:root {
    --primary-green: #004d40;
    --secondary-green: #00695c;
    --gold: #ffd700;
    --gold-dark: #b8860b;
    --red: #d32f2f;
    --red-dark: #b71c1c;
    --text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    --border-gold: 2px solid #ffd700;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--primary-green);
    color: white;
    /* Use dvh to handle mobile browser address bars correctly */
    height: 100dvh;
    width: 100vw;
    overflow: hidden;
    background: radial-gradient(circle at center, #00695c 0%, #004d40 100%);
    /* Prevent bouncy scroll on iOS */
    overscroll-behavior: none;
}

.app-container {
    max-width: 480px;
    /* Mobile width mimic */
    width: 100%;
    margin: 0 auto;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 10px;
    background-image: url('assets/bg-main.png');
    background-size: 100% 100%;
    /* Stretch to fill as it's a specific design */
    background-position: top center;
    background-repeat: no-repeat;
}

/* --- Header --- */
.main-header {
    /* Removed flex: 1 to stop pushing content down */
    display: flex;
    justify-content: center;
    align-items: flex-end;
    /* Align bottom to be safer */
    width: 100%;
    text-align: center;
    padding-top: 40dvh;
    /* Adjusted to 40dvh as requested */
    padding-bottom: 2dvh;
}

.title-text {
    /* Title is in the background image now */
    display: none;
    font-family: 'Dancing Script',
        cursive;
    /* Responsive font size based on viewport width */
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    line-height: 1.2;
    background: linear-gradient(to bottom, #fff7ad, #ffa000);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0px 4px 6px rgba(0, 0, 0, 0.8));
    transform: rotate(-5deg);
}

.year {
    font-size: clamp(4rem, 12vw, 6rem);
    display: block;
    margin-top: -10px;
}

/* --- Main Game Area --- */
.game-area {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1dvh;
    padding-bottom: 20px;
    /* Space for footer */
    z-index: 10;
}

.cards-container {
    display: flex;
    justify-content: center;
    gap: 25px;
    width: 100%;
    margin-bottom: 1dvh;
}

.card {
    width: 42%;
    /* Slightly smaller to ensure fit */
    aspect-ratio: 1/1;
    background: linear-gradient(135deg, #b71c1c, #d32f2f);
    border: 3px solid #ffd700;
    border-radius: 15px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5), inset 0 0 20px rgba(255, 215, 0, 0.3);
    /* Touch optimization */
    touch-action: manipulation;
    /* Breathing animation */
    animation: breathing 2s infinite ease-in-out;
}

@keyframes breathing {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
        /* Slight scale up */
    }

    100% {
        transform: scale(1);
    }
}

.card-header-badge {
    position: absolute;
    top: -12px;
    background: #8b0000;
    color: #ffd700;
    padding: 4px 8px;
    border-radius: 20px;
    font-size: clamp(0.7rem, 2.5vw, 0.9rem);
    font-weight: bold;
    border: 1px solid #ffd700;
    white-space: nowrap;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    z-index: 2;
}

.img-placeholder {
    font-size: clamp(3rem, 10vw, 4.5rem);
    filter: drop-shadow(0 5px 5px rgba(0, 0, 0, 0.5));
}

/* --- Buttons --- */
.btn {
    cursor: pointer;
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    text-transform: uppercase;
    border: none;
    outline: none;
    transition: transform 0.1s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn:active {
    transform: scale(0.96);
}

.btn-primary {
    width: 75%;
    padding: 15px;
    /* Ensure minimum touch target size */
    min-height: 55px;
    border-radius: 50px;
    font-size: clamp(1.2rem, 5vw, 1.6rem);
    color: #fff;
    background: linear-gradient(to bottom, #d50000, #8b0000);
    border: 3px solid #ffd700;
    box-shadow:
        0 6px 0 #5a0000,
        0 10px 10px rgba(0, 0, 0, 0.5);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
    background-size: 200% auto;
    margin-top: 10px;
}

.secondary-actions {
    display: flex;
    gap: 20px;
    width: 80%;
    justify-content: center;
    margin-top: 5px;
}

.btn-secondary {
    flex: 1;
    padding: 10px;
    min-height: 44px;
    /* Apple Human Interface Guideline minimum */
    border-radius: 50px;
    font-size: clamp(0.9rem, 3.5vw, 1.1rem);
    color: #fff;
    background: linear-gradient(to bottom, #00bfa5, #00695c);
    border: 3px solid #ffd700;
    box-shadow:
        0 4px 0 #003d33,
        0 6px 6px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.btn-secondary .icon {
    font-size: 1.2rem;
}

/* --- Footer --- */
.footer-decoration {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff44' fill-opacity='1' d='M0,224L48,213.3C96,203,192,181,288,181.3C384,181,480,203,576,224C672,245,768,267,864,250.7C960,235,1056,181,1152,165.3C1248,149,1344,171,1392,181.3L1440,192L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: bottom;
    pointer-events: none;
    z-index: 1;
    display: block;
}

/* Image Mode Overrides */
.btn-img-mode {
    background: none !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    min-height: auto !important;
    width: auto !important;
    display: inline-flex !important;
}

.btn-img-mode img {
    display: block;
    max-width: 100%;
    height: auto;
    transition: transform 0.1s;
}

.btn-img-mode:active img {
    transform: scale(0.95);
}

/* Remove default card styling to let image take over */
.card-lixi,
.card-gift {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
}

.card-content {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 5px 5px rgba(0, 0, 0, 0.3));
}

.secondary-actions {
    gap: 10px;
    align-items: flex-start;
}

/* --- Popup --- */
/* Custom Rules Popup Styles */
.popup-rules-custom {
    max-width: 450px !important;
    width: 95% !important;
}

.rules-bg-wrapper {
    position: relative;
    width: 100%;
}

.rules-bg-img {
    width: 100%;
    display: block;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.5));
}

.rules-scroll-area {
    position: absolute;
    top: 14%;
    left: 12%;
    width: 76%;
    height: 72%;
    overflow-y: auto;
    padding-right: 5px;
    /* Custom Scrollbar */
    scrollbar-width: thin;
    scrollbar-color: #d8a027 transparent;
}

.rules-scroll-area::-webkit-scrollbar {
    width: 6px;
}

.rules-scroll-area::-webkit-scrollbar-thumb {
    background-color: #d8a027;
    border-radius: 3px;
}

.rules-scroll-area::-webkit-scrollbar-track {
    background: transparent;
}

.rules-content-img {
    width: 100%;
    height: auto;
    display: block;
}

.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    align-items: center;
    /* Zoom in animation */
    animation: zoomIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    /* Bouncy fast zoom */
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.popup-container {
    position: relative;
    width: 90%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Specific fix for Game Page Background */
#game-page {
    /* "Giãn tự động" - Stretch to fill */
    background-size: cover !important;
    background-position: center !important;
    background-repeat: no-repeat !important;
    aspect-ratio: 9/16;
    /* Ensure it hits the edges or centers? */
    width: 100vw;
    height: auto;
    /* Let aspect ratio define height, or max-height 100dvh? */
    min-height: 100dvh;
    /* Or force full height */
}

/* --- Game Page Styles --- */
.envelopes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* grid-template-rows: repeat(2, 1fr); */
    gap: 0px;
    column-gap: 15px;
    width: 75%;

    /* Absolute positioning to place it freely on background */
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 20%;
    /* Adjusted lower for mobile alignment */

    margin: 0;
    padding: 0px;
    z-index: 10;
}

.envelope-item {
    width: 100%;
    aspect-ratio: 0.55;
    background: transparent;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.2s;
    position: relative;
    touch-action: manipulation;
}

/* Game Page - Flat Grid Layout */
/* Staggered margins removed for uniform grid */

.envelope-item:active {
    transform: scale(0.95);
}

.envelope-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
}

/* Float animation */
@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
        /* Increased from -3px to -10px */
    }

    100% {
        transform: translateY(0px);
    }
}

.envelope-item {
    animation: float 3s ease-in-out infinite;
}

.envelope-item:nth-child(even) {
    animation-delay: 1.5s;
}

.popup-note-img {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.5));
}

.popup-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    width: 100%;
    margin-top: 20px;
}

.btn-popup-action {
    width: 45%;
    height: auto;
    cursor: pointer;
    z-index: 20;
    transition: transform 0.2s;
    display: flex;
    /* alignment */
    justify-content: center;
}

.btn-popup-action img {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 4px 4px rgba(0, 0, 0, 0.3));
}

.btn-popup-action:active {
    transform: scale(0.95);
}

.btn-popup-close {
    margin-top: 15px;
    /* Add space instead of overlap */
    background: none;
    border: none;
    cursor: pointer;
    width: 80%;
    /* Make button larger */
    transition: transform 0.2s;
    z-index: 101;
}

.result-note {
    color: #fff;
    text-align: center;
    font-size: clamp(0.9rem, 3vw, 1.1rem);
    margin: 10px 0;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
    width: 90%;
    line-height: 1.4;
}

.btn-popup-close:active {
    transform: scale(0.95);
}

.btn-popup-close img {
    width: 100%;
    height: auto;
    display: block;
}

/* Ensure contact popup appears above result popup */
#popup-contact {
    z-index: 200 !important;
}

/* Ensure rules popup appears above everything */
#popup-rules {
    z-index: 300 !important;
}