/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --accent:   #6D28D9;  /* Lambda violet — FP/λ-calculus inspired */
    --accent-lt: rgba(109,40,217,0.08);
    --black:    #0A0A0F;
    --gray-2:   #6B7280;
    --border:   #E5E7EB;
    --bg:       #FFFFFF;
    --dot-bg:   rgba(0,0,0,0.038);
    --code-bg:  #0A0A0F;
    --font:     Inter, -apple-system, 'PingFang SC', system-ui, sans-serif;
    --mono:     'JetBrains Mono', SFMono-Regular, Consolas, monospace;
    --nav-h:    56px;
    --frame-w:  1200px;
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--black);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

/* ===== Frame Container ===== */
.fr {
    max-width: var(--frame-w);
    margin: 0 auto;
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
    position: relative;
}

@media (max-width: 1024px) {
    .fr { border-left: none; border-right: none; }
}

/* ===== Row ===== */
.r {
    border-bottom: 1px solid var(--border);
    position: relative;
}
.r:last-child { border-bottom: none; }

/* Dot-grid title row background */
.g-bg {
    background-color: var(--bg);
    background-image:
        linear-gradient(var(--dot-bg) 1px, transparent 1px),
        linear-gradient(90deg, var(--dot-bg) 1px, transparent 1px);
    background-size: 24px 24px;
}

/* ===== Ticks — horizontal inward arrows straddling row top border ===== */
.ticks { position: relative; overflow: visible; }

/* left inward arrow → */
.ticks::before {
    content: '';
    position: absolute;
    top: -7px; left: -1px;
    border-top: 7px solid transparent;
    border-bottom: 7px solid transparent;
    border-left: 7px solid var(--accent);
    z-index: 10;
}
/* right inward arrow ← */
.ticks::after {
    content: '';
    position: absolute;
    top: -7px; right: -1px;
    border-top: 7px solid transparent;
    border-bottom: 7px solid transparent;
    border-right: 7px solid var(--accent);
    z-index: 10;
}
.ticks.only-before::after { display: none; }
.ticks.only-after::before  { display: none; }

/* Closing tick at bottom of .fr — arrows pointing outward */
.ticks-close {
    height: 0;
    position: relative;
    overflow: visible;
}
.ticks-close::before,
.ticks-close::after {
    content: '';
    position: absolute;
    bottom: -7px;
    border-top: 7px solid transparent;
    border-bottom: 7px solid transparent;
    z-index: 10;
}
.ticks-close::before { left: -1px;  border-left:  7px solid var(--accent); }
.ticks-close::after  { right: -1px; border-right: 7px solid var(--accent); }

/* ===== Grid columns (border-based, no gap) ===== */
.cols {
    display: grid;
}
.cols > * {
    padding: 32px;
    border-right: 1px solid var(--border);
}
.cols > *:last-child { border-right: none; }

.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
.cols-6 { grid-template-columns: repeat(6, 1fr); }
.cols-1-2 { grid-template-columns: 1fr 2fr; }
.cols-2-1 { grid-template-columns: 2fr 1fr; }

/* Multi-row grid: remove bottom border from last row */
.cols.multi-row > * { border-bottom: 1px solid var(--border); }
.cols.multi-row.c3 > *:nth-last-child(-n+3) { border-bottom: none; }
.cols.multi-row.c2 > *:nth-last-child(-n+2) { border-bottom: none; }

/* ===== Section title row ===== */
.section-head {
    padding: 48px 32px;
    text-align: center;
}
.eyebrow {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 400;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    display: block;
    margin-bottom: 14px;
}
.section-title {
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--black);
    line-height: 1.2;
    margin-bottom: 10px;
}
.section-desc {
    font-size: 14.5px;
    color: var(--gray-2);
    line-height: 1.65;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: var(--frame-w);
    margin: 0 auto;
    padding: 0 32px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 20px;
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: var(--accent);
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    font-family: var(--mono);
}
.logo-text {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--black);
    letter-spacing: -0.3px;
    font-family: var(--mono);
}

.nav-links {
    display: flex;
    gap: 0;
    flex: 1;
}
.nav-links a {
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 400;
    color: var(--gray-2);
    transition: color 0.15s;
}
.nav-links a:hover { color: var(--black); }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* Buttons */
.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 18px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--border);
    color: var(--black);
    background: none;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
    font-family: var(--font);
    text-decoration: none;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-accent {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 18px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--accent);
    color: var(--accent);
    background: none;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    font-family: var(--font);
    text-decoration: none;
}
.btn-accent:hover { background: var(--accent); color: #fff; }

.btn-erupt {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--gray-2);
    padding: 5px 10px;
    border: 1px solid var(--border);
    transition: color 0.15s, border-color 0.15s;
}
.btn-erupt:hover { color: var(--accent); border-color: var(--accent); }

.btn-github {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: var(--gray-2);
    transition: color 0.15s;
}
.btn-github:hover { color: var(--black); }

.btn-lang {
    font-size: 11px;
    font-weight: 500;
    padding: 5px 10px;
    background: none;
    color: var(--gray-2);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
    font-family: var(--mono);
    letter-spacing: 0.05em;
}
.btn-lang:hover { color: var(--black); border-color: var(--black); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    margin-left: auto;
}
.nav-toggle span {
    width: 20px;
    height: 1.5px;
    background: var(--black);
    transition: transform 0.25s, opacity 0.25s;
}

/* ===== Hero ===== */
.hero {
    padding-top: var(--nav-h);
    border-bottom: 1px solid var(--border);
}

.hero-cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 520px;
}

.hero-copy {
    padding: 64px 48px 64px 32px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--accent);
    border: 1px solid rgba(109,40,217,0.3);
    padding: 4px 10px;
    margin-bottom: 28px;
    text-decoration: none;
    transition: border-color 0.15s;
}
.hero-badge:hover { border-color: var(--accent); }
.badge-dot {
    width: 5px; height: 5px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
}

.hero-title {
    font-size: clamp(38px, 5vw, 58px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.025em;
    color: var(--black);
    margin-bottom: 20px;
}

.hero-sql-word {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.82em;
    font-weight: 700;
    background: var(--accent);
    color: #fff;
    padding: 2px 10px 4px;
    letter-spacing: 0.04em;
    vertical-align: middle;
    position: relative;
    top: -3px;
}

.hero-desc {
    font-size: 14.5px;
    line-height: 1.75;
    color: var(--gray-2);
    margin-bottom: 32px;
    max-width: 400px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 32px;
}

.hero-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.hero-pill {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: 0.08em;
    color: var(--gray-2);
    border: 1px solid var(--border);
    padding: 3px 10px;
    text-transform: uppercase;
}

.hero-visual {
    padding: 32px;
    display: flex;
    align-items: center;
    background-image:
        linear-gradient(var(--dot-bg) 1px, transparent 1px),
        linear-gradient(90deg, var(--dot-bg) 1px, transparent 1px);
    background-size: 24px 24px;
}

/* ===== Code Window ===== */
.code-window {
    background: var(--code-bg);
    overflow: hidden;
    font-family: var(--mono);
    width: 100%;
    border: 1px solid rgba(255,255,255,0.06);
}
.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.02);
}
.code-dots { display: flex; gap: 6px; flex-shrink: 0; }
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }
.code-filename {
    font-size: 11px;
    color: rgba(255,255,255,0.3);
    font-family: var(--mono);
    flex: 1;
}
.code-tag {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.18);
    font-family: var(--mono);
}
.copy-btn {
    font-size: 11px;
    font-weight: 500;
    color: rgba(255,255,255,0.35);
    background: none;
    border: 1px solid rgba(255,255,255,0.1);
    padding: 2px 8px;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
    font-family: var(--mono);
}
.copy-btn:hover { color: rgba(255,255,255,0.7); border-color: rgba(255,255,255,0.25); }
.code-body { padding: 20px; overflow-x: auto; }
.code-body code {
    font-size: 12.5px;
    line-height: 1.75;
    color: #c9d1d9;
    font-family: var(--mono);
}

/* Syntax highlight */
.kw  { color: #60a5fa; }
.cls { color: #fbbf24; }
.fn  { color: #a78bfa; }
.str { color: #86efac; }
.num { color: #f472b6; }
.cmt { color: #6B7280; font-style: italic; }

/* ===== Stats ===== */
.stat-item { text-align: center; }
.stat-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--black);
    letter-spacing: -0.04em;
    line-height: 1.1;
    font-family: var(--mono);
}
.stat-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gray-2);
    margin-top: 6px;
}

/* ===== Scroll reveal ===== */
[data-aos] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-aos].visible { opacity: 1; transform: none; }

/* ===== Feature cards ===== */
.feature-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    color: var(--accent);
    margin-bottom: 16px;
}
.feature-card h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 8px;
}
.feature-card p {
    font-size: 14px;
    color: var(--gray-2);
    line-height: 1.65;
}
.feature-card:hover { background: rgba(109,40,217,0.018); }
.feature-card { transition: background 0.15s; }

/* ===== Syntax flow ===== */
.syntax-flow {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    padding: 20px 32px;
    border-bottom: 1px solid var(--border);
}
.syntax-node {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--black);
    padding: 5px 12px;
    border: 1px solid var(--border);
}
.syntax-node-start { background: var(--accent); color: #fff; border-color: var(--accent); }
.syntax-node-end   { background: var(--black);  color: #fff; border-color: var(--black); }
.syntax-arrow {
    color: var(--border);
    font-size: 14px;
    margin: 0 2px;
    user-select: none;
}

/* Syntax cards grid */
.syntax-card-header {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
}
.syntax-card-tag {
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 2px 8px;
    background: var(--accent);
    color: #fff;
}
.syntax-card-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-2);
}
.syntax-card-items {
    padding: 14px 20px 18px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.syntax-card-items code {
    font-family: var(--mono);
    font-size: 12.5px;
    color: var(--accent);
}

/* ===== Examples tabs ===== */
.examples-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
}
.tab-btn {
    padding: 12px 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-2);
    background: none;
    border: none;
    border-right: 1px solid var(--border);
    cursor: pointer;
    transition: color 0.15s, background 0.15s;
    font-family: var(--font);
    white-space: nowrap;
}
.tab-btn:last-child { border-right: none; }
.tab-btn:hover { color: var(--black); background: rgba(0,0,0,0.02); }
.tab-btn.active {
    color: var(--accent);
    background: rgba(109,40,217,0.04);
    border-bottom: 2px solid var(--accent);
    margin-bottom: -1px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.example-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
}
.example-info {
    padding: 32px;
    border-right: 1px solid var(--border);
}
.example-code { padding: 0; }
.example-info h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 10px;
}
.example-info p {
    font-size: 14px;
    color: var(--gray-2);
    line-height: 1.65;
    margin-bottom: 18px;
}
.example-points {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.example-points li {
    font-size: 13.5px;
    color: var(--gray-2);
    padding-left: 14px;
    position: relative;
    line-height: 1.5;
    font-family: var(--mono);
}
.example-points li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 11px;
}

/* ===== Architecture ===== */
.arch-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 32px;
    gap: 0;
    max-width: 700px;
    margin: 0 auto;
}
.arch-layer {
    width: 100%;
    border: 1px solid var(--border);
    margin-bottom: -1px;
}
.arch-label {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--gray-2);
    padding: 8px 16px;
    border-bottom: 1px solid var(--border);
}
.arch-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 16px;
}
.arch-item {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    padding: 4px 12px;
    border: 1px solid var(--border);
    color: var(--black);
}
.arch-item-core {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.arch-connector {
    color: var(--border);
    padding: 4px 0;
    z-index: 1;
}

/* ===== Scenarios ===== */
.scenario-card { transition: background 0.15s; }
.scenario-card:hover { background: rgba(109,40,217,0.018); }
.scenario-number {
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 10px;
}
/* Ghost number decoration */
.scenario-card {
    position: relative;
    overflow: hidden;
}
.scenario-ghost {
    position: absolute;
    top: -10px;
    right: 12px;
    font-family: var(--mono);
    font-size: 64px;
    font-weight: 700;
    color: var(--black);
    opacity: 0.04;
    line-height: 1;
    pointer-events: none;
    user-select: none;
}
.scenario-card h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 8px;
}
.scenario-card p {
    font-size: 14px;
    color: var(--gray-2);
    line-height: 1.65;
}

/* ===== Steps ===== */
.step-item {
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}
.step-item:last-child { border-bottom: none; }

/* Title row: number + title, full-width border-bottom */
.step-header {
    display: flex;
    align-items: center;
    gap: 0;
    border-bottom: 1px solid var(--border);
}
.step-num-col {
    width: 48px;
    padding: 14px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-right: 1px solid var(--border);
    flex-shrink: 0;
}
.step-number {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.05em;
    line-height: 1;
}
.step-title {
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 600;
    color: var(--black);
}
.step-content {
    padding: 24px 32px 28px 32px;
}

/* Ghost step numbers */
.step-ghost {
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--mono);
    font-size: 80px;
    font-weight: 700;
    color: var(--black);
    opacity: 0.035;
    pointer-events: none;
    user-select: none;
    line-height: 1;
}

/* ===== Comparison ===== */
.compare-label {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
    color: var(--gray-2);
    display: flex;
    align-items: center;
    gap: 8px;
}
.compare-before .compare-label { border-left: 2px solid #ef4444; }
.compare-after .compare-label  { border-left: 2px solid var(--accent); }
.compare-vs {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--gray-2);
    border-right: 1px solid var(--border);
    padding: 32px 16px;
}

/* ===== Roadmap ===== */
.roadmap-items {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 640px;
    margin: 0 auto;
    padding: 32px;
}
.roadmap-item {
    display: grid;
    grid-template-columns: 20px 1fr;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    align-items: start;
}
.roadmap-item:last-child { border-bottom: none; }
.roadmap-dot {
    width: 10px;
    height: 10px;
    border: 2px solid var(--border);
    border-radius: 50%;
    background: var(--bg);
    margin-top: 4px;
    flex-shrink: 0;
}
.roadmap-item.done .roadmap-dot {
    background: var(--accent);
    border-color: var(--accent);
}
.roadmap-status {
    font-family: var(--mono);
    font-size: 9.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    display: block;
    margin-bottom: 4px;
}
.roadmap-item.done .roadmap-status  { color: var(--accent); }
.roadmap-item.planned .roadmap-status { color: var(--gray-2); }
.roadmap-card h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 3px;
}
.roadmap-card p {
    font-size: 13.5px;
    color: var(--gray-2);
    line-height: 1.5;
}

/* ===== Footer ===== */
.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0;
    align-items: start;
    border-bottom: 1px solid var(--border);
}
.footer-brand {
    padding: 32px;
    border-right: 1px solid var(--border);
}
.footer-brand-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}
.footer-desc {
    font-size: 13.5px;
    color: var(--gray-2);
    line-height: 1.65;
}
.footer-links {
    display: flex;
    gap: 0;
}
.footer-col {
    padding: 32px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 140px;
}
.footer-col:last-child { border-right: none; }
.footer-col h4 {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--black);
    margin-bottom: 4px;
}
.footer-col a {
    font-size: 13.5px;
    color: var(--gray-2);
    transition: color 0.15s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
    padding: 16px 32px;
}
.footer-bottom p {
    font-size: 12px;
    color: var(--gray-2);
    font-family: var(--mono);
}

/* ===== Focus ===== */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ===== Responsive ===== */

@media (max-width: 860px) {
    .hero-cols { grid-template-columns: 1fr; }
    .hero-copy { border-right: none; border-bottom: 1px solid var(--border); padding: 48px 24px; }
    .hero-visual { display: none; }
    .cols-3.multi-row { grid-template-columns: repeat(2, 1fr); }
    .cols-3.multi-row > *:nth-last-child(-n+3) { border-bottom: 1px solid var(--border); }
    .cols-3.multi-row > *:nth-last-child(-n+2) { border-bottom: none; }
    .example-grid { grid-template-columns: 1fr; }
    .example-info { border-right: none; border-bottom: 1px solid var(--border); }
    .compare-vs { display: none; }
    .cols-2 { grid-template-columns: 1fr; }
    .cols-1-2 { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
    .cols-4 { grid-template-columns: repeat(2, 1fr); }
    .cols-4 > *:nth-child(2n) { border-right: none; }
    .cols-4 > *:nth-last-child(-n+2) { border-bottom: none; }
    .cols-3.multi-row { grid-template-columns: 1fr; }
    .cols-3.multi-row > * { border-right: none; border-bottom: 1px solid var(--border); }
    .cols-3.multi-row > *:last-child { border-bottom: none; }
    .nav-links { display: none; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: var(--nav-h);
        left: 0; right: 0;
        background: var(--bg);
        padding: 12px;
        border-bottom: 1px solid var(--border);
        z-index: 999;
    }
    .nav-toggle { display: flex; }
    .section-head { padding: 32px 20px; }
    .cols > * { padding: 24px; }
    .footer-inner { grid-template-columns: 1fr; }
    .footer-brand { border-right: none; border-bottom: 1px solid var(--border); }
    .footer-links { flex-direction: column; }
    .footer-col { border-right: none; border-bottom: 1px solid var(--border); min-width: auto; }
    .footer-col:last-child { border-bottom: none; }
    .examples-tabs { flex-wrap: wrap; }
    .tab-btn { border-bottom: 1px solid var(--border); }
    .syntax-flow { padding: 16px 20px; }
}

@media (max-width: 480px) {
    .hero-actions { flex-direction: column; align-items: stretch; }
    .hero-actions .btn-outline,
    .hero-actions .btn-accent { justify-content: center; }
    .cols-4 > * { border-right: none !important; }
}