);
}

.info-item span {
    color: var(--text-gray);
}

.social-links {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--silver-light);
}

.social-links h4 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.social-icons {
    display: flex;
    gap: var(--spacing-sm);
}

.social-icons a {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--silver-light);
    border-radius: 50%;
    color: var(--primary-blue);
    font-size: 1.3rem;
    transition: var(--transition-normal);
}

.social-icons a:hover {
    background: var(--gradient-aurora);
    color: var(--white);
    transform: translateY(-3px);
}

.social-icons a.social-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.social-icons a.social-disabled:hover {
    background: var(--silver-light);
    color: var(--primary-blue);
    transform: translateY(0);
}

.form-intro {
    color: var(--text-gray);
    margin-bottom: var(--spacing-md);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--primary-blue);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem 1rem;
    border: 2px solid var(--silver-light);
    border-radius: 10px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--aurora-cyan);
    box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.join-benefits {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.join-benefits h3 {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.benefit-item {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(0, 229, 255, 0.05);
    border-radius: 15px;
    transition: var(--transition-normal);
}

.benefit-item:hover {
    background: rgba(0, 229, 255, 0.1);
    transform: translateY(-5px);
}

.benefit-item i {
    font-size: 2.5rem;
    color: var(--aurora-cyan);
    margin-bottom: var(--spacing-sm);
}

.benefit-item h4 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.benefit-item p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* ========== Footer ========== */
.footer {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.8rem;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.footer-logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
    transition: var(--transition-normal);
    /* 去背效果 - 使用混合模式讓白色背景消失 */
    mix-blend-mode: screen;
    /* 增加發光效果 */
    filter: brightness(1.2) drop-shadow(0 0 10px rgba(0, 229, 255, 0.4));
}

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

.footer-logo i {
    font-size: 2rem;
    color: var(--aurora-cyan);
}

.footer-tagline {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.footer-desc {
    color: var(--silver);
}

.footer-col h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: var(--silver-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-col a:hover {
    color: var(--aurora-cyan);
}

.footer-col a.social-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.footer-col a.social-disabled:hover {
    color: var(--silver-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--silver);
}

.footer-credit {
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.footer-credit i {
    color: var(--aurora-pink);
}

/* ========== Back to Top Button ========== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-aurora);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

/* ========== Responsive Design ========== */
@media (max-width: 768px) {
    .logo-img {
        height: 40px;
    }
    
    .footer-logo-img {
        height: 50px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(10, 25, 41, 0.98);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        transform: translateX(-100%);
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-menu li {
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .timeline::before {
        left: 0;
    }
    
    .timeline-marker {
        left: 0;
        transform: translateX(0);
    }
    
    .timeline-item,
    .timeline-item:nth-child(odd) {
        flex-direction: row;
    }
    
    .timeline-content,
    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        width: calc(100% - 40px);
        margin-left: 40px;
        margin-right: 0;
    }
    
    .event-highlights {
        flex-direction: column;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .logo-img {
        height: 35px;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    .footer-logo-img {
        height: 45px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .organization-values {
        grid-template-columns: 1fr;
    }
}