:root {
    --primary-color: #4a6cf7;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --card-bg: rgba(255, 255, 255, 0.8);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.2);
    --transition: all 0.3s ease;
}

.dark-mode {
    --primary-color: #5d78ff;
    --text-color: #f0f0f0;
    --bg-color: #121212;
    --card-bg: rgba(30, 30, 30, 0.8);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(74, 108, 247, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(74, 108, 247, 0.1) 0%, transparent 20%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header Styles */
header {
    padding: 20px 0;
    position: relative;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 60px;
    height: 30px;
    background: var(--card-bg);
    border-radius: 30px;
    border: var(--glass-border);
    box-shadow: var(--shadow);
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 0 5px;
    transition: var(--transition);
    z-index: 100;
}

.theme-toggle:hover {
    box-shadow: 0 0 15px rgba(74, 108, 247, 0.3);
}

.toggle-ball {
    width: 22px;
    height: 22px;
    background: var(--primary-color);
    border-radius: 50%;
    position: absolute;
    left: 5px;
    transition: var(--transition);
}

.dark-mode .toggle-ball {
    transform: translateX(30px);
}

.theme-toggle i {
    font-size: 14px;
    color: var(--text-color);
    transition: var(--transition);
}

.theme-toggle .sun {
    margin-right: auto;
}

.theme-toggle .moon {
    margin-left: auto;
}

/* Logo Section */
.logo-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
    text-align: center;
}

.logo {
    width: 100px;
    height: 100px;
    background: var(--primary-color);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    border: var(--glass-border);
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(74, 108, 247, 0.3);
}

.logo i {
    font-size: 50px;
    color: white;
}

.logo-title {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--primary-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: var(--transition);
}

.logo-subtitle {
    font-size: clamp(0.9rem, 2vw, 1rem);
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
}

/* Button Grid */
.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr));
    gap: 20px;
    padding: 40px 0;
    width: 100%;
}

.glass-button {
    background: var(--card-bg);
    border: var(--glass-border);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    aspect-ratio: 1/1;
    position: relative;
    overflow: hidden;
}

.glass-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(74, 108, 247, 0.2);
}

.glass-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(74, 108, 247, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.glass-button:hover::before {
    opacity: 1;
}

.button-icon {
    font-size: 30px;
    margin-bottom: 15px;
    color: var(--primary-color);
    transition: var(--transition);
    width: 100%;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.button-icon img {
    width: 30px;
    height: 30px;
    object-fit: contain;
}

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

.button-text {
    font-weight: 600;
    margin-bottom: 5px;
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.button-count {
    font-size: 0.8rem;
    opacity: 0.7;
    background: rgba(74, 108, 247, 0.1);
    padding: 3px 8px;
    border-radius: 10px;
    transition: var(--transition);
}

.glass-button:hover .button-count {
    background: rgba(74, 108, 247, 0.2);
    opacity: 1;
}

/* Footer */
footer {
    margin-top: auto;
    padding: 40px 0;
    background: var(--card-bg);
    border-top: var(--glass-border);
}

.sponsors-section {
    text-align: center;
}

.sponsors-title {
    font-size: 1rem;
    margin-bottom: 20px;
    opacity: 0.7;
}

.sponsor-logos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
}

.sponsor-logo {
    height: clamp(45px, 5vw, 40px);
    opacity: 0.7;
    transition: var(--transition);
    filter: grayscale(100%) brightness(var(--logo-brightness, 1));
}

.dark-mode .sponsor-logo {
    --logo-brightness: 2;
}

.sponsor-logo:hover {
    opacity: 1;
    filter: grayscale(0%) brightness(1);
    transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .logo {
        width: clamp(70px, 15vw, 100px);
        height: clamp(70px, 15vw, 100px);
    }

    .logo i {
        font-size: clamp(30px, 8vw, 50px);
    }
}

@media (max-width: 480px) {
    .button-grid {
        gap: 15px;
    }

    .theme-toggle {
        top: 15px;
        right: 15px;
        width: 55px;
        height: 28px;
    }

    .toggle-ball {
        width: 20px;
        height: 20px;
    }

    .dark-mode .toggle-ball {
        transform: translateX(27px);
    }
}

@media (max-width: 350px) {
    .button-grid {
        grid-template-columns: 1fr 1fr;
    }
}

a.glass-button {
    text-decoration: none;
    color: inherit;
}