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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #06b6d4;
    --accent: #a855f7;
    --dark: #000000;
    --darker: #000000;
    --gray: #9ca3af;
    --light-gray: #1a1a1a;
    --card-bg: #0a0a0a;
    --white: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #e5e7eb;
    background: #000000;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(59, 130, 246, 0.3);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.nav-tab {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray);
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-tab:hover {
    color: var(--primary);
    background: var(--light-gray);
}

.nav-tab.active {
    color: var(--white);
    background: var(--light-gray);
}

.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: var(--primary);
    border-radius: 3px 3px 0 0;
}

/* Main Content */
main {
    padding: 3rem 0;
}

.content-section {
    display: none;
    animation: fadeIn 0.5s ease;
}

.content-section.active {
    display: block;
}

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

/* Home Page */
.hero {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 4rem;
    margin-bottom: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-media {
    width: 100%;
    max-height: 500px;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 2rem;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.hero-media img,
.hero-media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-meta {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.hero-meta-item {
    display: flex;
    flex-direction: column;
}

.hero-meta-item label {
    font-size: 0.85rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.hero-meta-item span {
    font-size: 1.1rem;
    font-weight: 600;
    color: #f3f4f6;
}

.project-description {
    font-size: 1.15rem;
    line-height: 1.8;
    color: #d1d5db;
    margin: 2rem 0;
    padding: 2rem;
    background: rgba(26, 26, 26, 0.5);
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

/* Team Section */
.team-section {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    color: #f9fafb;
}

.team-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.team-member {
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.9) 0%, rgba(10, 10, 10, 0.95) 100%);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid rgba(59, 130, 246, 0.3);
    flex: 0 1 300px;
    max-width: 350px;
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.4);
    border-color: var(--primary);
}

.member-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--white);
    font-weight: bold;
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
    object-fit: cover;
}

.member-name {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #f9fafb;
}

.member-role {
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 1rem;
}

.member-description {
    color: #d1d5db;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Product Showcase */
.product-showcase {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
    margin-bottom: 3rem;
}

.product-container {
    position: relative;
    max-width: 900px;
    margin: 2rem auto;
}

.product-image {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.hotspot {
    position: absolute;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border: 3px solid var(--white);
    border-radius: 50%;
    cursor: pointer;
    animation: pulse 2s infinite;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.6);
    transition: all 0.3s ease;
}

.hotspot:hover {
    transform: scale(1.2);
    animation: none;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hotspot-tooltip {
    position: absolute;
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.8);
    min-width: 300px;
    max-width: 300px;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 10;
    border: 2px solid var(--primary);
}

.hotspot:hover .hotspot-tooltip {
    opacity: 1;
    pointer-events: auto;
}

.tooltip-title {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.tooltip-description {
    color: #d1d5db;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Documents Section */
.documents-section {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.doc-category {
    margin-bottom: 3rem;
}

.category-title {
    font-size: 1.5rem;
    color: #f9fafb;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary);
    display: inline-block;
}

.doc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.doc-card {
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.9) 0%, rgba(10, 10, 10, 0.95) 100%);
    border-radius: 12px;
    padding: 1.5rem;
    border: 2px solid rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
}

.doc-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

.doc-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--white);
    font-size: 1.5rem;
}

.doc-title {
    font-weight: 600;
    color: #f9fafb;
    margin-bottom: 0.5rem;
}

.doc-status {
    font-size: 0.85rem;
    color: var(--gray);
    font-style: italic;
}

.doc-status.uploaded {
    color: #10b981;
}

/* Video Section */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.video-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.video-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #1a1a1a 0%, #262626 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 3rem;
}

.video-info {
    padding: 1.5rem;
}

.video-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #f9fafb;
}

/* Acknowledgments */
.acknowledgments {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.5);
}

.acknowledgments h3 {
    margin-bottom: 1rem;
}

.sponsor-info {
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-tabs {
        display: none;
    }

    .hero {
        padding: 2rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-media {
        max-height: 300px;
    }

    .team-grid {
        flex-direction: column;
        align-items: center;
    }

    .team-member {
        max-width: 100%;
    }

    .product-showcase {
        padding: 1.5rem;
    }
}