:root {
    --bg-color: #faf9f6; /* Warm, elegant alabaster white */
    --text-primary: #1c1917; /* Deep stone grey */
    --text-secondary: #78716c; /* Warm secondary text */
    --accent-color: #b45309; /* Warm amber */
    --border-color: #e7e5e4;
    --badge-bg: rgba(0, 0, 0, 0.02);
    --card-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.03), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    --toggle-hover: #f0eee9;
    --card-bg: #ffffff;
    --mono-bg: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] {
    --bg-color: #141416; /* Deep obsidian / warm charcoal */
    --text-primary: #f4f4f5; /* Off-white */
    --text-secondary: #a1a1aa; /* Muted cool grey */
    --accent-color: #f59e0b; /* Bright warm amber */
    --border-color: #27272a;
    --badge-bg: rgba(255, 255, 255, 0.03);
    --card-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --toggle-hover: #27272a;
    --card-bg: #1a1a1e;
    --mono-bg: rgba(255, 255, 255, 0.04);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    min-height: 100vh;
    padding: 3rem 2.5rem;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.25s ease, color 0.25s ease;
}

header,
.main-container,
.subpage-container,
footer {
    width: 100%;
    max-width: 68rem;
}

/* Header & Navigation */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.25s ease;
}

.brand-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-link {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    line-height: 1;
    transition: color 0.2s ease;
}

.brand-link:hover {
    color: var(--accent-color);
}

.nav-btn,
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    width: 36px;
    height: 36px;
    padding: 0;
    color: var(--text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.nav-btn:hover,
.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background-color: var(--toggle-hover);
}

.contrast-glyph {
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
}

[data-theme="dark"] .contrast-glyph {
    transform: rotate(180deg);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.75rem;
}

.nav-link {
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-secondary);
    padding: 0.35rem 0;
    position: relative;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--text-primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
    border-radius: 1px;
}

/* Home / Hero Layout */
.main-container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 6rem;
    margin: auto 0;
    padding: 3rem 0;
    align-items: center;
}

.content {
    max-width: 34rem;
}

h1 {
    font-family: Garamond, Baskerville, "Baskerville Old Face", "Hoefler Text", "Times New Roman", serif;
    font-size: 3.5rem;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.tagline {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-color);
    margin-bottom: 1.75rem;
    line-height: 1.5;
}

.description {
    font-size: 1.125rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

.draft-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    background-color: var(--badge-bg);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.85rem;
    border-radius: 0.375rem;
    margin-top: 2.25rem;
}

.draft-bracket {
    color: var(--accent-color);
    font-weight: 600;
}

.visual-container {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 1.5rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.visual-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Sub-Page Layout */
.subpage-container {
    margin: auto 0;
    padding: 3.5rem 0;
    max-width: 52rem;
}

.subpage-header {
    margin-bottom: 3rem;
}

.subpage-title {
    font-family: Garamond, Baskerville, "Baskerville Old Face", "Hoefler Text", "Times New Roman", serif;
    font-size: 2.75rem;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.subpage-subtitle {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-color);
}

.subpage-body {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.section-block {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.section-text {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Cards & Lists */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: border-color 0.2s ease;
}

.card:hover {
    border-color: var(--text-secondary);
}

.card-num {
    font-family: ui-monospace, monospace;
    font-size: 0.75rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-heading {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.9375rem;
    line-height: 1.55;
    color: var(--text-secondary);
}

/* Monospace Info Blocks & Keys */
.mono-box {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8125rem;
    line-height: 1.6;
    background-color: var(--mono-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.25rem;
    color: var(--text-primary);
    overflow-x: auto;
}

.mono-label {
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.35rem;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Footer */
footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    transition: border-color 0.25s ease;
}

/* Responsive Breakpoints */
@media (max-width: 960px) {
    body {
        padding: 2.5rem 1.75rem;
    }
    header {
        flex-wrap: wrap;
        gap: 1rem;
    }
    .nav-links {
        order: 3;
        width: 100%;
        gap: 1.25rem;
        padding-top: 0.5rem;
        overflow-x: auto;
    }
    .main-container {
        grid-template-columns: 1fr;
        gap: 3.5rem;
        padding: 2.5rem 0;
    }
    .content {
        max-width: 100%;
    }
    .visual-container {
        max-width: 22rem;
    }
}

@media (max-width: 640px) {
    body {
        padding: 2rem 1.25rem;
    }
    h1 {
        font-size: 2.5rem;
    }
    .subpage-title {
        font-size: 2.15rem;
    }
    .tagline {
        font-size: 0.7rem;
        margin-bottom: 1.25rem;
    }
    .description {
        font-size: 1.05rem;
    }
    .nav-links {
        gap: 1rem;
        font-size: 0.75rem;
    }
    footer {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
}