/* ========================================
   SCALE Workshop - CSS Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Deep teal & coral accent */
    --color-primary: #0d3b4c;
    --color-primary-light: #1a5568;
    --color-accent: #ff6b4a;
    --color-accent-light: #ff8a70;
    --color-accent-dark: #e55a3a;
    --color-bg: #fafbfc;
    --color-bg-alt: #f0f4f7;
    --color-text: #1a2a33;
    --color-text-light: #5a6a73;
    --color-text-muted: #8a9aa3;
    --color-white: #ffffff;
    --color-border: #e0e6ea;
    
    /* Typography */
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Other */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --shadow-sm: 0 2px 8px rgba(13, 59, 76, 0.08);
    --shadow-md: 0 4px 20px rgba(13, 59, 76, 0.12);
    --shadow-lg: 0 8px 40px rgba(13, 59, 76, 0.16);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

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

a:hover {
    color: var(--color-accent-dark);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
}

.nav-menu a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--space-sm) 0;
    position: relative;
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-4xl) var(--space-xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(135deg, rgba(13, 59, 76, 0.85) 0%, rgba(26, 85, 104, 0.75) 50%, rgba(13, 59, 76, 0.85) 100%),
        url('../images/seoul.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center bottom, rgba(255, 107, 74, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: var(--color-white);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: var(--space-xl);
    border: 1px solid rgba(255, 255, 255, 0.25);
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-title {
    margin-bottom: var(--space-xl);
}

.title-accent {
    display: block;
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.03em;
    line-height: 1.1;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.title-main {
    display: block;
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    color: var(--color-text-light);
    margin-top: var(--space-md);
    line-height: 1.5;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

.meta-item span {
    font-size: 1.25rem;
    font-weight: 700;
}

.meta-item svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent-light);
}

.hero-cta {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition);
    animation: fadeInUp 0.8s ease-out 0.5s both;
}

.hero-cta:hover {
    background: var(--color-accent-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-2xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    position: relative;
}

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

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.5; transform: translateX(-50%) translateY(12px); }
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: var(--space-4xl) 0;
}

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

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-3xl);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.title-number {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-accent);
    font-weight: 500;
}

/* ========================================
   About Section
   ======================================== */
.about-lead {
    font-size: 1.25rem;
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: var(--space-3xl);
    max-width: 800px;
}

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

.about-card {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.card-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-white);
}

.about-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.about-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.about-text {
    font-size: 1.1rem;
    color: var(--color-text);
    line-height: 1.8;
    max-width: 800px;
}

.about-text strong {
    color: var(--color-primary);
}

/* ========================================
   Call for Papers Section
   ======================================== */
.cfp-intro {
    font-size: 1.15rem;
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: var(--space-3xl);
    max-width: 800px;
}

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

.track-card {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
    transition: all var(--transition);
}

.track-card.featured {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.track-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.track-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.track-pages {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.track-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Deadlines */
.deadlines {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3xl);
    box-shadow: var(--shadow-sm);
}

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

.deadlines-note {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: var(--space-xl);
}

.deadline-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-lg);
}

.deadline-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent);
}

.deadline-date {
    text-align: center;
    min-width: 70px;
}

.date-day {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
}

.date-month {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.deadline-label {
    font-size: 0.95rem;
    color: var(--color-text);
    font-weight: 500;
}

/* Topics */
.topics {
    margin-bottom: var(--space-3xl);
}

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

.topics-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.topic-category {
    background: var(--color-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.topic-category:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.category-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-accent);
    display: inline-block;
}

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

.category-subtopics li {
    position: relative;
    padding: var(--space-sm) 0 var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.5;
    border-bottom: 1px solid var(--color-border);
}

.category-subtopics li:last-child {
    border-bottom: none;
}

.category-subtopics li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 500;
    font-size: 0.85rem;
}

/* Legacy topic tags (kept for backwards compatibility) */
.topics-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.topic-tag {
    background: var(--color-white);
    color: var(--color-text);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.topic-tag:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Submission Info */
.submission-info {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.submission-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
}

.guidelines-list {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.guidelines-list li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-xl);
    position: relative;
    color: var(--color-text);
    font-size: 0.95rem;
    line-height: 1.6;
}

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

.guidelines-list li strong {
    color: var(--color-primary);
}

.submit-btn {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition);
}

.submit-btn:hover {
    background: var(--color-accent-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Schedule Section
   ======================================== */
.schedule-note {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: var(--color-white);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    margin-bottom: var(--space-2xl);
    display: inline-block;
}

.schedule-list {
    max-width: 800px;
}

.schedule-item {
    display: flex;
    gap: var(--space-xl);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition);
}

.schedule-item:hover {
    background: rgba(255, 107, 74, 0.03);
    margin: 0 calc(-1 * var(--space-md));
    padding-left: var(--space-md);
    padding-right: var(--space-md);
    border-radius: var(--radius-md);
}

.schedule-item.highlight {
    background: rgba(255, 107, 74, 0.05);
    margin: 0 calc(-1 * var(--space-md));
    padding-left: var(--space-md);
    padding-right: var(--space-md);
    border-radius: var(--radius-md);
    border-bottom: none;
}

.schedule-item.break {
    background: var(--color-bg-alt);
    margin: 0 calc(-1 * var(--space-md));
    padding-left: var(--space-md);
    padding-right: var(--space-md);
    border-radius: var(--radius-md);
    border-bottom: none;
}

.schedule-time {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 500;
    min-width: 120px;
    white-space: nowrap;
}

.schedule-event {
    flex: 1;
}

.event-type {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.event-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
}

.event-speaker {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: var(--space-xs);
}

/* ========================================
   Speakers Section
   ======================================== */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

@media (max-width: 900px) {
    .speakers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .speakers-grid {
        grid-template-columns: 1fr;
    }
}

.speaker-card {
    text-align: center;
    transition: all var(--transition);
}

.speaker-card:hover {
    transform: translateY(-4px);
}

.speaker-image {
    width: 160px;
    height: 160px;
    margin: 0 auto var(--space-lg);
    border-radius: 50%;
    overflow: hidden;
    background: var(--color-white);
    box-shadow: var(--shadow-md);
}

.speaker-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.speaker-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

.speaker-placeholder svg {
    width: 60px;
    height: 60px;
    color: rgba(255, 255, 255, 0.5);
}

.speaker-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.speaker-name a {
    color: inherit;
    text-decoration: none;
}

.speaker-name a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.speaker-affiliation {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* ========================================
   Organizers Section
   ======================================== */
.organizers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

@media (max-width: 900px) {
    .organizers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {
    .organizers-grid {
        grid-template-columns: 1fr;
    }
}

.organizer-card {
    text-align: center;
    transition: all var(--transition);
}

.organizer-card:hover {
    transform: translateY(-4px);
}

.organizer-image {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-md);
    border-radius: 50%;
    overflow: hidden;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.organizer-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.organizer-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
}

.organizer-placeholder svg {
    width: 40px;
    height: 40px;
    color: rgba(255, 255, 255, 0.6);
}

.organizer-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.organizer-name a {
    color: inherit;
    text-decoration: none;
}

.organizer-name a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.organizer-affiliation {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ========================================
   Sponsors Section
   ======================================== */
.sponsors-content {
    text-align: center;
}

.sponsors-text {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-2xl);
}

.sponsors-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.sponsor-placeholder {
    width: 200px;
    height: 100px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    border: 2px dashed var(--color-border);
}

.sponsors-cta {
    font-size: 1rem;
    color: var(--color-text-light);
}

.sponsors-cta a {
    font-weight: 600;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

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

.contact-text {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.contact-email {
    display: inline-block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-xl);
}

.contact-email:hover {
    color: var(--color-accent-dark);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.contact-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.contact-link svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-3xl) 0;
}

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

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    margin-bottom: var(--space-lg);
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--space-lg);
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu a {
        padding: var(--space-md) 0;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-meta {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .schedule-item {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .schedule-time {
        min-width: auto;
    }
    
    .deadline-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero {
        padding: var(--space-3xl) var(--space-md);
    }
    
    .section {
        padding: var(--space-3xl) 0;
    }
    
    .tracks-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .topics-categories {
        grid-template-columns: 1fr;
    }
    
    .topic-category {
        padding: var(--space-lg);
    }
}