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

:root {
    --pink: #ff2d78;
    --purple: #7b2ff7;
    --cyan: #00d4ff;
    --yellow: #ffd600;
    --orange: #ff6b35;
    --green: #00e676;
    --dark: #0d0d1a;
    --card-bg: rgba(255, 255, 255, 0.08);
    --glass: rgba(255, 255, 255, 0.12);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #0d0d1a 0%, #1a0a2e 30%, #16213e 60%, #0d0d1a 100%);
    color: #fff;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

/* ===== Animated Background Shapes ===== */
.bg-shapes {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.35;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--pink);
    top: -100px;
    right: -50px;
    animation-delay: 0s;
}

.shape-2 {
    width: 250px;
    height: 250px;
    background: var(--purple);
    top: 40%;
    left: -80px;
    animation-delay: -5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: var(--cyan);
    bottom: 10%;
    right: 10%;
    animation-delay: -10s;
}

.shape-4 {
    width: 180px;
    height: 180px;
    background: var(--yellow);
    top: 20%;
    left: 50%;
    animation-delay: -7s;
}

.shape-5 {
    width: 220px;
    height: 220px;
    background: var(--orange);
    bottom: 30%;
    left: 20%;
    animation-delay: -3s;
}

.shape-6 {
    width: 160px;
    height: 160px;
    background: var(--green);
    top: 60%;
    right: -40px;
    animation-delay: -12s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.1); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 30px) scale(1.05); }
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0rem 1.5rem;
}

.hero-content {
    max-width: 600px;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: linear-gradient(135deg, var(--pink), var(--purple));
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.2rem;
    animation: fadeInDown 0.8s ease-out;
}

.hero h1 {
    font-family: 'Fredoka', sans-serif;
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.highlight {
    background: linear-gradient(135deg, var(--cyan), var(--pink), var(--yellow));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: clamp(1rem, 3vw, 1.1rem);
    opacity: 0.75;
    font-weight: 300;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.scroll-indicator {
    margin-top: 2rem;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 12px;
    margin: 0 auto;
    position: relative;
}

.scroll-indicator span::after {
    content: '';
    width: 4px;
    height: 8px;
    background: var(--cyan);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { top: 6px; opacity: 1; }
    50% { top: 20px; opacity: 0.3; }
}

/* ===== Participants Section ===== */
.participants-section {
    position: relative;
    z-index: 1;
    padding: 1rem 1.5rem 3rem;
    max-width: 700px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-header h2 {
    font-family: 'Fredoka', sans-serif;
    font-size: clamp(1.4rem, 5vw, 2rem);
    font-weight: 600;
}

.divider {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--pink), var(--cyan));
    border-radius: 2px;
    margin: 0.8rem auto 0;
}

/* ===== Pair Groups ===== */
.pair-group {
    margin-bottom: 2rem;
}

.pair-label {
    text-align: center;
    margin-bottom: 0.8rem;
}

.pair-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--glass);
    border-radius: 50%;
    font-size: 1.2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.participants-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* ===== Participant Card ===== */
.participant-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                box-shadow 0.4s ease;
    cursor: pointer;
    animation: cardAppear 0.6s ease-out both;
}

.participant-card:nth-child(1) { animation-delay: 0.1s; }
.participant-card:nth-child(2) { animation-delay: 0.2s; }

.participant-card:active {
    transform: scale(0.96);
}

.card-glow {
    position: absolute;
    inset: -2px;
    border-radius: 22px;
    background: linear-gradient(135deg, var(--pink), var(--purple), var(--cyan));
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s ease;
}

.participant-card:hover .card-glow,
.participant-card:focus .card-glow {
    opacity: 1;
}

.participant-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(123, 47, 247, 0.3);
}

.card-image {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    background: linear-gradient(135deg, #1a0a2e, #16213e);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.participant-card:hover .card-image img {
    transform: scale(1.05);
}

.card-info {
    padding: 0.8rem 1rem;
    text-align: center;
}

.card-info h3 {
    font-family: 'Fredoka', sans-serif;
    font-size: clamp(1rem, 4vw, 1.25rem);
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.view-3d {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.participant-card:hover .view-3d {
    opacity: 1;
}

/* ===== Footer ===== */
footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem 1rem;
    font-size: 0.8rem;
    opacity: 0.4;
}

/* ===== Viewer Page ===== */
.viewer-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
}

.viewer-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background: var(--glass);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: background 0.3s, transform 0.3s;
    align-self: flex-start;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-4px);
}

.viewer-header {
    text-align: center;
}

.viewer-header h1 {
    font-family: 'Fredoka', sans-serif;
    font-size: clamp(1.8rem, 7vw, 2.5rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--cyan), var(--pink));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.viewer-hint {
    font-size: 0.75rem;
    opacity: 0.5;
    margin-top: 0.3rem;
}

.model-wrapper {
    width: 100%;
    aspect-ratio: 3 / 4;
    border-radius: 24px;
    overflow: hidden;
    background: linear-gradient(145deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
    position: relative;
}

model-viewer {
    --poster-color: transparent;
}

/* ===== Loading ===== */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13, 13, 26, 0.8);
    z-index: 10;
}

.loader {
    text-align: center;
}

.loader-ring {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.15);
    border-top-color: var(--cyan);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader p {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ===== Viewer Actions ===== */
.viewer-actions {
    display: flex;
    justify-content: center;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--purple), var(--pink));
    border: none;
    border-radius: 50px;
    color: #fff;
    font-family: 'Poppins', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(123, 47, 247, 0.4);
}

.btn-icon {
    font-size: 1.1rem;
}

/* ===== Animations ===== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ===== Responsive ===== */
@media (max-width: 400px) {
    .participants-row {
        gap: 0.75rem;
    }

    .card-info {
        padding: 0.6rem 0.5rem;
    }
}

@media (min-width: 768px) {
    .hero {
        min-height: 50vh;
    }

    .participants-section {
        padding: 2rem 2rem 4rem;
    }

    .pair-group {
        margin-bottom: 2.5rem;
    }

    .participants-row {
        gap: 1.5rem;
    }

    .participant-card {
        border-radius: 24px;
    }

    .card-info {
        padding: 1rem 1.2rem;
    }
}