:root {
    --bg-paper: #FDFBF7;
    --bg-footer: #F5F2EB;
    --ink-main: #2C2C2C;
    --ink-muted: rgba(44, 44, 44, 0.6);
    --ink-wash: rgba(44, 44, 44, 0.15);
    
    --accent-red: #DA2C38;
    --accent-green: #4A7C59;
    --kintsugi-gold: #D4AF37;
    
    --font-serif: 'Cormorant Garamond', serif;
    --font-sans: 'Inter', sans-serif;
    --font-kanji: 'Noto Serif JP', serif;
    
    --nav-height: 70px;
}

body.dark-theme {
    --bg-paper: #121212;
    --bg-footer: #1A1A1A;
    --ink-main: #F4F4F4;
    --ink-muted: rgba(244, 244, 244, 0.6);
    --ink-wash: rgba(244, 244, 244, 0.15);
    --kintsugi-gold: #E5C158;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-paper);
    color: var(--ink-main);
    font-family: var(--font-sans);
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.5s ease;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    pointer-events: none;
    z-index: -2;
    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='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
    transition: filter 0.5s ease, opacity 0.5s ease;
}

body.dark-theme::before {
    filter: invert(1);
    opacity: 0.05;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(253, 251, 247, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--ink-wash);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4vw;
    z-index: 100;
    transition: background-color 0.5s ease, border-color 0.5s ease;
}

body.dark-theme header {
    background-color: rgba(18, 18, 18, 0.95);
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.hanko-stamp {
    width: 24px;
    height: 24px;
    background-color: var(--accent-red);
    border-radius: 2px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hanko-stamp::after {
    content: '印';
    color: #FDFBF7;
    font-family: var(--font-kanji);
    font-size: 14px;
    font-weight: 200;
    opacity: 0.9;
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 24px;
}

.header-meta {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--ink-muted);
    text-transform: uppercase;
    transition: color 0.5s ease;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--ink-main);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, color 0.3s ease;
}

.theme-toggle:hover {
    color: var(--accent-red);
}

body.dark-theme .theme-toggle {
    font-size: 1.2rem;
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 100vh;
    padding-top: var(--nav-height);
    position: relative;
}

.kintsugi-divider {
    position: absolute;
    top: var(--nav-height);
    bottom: 0;
    left: 50%;
    width: 1px;
    background: linear-gradient(to bottom, transparent 0%, var(--kintsugi-gold) 15%, var(--kintsugi-gold) 85%, transparent 100%);
    transform: translateX(-50%);
    z-index: 10;
    opacity: 0.6;
    transition: background 0.5s ease;
}

.kintsugi-mobile-divider {
    display: none;
}

.column {
    position: relative;
    padding: 8vw 6vw 10vw 8vw;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.col-left { padding-right: 8vw; }
.col-right { padding-left: 8vw; padding-right: 6vw; }

.watermark {
    position: absolute;
    top: 15vh;
    font-family: var(--font-kanji);
    font-size: 45vw;
    line-height: 1;
    color: var(--ink-main);
    opacity: 0.02;
    z-index: -1;
    user-select: none;
    pointer-events: none;
    will-change: transform;
    transition: color 0.5s ease;
}

body.dark-theme .watermark {
    opacity: 0.03;
}

.col-left .watermark { right: -5vw; }
.col-right .watermark { left: -5vw; }

.tategaki-label {
    position: absolute;
    left: 3vw;
    top: 10vw;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-serif);
    font-size: 0.9rem;
    letter-spacing: 0.3em;
    color: var(--ink-muted);
    transition: color 0.5s ease;
}

.col-right .tategaki-label {
    left: auto;
    right: 3vw;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 4.5rem;
    font-weight: 400;
    line-height: 0.9;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    color: var(--ink-main);
    transition: color 0.5s ease;
}

.hero-subtitle {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    color: var(--ink-muted);
    text-transform: uppercase;
    margin-bottom: 4rem;
    transition: color 0.5s ease;
}

.card {
    border: 1px solid var(--ink-wash);
    padding: 2.5rem;
    background: transparent;
    position: relative;
    transition: border-color 0.4s ease, transform 0.4s ease, box-shadow 0.4s ease;
}

.card::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px;
    width: 8px; height: 8px;
    border-top: 1px solid transparent;
    border-left: 1px solid transparent;
    transition: all 0.4s ease;
}

.col-left .card:hover { border-color: rgba(218, 44, 56, 0.3); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(0,0,0,0.02); }
.col-left .card:hover::before { border-color: var(--accent-red); width: 24px; height: 24px; }

.col-right .card:hover { border-color: rgba(74, 124, 89, 0.3); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(0,0,0,0.02); }
.col-right .card:hover::before { border-color: var(--accent-green); width: 24px; height: 24px; }

body.dark-theme .col-left .card:hover { box-shadow: 0 10px 30px rgba(0,0,0,0.2); border-color: rgba(218, 44, 56, 0.5); }
body.dark-theme .col-right .card:hover { box-shadow: 0 10px 30px rgba(0,0,0,0.2); border-color: rgba(74, 124, 89, 0.5); }

.card-title {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-style: italic;
    margin-bottom: 1.2rem;
    color: var(--ink-main);
    transition: color 0.5s ease;
}

.card p {
    font-size: 0.95rem;
    color: var(--ink-muted);
    margin-bottom: 1rem;
    transition: color 0.5s ease;
}

.card p:last-child { margin-bottom: 0; }

.card ul {
    list-style: none;
    margin-top: 1rem;
}

.card li {
    position: relative;
    padding-left: 1.5rem;
    font-size: 0.95rem;
    color: var(--ink-muted);
    margin-bottom: 0.8rem;
    transition: color 0.5s ease;
}

.card li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--ink-wash);
    transition: color 0.5s ease;
}

.card.bullets li::before {
    content: '•';
    font-size: 1.2rem;
    line-height: 1.2;
}

.action-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-decoration: none;
    color: var(--ink-main);
    transition: opacity 0.3s ease, color 0.5s ease;
}

.action-link:hover { opacity: 0.6; }
.action-link .arrow { color: var(--accent-red); font-family: serif; }

footer {
    background-color: var(--bg-footer);
    padding: 8vw 4vw;
    text-align: center;
    border-top: 1px solid var(--ink-wash);
    position: relative;
    transition: background-color 0.5s ease, border-color 0.5s ease;
}

.footer-content { max-width: 600px; margin: 0 auto; }

.footer-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
    transition: color 0.5s ease;
}

.footer-text {
    font-size: 1rem;
    color: var(--ink-muted);
    margin-bottom: 3rem;
    transition: color 0.5s ease;
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 4rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 1rem 2.5rem;
    border: 1px solid var(--ink-wash);
    background: transparent;
    color: var(--ink-main);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: -1;
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-red:hover { color: #FDFBF7; border-color: var(--accent-red); }
.btn-red::before { background-color: var(--accent-red); }
.btn-red:hover::before { transform: scaleY(1); }

.btn-green:hover { color: #FDFBF7; border-color: var(--accent-green); }
.btn-green::before { background-color: var(--accent-green); }
.btn-green:hover::before { transform: scaleY(1); }

.copyright {
    font-size: 0.75rem;
    color: var(--ink-wash);
    letter-spacing: 0.1em;
    font-family: var(--font-sans);
    transition: color 0.5s ease;
}

.animate-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

@media (max-width: 1024px) {
    .hero-title { font-size: 3.5rem; }
    .watermark { font-size: 55vw; }
}

@media (max-width: 768px) {
    .header-meta { display: none; }
    .header-controls { gap: 0; }
    
    main {
        grid-template-columns: 1fr;
    }

    .kintsugi-divider { display: none; }

    .kintsugi-mobile-divider {
        display: block;
        width: 80%;
        height: 1px;
        background: linear-gradient(to right, transparent 0%, var(--kintsugi-gold) 50%, transparent 100%);
        margin: 0 auto;
        opacity: 0.6;
        transition: background 0.5s ease;
    }

    .column {
        padding: 15vw 6vw;
    }

    .col-left, .col-right {
        padding-right: 6vw;
        padding-left: 6vw;
    }

    .tategaki-label, .col-right .tategaki-label {
        position: relative;
        left: 0; right: 0; top: 0;
        writing-mode: horizontal-tb;
        text-orientation: unset;
        margin-bottom: 2rem;
        display: inline-block;
        border-bottom: 1px solid var(--ink-wash);
        padding-bottom: 0.5rem;
        transition: color 0.5s ease, border-color 0.5s ease;
    }

    .watermark {
        font-size: 80vw;
        top: 5vh;
        left: 50% !important;
        right: auto !important;
        transform: translateX(-50%) !important;
    }

    .hero-title { font-size: 3rem; }
    .hero-subtitle { margin-bottom: 2.5rem; }

    .card { padding: 1.8rem; }
    
    .button-group {
        flex-direction: column;
        gap: 1rem;
        padding: 0 4vw;
    }

    .btn { width: 100%; }
}