* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #000000;
    --fg-color: #ffffff;
    --card-bg: #0d0d0d;
    --secondary-bg: #1a1a1a;
    --border-color: #333333;
    --muted-color: #999999;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--fg-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    overflow: visible;
}

.container-small {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem;
    position: relative;
    overflow: visible;
}

.hero-content {
    text-align: center;
    overflow: visible;
    padding: 0 2rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--secondary-bg);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    border: 1px solid var(--border-color);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: clamp(8rem, 25vw, 22rem);
    font-weight: 900;
    letter-spacing: -0.05em;
    margin-bottom: 3rem;
    padding: 2rem 1rem;
    overflow: visible;
    background: linear-gradient(
        90deg,
        #3b82f6,
        #8b5cf6,
        #6366f1,
        #3b82f6
    );
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 3s ease infinite, glow-pulse 3s ease infinite;
    filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.3));
    transition: transform 0.3s ease, filter 0.3s ease;
    cursor: pointer;
}

.hero-title:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 40px rgba(139, 92, 246, 0.8)) 
            drop-shadow(0 0 60px rgba(139, 92, 246, 0.6))
            drop-shadow(0 0 80px rgba(59, 130, 246, 0.4));
    animation: gradient-shift 1s ease infinite, glow-pulse 1s ease infinite, shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: scale(1.05) rotate(0deg); }
    25% { transform: scale(1.05) rotate(-1deg); }
    75% { transform: scale(1.05) rotate(1deg); }
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes glow-pulse {
    0% {
        filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.3)) 
                drop-shadow(0 0 20px rgba(59, 130, 246, 0.15));
    }
    50% {
        filter: drop-shadow(0 0 15px rgba(139, 92, 246, 0.4)) 
                drop-shadow(0 0 30px rgba(139, 92, 246, 0.2))
                drop-shadow(0 0 40px rgba(139, 92, 246, 0.1));
    }
    100% {
        filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.3)) 
                drop-shadow(0 0 20px rgba(59, 130, 246, 0.15));
    }
}

.highlight {
    color: var(--fg-color);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--muted-color);
    font-weight: 300;
    max-width: 48rem;
    margin: 0 auto 3rem;
    line-height: 1.8;
}

.hero-details {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
    padding-top: 2rem;
}

@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
    }
}

.divider {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--border-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    line-height: 1.75rem;
}

.btn-primary {
    background-color: var(--fg-color);
    color: var(--bg-color);
}

.btn-primary:hover {
    opacity: 0.9;
}

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

.btn-outline:hover {
    background-color: var(--secondary-bg);
}

.btn-full {
    width: 100%;
}

/* About Section */
.about {
    padding: 5rem 1rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-title .highlight {
    background: linear-gradient(
        90deg,
        #3b82f6,
        #8b5cf6,
        #6366f1,
        #3b82f6
    );
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 3s ease infinite;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--muted-color);
    max-width: 48rem;
    margin: 0 auto;
}

.cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

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

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 2rem;
    transition: border-color 0.3s ease;
}

.card:hover {
    border-color: var(--fg-color);
}

.card-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: var(--secondary-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.card-icon .icon {
    width: 1.5rem;
    height: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

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

/* Sponsors Section */
.sponsors {
    padding: 5rem 1rem;
    background-color: var(--card-bg);
}

.sponsors-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .sponsors-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.sponsor-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    background-color: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    transition: border-color 0.3s ease;
}

.sponsor-card:hover {
    border-color: var(--fg-color);
}

.sponsor-logo-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-color);
    border: 2px dashed var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.75rem;
    color: var(--muted-color);
    text-align: center;
    padding: 1rem;
}

.sponsor-name {
    font-weight: 600;
    text-align: center;
    color: var(--muted-color);
}

.sponsors-cta {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.sponsors-cta-text {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--muted-color);
}

/* Register Section */
.register {
    padding: 5rem 1rem;
}

.form-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 2.5rem;
}

@media (min-width: 768px) {
    .form-card {
        padding: 3rem;
    }
}

.form-group {
    margin-bottom: 2rem;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--secondary-bg);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    transition: border-color 0.3s ease;
}

.radio-option:hover {
    border-color: var(--fg-color);
}

.radio-option input[type="radio"] {
    cursor: pointer;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    flex: 1;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    color: var(--fg-color);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--fg-color);
}

.input-with-icon {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted-color);
    width: 1.25rem;
    height: 1.25rem;
}

.form-input.with-icon {
    padding-left: 2.5rem;
}

.form-textarea {
    resize: vertical;
}

.form-help {
    font-size: 0.875rem;
    color: var(--muted-color);
    margin-top: 0.5rem;
}

.success-message {
    text-align: center;
    padding: 2rem;
    background-color: var(--secondary-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.success-message h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 1rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
}

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

.footer-left {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

@media (min-width: 768px) {
    .footer-left {
        text-align: left;
    }
}

.footer-title {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1;
    background: linear-gradient(
        90deg,
        #3b82f6,
        #8b5cf6,
        #6366f1,
        #3b82f6
    );
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 3s ease infinite;
}

.footer-text {
    color: var(--muted-color);
    line-height: 1.5;
    margin: 0.25rem 0;
}

.footer-right {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

@media (min-width: 768px) {
    .footer-right {
        align-items: flex-end;
    }
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--fg-color);
}

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