/* Typography */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@200;300;400&family=Noto+Serif+JP:wght@300;400;600&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:wght,FILL@100..300,0..1&display=swap');

:root {
    /* Color Palette */
    --surface: #fbfbf9; /* Slightly brighter, more minimalist */
    --surface-bright: #ffffff;
    --surface-container-low: #f5f5f0;
    
    --primary: #102a43; /* Deeper, calmer ink blue */
    --on-primary: #ffffff;
    
    --on-surface: #1a1c19;
    --on-surface-variant: #6b7280; /* Softer grey for secondary text */
    
    --bg-dark: #121212;
    
    /* Typography */
    --font-serif: "Noto Serif JP", serif;
    --font-sans: "Manrope", sans-serif;
    
    /* Transitions - Extremely smooth and slow for rich feel */
    --transition-slow: 1.2s cubic-bezier(0.2, 0, 0, 1);
    --transition-medium: 0.6s cubic-bezier(0.2, 0, 0, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--surface);
    color: var(--on-surface);
    line-height: 1.8;
    overflow-x: hidden;
    scroll-behavior: smooth;
    font-weight: 300; /* Lighter base font weight */
}

/* Typography Utilities */
.font-serif { font-family: var(--font-serif); font-weight: 300; }
.font-sans { font-family: var(--font-sans); font-weight: 300; }

.text-center { text-align: center; }

.text-primary { color: var(--primary); }
.text-on-surface { color: var(--on-surface); }
.text-on-surface-variant { color: var(--on-surface-variant); }
.text-white { color: rgba(255, 255, 255, 0.95); } /* Slightly off-white for softness */

/* Refined Text Sizes */
.text-xs { font-size: 0.7rem; }
.text-sm { font-size: 0.85rem; }
.text-lg { font-size: 1rem; }
.text-xl { font-size: 1.15rem; }
.text-2xl { font-size: 1.35rem; }
.text-3xl { font-size: 1.75rem; }
.text-4xl { font-size: 2.5rem; }

.tracking-widest { letter-spacing: 0.25em; }
.tracking-huge { letter-spacing: 0.5em; }
.tracking-ultra { letter-spacing: 1em; }
.tracking-vision { letter-spacing: 1.5em; }

.uppercase { text-transform: uppercase; }
.leading-relaxed { line-height: 1.8; }
.leading-loose { line-height: 2.2; }

/* Backgrounds */
.bg-surface { background-color: var(--surface); }
.bg-surface-container-low { background-color: var(--surface-container-low); }
.bg-dark { background-color: var(--bg-dark); }
.bg-white { background-color: #ffffff; }

::selection {
    background-color: var(--primary);
    color: #ffffff;
}

/* Subtler texture */
.washi-texture {
    background-image: url('../assets/images/washi-texture.jpg');
    background-size: cover;
    background-attachment: fixed;
    background-blend-mode: multiply;
    opacity: 0.95; /* Subtler texture presence */
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px; /* Increased side padding for breathing room */
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-12 { gap: 4rem; } /* Expanded gaps */
.gap-24 { gap: 8rem; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }
.object-cover { object-fit: cover; }
.overflow-hidden { overflow: hidden; }

/* Increased vertical rhythm */
.py-16 { padding-top: 6rem; padding-bottom: 6rem; }
.py-32 { padding-top: 12rem; padding-bottom: 12rem; }
.py-48 { padding-top: 16rem; padding-bottom: 16rem; }
.py-64 { padding-top: 24rem; padding-bottom: 24rem; }

.mb-4 { margin-bottom: 1.5rem; }
.mb-6 { margin-bottom: 2rem; }
.mb-8 { margin-bottom: 3rem; }
.mb-12 { margin-bottom: 4rem; }
.mb-24 { margin-bottom: 8rem; }
.mt-20 { margin-top: 8rem; }

/* Components */
.nav-bar {
    top: 0;
    width: 100%;
    z-index: 50;
    background-color: transparent; /* Totally transparent by default */
    transition: background-color 1s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2.5rem 4rem; /* More spacious nav */
}

.nav-bar.scrolled {
    background-color: rgba(251, 251, 249, 0.85); /* Minimal frost */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem 4rem; /* Shrinks slightly */
}

/* Minimalist Button */
.btn-primary {
    background: transparent;
    color: var(--primary);
    padding: 0.5rem 0;
    border: none;
    border-bottom: 1px solid rgba(16, 42, 67, 0.3);
    border-radius: 0;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.65rem;
    transition: var(--transition-medium);
}

.btn-primary:hover {
    border-bottom: 1px solid rgba(16, 42, 67, 1);
    letter-spacing: 0.3em; /* expanding letter spacing on hover */
}

.nav-links { display: none; }
@media (min-width: 768px) {
    .nav-links { display: flex; align-items: center; gap: 4rem; }
}

.nav-link {
    text-decoration: none;
    color: var(--on-surface-variant);
    opacity: 0.6;
    transition: var(--transition-medium);
}
.nav-link:hover { opacity: 1; color: var(--primary); }

/* Grid Layouts - Minimalist Bento */
.bento-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem; /* More space between cards */
}

@media (min-width: 768px) {
    .bento-grid {
        grid-template-columns: repeat(12, 1fr);
    }
    
    .bento-card-large { grid-column: span 7; height: 500px;}
    .bento-card-compact { grid-column: span 5; height: 500px;}
    .bento-card-wide { grid-column: span 12; height: 400px;}
}

.bento-card {
    position: relative;
    border-radius: 0; /* Removed rounding for sharper, editorial look */
    overflow: hidden;
    cursor: pointer;
    background: transparent; /* No background */
}

.bento-card img {
    position: absolute;
    inset: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    filter: grayscale(20%) contrast(90%); /* Subtler images */
    transition: var(--transition-slow);
}

.bento-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 60%);
    opacity: 0.8;
    transition: var(--transition-slow);
}

.bento-card:hover img {
    transform: scale(1.03); /* Slower, smaller scale */
    filter: grayscale(0%) contrast(100%);
}

.bento-card:hover::after {
    opacity: 0.4; /* Let the image breathe on hover */
}

.bento-card-content {
    position: absolute;
    inset: 0;
    z-index: 10;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    transition: var(--transition-slow);
}

.bento-card:hover .bento-card-content {
    padding-bottom: 4rem; /* Lift text gently */
}

.bento-card-wide .bento-card-content {
    justify-content: center;
    align-items: center;
    text-align: center;
}
.bento-card-wide:hover .bento-card-content {
    padding-bottom: 3rem; /* reset */
    transform: translateY(-10px);
}

/* Specific Section Styles */
.hero-overlay {
    background-color: rgba(0, 0, 0, 0.4); /* Darker overlay for rich contrast */
}

/* Subtle particle field, purely white dots */
.particle-overlay {
    background-image: radial-gradient(circle at center, rgba(255, 255, 255, 0.05) 0%, transparent 60%);
}

.vertical-text {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    opacity: 0.2; /* Subtler */
    transition: var(--transition-slow);
}
.vertical-text:hover {
    opacity: 0.6;
}

/* Animations */
.animate-pulse {
    animation: slow-pulse 4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes slow-pulse {
    0%, 100% { opacity: 0.8; transform: translateY(0); }
    50% { opacity: 0.2; transform: translateY(15px); }
}

.fade-in-drift {
    animation: driftIn 4s cubic-bezier(0.2, 0, 0, 1) forwards;
}

@keyframes driftIn {
    from { opacity: 0; transform: translateY(30px); letter-spacing: 0.5em; }
    to { opacity: 1; transform: translateY(0); letter-spacing: 0; }
}

/* Minimal Petals - Restored visibility */
.petal {
    position: absolute;
    background: linear-gradient(135deg, rgba(255, 218, 233, 0.7), rgba(255, 255, 255, 0.4)); /* Soft cherry blossom pink */
    border-radius: 150% 0 150% 0; /* Petal shape */
    box-shadow: 0 2px 4px rgba(0,0,0,0.05); /* Very soft shadow to be visible on white bg */
    pointer-events: none;
    z-index: 20; /* Ensure they float above sections */
    animation: fall linear infinite;
    transform-origin: center;
}

@keyframes fall {
    0% { transform: translateY(-10vh) translateX(0) rotate(0deg) scale(0.8); opacity: 0; }
    15% { opacity: 0.8; }
    85% { opacity: 0.8; }
    100% { transform: translateY(110vh) translateX(50px) rotate(360deg) scale(1); opacity: 0; }
}

/* Footer */
footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    border-top: 1px solid rgba(0,0,0,0.05); /* very subtle line */
}
@media (min-width: 768px) {
    footer {
        flex-direction: row;
        justify-content: space-between;
    }
}