/* ===== CSS Variables ===== */
:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fafafa;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --accent-blue: #0071e3;
    --accent-blue-hover: #0051b3;
    --accent-red: #d70015;
    --border-color: #d2d2d7;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-fast: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
}

[data-theme="dark"] {
    /* Dark Theme */
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #2d2d2f;
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --accent-blue: #0071e3;
    --accent-blue-hover: #0051b3;
    --accent-red: #ff3b30;
    --border-color: #424245;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.6), 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.7), 0 10px 10px rgba(0, 0, 0, 0.6);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "kern" 1;
    text-rendering: optimizeLegibility;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition-fast);
    will-change: background-color, backdrop-filter;
}

[data-theme="dark"] .navbar {
    background-color: rgba(0, 0, 0, 0.72);
    border-bottom: 0.5px solid rgba(255, 255, 255, 0.1);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.8);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .navbar.scrolled {
    background-color: rgba(0, 0, 0, 0.85);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: var(--spacing-lg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
    flex: 1;
    justify-content: center;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.nav-menu::-webkit-scrollbar {
    display: none;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 400;
    font-size: 15px;
    letter-spacing: -0.011em;
    transition: var(--transition-fast);
    position: relative;
    padding: var(--spacing-sm) var(--spacing-xs);
    white-space: nowrap;
    display: inline-block;
    line-height: 1.2;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--accent-blue);
    transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border-radius: 2px;
}

.nav-link:hover {
    color: var(--accent-blue);
    transform: translateY(-1px);
}

.nav-link:hover::after {
    width: calc(100% - 8px);
}

.nav-link.active {
    color: var(--accent-blue);
    font-weight: 500;
}

.nav-link.active::after {
    width: calc(100% - 8px);
}

.nav-link:active {
    transform: translateY(0);
    opacity: 0.8;
}

.admin-link {
    font-weight: 600;
    color: var(--accent-blue);
}

.header-social-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-left: var(--spacing-sm);
}

.header-social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    background-color: transparent;
    position: relative;
}

.header-social-link::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    opacity: 0;
    transition: var(--transition-fast);
    transform: scale(0.8);
}

.header-social-link:hover::before {
    opacity: 1;
    transform: scale(1);
}

.header-social-link:hover {
    color: var(--accent-blue);
    transform: translateY(-1px);
}

.header-social-link svg {
    position: relative;
    z-index: 1;
}

.header-social-link svg {
    width: 20px;
    height: 20px;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: var(--transition-fast);
    margin-left: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    opacity: 0;
    transition: var(--transition-fast);
    transform: scale(0.8);
}

.theme-toggle:hover::before {
    opacity: 1;
    transform: scale(1);
}

.theme-toggle:hover {
    transform: rotate(15deg) scale(1.05);
}

.theme-toggle .theme-icon {
    position: relative;
    z-index: 1;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
    perspective: 1000px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0, 113, 227, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: -1;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 113, 227, 0.05) 0%, transparent 70%);
    animation: pulse 12s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.05); opacity: 0.5; }
}

.hero-content {
    max-width: 800px;
    z-index: 1;
    animation: heroFadeIn 1s ease-out;
    transform-style: preserve-3d;
    will-change: transform;
    position: relative;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.hero-logo {
    margin-bottom: 32px;
    display: flex;
    justify-content: center;
    animation: fadeIn 1.2s ease-out;
    transform-style: preserve-3d;
    will-change: transform;
}

.hero-logo-img {
    max-width: 320px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.06));
    transition: var(--transition-slow);
    will-change: transform, filter;
}

.hero-logo-img:hover {
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.1));
    transform: scale(1.02) translateY(-2px);
}

.hero-logo-img.logo-light {
    display: block;
}

.hero-logo-img.logo-dark {
    display: none;
}

[data-theme="dark"] .hero-logo-img.logo-light {
    display: none;
}

[data-theme="dark"] .hero-logo-img.logo-dark {
    display: block;
}

.hero-title {
    font-size: clamp(36px, 6vw, 72px);
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.6s both;
    margin-top: 8px;
}

.btn {
    padding: 12px 28px;
    border-radius: 22px;
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    letter-spacing: -0.01em;
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: white;
    box-shadow: 0 1px 3px rgba(0, 113, 227, 0.2), 0 1px 2px rgba(0, 113, 227, 0.15);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition-fast);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 113, 227, 0.35), 0 2px 4px rgba(0, 113, 227, 0.2);
    background-color: var(--accent-blue-hover);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 113, 227, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(0, 113, 227, 0.05);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:active {
    transform: translateY(0);
    box-shadow: none;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-secondary);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s infinite;
}

@keyframes scroll {
    0% { opacity: 1; top: 8px; }
    100% { opacity: 0; top: 20px; }
}

/* ===== Sections ===== */
.section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.section:last-child::after {
    display: none;
}

.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: var(--spacing-3xl) 0;
    border: none;
    width: 60px;
    margin-left: auto;
    margin-right: auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.8s ease-out;
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.section-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    letter-spacing: -0.01em;
    line-height: 1.5;
    font-weight: 400;
}

/* ===== About Section ===== */
.about-section {
    background-color: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.75;
    letter-spacing: -0.01em;
    font-weight: 400;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 100%;
    max-width: 420px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    border: 0.5px solid var(--border-color);
    transition: var(--transition);
}

.image-placeholder:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.about-logo {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 4px 16px rgba(0, 0, 0, 0.1));
}

/* ===== Activities Section ===== */
.activity-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-md);
}

.activity-tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-family: inherit;
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.activity-tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--accent-blue);
    transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border-radius: 2px;
}

.activity-tab-btn:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.activity-tab-btn.active {
    color: var(--accent-blue);
    background-color: var(--bg-secondary);
}

.activity-tab-btn.active::after {
    width: calc(100% - 24px);
}

.activity-badge {
    background-color: var(--accent-red);
    color: white;
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
    animation: pulse-badge 2s infinite;
}

@keyframes pulse-badge {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

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

.activity-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 0.5px solid var(--border-color);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    perspective: 1000px;
    will-change: transform;
}

.activity-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.03) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.activity-card:hover {
    transform: translateY(-12px) rotateX(2deg);
    box-shadow: var(--shadow-xl);
    border-color: rgba(0, 113, 227, 0.3);
    background-color: var(--bg-primary);
}

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

.activity-card.upcoming {
    border-color: var(--accent-red);
    border-width: 2px;
}

.upcoming-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: linear-gradient(135deg, var(--accent-red) 0%, #b3000f 100%);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(215, 0, 21, 0.3);
    animation: pulse-badge 2s ease-in-out infinite;
}

.activity-icon {
    font-size: 48px;
    margin-bottom: 24px;
}

.activity-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.activity-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    letter-spacing: -0.01em;
}

.activity-card .activity-date-preview {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.activity-date-main {
    font-size: 15px;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 8px;
}

.activity-detail-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    text-align: left;
}

.activity-detail-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== Gallery Section ===== */
.gallery-section {
    background-color: var(--bg-secondary);
}

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

.gallery-item {
    aspect-ratio: 4/3;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 0.5px solid var(--border-color);
    background-color: var(--bg-secondary);
    position: relative;
}

.gallery-item:hover {
    transform: scale(1.02) translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(0, 113, 227, 0.3);
    z-index: 10;
}

.gallery-item img {
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
    opacity: 0;
}

.gallery-item img.loaded {
    opacity: 1;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 18px;
    border: 1px solid var(--border-color);
}

/* ===== Contact Section ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    transition: var(--transition-fast);
}

.contact-item:hover {
    background-color: var(--bg-tertiary);
    transform: translateX(4px);
}

.contact-icon {
    font-size: 32px;
    flex-shrink: 0;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.contact-item:hover .contact-icon {
    opacity: 1;
    transform: scale(1.1);
}

.contact-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.contact-item p {
    font-size: 15px;
    color: var(--text-secondary);
    letter-spacing: -0.01em;
    line-height: 1.5;
}

.social-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    border: 0.5px solid var(--border-color);
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background-color: var(--accent-blue);
    opacity: 0;
    transition: var(--transition-fast);
    transform: scale(0.9);
}

.social-link svg {
    width: 20px;
    height: 20px;
    transition: var(--transition-fast);
    position: relative;
    z-index: 1;
}

.social-link span {
    position: relative;
    z-index: 1;
}

.social-link:hover {
    color: white;
    border-color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.social-link:hover::before {
    opacity: 1;
    transform: scale(1);
}

.social-link:hover svg {
    fill: white;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 15px;
    transition: var(--transition-fast);
    letter-spacing: -0.01em;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.08);
    background-color: var(--bg-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

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

/* ===== Magazine Sticker ===== */
.magazine-sticker {
    position: fixed;
    top: 80px;
    right: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 0.5px solid rgba(0, 0, 0, 0.1);
    z-index: 999;
    max-width: 300px;
    animation: slideInRight 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transition: var(--transition);
    will-change: transform, opacity;
}

[data-theme="dark"] .magazine-sticker {
    background: rgba(29, 29, 31, 0.85);
    border-color: rgba(255, 255, 255, 0.1);
}

.magazine-sticker.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateX(120%);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(120%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.sticker-close {
    position: absolute;
    top: 6px;
    right: 6px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    padding: 0;
}

.sticker-close:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.sticker-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.sticker-icon {
    font-size: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.sticker-text {
    flex: 1;
    min-width: 0;
}

.sticker-title {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 3px;
    line-height: 1.4;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.sticker-subtitle {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.chess-sticker {
    top: 180px !important;
}

.chess-sticker .sticker-link {
    margin-top: 12px;
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent-blue);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-fast);
}

.chess-sticker .sticker-link:hover {
    background: var(--accent-blue-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    display: none !important;
}

/* ===== Projects Section ===== */
.projects-section {
    padding: 120px 0;
}

.projects-category {
    margin-bottom: 60px;
}

.category-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.category-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    letter-spacing: -0.01em;
}

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

.project-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-blue), rgba(0, 113, 227, 0.3));
    transform: scaleX(0);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform-origin: left;
}

.project-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.02) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

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

.project-card:hover::after {
    opacity: 1;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-blue);
    background-color: var(--bg-primary);
}

.project-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
    transition: var(--transition);
}

.project-card:hover .project-icon {
    transform: scale(1.1);
}

.project-card h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.project-subtitle {
    font-size: 14px;
    color: var(--accent-blue);
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.project-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.project-link {
    font-size: 14px;
    color: var(--accent-blue);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
    letter-spacing: -0.01em;
}

.project-card:hover .project-link {
    gap: 8px;
}

/* ===== Subscription Section ===== */
.subscription-section {
    padding: 120px 0;
}

.subscription-header {
    text-align: center;
    margin-bottom: 60px;
}


.subscription-content {
    max-width: 900px;
    margin: 0 auto;
}

.subscription-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.info-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border-color);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-blue);
}

.info-icon {
    font-size: 32px;
    margin-bottom: 16px;
    display: block;
}

.info-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

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

.info-list li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    line-height: 1.6;
    letter-spacing: -0.01em;
}

.info-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: 600;
}

.subscription-form-container {
    background-color: var(--bg-secondary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    border: 0.5px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.form-header {
    margin-bottom: 32px;
    text-align: center;
}

.form-header h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.form-header p {
    font-size: 15px;
    color: var(--text-secondary);
    letter-spacing: -0.01em;
}

.subscription-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.subscription-form .form-group {
    display: flex;
    flex-direction: column;
}

.subscription-form label {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.required {
    color: var(--accent-red);
}

.subscription-form input,
.subscription-form select,
.subscription-form textarea {
    padding: 12px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
    letter-spacing: -0.01em;
}

.subscription-form input:focus,
.subscription-form select:focus,
.subscription-form textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.subscription-form textarea {
    resize: vertical;
    min-height: 100px;
}

.checkbox-group {
    margin-top: 8px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    letter-spacing: -0.01em;
}

.checkbox-label input[type="checkbox"] {
    margin: 0;
    width: 18px;
    height: 18px;
    cursor: pointer;
    flex-shrink: 0;
    margin-top: 2px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-large svg {
    transition: var(--transition);
}

.btn-large:hover svg {
    transform: translateX(4px);
}

@media (max-width: 640px) {
    .subscription-form-container {
        padding: 24px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .subscription-info-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Quick Links Section ===== */
.quick-links-section {
    padding: 120px 0;
}

.quick-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.quick-link-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 0.5px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    perspective: 1000px;
    will-change: transform;
}

.quick-link-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.03) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.quick-link-card:hover {
    transform: translateY(-12px) rotateX(2deg);
    box-shadow: var(--shadow-xl);
    border-color: rgba(0, 113, 227, 0.3);
    background-color: var(--bg-primary);
}

.quick-link-card:hover::before {
    opacity: 1;
}

.quick-link-icon {
    font-size: 36px;
    margin-bottom: 20px;
    display: block;
    transition: var(--transition);
}

.quick-link-card:hover .quick-link-icon {
    transform: scale(1.15) rotateY(5deg);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.quick-link-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.quick-link-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    letter-spacing: -0.01em;
    font-weight: 400;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-2xl) 0;
    border-top: 0.5px solid var(--border-color);
    margin-top: var(--spacing-3xl);
}

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

.footer-logo {
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: center;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.footer-logo:hover {
    opacity: 1;
    transform: scale(1.02);
}

.footer-logo-img {
    max-width: 200px;
    height: auto;
}

.footer-logo-img.logo-light {
    display: block;
}

.footer-logo-img.logo-dark {
    display: none;
}

[data-theme="dark"] .footer-logo-img.logo-light {
    display: none;
}

[data-theme="dark"] .footer-logo-img.logo-dark {
    display: block;
}

.footer-text {
    color: var(--text-secondary);
    font-size: 13px;
    letter-spacing: -0.01em;
    font-weight: 400;
}

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .nav-menu {
        gap: var(--spacing-md);
    }
    
    .nav-link {
        font-size: 14px;
    }
    
    .search-container input {
        width: 160px;
    }
}

@media (max-width: 968px) {
    .nav-container {
        justify-content: space-between;
        height: 64px;
        padding: 0 var(--spacing-lg);
    }
    
    .header-social-links {
        display: none;
    }
    
    .search-container {
        display: none;
    }
    
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        transform: translateX(-100%);
        transition: var(--transition);
        border-bottom: 1px solid var(--border-color);
        margin: 0;
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-link {
        font-size: 16px;
        padding: var(--spacing-sm) 0;
        white-space: normal;
        width: 100%;
        text-align: left;
    }

    .hamburger {
        display: flex;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .activities-grid {
        grid-template-columns: 1fr;
    }
    
    .activity-tabs {
        flex-direction: column;
        align-items: stretch;
    }
    
    .activity-tab-btn {
        width: 100%;
        justify-content: space-between;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 640px) {
    .hero {
        padding: 100px var(--spacing-md) 60px;
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
    
    .magazine-sticker {
        top: auto;
        bottom: var(--spacing-lg);
        right: var(--spacing-md);
        left: auto;
        max-width: calc(100% - var(--spacing-xl));
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .sticker-title {
        font-size: 12px;
    }
    
    .sticker-subtitle {
        font-size: 10px;
    }
    
    .sticker-icon {
        font-size: 18px;
    }
    
    .breadcrumb {
        padding: 80px 0 0;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Smooth scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: opacity, transform;
}

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

/* Past event styling */
.activity-card.past-event {
    opacity: 0.7;
    filter: grayscale(0.2);
}

.activity-card.past-event:hover {
    opacity: 0.9;
    filter: grayscale(0);
}

.activity-registration-form {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border-color);
}

.activity-registration-form h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.activity-registration-form .form-group {
    margin-bottom: var(--spacing-md);
}

.activity-registration-form label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.activity-registration-form input,
.activity-registration-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 0.5px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 15px;
    transition: var(--transition-fast);
}

.activity-registration-form input:focus,
.activity-registration-form textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.activity-live-stream {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border-color);
}

.activity-live-stream h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.live-stream-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-md);
}

.live-stream-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.announcement-banner {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--accent-blue);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.announcement-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
}

.announcement-banner button {
    background: transparent;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.announcement-banner button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.announcement-popup {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.popup-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-xl);
}

.popup-content h3 {
    margin-bottom: var(--spacing-md);
    font-size: 24px;
    font-weight: 600;
}

.popup-content button {
    margin-top: var(--spacing-lg);
    width: 100%;
}

.search-container {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 0.5px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    z-index: 100;
}

.search-result-item {
    padding: var(--spacing-md);
    border-bottom: 0.5px solid var(--border-color);
    transition: var(--transition-fast);
}

.search-result-item:hover {
    background: var(--bg-secondary);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item h4 {
    margin-bottom: var(--spacing-xs);
    font-size: 16px;
    font-weight: 600;
}

.search-result-item a {
    color: var(--accent-blue);
    text-decoration: none;
}

.search-result-item p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.social-post {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 0.5px solid var(--border-color);
    transition: var(--transition);
}

.social-post:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.social-post img {
    width: 100%;
    height: auto;
    display: block;
}

.social-post p {
    padding: var(--spacing-md);
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.social-post a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.comment-item {
    padding: var(--spacing-md);
    border-bottom: 0.5px solid var(--border-color);
}

.comment-item:last-child {
    border-bottom: none;
}

.comment-author {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: 14px;
}

.comment-date {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.comment-text {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
}

.video-gallery-item {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
}

.video-gallery-item::before {
    content: '▶';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 48px;
    color: white;
    z-index: 2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.video-gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.campaign-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 0.5px solid var(--border-color);
    margin-bottom: var(--spacing-md);
}

.campaign-item h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 20px;
    font-weight: 600;
}

.campaign-signature-count {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-blue);
    margin: var(--spacing-md) 0;
}

.calendar-view {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 0.5px solid var(--border-color);
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: 16px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-xs);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: var(--transition-fast);
}

.calendar-day.has-event {
    background: var(--accent-blue);
    color: white;
    font-weight: 600;
}

.calendar-day.has-event:hover {
    background: var(--accent-blue-hover);
}

@media (max-width: 768px) {
    .activity-registration-form,
    .activity-live-stream {
        padding: var(--spacing-md);
    }
    
    .popup-content {
        padding: var(--spacing-lg);
    }
    
    .calendar-header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .calendar-header h2 {
        font-size: 24px;
    }
    
    .calendar-grid {
        gap: 2px;
    }
    
    .calendar-day {
        font-size: 12px;
        padding: 8px 4px;
        min-height: 40px;
    }
    
    .calendar-day-header {
        font-size: 11px;
        padding: 6px 4px;
    }
}

/* ===== Gelişmiş Görsel Sunum ve Animasyonlar ===== */

/* Mikro-animasyonlar */
.btn {
    position: relative;
    overflow: hidden;
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.95);
    transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link {
    position: relative;
    transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-blue);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Parallax scrolling */
.hero {
    position: relative;
    overflow: hidden;
    perspective: 1000px;
}

.hero-content {
    transform-style: preserve-3d;
    will-change: transform;
}

.hero-logo {
    transform-style: preserve-3d;
    will-change: transform;
}

/* Gradient overlays */
.activity-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.05) 0%, rgba(0, 113, 227, 0.15) 100%);
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    border-radius: var(--radius-lg);
}

.activity-card:hover::after {
    opacity: 1;
}

.quick-link-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.08) 0%, rgba(0, 113, 227, 0.2) 100%);
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    border-radius: var(--radius-lg);
}

.quick-link-card:hover::after {
    opacity: 1;
}

/* Glassmorphism iyileştirmeleri */
.navbar {
    backdrop-filter: saturate(180%) blur(30px);
    -webkit-backdrop-filter: saturate(180%) blur(30px);
    background-color: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] .navbar {
    background-color: rgba(0, 0, 0, 0.8);
}

.magazine-sticker {
    backdrop-filter: saturate(180%) blur(40px);
    -webkit-backdrop-filter: saturate(180%) blur(40px);
    background-color: rgba(255, 255, 255, 0.85);
}

[data-theme="dark"] .magazine-sticker {
    background-color: rgba(0, 0, 0, 0.85);
}

/* Görsel galeri lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    transform: scale(0.8);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.lightbox.active .lightbox-content {
    transform: scale(1);
}

.lightbox img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10001;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10001;
}

.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1);
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

.gallery-item {
    cursor: pointer;
}

/* Loading states - Skeleton screens */
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-card {
    height: 300px;
    margin-bottom: var(--spacing-lg);
}

.skeleton-text {
    height: 16px;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.skeleton-text:last-child {
    width: 60%;
}

.page-loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease, visibility 0.5s;
    pointer-events: none;
}

.page-loading.hidden,
.page-loading[style*="display: none"] {
    opacity: 0;
    visibility: hidden;
    display: none !important;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Smooth page transitions */
body {
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 9998;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-transition.active {
    transform: translateX(0);
}

/* 3D card effects */
.activity-card,
.quick-link-card,
.news-card {
    transform-style: preserve-3d;
    perspective: 1000px;
    will-change: transform;
}

.activity-card:hover,
.quick-link-card:hover,
.news-card:hover {
    transform: translateY(-8px) rotateX(2deg);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Image lazy loading animations */
img[data-src] {
    opacity: 0;
    transition: opacity 0.5s ease;
}

img[data-src].loaded {
    opacity: 1;
}

img[data-src]::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-secondary);
    border-radius: inherit;
    z-index: -1;
}

/* Interactive elements feedback */
input:focus,
textarea:focus,
select:focus {
    transform: scale(1.01);
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible),
select:focus:not(:focus-visible) {
    transform: scale(1);
}

.checkbox:checked + label::before {
    transform: scale(1.1);
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Premium İçerik Sunumu ve Kullanıcı Deneyimi ===== */

/* Typography hierarchy */
h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: clamp(24px, 4vw, 40px);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(20px, 3vw, 28px);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-sm);
}

p {
    font-size: clamp(15px, 2vw, 17px);
    line-height: 1.7;
    letter-spacing: -0.01em;
}

/* Content cards redesign */
.activity-card,
.news-card {
    background: var(--bg-secondary);
    border: 0.5px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

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

.activity-card:hover::before,
.news-card:hover::before {
    transform: scaleX(1);
}

/* Hero section enhancement */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0, 113, 227, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    animation: heroFadeIn 1s ease-out;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section dividers */
.section {
    position: relative;
}

.section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.section:last-child::after {
    display: none;
}

.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: var(--spacing-3xl) 0;
    border: none;
}

/* Color accent system */
.accent-highlight {
    color: var(--accent-blue);
    font-weight: 600;
}

.accent-badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-hover));
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* Icon system */
.icon {
    width: 24px;
    height: 24px;
    display: inline-block;
    vertical-align: middle;
    fill: currentColor;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.icon:hover {
    transform: scale(1.1);
}

/* Form design polish */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

input,
textarea,
select {
    width: 100%;
    padding: 14px 18px;
    border: 0.5px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: -0.01em;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
    transform: translateY(-1px);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-validation {
    margin-top: var(--spacing-xs);
    font-size: 13px;
    color: var(--accent-red);
    display: none;
}

.form-validation.show {
    display: block;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-success {
    padding: var(--spacing-md);
    background: rgba(0, 113, 227, 0.1);
    border-left: 4px solid var(--accent-blue);
    border-radius: var(--radius-sm);
    color: var(--accent-blue);
    margin-top: var(--spacing-md);
    display: none;
}

.form-success.show {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile experience */
@media (max-width: 768px) {
    .activity-card,
    .quick-link-card,
    .news-card {
        padding: var(--spacing-lg);
    }
    
    .activity-card:hover,
    .quick-link-card:hover,
    .news-card:hover {
        transform: translateY(-4px);
    }
    
    .btn {
        padding: 14px 24px;
        font-size: 15px;
    }
    
    .hero {
        min-height: 80vh;
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

/* Dark mode refinements */
[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #2d2d2f;
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --border-color: #424245;
}

[data-theme="dark"] .activity-card,
[data-theme="dark"] .news-card {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .activity-card:hover,
[data-theme="dark"] .news-card:hover {
    background: var(--bg-tertiary);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
    background: var(--bg-tertiary);
}

/* Content preview cards */
.content-preview-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
    background: var(--bg-secondary);
    border: 0.5px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.content-preview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.3) 100%);
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
}

.content-preview-card:hover::before {
    opacity: 1;
}

.content-preview-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.content-preview-card:hover img {
    transform: scale(1.1);
}

.content-preview-card-content {
    padding: var(--spacing-lg);
    position: relative;
    z-index: 2;
}

/* Calendar day header */
.calendar-day-header {
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    text-align: center;
}

/* News card enhancements */
.news-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.news-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.news-meta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.news-category {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent-blue);
}

/* Smooth scroll improvements */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}