/* ========================================
   CSS Custom Properties & Variables
   ======================================== */
:root {
    /* Colors inspired by logo */
    --color-primary: #DC371D;
    --color-secondary: #E7680C;
    --color-tertiary: #F29701;
    --color-accent: #FFD14E;

    /* Light mode colors */
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8F9FA;
    --color-bg-elevated: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-muted: #6C757D;
    --color-border: #E0E0E0;
    --color-shadow: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Layout */
    --container-width: 1200px;
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark mode colors */
[data-theme="dark"] {
    --color-bg: #0F1419;
    --color-bg-alt: #1A1F26;
    --color-bg-elevated: #252C35;
    --color-text: #E9ECEF;
    --color-text-muted: #ADB5BD;
    --color-border: #2D3748;
    --color-shadow: rgba(0, 0, 0, 0.3);
}

/* Automatic dark mode based on system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #0F1419;
        --color-bg-alt: #1A1F26;
        --color-bg-elevated: #252C35;
        --color-text: #E9ECEF;
        --color-text-muted: #ADB5BD;
        --color-border: #2D3748;
        --color-shadow: rgba(0, 0, 0, 0.3);
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

ul {
    list-style: none;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ========================================
   Header & Navigation
   ======================================== */
.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    background-color: color-mix(in srgb, var(--color-bg-elevated) 90%, transparent);
}

.navbar {
    padding: var(--spacing-md) 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    height: 40px;
    width: auto;
    color: var(--color-text);
}

.brand-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-base);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-menu a {
    position: relative;
    color: var(--color-text-muted);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.lang-switch:hover {
    background-color: var(--color-bg-alt);
}

.lang-switch .active {
    color: var(--color-primary);
}

.theme-toggle {
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    color: var(--color-text);
    transition: var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--color-bg-alt);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    display: none;
}

.sun-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .sun-icon {
        display: none;
    }

    :root:not([data-theme="light"]) .moon-icon {
        display: block;
    }
}

/* Mobile navigation */
@media (max-width: 767px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg-elevated);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-md);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}

.btn-secondary {
    background-color: var(--color-bg-alt);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-elevated);
    transform: translateY(-2px);
}

.btn-outline {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: white;
}

/* External link icon */
.external-link::after {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    margin-left: 0.4em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'%3E%3C/path%3E%3Cpolyline points='15 3 21 3 21 9'%3E%3C/polyline%3E%3Cline x1='10' y1='14' x2='21' y2='3'%3E%3C/line%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    vertical-align: middle;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-accent) 10%, transparent),
        color-mix(in srgb, var(--color-tertiary) 5%, transparent)
    );
}

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

@media (min-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr 1fr;
    }
}

.edition-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-radius: 100px;
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.edition-badge.previous {
    background: linear-gradient(135deg, var(--color-text-muted), var(--color-border));
}

.hero h1 {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-tertiary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-year {
    font-size: var(--font-size-5xl);
    font-weight: 900;
    line-height: 1;
    color: var(--color-text);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    margin: var(--spacing-md) 0;
}

.hero-info {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-muted);
}

.info-item svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.hero-logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-logo {
    width: 100%;
    max-width: 400px;
    height: auto;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ========================================
   Page Hero
   ======================================== */
.page-hero {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-accent) 10%, transparent),
        color-mix(in srgb, var(--color-tertiary) 5%, transparent)
    );
    text-align: center;
}

.page-hero h1 {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.page-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
}

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

section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.about {
    background-color: var(--color-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

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

.about-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-text p {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    line-height: 1.8;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat-card {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 2px solid var(--color-border);
    transition: var(--transition-base);
}

.stat-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

/* ========================================
   Non-profit Section
   ======================================== */
.nonprofit {
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-primary) 10%, transparent),
        color-mix(in srgb, var(--color-secondary) 5%, transparent)
    );
    padding: var(--spacing-2xl) 0;
}

.nonprofit-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .nonprofit-content {
        grid-template-columns: auto 1fr;
        text-align: left;
    }
}

.nonprofit-icon {
    display: flex;
    justify-content: center;
}

.nonprofit-icon svg {
    width: 64px;
    height: 64px;
    color: var(--color-primary);
}

.nonprofit-text h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.nonprofit-text p {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* ========================================
   Sponsors Section
   ======================================== */
.sponsors-teaser {
    background-color: var(--color-bg-alt);
}

.sponsors-intro {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.sponsor-benefits {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .sponsor-benefits {
        grid-template-columns: repeat(3, 1fr);
    }
}

.benefit-card {
    padding: var(--spacing-xl);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 2px solid var(--color-border);
    transition: var(--transition-base);
}

.benefit-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.benefit-card svg {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
}

.benefit-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.benefit-card p {
    color: var(--color-text-muted);
}

.cta-center {
    text-align: center;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background-color: var(--color-bg);
}

.contact p {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-2xl);
}

.contact-links {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

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

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--color-border);
    transition: var(--transition-base);
    color: var(--color-text);
}

.contact-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.contact-card svg {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

/* ========================================
   Video Section (Previous Edition)
   ======================================== */
.video-section {
    background-color: var(--color-bg);
}

.video-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 12px 40px var(--color-shadow);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-caption {
    text-align: center;
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
}

/* ========================================
   Highlights Grid (Previous Edition)
   ======================================== */
.edition-highlights {
    background-color: var(--color-bg-alt);
}

.highlights-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

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

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

.highlight-card {
    padding: var(--spacing-xl);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 2px solid var(--color-border);
    transition: var(--transition-base);
}

.highlight-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.highlight-icon {
    margin-bottom: var(--spacing-md);
}

.highlight-icon svg {
    width: 48px;
    height: 48px;
    margin: 0 auto;
    color: var(--color-primary);
}

.highlight-number {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-xs);
}

.highlight-label {
    color: var(--color-text-muted);
    font-weight: 600;
}

/* ========================================
   Speakers Section (Previous Edition)
   ======================================== */
.speakers {
    background-color: var(--color-bg);
}

.speakers-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

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

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

.speaker-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: var(--transition-base);
    animation: galleryFadeIn 0.6s ease-out backwards;
}

.speaker-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

/* Stagger animation for speakers */
.speaker-card:nth-child(1) { animation-delay: 0.1s; }
.speaker-card:nth-child(2) { animation-delay: 0.15s; }
.speaker-card:nth-child(3) { animation-delay: 0.2s; }
.speaker-card:nth-child(4) { animation-delay: 0.25s; }
.speaker-card:nth-child(5) { animation-delay: 0.3s; }
.speaker-card:nth-child(6) { animation-delay: 0.35s; }
.speaker-card:nth-child(7) { animation-delay: 0.4s; }
.speaker-card:nth-child(8) { animation-delay: 0.45s; }

.speaker-photo {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: var(--border-radius);
    border: 3px solid var(--color-border);
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-border) 50%, transparent),
        var(--color-border)
    );
    padding: 3px;
    transition: all var(--transition-base);
}

.speaker-card:hover .speaker-photo {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    box-shadow: 0 4px 12px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.speaker-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 3px;
    display: block;
}

.speaker-info {
    text-align: center;
}

.speaker-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.talk-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ========================================
   Photo Gallery (Previous Edition)
   ======================================== */
.photo-gallery {
    background-color: var(--color-bg-alt);
}

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

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

@media (min-width: 1024px) {
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.gallery-item {
    aspect-ratio: 16 / 9;
    border: 3px solid var(--color-border);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-border) 50%, transparent),
        var(--color-border)
    );
    padding: 3px;
    transition: all var(--transition-base);
    animation: galleryFadeIn 0.6s ease-out backwards;
}

.gallery-item:hover {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    box-shadow: 0 4px 20px color-mix(in srgb, var(--color-primary) 40%, transparent),
                0 0 0 1px color-mix(in srgb, var(--color-primary) 20%, transparent);
    transform: translateY(-2px);
}

/* Stagger animation for gallery items */
.gallery-item:nth-child(1) {
    animation-delay: 0.1s;
}

.gallery-item:nth-child(2) {
    animation-delay: 0.2s;
}

.gallery-item:nth-child(3) {
    animation-delay: 0.3s;
}

.gallery-item:nth-child(4) {
    animation-delay: 0.4s;
}

.gallery-item:nth-child(5) {
    animation-delay: 0.5s;
}

.gallery-item:nth-child(6) {
    animation-delay: 0.6s;
}

@keyframes galleryFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 3px;
    transition: transform var(--transition-slow);
    display: block;
}

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

.gallery-placeholder {
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    transition: var(--transition-base);
}

.gallery-placeholder:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-alt);
}

.gallery-placeholder svg {
    width: 48px;
    height: 48px;
}

/* ========================================
   CTA Sections
   ======================================== */
.next-edition-cta,
.sponsor-cta {
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-primary) 10%, transparent),
        color-mix(in srgb, var(--color-secondary) 5%, transparent)
    );
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Sponsorship Packages
   ======================================== */
.why-sponsor {
    background-color: var(--color-bg);
}

.why-sponsor-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

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

.why-card {
    padding: var(--spacing-xl);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--color-border);
    transition: var(--transition-base);
}

.why-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.why-icon {
    margin-bottom: var(--spacing-md);
}

.why-icon svg {
    width: 48px;
    height: 48px;
    color: var(--color-primary);
}

.why-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.why-card p {
    color: var(--color-text-muted);
    line-height: 1.8;
}

.sponsorship-packages {
    background-color: var(--color-bg-alt);
}

.packages-intro {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-2xl);
}

.packages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 1024px) {
    .packages-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.package-card {
    position: relative;
    padding: var(--spacing-xl);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--color-border);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
}

.package-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.package-card.featured {
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.package-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-radius: 100px;
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
}

.package-header {
    text-align: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.package-header h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.package-bronze h3 { color: #CD7F32; }
.package-silver h3 { color: #C0C0C0; }
.package-gold h3 {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.package-platinum h3 { color: #E5E4E2; }

.package-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
}

.price-amount {
    font-size: var(--font-size-3xl);
    font-weight: 900;
}

.price-period {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.package-features {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.package-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.package-features svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.custom-package {
    text-align: center;
    padding: var(--spacing-2xl);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--color-border);
}

.custom-package h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.custom-package p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

/* ========================================
   Previous Sponsors
   ======================================== */
.previous-sponsors {
    background-color: var(--color-bg);
}

.sponsors-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
}

.sponsors-logos {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .sponsors-logos {
        grid-template-columns: repeat(3, 1fr);
    }
}

.sponsor-logo-item {
    aspect-ratio: 16 / 9;
    border: 3px solid var(--color-border);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-border) 50%, transparent),
        var(--color-border)
    );
    padding: 3px;
    transition: all var(--transition-base);
    animation: galleryFadeIn 0.6s ease-out backwards;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sponsor-logo-item:hover {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    box-shadow: 0 4px 20px color-mix(in srgb, var(--color-primary) 40%, transparent),
                0 0 0 1px color-mix(in srgb, var(--color-primary) 20%, transparent);
    transform: translateY(-2px);
}

/* Stagger animation for sponsor logos */
.sponsor-logo-item:nth-child(1) {
    animation-delay: 0.1s;
}

.sponsor-logo-item:nth-child(2) {
    animation-delay: 0.2s;
}

.sponsor-logo-item:nth-child(3) {
    animation-delay: 0.3s;
}

.sponsor-logo-item:nth-child(4) {
    animation-delay: 0.4s;
}

.sponsor-logo-item:nth-child(5) {
    animation-delay: 0.5s;
}

.sponsor-logo-item:nth-child(6) {
    animation-delay: 0.6s;
}

.sponsor-logo-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 3px;
    padding: var(--spacing-md);
    transition: transform var(--transition-slow);
    display: block;
    background-color: var(--color-bg);
}

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

.sponsor-placeholder {
    width: 100%;
    height: 100%;
    background-color: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    transition: var(--transition-base);
}

.sponsor-placeholder:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg);
}

.sponsor-placeholder svg {
    width: 48px;
    height: 48px;
}

/* ========================================
   Footer
   ======================================== */
.main-footer {
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    height: 48px;
    width: auto;
    color: var(--color-text);
}

.footer-brand p {
    color: var(--color-text-muted);
}

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

.footer-col h4 {
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

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

.footer-col a {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}