/* ============================================================
   LAYER-2.WIKI STYLES
   ============================================================
   Minimalist technical wiki aesthetic: 1970s IBM manual meets
   Swiss railway timetable rendered through digital lens.
   ============================================================ */

/* ============================================================
   ROOT & GLOBAL STYLES
   ============================================================ */

:root {
    /* Primary Palette */
    --color-dark-primary: #1A1A1A;
    --color-dark-secondary: #0A0A0A;
    --color-light-primary: #F0F0F0;
    --color-light-secondary: #FAFAFA;
    --color-accent-hot: #FF0044;
    --color-accent-cyan: #00FFFF;
    --color-text-muted: #666666;
    --color-border: #D0D0D0;
    --color-link: #333333;

    /* Typography */
    --font-body: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Sizing */
    --body-font-size: clamp(1rem, 1.1vw, 1.125rem);
    --line-height-body: 1.72;
    --letter-spacing-body: 0.005em;
    --max-content-width: 68ch;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Layout Grid */
    --sidebar-width: 16rem;
    --marginal-width: 12rem;
    --content-width: auto;
}

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

html {
    background-color: var(--color-light-primary);
    color: var(--color-dark-primary);
}

body {
    font-family: var(--font-body);
    font-size: var(--body-font-size);
    line-height: var(--line-height-body);
    letter-spacing: var(--letter-spacing-body);
    background-color: var(--color-light-primary);
    color: var(--color-dark-primary);
    overflow-x: hidden;
}

/* ============================================================
   PAGE LAYOUT - F-PATTERN ARCHITECTURE
   ============================================================ */

.page-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr var(--marginal-width);
    gap: 0;
    min-height: 100vh;
    background-color: var(--color-light-primary);
}

/* ============================================================
   SIDEBAR NAVIGATION
   ============================================================ */

.sidebar {
    background-color: var(--color-light-secondary);
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-xl) var(--spacing-md);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    font-size: 0.95rem;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.nav-section {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-lg);
}

.nav-section:last-child {
    border-bottom: none;
}

.nav-title {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    display: block;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-list a {
    color: var(--color-dark-primary);
    text-decoration: none;
    position: relative;
    display: inline-block;
    transition: color 0.2s ease;
}

.nav-list a:hover {
    color: var(--color-accent-hot);
}

.nav-list a::before {
    content: '→ ';
    opacity: 0;
    transition: opacity 0.2s ease;
    margin-right: var(--spacing-xs);
}

.nav-list a:hover::before {
    opacity: 1;
}

/* ============================================================
   MAIN CONTENT AREA
   ============================================================ */

main.content {
    background-color: var(--color-light-primary);
    padding: var(--spacing-xl) var(--spacing-lg);
    max-width: none;
}

/* ============================================================
   MASTHEAD
   ============================================================ */

.masthead {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-dark-primary);
}

.masthead-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.masthead-title {
    font-family: var(--font-body);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: 0.15em;
    line-height: 1.1;
    color: var(--color-dark-primary);
}

.masthead-subtitle {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-muted);
    max-width: var(--max-content-width);
    line-height: var(--line-height-body);
}

.masthead-divider {
    width: 2rem;
    height: 3px;
    background-color: var(--color-accent-hot);
    margin-top: var(--spacing-md);
}

/* ============================================================
   CONTENT SECTIONS
   ============================================================ */

.intro-section,
.content-section {
    margin-bottom: var(--spacing-xl);
    max-width: var(--max-content-width);
}

.intro-section h2,
.content-section h2 {
    font-family: var(--font-body);
    font-size: clamp(1.5rem, 2.2vw, 1.75rem);
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--color-dark-primary);
    line-height: 1.3;
}

.intro-section p,
.content-section p {
    margin-bottom: var(--spacing-md);
    color: var(--color-dark-primary);
    max-width: var(--max-content-width);
}

.intro-section p:last-child,
.content-section p:last-child {
    margin-bottom: var(--spacing-lg);
}

h3 {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
    color: var(--color-dark-primary);
}

/* ============================================================
   SECTION HEADER WITH TYPE LABEL
   ============================================================ */

.section-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.section-type {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent-hot);
    white-space: nowrap;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-accent-hot);
    background-color: rgba(255, 0, 68, 0.05);
}

/* ============================================================
   DIAGRAMS
   ============================================================ */

.diagram-placeholder {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background-color: var(--color-light-secondary);
    border: 1px solid var(--color-border);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.diagram-svg {
    width: 100%;
    max-width: 500px;
    height: auto;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ============================================================
   PERFORMANCE TABLE
   ============================================================ */

.performance-table {
    margin: var(--spacing-lg) 0;
    border: 1px solid var(--color-border);
    background-color: var(--color-light-secondary);
    overflow: hidden;
}

.table-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-bottom: 1px solid var(--color-border);
}

.table-row:last-child {
    border-bottom: none;
}

.table-row.table-header {
    background-color: var(--color-dark-primary);
    color: var(--color-light-primary);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.table-cell {
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
}

.table-row:nth-child(odd):not(.table-header) {
    background-color: rgba(0, 255, 255, 0.02);
}

/* ============================================================
   MARGINAL RAIL (RIGHT SIDE)
   ============================================================ */

.marginal-rail {
    background-color: var(--color-light-secondary);
    border-left: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-md);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    font-size: 0.85rem;
}

.marginal-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.marginal-item {
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    opacity: 0.6;
    transition: opacity 0.3s ease, color 0.3s ease;
    scroll-behavior: smooth;
}

.marginal-item:last-child {
    border-bottom: none;
}

.marginal-item.active {
    opacity: 1;
    color: var(--color-accent-hot);
}

.marginal-item h4 {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
    color: var(--color-dark-primary);
    transition: color 0.3s ease;
}

.marginal-item.active h4 {
    color: var(--color-accent-hot);
}

.marginal-item p {
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================================
   FOOTER
   ============================================================ */

.content-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    max-width: var(--max-content-width);
}

.content-footer p {
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-body);
}

.footer-divider {
    margin: var(--spacing-md) 0;
    opacity: 0.5;
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

/* ============================================================
   SCROLLBAR CUSTOMIZATION
   ============================================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-light-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ============================================================
   PRINT STYLES
   ============================================================ */

@media print {
    .sidebar,
    .marginal-rail {
        display: none;
    }

    .page-container {
        grid-template-columns: 1fr;
    }

    body {
        font-size: 11pt;
        line-height: 1.6;
        color: #000;
    }

    a {
        color: #000;
        text-decoration: none;
    }
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

@media (max-width: 1400px) {
    .page-container {
        grid-template-columns: 1fr var(--marginal-width);
    }

    .sidebar {
        display: none;
    }
}

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 14rem;
        --marginal-width: 10rem;
    }

    main.content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .page-container {
        grid-template-columns: 1fr;
    }

    .sidebar,
    .marginal-rail {
        display: none;
    }

    main.content {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .masthead-title {
        font-size: clamp(1.5rem, 3vw, 2rem);
    }

    .intro-section h2,
    .content-section h2 {
        font-size: clamp(1.25rem, 1.8vw, 1.5rem);
    }

    h3 {
        font-size: 1rem;
    }

    .performance-table {
        font-size: 0.8rem;
    }

    .table-cell {
        padding: var(--spacing-sm);
    }

    .diagram-placeholder {
        min-height: 150px;
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    main.content {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .masthead {
        margin-bottom: var(--spacing-lg);
        padding-bottom: var(--spacing-md);
    }

    .masthead-title {
        font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    }

    .intro-section h2,
    .content-section h2 {
        font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    }

    h3 {
        font-size: 0.95rem;
        margin-top: var(--spacing-md);
    }

    .table-row {
        grid-template-columns: 1fr;
    }

    .performance-table {
        font-size: 0.75rem;
    }

    .masthead-subtitle {
        font-size: 0.9rem;
    }
}

/* ============================================================
   GLITCH ANIMATIONS
   ============================================================ */

@keyframes glitch-shift {
    0% { transform: translateX(0px); }
    25% { transform: translateX(2px); }
    50% { transform: translateX(-1px); }
    75% { transform: translateX(3px); }
    100% { transform: translateX(0px); }
}

@keyframes glitch-clip {
    0% {
        clip-path: inset(0 0 0 0);
        opacity: 1;
    }
    20% {
        clip-path: inset(10% 0 60% 0);
        opacity: 0.8;
    }
    40% {
        clip-path: inset(50% 0 20% 0);
        opacity: 0.9;
    }
    60% {
        clip-path: inset(30% 0 40% 0);
        opacity: 0.85;
    }
    80% {
        clip-path: inset(0 0 0 0);
        opacity: 1;
    }
    100% {
        clip-path: inset(0 0 0 0);
        opacity: 1;
    }
}

@keyframes glitch-cyan {
    0%, 100% {
        text-shadow: -2px 0 var(--color-accent-cyan), 0 0 transparent;
    }
    50% {
        text-shadow: -1px 0 var(--color-accent-cyan), 1px 0 transparent;
    }
}

@keyframes glitch-red {
    0%, 100% {
        text-shadow: 2px 0 var(--color-accent-hot), 0 0 transparent;
    }
    50% {
        text-shadow: 1px 0 var(--color-accent-hot), -1px 0 transparent;
    }
}

.glitch-active {
    animation: glitch-clip 0.2s ease-out, glitch-cyan 0.2s ease-out;
}

/* ============================================================
   ANIMATION & INTERACTION
   ============================================================ */

@media (prefers-reduced-motion: no-preference) {
    .nav-list a,
    .marginal-item,
    .marginal-item h4 {
        transition: all 0.2s ease;
    }

    .marginal-item {
        transition: opacity 0.3s ease, color 0.3s ease;
    }
}

/* ============================================================
   DARK MODE SUPPORT (OPTIONAL)
   ============================================================ */

@media (prefers-color-scheme: dark) {
    :root {
        --color-dark-primary: #F0F0F0;
        --color-dark-secondary: #FAFAFA;
        --color-light-primary: #0A0A0A;
        --color-light-secondary: #1A1A1A;
        --color-text-muted: #999999;
        --color-border: #2A2A2A;
    }

    html {
        background-color: var(--color-light-primary);
    }
}