/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    /* Color Palette - Clean & Premium */
    --bg-primary: #FAF7F2;
    --bg-secondary: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #6B6B6B;
    --text-muted: #9B9B9B;
    --accent: #8B1A2B;          /* Burgundy */
    --accent-soft: #C41E3A;     /* Rose */
    --gold: #B8935A;            /* Gold tipis */
    --border: rgba(26, 26, 26, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    color: inherit;
}

/* ============================================
   PIN SCREEN
   ============================================ */
.pin-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.pin-screen.unlocked {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.pin-container {
    text-align: center;
    max-width: 320px;
    width: 100%;
}

.pin-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    animation: pulse 2s ease-in-out infinite;
}

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

.pin-greeting {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.pin-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    letter-spacing: 0.02em;
}

.pin-input-wrapper {
    position: relative;
    margin-bottom: var(--space-md);
}

.pin-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 2;
    cursor: text;
}

.pin-dots {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
}

.pin-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 1.5px solid var(--text-primary);
    transition: all 0.3s ease;
}

.pin-dot.filled {
    background: var(--accent);
    border-color: var(--accent);
    transform: scale(1.1);
}

.pin-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Shake animation for wrong PIN */
.pin-container.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-10px); }
    40%, 80% { transform: translateX(10px); }
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    opacity: 0;
    transition: opacity 1s ease 0.3s;
}

.main-content.visible {
    opacity: 1;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl) var(--space-md);
    padding-top: calc(var(--space-xl) + env(safe-area-inset-top));
    padding-bottom: calc(var(--space-xl) + env(safe-area-inset-bottom));
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 420px;
}

.hero-date {
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 12vw, 4.5rem);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
}

.hero-title span {
    color: var(--accent);
    font-style: italic;
}

.hero-name {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.hero-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 280px;
    margin: 0 auto var(--space-xl);
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    position: absolute;
    bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator span {
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.2); }
}

/* ============================================
   SLIDER SECTION
   ============================================ */
.slider-section {
    padding: var(--space-xl) 0;
    overflow: hidden;
}

.slider-container {
    position: relative;
    max-width: 100%;
}

.slider-track {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 4;
    overflow: hidden;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 1s ease;
    pointer-events: none;
}

.slide.active {
    opacity: 1;
    pointer-events: auto;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slide-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    color: white;
}

.slide-content h3 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.slide-content p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: var(--space-md);
}

.slide-btn {
    background: white;
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: transform 0.3s ease;
}

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

.slider-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: var(--space-md);
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    opacity: 0.3;
    transition: all 0.3s ease;
}

.dot.active {
    width: 24px;
    border-radius: 3px;
    background: var(--accent);
    opacity: 1;
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header {
    text-align: center;
    padding: 0 var(--space-md);
    margin-bottom: var(--space-xl);
}

.section-tag {
    display: inline-block;
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2.25rem, 10vw, 3.5rem);
    font-weight: 500;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 280px;
    margin: 0 auto;
}

/* ============================================
   CARDS SECTION - Interactive Memory Cards
   ============================================ */
.cards-section {
    padding: var(--space-2xl) var(--space-md);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    max-width: 420px;
    margin: 0 auto;
}

.memory-card {
    aspect-ratio: 1;
    perspective: 1000px;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

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

.card-front, .card-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.card-front {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.card-front span {
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--accent);
}

.card-back {
    transform: rotateY(180deg);
    background: var(--text-primary);
}

.card-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.surprise-msg {
    text-align: center;
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    animation: fadeUp 0.8s ease;
}

.surprise-msg span {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    color: var(--accent);
    display: block;
    margin-bottom: 0.5rem;
}

.surprise-msg p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   LETTER SECTION
   ============================================ */
.letter-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--bg-secondary);
}

.letter-content {
    max-width: 420px;
    margin: 0 auto;
}

.letter-paper {
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.letter-date {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.letter-dear {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--accent);
    margin-bottom: var(--space-md);
}

.letter-body {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
    min-height: 200px;
    white-space: pre-wrap;
}

.letter-body::after {
    content: '|';
    color: var(--accent);
    animation: blink 1s infinite;
    margin-left: 2px;
}

.letter-body.done::after {
    display: none;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.letter-sign {
    margin-top: var(--space-lg);
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-secondary);
    text-align: right;
}

.letter-sign span {
    font-size: 1.25rem;
    color: var(--text-primary);
}

/* ============================================
   ALBUM SECTION
   ============================================ */
.album-section {
    padding: var(--space-2xl) var(--space-md);
}

.album-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    max-width: 420px;
    margin: 0 auto;
}

.album-item {
    aspect-ratio: 1;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    background: var(--bg-secondary);
}

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

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

/* ============================================
   TIMELINE SECTION
   ============================================ */
.timeline-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--bg-secondary);
}

.timeline {
    max-width: 420px;
    margin: 0 auto;
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 4px;
    width: 17px;
    height: 17px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--accent);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.timeline-date {
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
    font-weight: 500;
}

.timeline-content h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin: 0.5rem 0;
    font-weight: 500;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   PLAYLIST SECTION
   ============================================ */
.playlist-section {
    padding: var(--space-2xl) var(--space-md);
}

.playlist-list {
    max-width: 420px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: transform 0.3s ease;
}

.playlist-item:active {
    transform: scale(0.98);
}

.playlist-cover {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
}

.playlist-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.playlist-info {
    flex: 1;
    min-width: 0;
}

.playlist-info h4 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.125rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.playlist-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.playlist-play {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.playlist-play:active {
    transform: scale(0.9);
}

.playlist-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

/* ============================================
   QUOTES SECTION
   ============================================ */
.quotes-section {
    padding: var(--space-2xl) 0;
    background: var(--bg-secondary);
    overflow: hidden;
}

.quotes-section .section-header {
    margin-bottom: var(--space-lg);
}

.quotes-track {
    display: flex;
    gap: var(--space-sm);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 0 var(--space-md);
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.quotes-track::-webkit-scrollbar {
    display: none;
}

.quote-card {
    flex: 0 0 80%;
    max-width: 320px;
    aspect-ratio: 3 / 4;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    scroll-snap-align: center;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.quote-card p {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    line-height: 1.5;
    font-style: italic;
    color: var(--text-primary);
}

.quote-card span {
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-2xl) var(--space-md);
    text-align: center;
    background: var(--text-primary);
    color: var(--bg-primary);
}

.footer-heart {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    animation: pulse 2s ease-in-out infinite;
}

.footer-text {
    font-family: var(--font-serif);
    font-size: 1rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    opacity: 0.8;
}

.footer-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.footer-date {
    font-size: 0.8rem;
    opacity: 0.6;
    letter-spacing: 0.1em;
}

/* ============================================
   MUSIC PLAYER - Fixed bottom
   ============================================ */
.music-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 0.5rem var(--space-md);
    padding-bottom: calc(0.5rem + env(safe-area-inset-bottom));
    z-index: 100;
    transform: translateY(100%);
    transition: transform 0.5s ease;
}

.music-player.visible {
    transform: translateY(0);
}

.player-progress {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--border);
    cursor: pointer;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.1s linear;
}

.player-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.player-cover {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
}

.player-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.player-info {
    flex: 1;
    min-width: 0;
}

.player-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-artist {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.ctrl-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    transition: background 0.3s ease;
    color: var(--text-primary);
}

.ctrl-btn:active {
    background: var(--border);
}

.play-btn {
    width: 44px;
    height: 44px;
    background: var(--accent);
    color: white;
    font-size: 1rem;
}

.play-btn:active {
    background: var(--accent-soft);
}

.ctrl-btn.active {
    color: var(--accent);
}

/* ============================================
   LIGHTBOX
   ============================================ */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.lightbox.visible {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    overflow: hidden;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
    touch-action: pinch-zoom;
}

.lightbox-close, .lightbox-prev, .lightbox-next {
    position: absolute;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.lightbox-close {
    top: calc(var(--space-md) + env(safe-area-inset-top));
    right: var(--space-md);
}

.lightbox-prev {
    left: var(--space-sm);
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-next {
    right: var(--space-sm);
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-counter {
    position: absolute;
    bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    background: rgba(0, 0, 0, 0.4);
    padding: 0.5rem 1rem;
    border-radius: 100px;
    backdrop-filter: blur(10px);
}

/* ============================================
   ANIMATIONS - Fade Up on scroll
   ============================================ */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* ============================================
   RESPONSIVE - Tablet & Desktop
   ============================================ */
@media (min-width: 768px) {
    .hero-title {
        font-size: 5rem;
    }
    
    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
        max-width: 600px;
    }
    
    .album-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 700px;
    }
    
    .quote-card {
        flex: 0 0 400px;
    }
    
    .music-player {
        max-width: 500px;
        left: 50%;
        transform: translate(-50%, 100%);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }
    
    .music-player.visible {
        transform: translate(-50%, 0);
    }
}

@media (min-width: 1024px) {
    .album-grid {
        grid-template-columns: repeat(4, 1fr);
        max-width: 900px;
    }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}