:root {
    --bg: #070b11;
    --bg-elevated: rgba(15, 21, 32, 0.9);
    --bg-panel: rgba(20, 27, 38, 0.92);
    --bg-soft: rgba(255, 255, 255, 0.03);
    --text: #edf3ff;
    --text-dim: #90a0b8;
    --line: rgba(144, 160, 184, 0.18);
    --line-strong: rgba(0, 232, 255, 0.34);
    --accent-rust: #f74c00;
    --accent-cyan: #00e8ff;
    --accent-purple: #b877db;
    --accent-green: #bae67e;
    --shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 14px 40px rgba(0, 0, 0, 0.28);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --site-width: 1240px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Inter", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(247, 76, 0, 0.14), transparent 28%),
        radial-gradient(circle at 82% 18%, rgba(0, 232, 255, 0.12), transparent 24%),
        radial-gradient(circle at 50% 120%, rgba(184, 119, 219, 0.16), transparent 38%),
        linear-gradient(180deg, #06090f 0%, #090d14 48%, #06080d 100%);
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 36px 36px;
    mask-image: radial-gradient(circle at center, black 45%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
textarea,
select {
    font: inherit;
}

code,
pre {
    font-family: "JetBrains Mono", monospace;
}

.site-shell {
    position: relative;
    width: min(calc(100% - 32px), var(--site-width));
    margin: 0 auto;
    padding: 24px 0 64px;
    z-index: 1;
}

.ambient {
    position: fixed;
    border-radius: 999px;
    filter: blur(80px);
    opacity: 0.35;
    pointer-events: none;
    z-index: 0;
}

.ambient-one {
    top: 120px;
    right: 8%;
    width: 260px;
    height: 260px;
    background: rgba(0, 232, 255, 0.2);
}

.ambient-two {
    bottom: 80px;
    left: 4%;
    width: 300px;
    height: 300px;
    background: rgba(184, 119, 219, 0.18);
}

.topbar {
    position: sticky;
    top: 16px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 18px;
    padding: 16px 20px;
    margin-bottom: 32px;
    background: rgba(8, 12, 18, 0.72);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.brand-mark {
    position: relative;
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 28px rgba(0, 232, 255, 0.26);
    overflow: hidden;
}

.brand-logo {
    display: block;
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.brand-mark-fallback {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: transparent;
    font-family: "Orbitron", sans-serif;
    font-weight: 900;
    letter-spacing: 0.06em;
}

.brand-mark.is-fallback {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-color: transparent;
}

.brand-mark.is-fallback .brand-mark-fallback {
    color: #081018;
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-copy strong {
    font-size: 0.98rem;
}

.brand-copy small {
    color: var(--text-dim);
}

.primary-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.primary-nav a {
    padding: 10px 14px;
    color: var(--text-dim);
    border-radius: 999px;
    transition: 180ms ease;
}

.primary-nav a:hover,
.primary-nav a.is-active {
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
}

.topbar-actions,
.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.nav-toggle {
    display: none;
    justify-self: end;
    padding: 10px 14px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 600;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button-primary {
    color: #081018;
    background: linear-gradient(135deg, var(--accent-cyan), #76efff);
    box-shadow: 0 10px 24px rgba(0, 232, 255, 0.24);
}

.button-ghost {
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
}

.section {
    position: relative;
    padding: 44px 0;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
    gap: 22px;
    align-items: start;
    padding-top: 24px;
}

.hero-copy,
.hero-panel,
.feature-panel,
.diagram-frame,
.insight-card,
.system-card,
.crate-card,
.workflow-step,
.command-card {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(14px);
}

.hero-copy {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    padding: 28px;
    min-height: 100%;
    min-width: 0;
}

.eyebrow,
.panel-label,
.panel-kicker,
.system-tag,
.frame-topline,
.insight-index {
    font-family: "JetBrains Mono", monospace;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.eyebrow,
.panel-label {
    color: var(--accent-cyan);
}

.hero h1,
.section-heading h2 {
    margin: 10px 0 0;
    font-family: "Orbitron", sans-serif;
    line-height: 1.04;
}

.hero h1 {
    max-width: 12ch;
    font-size: clamp(2.65rem, 4.7vw, 5rem);
    letter-spacing: -0.03em;
    text-wrap: balance;
    word-break: normal;
    overflow-wrap: normal;
    hyphens: none;
}

.hero-text,
.feature-panel p,
.section-copy,
.system-card p,
.crate-card li,
.workflow-step p,
.command-card p,
.insight-card p {
    color: var(--text-dim);
    line-height: 1.75;
}

.hero-text {
    max-width: 64ch;
    margin: 18px 0 28px;
    font-size: 1.05rem;
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-top: 28px;
}

.metric-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 18px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.metric-value {
    font-family: "Orbitron", sans-serif;
    font-size: 1.8rem;
    color: var(--accent-green);
}

.metric-label {
    color: var(--text-dim);
    font-size: 0.94rem;
}

.hero-panel {
    position: relative;
    padding: 24px;
    overflow: hidden;
}

.hero-panel::before,
.feature-panel::before,
.diagram-frame::before,
.system-card::before,
.crate-card::before,
.workflow-step::before,
.command-card::before,
.insight-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 3px;
    border-radius: inherit;
    background: linear-gradient(90deg, transparent, var(--accent-cyan), var(--accent-purple), transparent);
}

.panel-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.panel-heading strong {
    font-family: "Orbitron", sans-serif;
    font-size: 1.2rem;
}

.panel-kicker {
    color: var(--accent-purple);
}

.stack {
    display: grid;
    gap: 14px;
}

.stack-layer {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 18px;
    padding: 18px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.stack-layer h2 {
    margin: 0 0 6px;
    font-size: 1rem;
}

.stack-layer p {
    margin: 0;
    color: var(--text-dim);
    line-height: 1.7;
}

.stack-layer span {
    white-space: nowrap;
    font-size: 0.78rem;
    padding: 7px 10px;
    border-radius: 999px;
    font-family: "JetBrains Mono", monospace;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.layer-purple span {
    color: var(--accent-purple);
    background: rgba(184, 119, 219, 0.12);
}

.layer-cyan span {
    color: var(--accent-cyan);
    background: rgba(0, 232, 255, 0.1);
}

.layer-green span {
    color: var(--accent-green);
    background: rgba(186, 230, 126, 0.12);
}

.layer-rust span {
    color: var(--accent-rust);
    background: rgba(247, 76, 0, 0.12);
}

.overview-grid,
.systems-grid,
.crate-grid,
.command-grid {
    display: grid;
    gap: 18px;
}

.overview-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-panel {
    position: relative;
    padding: 24px;
}

.feature-panel h2,
.system-card h3,
.crate-card h3,
.workflow-step h3,
.command-card h3,
.insight-card h3 {
    margin: 12px 0 10px;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 22px;
}

.section-heading h2 {
    font-size: clamp(2rem, 5vw, 3.2rem);
}

.section-copy {
    max-width: 54ch;
}

.text-link {
    color: var(--accent-cyan);
    font-weight: 600;
}

.architecture-layout {
    display: grid;
    grid-template-columns: 1fr;
}

.diagram-frame {
    position: relative;
    padding: 18px;
}

.frame-topline {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 14px;
    color: var(--text-dim);
}

.diagram-embed {
    width: 100%;
    min-height: 720px;
    background: #05080d;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
}

.architecture-notes {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.insight-card {
    position: relative;
    padding: 24px;
}

.insight-index {
    color: var(--accent-rust);
}

.systems-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.system-card {
    position: relative;
    padding: 24px;
}

.system-tag {
    display: inline-block;
    padding: 6px 10px;
    border-radius: 999px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
}

.accent-purple {
    border-color: rgba(184, 119, 219, 0.22);
}

.accent-cyan {
    border-color: rgba(0, 232, 255, 0.22);
}

.accent-green {
    border-color: rgba(186, 230, 126, 0.22);
}

.accent-rust {
    border-color: rgba(247, 76, 0, 0.22);
}

.crate-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.crate-card {
    position: relative;
    padding: 24px;
}

.crate-card ul {
    margin: 14px 0 0;
    padding-left: 18px;
    display: grid;
    gap: 10px;
}

.crate-card code,
.command-card code {
    color: var(--accent-green);
}

.workflow-timeline {
    display: grid;
    gap: 16px;
}

.workflow-step {
    position: relative;
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 18px;
    padding: 22px 24px;
}

.workflow-step span {
    display: grid;
    place-items: center;
    width: 56px;
    height: 56px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(0, 232, 255, 0.16), rgba(184, 119, 219, 0.16));
    color: var(--accent-cyan);
    font-family: "Orbitron", sans-serif;
}

.command-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.command-card {
    position: relative;
    padding: 22px;
}

.command-header {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 14px;
}

.copy-button {
    padding: 8px 12px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    cursor: pointer;
    transition: 180ms ease;
}

.copy-button:hover,
.copy-button.is-copied {
    border-color: rgba(0, 232, 255, 0.4);
    background: rgba(0, 232, 255, 0.12);
}

.command-card pre {
    margin: 16px 0 12px;
    padding: 18px;
    overflow-x: auto;
    background: rgba(7, 11, 17, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
}

.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-top: 22px;
    padding: 28px 0 10px;
    color: var(--text-dim);
}

.site-footer strong,
.site-footer a {
    color: var(--text);
}

.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 560ms cubic-bezier(0.16, 1, 0.3, 1), transform 560ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (max-width: 1120px) {
    .hero,
    .architecture-layout,
    .systems-grid,
    .crate-grid {
        grid-template-columns: 1fr 1fr;
    }

    .architecture-notes {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .overview-grid,
    .command-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 860px) {
    .site-shell {
        width: min(calc(100% - 20px), var(--site-width));
        padding-top: 16px;
    }

    .topbar {
        grid-template-columns: auto auto;
        border-radius: 28px;
    }

    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .primary-nav,
    .topbar-actions {
        display: none;
        grid-column: 1 / -1;
        width: 100%;
        justify-content: flex-start;
    }

    .topbar.is-open .primary-nav,
    .topbar.is-open .topbar-actions {
        display: flex;
        padding-top: 8px;
    }

    .hero,
    .architecture-layout,
    .systems-grid,
    .crate-grid,
    .command-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        max-width: none;
        overflow-wrap: normal;
    }

    .hero-metrics {
        grid-template-columns: 1fr;
    }

    .architecture-notes {
        grid-template-columns: 1fr;
    }

    .section-heading,
    .site-footer,
    .panel-heading {
        flex-direction: column;
        align-items: start;
    }

    .workflow-step {
        grid-template-columns: 1fr;
    }

    .workflow-step span {
        width: 48px;
        height: 48px;
    }
}

@media (max-width: 560px) {
    .hero-copy,
    .hero-panel,
    .feature-panel,
    .diagram-frame,
    .insight-card,
    .system-card,
    .crate-card,
    .workflow-step,
    .command-card {
        padding: 20px;
    }

    .topbar {
        padding: 14px 16px;
    }

    .button,
    .copy-button,
    .nav-toggle {
        width: 100%;
        justify-content: center;
    }

    .hero-actions,
    .topbar-actions {
        width: 100%;
    }

    .diagram-embed {
        min-height: 520px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: #070b11;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 999px;
}

/* ─── Page layout: main content + sticky right sidebar ─────────────────────── */

.page-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 216px;
    gap: 40px;
    align-items: start;
}

.page-sidebar {
    position: sticky;
    top: 96px;
    padding-top: 21px;
}

.sidebar-nav {
    position: relative;
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(14px);
    padding: 22px 18px 20px;
    overflow: hidden;
}

.sidebar-nav::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 3px;
    border-radius: inherit;
    background: linear-gradient(90deg, transparent, var(--accent-cyan), var(--accent-purple), transparent);
}

.sidebar-nav-label {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin: 0 0 14px;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sidebar-nav li a {
    display: block;
    padding: 8px 10px;
    color: var(--text-dim);
    border-radius: 8px;
    font-size: 0.88rem;
    line-height: 1.4;
    transition: color 180ms ease, background 180ms ease;
}

.sidebar-nav li a:hover,
.sidebar-nav li a.is-active {
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
}

/* Slim topbar: no center nav column */
.topbar--slim {
    grid-template-columns: auto auto;
    justify-content: space-between;
}

/* Guide body tables: scroll horizontally on narrow viewports */
.guide-body table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 1120px) {
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 196px;
        gap: 28px;
    }
}

@media (max-width: 860px) {
    .page-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .page-sidebar {
        position: static;
        display: none;
    }

    .page-sidebar.is-open {
        display: block;
        margin-bottom: 24px;
    }

    .topbar--slim {
        grid-template-columns: auto auto;
    }
}