/* Root Variables */
:root {
    --bg: #f5f5f7;
    --card-front: #c40000;
    --card-back: #111111;
    --card-border: #f9f9f9;
    --text-primary: #111111;
    --text-secondary: #555555;
    --accent: #c8102e;
    --accent-light: rgba(200, 16, 46, 0.15);
    --locked: rgba(17, 17, 17, 0.5);
    --unlocked-shadow: rgba(200, 16, 46, 0.25);
    --modal-bg: #ffffff;
    --modal-shadow: 0 24px 72px rgba(17, 17, 17, 0.2);
}

/* Logo Banner */
.logo-banner {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1.5rem;
}

.logo-banner img {
    max-width: clamp(280px, 60vw, 480px);
    height: auto;
}

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

html, body {
    min-height: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    padding: 2.5rem 1.5rem 4rem;
}

.page-wrapper {
    width: min(1200px, 100%);
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.header {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.header-text {
    display: flex;
    flex-direction: column;
}

.main-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.4rem, 4vw, 3.2rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.countdown {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    text-align: center;
}

#countdownText {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.25rem;
    letter-spacing: 0.08em;
}

.countdown-time {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    letter-spacing: 0.1em;
}

.countdown-progress {
    width: min(360px, 100%);
    margin: 0 auto;
    height: 8px;
    border-radius: 999px;
    background: rgba(17, 17, 17, 0.1);
    overflow: hidden;
}

.countdown-progress-fill {
    height: 100%;
    width: 0;
    background: var(--accent);
    transition: width 0.6s ease;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1.5rem;
}

.card {
    perspective: 1200px;
    position: relative;
    height: 0;
    padding-bottom: 130%;
}

.card-inner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    transition: transform 0.7s cubic-bezier(0.4, 0.12, 0.2, 1);
    border-radius: 1.2rem;
    box-shadow: 0 20px 44px rgba(17, 17, 17, 0.12);
    overflow: hidden;
}

.card.flipped .card-inner {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 1.2rem;
    border: 3px solid transparent;
}

.card-front {
    background: var(--card-front);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.18);
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
}

.card-back {
    background: var(--card-back);
    transform: rotateY(180deg);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.12);
}

.card-number {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    letter-spacing: 0.05em;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    transition: opacity 0.35s ease;
}

.card.flipped .card-number {
    opacity: 0;
}

.card-special .card-number {
    font-size: 6rem;
    text-shadow:
        3px 3px 6px var(--shadow-dark),
        0 0 20px var(--shadow-glow),
        0 0 40px var(--shadow-glow);
}

.card-special .card-back-text {
    font-size: clamp(1.4rem, 4vw, 2.2rem);
}

.card.locked .card-inner {
    filter: grayscale(0.12) saturate(0.8);
    box-shadow: none;
    border: 2px solid rgba(17, 17, 17, 0.08);
}

.card.locked {
    cursor: not-allowed;
}

.card.opening .card-inner {
    animation: pop-open 0.6s ease forwards;
}

.card.opening::after {
    content: '';
    position: absolute;
    inset: -10%;
    border-radius: 1.5rem;
    border: 2px solid rgba(200, 16, 46, 0.4);
    opacity: 0;
    animation: ring 0.75s ease forwards;
}

@keyframes pop-open {
    0% { transform: scale(1); }
    45% { transform: scale(1.04); }
    100% { transform: scale(1); }
}

@keyframes ring {
    0% { opacity: 0.6; transform: scale(0.92); }
    100% { opacity: 0; transform: scale(1.08); }
}

.card:not(.locked):hover .card-inner {
    transform: translateY(-6px);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(17, 17, 17, 0.6);
    align-items: center;
    justify-content: center;
    padding: 2rem;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    width: min(680px, 100%);
    max-height: 85vh;
    background: var(--modal-bg);
    border-radius: 1.2rem;
    padding: 2.5rem;
    position: relative;
    box-shadow: var(--modal-shadow);
    overflow-y: auto;
}

.modal-close {
    position: absolute;
    top: 1.2rem;
    right: 1.4rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(17, 17, 17, 0.06);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: background 0.2s ease;
}

.modal-close:hover {
    background: rgba(17, 17, 17, 0.16);
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    color: var(--text-primary);
}

.modal-body h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
}

.content-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.modal-video iframe {
    width: 100%;
    height: 340px;
    border-radius: 1rem;
    border: none;
}

.modal-pdf {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pdf-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    align-self: flex-start;
    padding: 0.75rem 1.4rem;
    background: var(--accent);
    color: #ffffff;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.pdf-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(200, 16, 46, 0.25);
}

.pdf-embed {
    width: 100%;
    height: 420px;
    border: 1px solid rgba(17, 17, 17, 0.08);
    border-radius: 1rem;
}

.footer-message {
    text-align: center;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--accent);
    min-height: 1.5rem;
}

@media (max-width: 768px) {
    body {
        padding: 1.5rem 1rem 3rem;
    }

    .page-wrapper {
        gap: 2rem;
    }

    .header {
        gap: 1rem;
    }

    .countdown {
        padding: 1rem 1.1rem;
    }

    .modal-content {
        padding: 2rem;
    }

    .modal-video iframe,
    .pdf-embed {
        height: 260px;
    }
}

@media (max-width: 767px) {
    .card-special .card-number {
        font-size: 4rem;
    }
}