:root {
    --bg: #06060b;
    --bg-subtle: #0b0b14;
    --bg-card: #0f0f1e;
    --bg-code: #0a0a16;
    --border: #1a1a33;
    --border-dim: #12122a;
    --text: #e8eaf0;
    --text-dim: #7c829a;
    --text-bright: #ffffff;
    --cyan: #22d3ee;
    --cyan-dim: #1899a8;
    --cyan-glow: rgba(34, 211, 238, 0.15);
    --purple: #a78bfa;
    --purple-dim: #7c5cbf;
    --purple-glow: rgba(167, 139, 250, 0.12);
    --green: #34d399;
    --green-glow: rgba(52, 211, 153, 0.12);
    --amber: #fbbf24;
    --red: #f87171;
    --mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
    --sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
    --sidebar-w: 260px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ── LAYOUT ── */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    height: 56px;
    display: flex; align-items: center;
    padding: 0 24px;
    background: rgba(6, 6, 11, 0.85);
    backdrop-filter: blur(24px) saturate(1.2);
    border-bottom: 1px solid var(--border-dim);
}

.site-header .logo {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none; color: var(--text-bright);
    font-weight: 700; font-size: 16px; letter-spacing: -0.02em;
}

.site-header .logo svg { width: 24px; height: 24px; }

.site-header .logo span.dim {
    color: var(--text-dim); font-weight: 400; margin-left: 2px;
}

.site-header nav {
    margin-left: auto;
    display: flex; gap: 4px;
}

.site-header nav a {
    color: var(--text-dim); text-decoration: none;
    padding: 6px 12px; border-radius: 6px;
    font-size: 13px; font-weight: 500;
    transition: color 0.2s, background 0.2s;
}

.site-header nav a:hover,
.site-header nav a.active {
    color: var(--cyan); background: var(--cyan-glow);
}

.sidebar {
    position: fixed; top: 56px; left: 0; bottom: 0;
    width: var(--sidebar-w);
    padding: 24px 16px;
    border-right: 1px solid var(--border-dim);
    overflow-y: auto;
    background: var(--bg);
    z-index: 50;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.sidebar .section-title {
    font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--text-dim); margin: 20px 0 8px;
    padding: 0 8px;
}

.sidebar .section-title:first-child { margin-top: 0; }

.sidebar a {
    display: block; padding: 5px 8px;
    color: var(--text-dim); text-decoration: none;
    font-size: 13px; border-radius: 5px;
    transition: color 0.15s, background 0.15s;
    line-height: 1.5;
}

.sidebar a:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.sidebar a.active { color: var(--cyan); background: var(--cyan-glow); font-weight: 500; }

.sidebar a.nested { padding-left: 20px; font-size: 12.5px; }

.main {
    margin-left: var(--sidebar-w);
    margin-top: 56px;
    min-height: calc(100vh - 56px);
    padding: 48px 56px 96px;
    max-width: 880px;
}

/* ── TYPOGRAPHY ── */
h1 {
    font-size: 36px; font-weight: 800;
    letter-spacing: -0.035em;
    color: var(--text-bright);
    margin-bottom: 12px;
    line-height: 1.15;
}

h1 .pkg-badge {
    display: inline-block;
    font-size: 12px; font-weight: 600;
    padding: 3px 10px; border-radius: 20px;
    vertical-align: middle; margin-left: 10px;
    letter-spacing: 0;
}

h1 .pkg-badge.core { background: var(--cyan-glow); color: var(--cyan); }
h1 .pkg-badge.worker { background: var(--purple-glow); color: var(--purple); }
h1 .pkg-badge.net { background: var(--green-glow); color: var(--green); }
h1 .pkg-badge.rep { background: rgba(251, 191, 36, 0.12); color: var(--amber); }

.subtitle {
    font-size: 18px; color: var(--text-dim);
    margin-bottom: 40px; line-height: 1.65;
    max-width: 640px;
}

h2 {
    font-size: 24px; font-weight: 700;
    color: var(--text-bright);
    margin: 56px 0 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-dim);
    letter-spacing: -0.02em;
}

h2:first-of-type { margin-top: 0; }

h3 {
    font-size: 17px; font-weight: 600;
    color: var(--text-bright);
    margin: 32px 0 12px;
}

h4 {
    font-size: 14px; font-weight: 600;
    color: var(--purple);
    margin: 24px 0 8px;
    font-family: var(--mono);
}

p { margin-bottom: 16px; }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { margin: 0 0 16px 24px; }
li { margin-bottom: 6px; }
li code { font-size: 0.9em; }

strong { color: var(--text-bright); font-weight: 600; }

/* ── CODE ── */
code {
    font-family: var(--mono);
    font-size: 13px;
    background: var(--bg-code);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-dim);
    color: var(--cyan);
}

pre {
    position: relative;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 0 0 24px;
    line-height: 1.55;
}

pre code {
    background: none; border: none; padding: 0;
    color: var(--text); font-size: 13px;
}

.code-label {
    display: inline-block;
    font-family: var(--mono);
    font-size: 11px; font-weight: 600;
    color: var(--text-dim);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-bottom: none;
    padding: 4px 12px;
    border-radius: 6px 6px 0 0;
    margin-bottom: -1px;
    position: relative; z-index: 1;
}

pre .copy-btn {
    position: absolute; top: 10px; right: 10px;
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-dim); padding: 4px 10px;
    border-radius: 5px; font-size: 11px; font-family: var(--sans);
    cursor: pointer; opacity: 0; transition: opacity 0.2s;
}
pre:hover .copy-btn { opacity: 1; }
pre .copy-btn:hover { color: var(--cyan); border-color: var(--cyan); }
pre .copy-btn.copied { color: var(--green); border-color: var(--green); }

/* syntax colors in <pre> */
.kw { color: #c678dd; }
.ty { color: #e5c07b; }
.str { color: #98c379; }
.cm { color: #5c6370; font-style: italic; }
.fn { color: #61afef; }
.num { color: #d19a66; }
.at { color: #56b6c2; }

/* ── TABLES ── */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 24px;
    font-size: 14px;
}

th {
    text-align: left;
    padding: 10px 14px;
    font-weight: 600; font-size: 12px;
    text-transform: uppercase; letter-spacing: 0.06em;
    color: var(--text-dim);
    border-bottom: 2px solid var(--border);
    background: var(--bg-subtle);
}

td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-dim);
    vertical-align: top;
}

td code { font-size: 12.5px; white-space: nowrap; }

tr:hover td { background: rgba(255,255,255,0.015); }

/* ── CALLOUTS ── */
.callout {
    border-radius: 10px;
    padding: 18px 22px;
    margin: 0 0 24px;
    font-size: 14px;
    border-left: 3px solid;
}

.callout.info { background: var(--cyan-glow); border-color: var(--cyan); }
.callout.warn { background: rgba(251, 191, 36, 0.08); border-color: var(--amber); }
.callout.tip { background: var(--green-glow); border-color: var(--green); }

.callout .callout-title {
    font-weight: 700; font-size: 12px;
    text-transform: uppercase; letter-spacing: 0.06em;
    margin-bottom: 6px;
}

.callout.info .callout-title { color: var(--cyan); }
.callout.warn .callout-title { color: var(--amber); }
.callout.tip .callout-title { color: var(--green); }

/* ── DIAGRAM BOXES ── */
.diagram {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    margin: 0 0 24px;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.6;
    white-space: pre;
    overflow-x: auto;
    color: var(--text-dim);
}

/* ── PARAM LIST ── */
.param-list { margin: 0 0 24px; }

.param-list .param {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-dim);
    display: flex; gap: 12px; align-items: baseline;
}

.param-list .param:last-child { border-bottom: none; }
.param-name { font-family: var(--mono); font-size: 13px; color: var(--cyan); flex-shrink: 0; min-width: 140px; }
.param-type { font-family: var(--mono); font-size: 12px; color: var(--purple); flex-shrink: 0; }
.param-desc { font-size: 14px; color: var(--text-dim); }

/* ── BADGES ── */
.badge {
    display: inline-block;
    font-family: var(--mono);
    font-size: 11px; font-weight: 600;
    padding: 2px 8px; border-radius: 4px;
    vertical-align: middle;
}

.badge.async { background: var(--cyan-glow); color: var(--cyan); }
.badge.sync { background: var(--green-glow); color: var(--green); }
.badge.protocol { background: var(--purple-glow); color: var(--purple); }
.badge.actor { background: rgba(251, 191, 36, 0.1); color: var(--amber); }

/* ── CHAIN VISUALIZATION ── */
.chain-visual {
    display: flex; align-items: center; gap: 0;
    margin: 24px 0 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.chain-node {
    padding: 14px 24px;
    border-radius: 10px;
    border: 1px solid;
    text-align: center;
    font-size: 13px; font-weight: 600;
    min-width: 140px;
}

.chain-node.memory { border-color: var(--green); color: var(--green); background: var(--green-glow); }
.chain-node.disk { border-color: var(--purple); color: var(--purple); background: var(--purple-glow); }
.chain-node.network { border-color: var(--cyan); color: var(--cyan); background: var(--cyan-glow); }
.chain-node.tally { border-color: var(--amber); color: var(--amber); background: rgba(251,191,36,0.08); }

.chain-arrow {
    font-family: var(--mono);
    color: var(--text-dim);
    padding: 0 8px;
    font-size: 18px;
}

.chain-label {
    display: block; font-size: 11px;
    font-weight: 400; margin-top: 3px;
    opacity: 0.7;
}

/* ══════════════════════════════════════════
   LANDING PAGE — index.html specific
   ══════════════════════════════════════════ */

/* Hero */
.landing-hero {
    padding: 16px 0 48px;
    border-bottom: 1px solid var(--border-dim);
    margin-bottom: 56px;
}

.landing-hero h1 {
    font-size: 44px;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 18px;
    background: linear-gradient(135deg, var(--text-bright) 0%, var(--cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.landing-hero .tagline {
    font-size: 20px;
    color: var(--text-dim);
    line-height: 1.6;
    max-width: 580px;
    margin-bottom: 28px;
}

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

.landing-hero .btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 22px; border-radius: 8px;
    font-size: 14px; font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--cyan); color: var(--bg);
}
.btn-primary:hover { background: #3de0f5; text-decoration: none; }

.btn-secondary {
    background: transparent; color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--text-dim); text-decoration: none; }

/* Stats strip */
.stats-strip {
    display: flex; gap: 36px;
    padding: 24px 0;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.stat {
    display: flex; flex-direction: column;
}

.stat-value {
    font-size: 28px; font-weight: 800;
    color: var(--text-bright);
    letter-spacing: -0.03em;
    line-height: 1;
}

.stat-value .accent { color: var(--cyan); }

.stat-label {
    font-size: 13px; color: var(--text-dim);
    margin-top: 4px;
}

/* Architecture SVG */
.arch-diagram {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px 24px;
    margin: 24px 0 32px;
    overflow-x: auto;
}

.arch-diagram svg { display: block; margin: 0 auto; }

/* Package cards */
.pkg-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 24px 0 32px;
}

.pkg-card {
    background: var(--bg-card);
    border: 1px solid var(--border-dim);
    border-radius: 12px;
    padding: 22px 24px;
    text-decoration: none;
    transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
    display: flex; flex-direction: column;
}

.pkg-card:hover {
    border-color: var(--border);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    text-decoration: none;
}

.pkg-card .pkg-card-header {
    display: flex; align-items: center; gap: 10px;
    margin-bottom: 8px;
}

.pkg-card .pkg-card-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.pkg-card .pkg-card-name {
    font-size: 16px; font-weight: 700;
    color: var(--text-bright);
    letter-spacing: -0.01em;
}

.pkg-card .pkg-card-desc {
    font-size: 13.5px;
    color: var(--text-dim);
    line-height: 1.55;
    flex-grow: 1;
}

.pkg-card .pkg-card-types {
    margin-top: 12px;
    display: flex; flex-wrap: wrap; gap: 6px;
}

.pkg-card .pkg-card-types code {
    font-size: 11px;
    padding: 1px 6px;
    background: rgba(255,255,255,0.03);
    border-color: var(--border);
    color: var(--text-dim);
}

.pkg-card.full-width { grid-column: 1 / -1; }

/* Inline quick start */
.quick-inline {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    margin: 24px 0 32px;
}

.quick-inline .quick-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 16px;
}

.quick-inline .quick-header h3 {
    margin: 0; font-size: 15px;
}

.quick-inline .quick-header a {
    font-size: 13px; color: var(--cyan);
}

.quick-inline pre {
    margin: 0;
    border-color: var(--border-dim);
    background: var(--bg-code);
}

/* Principle cards */
.principles {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 24px 0 32px;
}

.principle {
    padding: 20px 22px;
    border-radius: 10px;
    border: 1px solid var(--border-dim);
    background: var(--bg-card);
}

.principle h3 {
    font-size: 15px; margin: 0 0 8px;
    display: flex; align-items: center; gap: 8px;
}

.principle .p-icon {
    width: 20px; height: 20px; border-radius: 5px;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; flex-shrink: 0;
}

.principle p {
    font-size: 13.5px; color: var(--text-dim);
    margin: 0; line-height: 1.55;
}

/* ══════════════════════════════════════════
   ROADMAP PAGE — roadmap.html specific
   ══════════════════════════════════════════ */

/* Vision banner */
.vision-banner {
    background: linear-gradient(135deg, rgba(34,211,238,0.06) 0%, rgba(167,139,250,0.06) 100%);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px;
    margin: 0 0 48px;
}

.vision-banner p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text);
    margin: 0;
    max-width: 680px;
}

.vision-banner p strong { color: var(--cyan); font-weight: 700; }

/* Differentiator grid */
.diff-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 24px 0 40px;
}

.diff-card {
    background: var(--bg-card);
    border: 1px solid var(--border-dim);
    border-radius: 12px;
    padding: 22px 24px;
}

.diff-card h3 {
    font-size: 15px;
    margin: 0 0 8px;
    display: flex; align-items: center; gap: 10px;
}

.diff-card h3 .d-icon {
    width: 28px; height: 28px; border-radius: 7px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px; flex-shrink: 0;
}

.diff-card p {
    font-size: 13.5px;
    color: var(--text-dim);
    margin: 0;
    line-height: 1.55;
}

.diff-card .compare {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-dim);
    font-family: var(--mono);
    opacity: 0.7;
}

/* Phase timeline */
.phase-timeline {
    position: relative;
    padding-left: 32px;
    margin: 32px 0 48px;
}

.phase-timeline::before {
    content: '';
    position: absolute;
    left: 7px; top: 8px; bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--cyan) 0%, var(--purple) 50%, var(--green) 100%);
    opacity: 0.3;
    border-radius: 2px;
}

.phase {
    position: relative;
    margin-bottom: 40px;
}

.phase:last-child { margin-bottom: 0; }

.phase::before {
    content: '';
    position: absolute;
    left: -28px; top: 6px;
    width: 14px; height: 14px;
    border-radius: 50%;
    border: 2px solid;
    background: var(--bg);
}

.phase.current::before {
    border-color: var(--cyan);
    background: var(--cyan);
    box-shadow: 0 0 12px rgba(34,211,238,0.4);
}

.phase.next::before { border-color: var(--purple); }
.phase.future::before { border-color: var(--text-dim); opacity: 0.5; }

.phase-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.phase-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-bright);
    letter-spacing: -0.02em;
}

.phase-tag {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.02em;
}

.phase-tag.active {
    background: var(--cyan-glow);
    color: var(--cyan);
}

.phase-tag.planned {
    background: var(--purple-glow);
    color: var(--purple);
}

.phase-tag.future-tag {
    background: rgba(255,255,255,0.04);
    color: var(--text-dim);
}

.phase-desc {
    font-size: 15px;
    color: var(--text-dim);
    margin-bottom: 14px;
    line-height: 1.6;
}

.phase-items {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.phase-item {
    background: var(--bg-card);
    border: 1px solid var(--border-dim);
    border-radius: 8px;
    padding: 14px 16px;
    font-size: 13.5px;
    color: var(--text);
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.phase-item .item-status {
    flex-shrink: 0;
    width: 18px; height: 18px;
    border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    font-size: 10px;
    margin-top: 1px;
}

.phase-item .item-status.done {
    background: var(--green-glow); color: var(--green);
}

.phase-item .item-status.wip {
    background: var(--cyan-glow); color: var(--cyan);
}

.phase-item .item-status.planned {
    background: rgba(255,255,255,0.04); color: var(--text-dim);
}

.phase-item .item-text {
    display: flex;
    flex-direction: column;
}

.phase-item .item-title {
    font-weight: 600;
    color: var(--text-bright);
    font-size: 13.5px;
}

.phase-item .item-desc {
    font-size: 12.5px;
    color: var(--text-dim);
    margin-top: 2px;
    line-height: 1.45;
}

/* Comparison table enhancements */
.vs-table td:first-child {
    font-weight: 600;
    color: var(--text-bright);
}

.vs-table .lattice-col {
    background: rgba(34,211,238,0.04);
}

.vs-table .check { color: var(--green); }
.vs-table .cross { color: var(--red); opacity: 0.6; }
.vs-table .partial { color: var(--amber); }

/* ── TUTORIALS ── */
.tutorial-breadcrumb {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-bottom: 0.25rem;
}

.tutorial-breadcrumb a {
    color: var(--cyan);
    text-decoration: none;
}

.tutorial-breadcrumb a:hover {
    text-decoration: underline;
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0;
}

.tutorial-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.2s, transform 0.2s;
}

.tutorial-card:hover {
    border-color: var(--cyan);
    transform: translateY(-2px);
}

.tutorial-num {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--cyan);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.tutorial-card h3 {
    font-size: 1.1rem;
    color: var(--text-bright);
}

.tutorial-card p {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.5;
}

.tutorial-meta {
    font-size: 0.75rem;
    color: var(--purple);
    margin-top: auto;
}

.tutorial-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-dim);
}

.tutorial-nav a {
    color: var(--cyan);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.tutorial-nav a:hover {
    text-decoration: underline;
}

.step-flow {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.step-box {
    flex: 1;
    min-width: 160px;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: center;
}

.step-box .step-num {
    display: inline-block;
    width: 24px;
    height: 24px;
    line-height: 24px;
    border-radius: 50%;
    background: var(--cyan);
    color: var(--bg);
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.step-box p {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 0.25rem;
}

.step-arrow {
    color: var(--cyan);
    font-size: 1.25rem;
    font-weight: 700;
}

pre.diagram {
    background: var(--bg-code);
    border: 1px solid var(--border-dim);
    border-radius: 8px;
    padding: 1.25rem;
    overflow-x: auto;
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--text-dim);
}

/* ── FOOTER ── */
.site-footer {
    margin-left: var(--sidebar-w);
    padding: 32px 56px;
    border-top: 1px solid var(--border-dim);
    color: var(--text-dim);
    font-size: 13px;
    display: flex; justify-content: space-between; align-items: center;
}

.site-footer a { color: var(--text-dim); }
.site-footer a:hover { color: var(--cyan); }

/* ── MOBILE ── */
.mobile-menu-btn {
    display: none;
    background: none; border: none;
    color: var(--text-dim); cursor: pointer;
    padding: 8px;
}

@media (max-width: 860px) {
    .sidebar { display: none; }
    .sidebar.open { display: block; width: 100%; z-index: 90; }
    .main { margin-left: 0; padding: 32px 20px 64px; }
    .site-footer { margin-left: 0; padding: 24px 20px; flex-direction: column; gap: 8px; }
    .mobile-menu-btn { display: block; }
    h1 { font-size: 26px; }
    .landing-hero h1 { font-size: 32px; }
    h2 { font-size: 20px; }
    pre { padding: 14px; }
    .chain-visual { flex-direction: column; }
    .chain-arrow { transform: rotate(90deg); }
    .pkg-grid { grid-template-columns: 1fr; }
    .principles { grid-template-columns: 1fr; }
    .stats-strip { gap: 24px; }
    .diff-grid { grid-template-columns: 1fr; }
    .phase-items { grid-template-columns: 1fr; }
    .phase-name { font-size: 17px; }
}