/* ============================================
   CHRISTMAS CARD - GLOBAL STYLES
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    /* Color Palette - Warm Christmas Theme */
    --color-bg-primary: #0f1419;
    --color-bg-secondary: #1a2332;
    --color-bg-card: #1e2a3a;

    --color-present-box: #c41e3a;
    --color-present-box-dark: #8b1528;
    --color-present-ribbon: #ffd700;
    --color-present-ribbon-dark: #b8860b;
    --color-present-glow: rgba(255, 215, 0, 0.3);

    --color-text-primary: #f5e6d3;
    --color-text-secondary: #c9b896;
    --color-text-accent: #ffd700;

    --color-accent-warm: #e8a87c;
    --color-accent-gold: #ffd700;
    --color-accent-green: #2d5a27;

    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Cormorant Garamond', serif;

    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Shadows */
    --shadow-soft: 0 4px 30px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 60px rgba(255, 215, 0, 0.2);
}

/* Light mode overrides */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg-primary: #faf7f2;
        --color-bg-secondary: #f0ebe3;
        --color-bg-card: #ffffff;

        --color-text-primary: #2c1810;
        --color-text-secondary: #5c4a3d;
        --color-text-accent: #b8860b;

        --shadow-soft: 0 4px 30px rgba(0, 0, 0, 0.1);
        --shadow-glow: 0 0 60px rgba(255, 215, 0, 0.3);
    }
}

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg-primary);
    background-image:
        radial-gradient(ellipse at top, var(--color-bg-secondary) 0%, transparent 60%),
        radial-gradient(ellipse at bottom right, rgba(196, 30, 58, 0.1) 0%, transparent 50%);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    position: relative;
}

/* ---------- Snowfall Effect ---------- */
.snowfall {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.snowflake {
    position: absolute;
    top: -10px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
    animation: snowfall linear infinite;
    opacity: 0.7;
}

@keyframes snowfall {
    0% {
        transform: translateY(-10px) rotate(0deg);
    }

    100% {
        transform: translateY(100vh) rotate(360deg);
    }
}

/* ---------- Present Container ---------- */
.present-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    cursor: pointer;
    transition: transform 0.3s var(--transition-smooth);
}

.present-container:hover {
    transform: scale(1.02);
}

.present-container.hidden {
    pointer-events: none;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.8s var(--transition-smooth);
}

.present {
    position: relative;
    width: 200px;
    height: 200px;
    perspective: 1000px;
    transform-style: preserve-3d;
}

/* Present Box */
.present-box {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200px;
    height: 150px;
    transform-style: preserve-3d;
}

.box-front {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-present-box) 0%, var(--color-present-box-dark) 100%);
    border-radius: 8px 8px 12px 12px;
    box-shadow:
        inset 0 -10px 30px rgba(0, 0, 0, 0.3),
        0 10px 40px rgba(0, 0, 0, 0.4);
}

.box-ribbon-vertical {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 100%;
    background: linear-gradient(90deg, var(--color-present-ribbon-dark), var(--color-present-ribbon), var(--color-present-ribbon-dark));
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.box-ribbon-horizontal {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    height: 30px;
    background: linear-gradient(180deg, var(--color-present-ribbon-dark), var(--color-present-ribbon), var(--color-present-ribbon-dark));
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

/* Present Lid */
.present-lid {
    position: absolute;
    top: 0;
    left: -10px;
    width: 220px;
    height: 60px;
    transform-origin: bottom center;
    transition: transform 1.2s var(--transition-bounce);
    z-index: 5;
}

.lid-top {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-present-box) 0%, var(--color-present-box-dark) 100%);
    border-radius: 12px 12px 4px 4px;
    box-shadow:
        inset 0 5px 20px rgba(255, 255, 255, 0.1),
        0 -5px 20px rgba(0, 0, 0, 0.3);
}

.lid-ribbon-vertical {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 34px;
    height: 100%;
    background: linear-gradient(90deg, var(--color-present-ribbon-dark), var(--color-present-ribbon), var(--color-present-ribbon-dark));
}

.lid-ribbon-horizontal {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    height: 34px;
    background: linear-gradient(180deg, var(--color-present-ribbon-dark), var(--color-present-ribbon), var(--color-present-ribbon-dark));
}

/* Bow */
.bow {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 60px;
}

.bow-loop {
    position: absolute;
    width: 50px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-present-ribbon), var(--color-present-ribbon-dark));
    border-radius: 50% 50% 50% 50%;
    top: 10px;
}

.bow-loop-left {
    left: 0;
    transform: rotate(-30deg);
    box-shadow: inset -5px 0 15px rgba(0, 0, 0, 0.3);
}

.bow-loop-right {
    right: 0;
    transform: rotate(30deg);
    box-shadow: inset 5px 0 15px rgba(0, 0, 0, 0.3);
}

.bow-knot {
    position: absolute;
    left: 50%;
    top: 20px;
    transform: translateX(-50%);
    width: 25px;
    height: 25px;
    background: radial-gradient(circle, var(--color-present-ribbon), var(--color-present-ribbon-dark));
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.6);
    z-index: 2;
}

.bow-tail {
    position: absolute;
    bottom: -15px;
    width: 15px;
    height: 35px;
    background: linear-gradient(180deg, var(--color-present-ribbon), var(--color-present-ribbon-dark));
    border-radius: 0 0 50% 50%;
}

.bow-tail-left {
    left: 25px;
    transform: rotate(20deg);
}

.bow-tail-right {
    right: 25px;
    transform: rotate(-20deg);
}

/* Present Glow */
.present-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--color-present-glow) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
    z-index: -1;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* Tap Hint */
.tap-hint {
    margin-top: 40px;
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-style: italic;
    color: var(--color-text-secondary);
    animation: fadeInOut 2s ease-in-out infinite;
}

@keyframes fadeInOut {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

/* Opening Animation */
.present-container.opening .present-lid {
    transform: rotateX(-120deg) translateY(-50px);
}

.present-container.opening .present-glow {
    animation: explode 0.8s ease-out forwards;
}

@keyframes explode {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }

    100% {
        transform: translate(-50%, -50%) scale(3);
        opacity: 0;
    }
}

/* ---------- Card Content ---------- */
.card-content {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    z-index: 20;
    transition: opacity 0.8s var(--transition-smooth);
}

.card-content.visible {
    opacity: 1;
    pointer-events: all;
}

.card-inner {
    width: 90%;
    max-width: 600px;
    text-align: center;
    padding: 40px;
}

/* ---------- Message Section ---------- */
.message-section {
    display: none;
}

.message-section.active {
    display: block;
    animation: fadeIn 1s var(--transition-smooth);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.greeting {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    color: var(--color-text-accent);
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.4);
    margin-bottom: 30px;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {

    0%,
    100% {
        text-shadow: 0 0 30px rgba(255, 215, 0, 0.4);
    }

    50% {
        text-shadow: 0 0 50px rgba(255, 215, 0, 0.8), 0 0 80px rgba(255, 215, 0, 0.4);
    }
}

.typewriter-container {
    min-height: 200px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
    padding: 0 10px;
}

.typewriter-text {
    font-family: var(--font-body);
    font-size: clamp(1.2rem, 4vw, 1.6rem);
    line-height: 1.8;
    color: var(--color-text-primary);
    text-align: center;
    word-wrap: break-word;
}

.cursor {
    display: inline;
    font-family: var(--font-body);
    font-size: clamp(1.2rem, 4vw, 1.6rem);
    color: var(--color-text-accent);
    animation: blink 0.8s step-end infinite;
    font-weight: 400;
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

.continue-btn {
    font-family: var(--font-body);
    font-size: 1.1rem;
    padding: 15px 40px;
    background: transparent;
    border: 2px solid var(--color-text-accent);
    color: var(--color-text-accent);
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
    opacity: 0;
    transform: translateY(20px);
}

.continue-btn.visible {
    opacity: 1;
    transform: translateY(0);
}

.continue-btn:hover {
    background: var(--color-text-accent);
    color: var(--color-bg-primary);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.4);
}

/* ---------- Slideshow Section ---------- */
.slideshow-section {
    display: none;
}

.slideshow-section.active {
    display: block;
    animation: fadeIn 1s var(--transition-smooth);
}

.slideshow-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    background: var(--color-bg-card);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-soft), var(--shadow-glow);
}

.slide {
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    touch-action: pan-y pinch-zoom;
}

.slide:active {
    cursor: grabbing;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s var(--transition-smooth), opacity 0.3s var(--transition-smooth);
    pointer-events: none;
}

.slide-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.2);
}

.slide-dots {
    display: flex;
    gap: 10px;
}

.slide-dot {
    width: 10px;
    height: 10px;
    background: var(--color-text-secondary);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
    opacity: 0.5;
}

.slide-dot.active {
    background: var(--color-text-accent);
    opacity: 1;
    transform: scale(1.2);
}

.slide-caption {
    margin-top: 20px;
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-style: italic;
    color: var(--color-text-secondary);
}

/* ---------- Music Controls ---------- */
.music-controls {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s var(--transition-smooth);
}

.music-controls.visible {
    opacity: 1;
    transform: translateY(0);
}

.music-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-accent-gold);
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
    box-shadow: var(--shadow-soft);
}

.music-btn:hover {
    background: var(--color-accent-gold);
    transform: scale(1.05);
}

.music-btn:hover .music-label {
    color: var(--color-bg-primary);
}

.music-icon {
    font-size: 1.5rem;
    animation: none;
}

.music-btn.playing .music-icon {
    animation: bounce 0.5s ease infinite;
}

@keyframes bounce {

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

    50% {
        transform: translateY(-5px);
    }
}

.music-label {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-primary);
    transition: color 0.3s;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .present {
        transform: scale(0.8);
    }

    .card-inner {
        padding: 20px;
    }

    .music-controls {
        bottom: 20px;
        right: 20px;
    }

    .music-btn {
        padding: 10px 18px;
    }

    .music-label {
        display: none;
    }
}

/* ---------- Utility Classes ---------- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}