:root {
    /* Color Palette */
    --color-bg: #f7f6f2;
    /* Off-white / Washi paper */
    --color-text: #2c2c2c;
    /* Sumi Ink */
    --color-accent-tech: #5e8c95;
    /* Sabi-Asagi (Rusty Blue-Green) */
    --color-accent-warm: #d99058;
    /* Kitsune (Fox Color) */
    --color-border: #e0ded5;

    /* Typography */
    --font-heading: 'Shippori Mincho', serif;
    --font-body: 'Noto Sans JP', sans-serif;
    --font-code: 'Fira Code', monospace;

    /* Text Colors */
    --text-primary: #2c2c2c;
    --text-secondary: #555;
    --text-muted: #666;
    --text-light: #777;

    /* Backgrounds */
    --bg-card: #fff;
    --bg-section: rgba(255, 255, 255, 0.5);
    --bg-featured: #fff;

    /* Spacing Helpers */
    --transition: 0.3s ease;
}

/* ==================== Dark Mode (Warm Dark) ==================== */
body.dark-mode {
    --color-bg: #2c2b2a;
    --color-text: #e0ded5;
    --color-border: #4a4744;
    --highlight: rgba(217, 144, 88, 0.15);

    /* Dark mode text colors - improved contrast */
    --text-primary: #e0ded5;
    --text-secondary: #c5c0ba;
    --text-muted: #b5b0ab;
    --text-light: #9a958f;

    /* Dark mode backgrounds */
    --bg-card: #363432;
    --bg-section: rgba(44, 43, 42, 0.5);
    --bg-featured: #363432;
}

body.dark-mode .bg-texture {
    opacity: 0.15;
    filter: invert(1);
}

body.dark-mode .logo img {
    mix-blend-mode: screen;
    filter: brightness(1.1);
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Washi Texture Overlay */
.bg-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0IiBoZWlnaHQ9IjQiPgo8cmVjdCB3aWR0aD0iNCIgaGVpZ2h0PSI0IiBmaWxsPSIjZjdmNmYyIi8+CjxwYXRoIGQ9Ik0xIDNoMXYxSDFWM3ptMiAxaDF2MUgzVjR6IiBmaWxsPSIjZDZkM2NlIiBmaWxsLW9wYWNpdHk9IjAuMSIvPgo8L3N2Zz4=');
    /* Subtle noise */
    pointer-events: none;
    z-index: -1;
    opacity: 0.5;
}

a {
    color: var(--color-accent-tech);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-accent-warm);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.site-header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-code);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.05em;
    color: var(--color-text);
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: inherit;
    text-decoration: none;
    transition: opacity 0.3s;
}

.logo a:hover {
    opacity: 0.8;
}

.logo img {
    height: 48px;
    width: auto;
    mix-blend-mode: multiply;
}

.site-nav {
    display: flex;
    gap: 1.5rem;
}

.site-nav a {
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: var(--color-text);
    position: relative;
}

.site-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -4px;
    left: 0;
    background-color: var(--color-accent-warm);
    transition: width 0.3s ease;
}

.site-nav a:hover::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition);
    margin-left: 1rem;
}

.theme-toggle:hover {
    border-color: var(--color-accent-tech);
    background-color: var(--highlight);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-content {
    flex: 1;
    z-index: 10;
}

.hero-label {
    font-family: var(--font-code);
    color: var(--color-accent-tech);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: 0.05em;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 350px;
    height: auto;
    z-index: 1;
}

.hero-character-img {
    width: 100%;
    height: auto;
    animation: float 6s ease-in-out infinite;
    filter: drop-shadow(0 10px 20px rgba(94, 140, 149, 0.2));
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }

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

/* Featured Section (Z-Pattern) */
.featured-section {
    padding: 6rem 0;
    position: relative;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0) 0%, rgba(94, 140, 149, 0.05) 100%);
    /* Subtle diagonal */
}

.featured-container {
    display: flex;
    align-items: center;
    gap: 4rem;
    padding: 2rem;
    border: 1px solid var(--color-border);
    background: var(--bg-featured);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
    border-radius: 4px;
    /* Slight roundness */
}

.featured-visual {
    flex: 0 0 150px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.flask-icon {
    font-size: 5rem;
    color: var(--color-accent-tech);
    position: relative;
}

.flask-bubble {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--color-accent-warm);
    border-radius: 50%;
    top: -10px;
    right: 10px;
    animation: bubble 2s infinite ease-in-out;
}

.flask-bubble:nth-child(2) {
    width: 6px;
    height: 6px;
    top: -20px;
    right: 20px;
    animation-delay: 1s;
}

@keyframes bubble {
    0% {
        transform: translateY(0);
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        transform: translateY(-20px);
        opacity: 0;
    }
}

.featured-content {
    flex: 1;
    text-align: left;
    /* Explicitly left-aligned */
}

.featured-label {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--color-accent-warm);
    letter-spacing: 0.1em;
    margin-bottom: 0.8rem;
    display: inline-block;
    border-bottom: 1px solid var(--color-accent-warm);
}

.featured-content h2 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.featured-content p {
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    background: var(--color-text);
    color: #fff;
    padding: 1rem 2.5rem;
    font-family: var(--font-code);
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-primary:hover {
    background: var(--color-accent-tech);
    transform: translateX(5px);
    /* Arrow movement hint */
}

.icon-arrow {
    transition: transform 0.3s ease;
}

.btn-primary:hover .icon-arrow {
    transform: translateX(5px);
}

/* Responsive adjustment for Z-pattern */
@media (max-width: 768px) {
    .featured-container {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }

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

    .btn-primary:hover {
        transform: none;
    }
}

/* Areas Section */
.areas-section {
    padding: 4rem 0;
    background: rgba(255, 255, 255, 0.4);
}

.section-title {
    font-family: var(--font-code);
    text-align: center;
    margin-bottom: 3rem;
    font-size: 1.5rem;
    color: var(--color-text);
}

.grid-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.area-card {
    background: var(--bg-card);
    padding: 2rem;
    border: 1px solid var(--color-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.area-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.area-icon {
    font-size: 2rem;
    color: var(--color-accent-tech);
    margin-bottom: 1rem;
}

.area-card h3 {
    font-family: var(--font-code);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.area-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    height: 3em;
    /* Align cards */
}

.area-links {
    list-style: none;
}

.area-links li {
    margin-bottom: 0.5rem;
}

.area-links a {
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.3rem 0;
    border-bottom: 1px dashed var(--color-border);
}

.area-links a small {
    font-family: var(--font-code);
    font-size: 0.7rem;
    color: #aaa;
}

/* Footer */
.site-footer {
    padding: 3rem 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    margin-top: 4rem;
}

.site-footer p {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: #888;
}

/* ==================== Hub & Structure Reform ==================== */

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

.hub-hero {
    padding: 8rem 0 4rem;
    background: radial-gradient(circle at top right, rgba(94, 140, 149, 0.1), transparent);
}

.hub-navigation {
    padding: 2rem 0 4rem;
}

.grid-hub {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.hub-card {
    display: flex;
    gap: 1.5rem;
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    overflow: hidden;
}

.hub-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    transition: width 0.3s ease;
    z-index: 0;
}

.lab-card::before {
    background-color: var(--color-accent-tech);
}

.outcome-card::before {
    background-color: var(--color-accent-warm);
}

.hub-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.hub-card:hover::before {
    width: 8px;
}

.hub-icon {
    font-size: 2.5rem;
    color: var(--color-accent-tech);
    flex-shrink: 0;
    z-index: 1;
}

.outcome-card .hub-icon {
    color: var(--color-accent-warm);
}

.hub-text {
    z-index: 1;
}

.hub-text h3 {
    font-family: var(--font-code);
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.hub-text h3 small {
    font-size: 0.8rem;
    opacity: 0.5;
    font-weight: 400;
}

.hub-text p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.hub-cta {
    font-family: var(--font-code);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 2px;
    transition: border-color 0.3s;
}

.hub-card:hover .hub-cta {
    border-color: var(--color-accent-tech);
}

.outcome-card:hover .hub-cta {
    border-color: var(--color-accent-warm);
}

/* Outcome Details */
.outcome-details {
    padding: 6rem 0;
    background: var(--bg-section);
    border-top: 1px solid var(--color-border);
}

.outcome-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

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

.outcome-item i {
    font-size: 2.5rem;
    color: var(--color-accent-warm);
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.outcome-item h4 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.outcome-item p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Secret Ops */
.secret-ops {
    padding: 4rem 0;
    opacity: 0.3;
    transition: opacity 0.3s;
}

.secret-ops:hover {
    opacity: 1;
}

.admin-link {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--color-text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid transparent;
}

.admin-link:hover {
    border-color: var(--color-border);
    background: var(--bg-card);
}

/* Responsive */
@media (max-width: 768px) {
    .grid-hub {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .site-nav {
        display: none;
        /* TODO: Mobile Menu */
    }
}