/* layer2.wiki -- Isometric Technical Wiki */

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

:root {
    --void-slate: #0D1117;
    --protocol-dark: #0F1923;
    --stratum-surface: #141E2B;
    --panel-dark: #0A0F16;
    --schema-line: #2A3A4A;
    --signal-gray: #B8C8D8;
    --muted-signal: #6A8A9A;
    --layer-blue: #4A90B8;
    --proof-cyan: #7EB8DA;
    --validity-green: #4ADE80;
    --fraud-amber: #F59E0B;
    --sequencer-violet: #8B5CF6;
    --font-display: 'IBM Plex Mono', monospace;
    --font-body: 'Inter', sans-serif;
    --font-annotation: 'Space Grotesk', sans-serif;
    --sidebar-w: 200px;
}

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
}

body {
    background: var(--void-slate);
    color: var(--signal-gray);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    line-height: 1.72;
    overflow-x: hidden;
}

/* ---- Isometric Grid Background ---- */
.iso-grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ---- Sidebar ---- */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--panel-dark);
    border-right: 1px solid var(--schema-line);
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 2rem 1rem;
    transform: translateX(-200px);
    animation: sidebarSlide 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.5s forwards;
}

@keyframes sidebarSlide {
    to { transform: translateX(0); }
}

.depth-gauge {
    width: 100%;
}

.gauge-track {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
}

.gauge-indicator {
    position: absolute;
    left: -8px;
    top: 0;
    width: 6px;
    height: 6px;
    background: var(--proof-cyan);
    transform: rotate(45deg);
    transition: top 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.gauge-tick {
    font-family: var(--font-annotation);
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    color: var(--muted-signal);
    text-decoration: none;
    padding: 0.3rem 0;
    border-left: 2px solid transparent;
    padding-left: 0.75rem;
    transition: border-color 0.2s ease, color 0.2s ease;
    display: block;
}

.gauge-tick span {
    font-family: var(--font-display);
    font-weight: 500;
    color: var(--proof-cyan);
    margin-right: 0.5rem;
}

.gauge-tick.active {
    border-left-color: var(--proof-cyan);
    color: var(--signal-gray);
}

/* ---- Main Content ---- */
.main-content {
    margin-left: var(--sidebar-w);
    position: relative;
    z-index: 1;
}

/* ---- Hero ---- */
.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem 3rem;
    scroll-snap-align: start;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(3rem, 14vw, 8rem);
    letter-spacing: 0.2em;
    color: var(--proof-cyan);
    min-height: 1.2em;
}

.hero-title .char {
    display: inline-block;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.hero-title .char.visible {
    opacity: 1;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.5rem;
    color: var(--muted-signal);
    margin-top: 1rem;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.hero-subtitle.visible {
    opacity: 1;
}

/* ---- Strata ---- */
.stratum {
    min-height: 100vh;
    padding: 4rem 3rem;
    position: relative;
    scroll-snap-align: start;
}

.stratum-0 { background: var(--void-slate); }
.stratum-1 { background: rgba(19, 26, 36, 0.92); transform: rotate(0.3deg); }
.stratum-2 { background: var(--protocol-dark); }
.stratum-3 { background: #111D2A; }
.stratum-4 { background: var(--stratum-surface); }

/* Isometric depth shadow */
.stratum::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 40px;
    right: 0;
    height: 40px;
    background: linear-gradient(to bottom right, rgba(0,0,0,0.2), transparent);
    transform: skewX(-30deg);
    pointer-events: none;
    z-index: -1;
}

.stratum-header {
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--schema-line);
    padding-bottom: 1rem;
}

.stratum-label {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--proof-cyan);
}

.stratum-name {
    font-family: var(--font-annotation);
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    color: var(--muted-signal);
    margin-left: 1rem;
}

.stratum-content {
    max-width: 800px;
}

.stratum-content.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1000px;
}

.stratum-content.two-col-60 {
    display: grid;
    grid-template-columns: 60% 40%;
    gap: 2rem;
    max-width: 1000px;
}

.text-block {
    max-width: 62ch;
}

.text-block p {
    margin-bottom: 1rem;
}

.text-block em {
    font-weight: 500;
    font-style: normal;
    color: var(--proof-cyan);
}

.code-inline {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(0.9rem, 1.5vw, 1.1rem);
    color: var(--layer-blue);
    background: rgba(42, 58, 74, 0.3);
    padding: 0.1em 0.3em;
    border-radius: 2px;
}

.validity-text { color: var(--validity-green); font-weight: 500; }
.fraud-text { color: var(--fraud-amber); font-weight: 500; }

/* ---- Exploded Diagram ---- */
.diagram-area {
    display: flex;
    align-items: center;
    justify-content: center;
}

.exploded-diagram {
    width: 100%;
    max-width: 300px;
}

.plate {
    transition: transform 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.plate rect {
    transition: stroke 0.2s ease;
}

.plate:hover rect {
    stroke: var(--layer-blue);
}

.plate:hover text {
    fill: var(--proof-cyan);
}

.exploded-diagram.exploded .plate[data-plate="0"] { transform: translateY(-100px); }
.exploded-diagram.exploded .plate[data-plate="1"] { transform: translateY(-50px); }
.exploded-diagram.exploded .plate[data-plate="2"] { transform: translateY(0); }
.exploded-diagram.exploded .plate[data-plate="3"] { transform: translateY(50px); }
.exploded-diagram.exploded .plate[data-plate="4"] { transform: translateY(100px); }

/* ---- Data Stream ---- */
.data-stream-col {
    display: flex;
    gap: 1rem;
    align-items: stretch;
}

.stream-line {
    width: 8px;
}

.stream-svg {
    width: 4px;
    height: 100%;
}

.proof-canvas {
    border: 1px solid var(--schema-line);
    background: rgba(10, 15, 22, 0.5);
}

/* ---- Application Tiles ---- */
.iso-tile-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 900px;
}

.iso-tile {
    background: var(--protocol-dark);
    border: 1px solid var(--schema-line);
    padding: 1.5rem;
    transform: skewX(-2deg);
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.iso-tile.visible {
    opacity: 1;
}

.iso-tile h3 {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--proof-cyan);
    margin-bottom: 0.5rem;
}

.iso-tile p {
    font-size: 0.9rem;
    color: var(--muted-signal);
}

.iso-tile:hover {
    border-color: var(--layer-blue);
}

/* ---- Footer ---- */
.site-footer {
    padding: 4rem 3rem;
    text-align: center;
}

.annotation {
    font-family: var(--font-annotation);
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    color: var(--muted-signal);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .main-content {
        margin-left: 0;
    }

    .stratum {
        padding: 3rem 1.5rem;
    }

    .stratum-content.two-col,
    .stratum-content.two-col-60 {
        grid-template-columns: 1fr;
    }

    .iso-tile-grid {
        grid-template-columns: 1fr;
    }

    .iso-tile {
        transform: none;
    }

    .stratum-1 {
        transform: none;
    }

    .hero-title {
        font-size: clamp(2rem, 10vw, 4rem);
    }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-snap-type: none;
    }

    .sidebar {
        transform: translateX(0);
        animation: none;
    }

    .hero-title .char {
        opacity: 1;
        transition: none;
    }

    .hero-subtitle {
        opacity: 1;
        transition: none;
    }

    .plate {
        transition: none;
    }

    .iso-tile {
        opacity: 1;
        transition: none;
    }

    .stream-dot {
        display: none;
    }

    .gauge-indicator {
        transition: none;
    }
}