:root {
    /* KUROMI / PURPLE THEME */
    --bg-color: #120a1a;        /* Deep dark purple */
    --bg-darker: #0a050f;       /* Almost black purple */
    --text-primary: #f0e6f5;       /* Soft pinkish white */
    --text-secondary: #b89cc2;      /* Muted lavender */
    --accent: #d794f6;          /* Kuromi purple accent */
    --accent-glow: rgba(215, 148, 246, 0.4);  
    --lightbox-bg: rgba(10, 5, 15, 0.95);
    
    /* Typography */
    --font-serif: 'Cormorant Garamond', serif;
    --font-sans: 'Inter', sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    --space-xxl: 12rem;
    
    /* Animations */
    --transition-fast: 0.3s ease;
    --transition-normal: 0.8s cubic-bezier(0.25, 1, 0.5, 1);
    --transition-slow: 1.5s cubic-bezier(0.25, 1, 0.5, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Custom minimal scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 3px;
}

/* ==========================================================================
   UTILITY CLASSES & TYPOGRAPHY
   ========================================================================== */
.serif-text { font-family: var(--font-serif); }
.sans-text { font-family: var(--font-sans); }

.small-text {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
}

.tracking-wide { letter-spacing: 0.15em; }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0 !important; }
.mt-4 { margin-top: 2rem; }

.section-title {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: var(--space-md);
    font-style: italic;
    color: var(--text-primary) !important;
}

.large-text {
    font-size: 1.5rem;
    line-height: 1.8;
    color: var(--text-primary) !important;
}

/* ==========================================================================
   GLOBAL ELEMENTS
   ========================================================================== */
::selection {
    background: var(--accent-glow);
    color: #fff;
}
::-moz-selection {
    background: var(--accent-glow);
    color: #fff;
}

/* Ambient Light Leaks */
.ambient-light {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
.ambient-light::before, .ambient-light::after {
    content: '';
    position: absolute;
    width: 60vw; height: 60vw;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(215, 148, 246, 0.15) 0%, transparent 60%);
    animation: drift 20s infinite alternate ease-in-out;
}
.ambient-light::before {
    top: -10%; left: -10%;
}
.ambient-light::after {
    bottom: -10%; right: -10%;
    background: radial-gradient(circle, rgba(162, 110, 212, 0.1) 0%, transparent 60%);
    animation: drift 25s infinite alternate-reverse ease-in-out;
}
@keyframes drift {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(5vw, 5vh) scale(1.1); }
}

/* Subtle Film Grain */
.grain {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    pointer-events: none;
    z-index: 5;
    opacity: 0.04;
    background-image: url('data:image/svg+xml,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noiseFilter)"/%3E%3C/svg%3E');
}

/* Floating Particles (Romance Vibe) */
.particles-container {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}
.particle {
    position: absolute;
    bottom: -30px;
    opacity: 0;
    animation: float-up linear forwards;
    display: flex;
    justify-content: center;
    align-items: center;
    filter: drop-shadow(0 0 5px var(--accent-glow));
}
@keyframes float-up {
    0% { transform: translateY(0) scale(0.8) rotate(0deg); opacity: 0; }
    10% { opacity: 0.8; }
    90% { opacity: 0.8; }
    100% { transform: translateY(-110vh) scale(1.2) rotate(45deg); opacity: 0; }
}

/* Scroll Progress */
.scroll-indicator {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 3px;
    z-index: 1000;
    background: transparent;
}
.scroll-indicator .progress {
    height: 100%;
    background-color: var(--text-primary);
    width: 0%;
    transition: width 0.1s;
}

/* Music Player Toggle */
.music-btn {
    position: fixed;
    bottom: 2rem; right: 2rem;
    width: 45px; height: 45px;
    border-radius: 50%;
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    z-index: 1000;
    display: flex;
    align-items: center; justify-content: center;
    transition: var(--transition-fast);
    backdrop-filter: blur(5px);
}
.music-btn:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    border-color: var(--text-primary);
}
.music-btn.playing {
    border-color: var(--text-primary);
}

/* ==========================================================================
   LAYOUT & SECTIONS
   ========================================================================== */
.section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-xl) var(--space-md);
    position: relative;
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* 1. Hero Section */
.hero {
    align-items: center;
    text-align: center;
}
.hero .display-title {
    font-family: var(--font-serif);
    font-size: clamp(4rem, 15vw, 10rem);
    font-weight: 300;
    letter-spacing: 0.05em;
    margin: var(--space-md) 0 var(--space-xs);
    line-height: 1;
}
.hero .subtitle {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

/* 2. Intro Section */
.intro p {
    margin-bottom: var(--space-md);
}

/* 3. Message Section */
.message-body p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

/* 4. Photo Gallery */
.gallery-container {
    column-count: 3;
    column-gap: var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.gallery-item {
    position: relative;
    cursor: pointer;
    overflow: hidden;
    border-radius: 2px;
    break-inside: avoid;
    margin-bottom: var(--space-md);
}

.gallery-item img {
    width: 100%;
    display: block;
    object-fit: cover;
    transform: scale(1.15); /* Base scale for parallax */
    background-color: var(--bg-darker);
    filter: grayscale(80%) sepia(30%) contrast(1.1); /* Nostalgic faded look */
    transition: filter var(--transition-slow);
}

.gallery-item:hover img {
    filter: grayscale(0%) sepia(0%) contrast(1) !important;
}

.gallery-item .caption {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    padding: var(--space-sm);
    background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
    color: #fff;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1rem;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gallery-item:hover .caption {
    opacity: 1;
}

/* Kuromi Decoration */
.kuromi-deco {
    width: 120px;
    height: auto;
    margin: var(--space-lg) auto 0;
    display: block;
    cursor: pointer;
    animation: float-kuromi 3s ease-in-out infinite;
    filter: drop-shadow(0 0 15px var(--accent-glow));
    transition: transform var(--transition-fast);
}
.kuromi-deco:active {
    transform: scale(0.9) !important;
}
@keyframes float-kuromi {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-15px) rotate(5deg); }
}

/* Kuromi Secret Toast */
.secret-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(50px);
    background: var(--bg-darker);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.5), 0 0 15px var(--accent-glow);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    text-align: center;
    font-size: 0.9rem;
}
.secret-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Cursor Sparkles */
.cursor-spark {
    position: fixed;
    width: 4px; height: 4px;
    background: var(--accent);
    border-radius: 50%;
    pointer-events: none;
    z-index: 99999;
    box-shadow: 0 0 10px var(--accent-glow), 0 0 5px var(--accent);
    animation: spark-fade 0.8s ease-out forwards;
}
@keyframes spark-fade {
    0% { transform: scale(1) translateY(0); opacity: 1; }
    100% { transform: scale(0) translateY(-25px); opacity: 0; }
}

/* 5. Little Things */
.things-list {
    list-style: none;
    margin-top: var(--space-md);
}
.things-list li {
    font-size: 1.2rem;
    color: var(--text-secondary);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* 6. Timeline */
.timeline-container {
    margin-top: var(--space-lg);
    border-left: 1px solid var(--accent);
    padding-left: var(--space-md);
}
.timeline-item {
    margin-bottom: var(--space-lg);
    position: relative;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(var(--space-md) * -1 - 4px);
    top: 6px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background-color: var(--text-primary);
}
.timeline-item .year {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
}
.timeline-item p {
    font-size: 1.2rem;
    font-style: italic;
}

/* 7. The Letter */
.letter-content {
    background-color: var(--bg-darker);
    padding: var(--space-lg) var(--space-xl);
    border-radius: 4px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}
.section-label {
    margin-bottom: var(--space-xl);
    text-align: center;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.75rem;
    font-weight: 400;
}
.letter-body p {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}
.letter-body .salutation {
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
}
.letter-body .signoff {
    margin-top: var(--space-xl);
    font-style: italic;
}

/* 8. Final Message */
.final {
    background-color: #1a1918;
    color: var(--bg-color);
    transition: background-color 2s ease;
}
.final .text-secondary {
    color: rgba(255,255,255,0.5);
}

/* ==========================================================================
   LIGHTBOX
   ========================================================================== */
.lightbox {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--lightbox-bg);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    backdrop-filter: blur(10px);
}
.lightbox.active {
    opacity: 1;
    visibility: visible;
}
.lightbox-close {
    position: absolute;
    top: 2rem; right: 2rem;
    background: transparent;
    border: none;
    color: #fff;
    cursor: pointer;
    z-index: 10001;
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}
.lightbox-close:hover {
    opacity: 1;
}
.lightbox-content-wrapper {
    max-width: 90vw;
    max-height: 85vh;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.lightbox-img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}
.lightbox-caption {
    color: rgba(255,255,255,0.8);
    margin-top: 1rem;
    font-style: italic;
    font-size: 1.1rem;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
    text-align: center;
    padding: var(--space-xl) var(--space-md) var(--space-md);
    margin-top: var(--space-xxl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.site-footer p {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    text-transform: uppercase;
    opacity: 1;
    font-weight: 600;
}

/* Scrolling Text in Hero */
.name.display-title {
    font-family: var(--font-serif);
    font-size: 5rem;
    letter-spacing: 0.1em;
    margin: var(--space-sm) 0;
    line-height: 1;
}

.heartbeat-text {
    animation: heartbeat-glow 3s ease-in-out infinite;
}
@keyframes heartbeat-glow {
    0%, 100% { text-shadow: 0 0 10px rgba(215, 148, 246, 0.1); }
    50% { text-shadow: 0 0 25px rgba(215, 148, 246, 0.6), 0 0 45px rgba(215, 148, 246, 0.2); }
}

/* ==========================================================================
   ANIMATIONS (Scroll Reveal)
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    filter: blur(8px);
    transition: opacity var(--transition-slow), transform var(--transition-slow), filter var(--transition-slow);
    will-change: opacity, transform, filter;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}
.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }
.delay-4 { transition-delay: 0.8s; }
.delay-5 { transition-delay: 1.0s; }
.delay-6 { transition-delay: 1.2s; }
.delay-7 { transition-delay: 1.4s; }
.delay-8 { transition-delay: 1.6s; }

/* ==========================================================================
   CINEMATIC OPENING OVERLAY
   ========================================================================== */
.opening-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background-color: var(--bg-color);
    z-index: 99999;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-primary);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
    cursor: pointer;
}
.opening-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}
.opening-content p:first-child {
    font-size: 2rem;
    font-style: italic;
    opacity: 0;
    animation: fade-in-up 2s ease forwards 0.5s;
}
.tap-hint {
    opacity: 0;
    animation: fade-in-pulse 2s ease-in-out infinite alternate 2s;
}
@keyframes fade-in-up {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in-pulse {
    from { opacity: 0.3; }
    to { opacity: 1; }
}

/* ==========================================================================
   MEDIA QUERIES (Responsive)
   ========================================================================== */
/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ==========================================================================
   RESPONSIVE DESIGN (Mobile First considerations applied backward)
   ========================================================================== */
@media screen and (max-width: 1024px) {
    .gallery-container {
        column-count: 2;
        column-gap: var(--space-sm);
    }
    .letter-content {
        padding: var(--space-lg) var(--space-md);
    }
}

@media screen and (max-width: 768px) {
    :root {
        --space-xl: 5rem;
        --space-xxl: 8rem;
    }
    .hero .display-title {
        font-size: clamp(3.5rem, 20vw, 6rem);
    }
    .section-title {
        font-size: 2rem;
    }
    .large-text {
        font-size: 1.25rem;
    }
    .gallery-container {
        column-count: 2; /* Pinterest style masonry on mobile */
        column-gap: 0.5rem;
    }
    .gallery-item {
        margin-bottom: 0.5rem;
        border-radius: 6px;
    }
    .gallery-item:last-child {
        margin-bottom: 0.5rem;
    }
    .kuromi-deco {
        width: 90px; /* Slightly smaller on mobile */
    }
    .letter-content {
        padding: var(--space-md) var(--space-sm); /* Tighter letter on mobile */
    }
    .music-btn {
        bottom: 1.5rem; right: 1.5rem;
    }
    .timeline-container {
        padding-left: var(--space-sm);
    }
    .timeline-item::before {
        left: calc(var(--space-sm) * -1 - 4px);
    }
}