:root {
    --bg-gradient: linear-gradient(to bottom right, #ffffff, #f0f9ff, #f6fff8);
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    --accent-gradient: linear-gradient(to right, #ff7f50, #0ea5e9, #84cc16);
    --accent-coral: #ff7f50;
    --accent-azure: #0ea5e9;
    --accent-sage: #84cc16;
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --glass-shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Cascadia Code", "Fira Code", "JetBrains Mono", Menlo, monospace;
    --max-width: 720px;
    --border-radius: 12px;
}

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

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ── Header ───────────────────────────────────── */
.site-header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.6);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-nav { display: flex; align-items: center; }

.nav-cta {
    display: inline-block;
    padding: 0.4rem 1.1rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.8125rem;
    text-decoration: none;
    background: var(--text-primary);
    color: white;
    transition: opacity 0.2s;
}

.nav-cta:hover { opacity: 0.8; }

/* ── Hero ─────────────────────────────────────── */
.hero {
    padding: 7rem 0 5rem;
}

.hero-kicker {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin-bottom: 1.25rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 5.5vw, 3.75rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-sub {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 540px;
    line-height: 1.7;
    margin-bottom: 2.5rem;
}

/* ── Install Block ────────────────────────────── */
.install-block {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.install-tabs {
    display: flex;
    gap: 0.25rem;
}

.install-tab {
    padding: 0.35rem 0.85rem;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    background: transparent;
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.install-tab:hover {
    color: var(--text-secondary);
}

.install-tab.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: white;
}

.terminal-box {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    box-shadow: var(--glass-shadow);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    width: fit-content;
}

.terminal-box:hover {
    border-color: rgba(14, 165, 233, 0.3);
    box-shadow: var(--glass-shadow-lg);
}

.terminal-box .prompt {
    color: var(--accent-coral);
    user-select: none;
}

.terminal-box code { white-space: nowrap; }

.terminal-box .copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-tertiary);
    padding: 0.125rem;
    border-radius: 4px;
    transition: color 0.2s;
    display: flex;
    align-items: center;
}

.terminal-box .copy-btn:hover { color: var(--text-primary); }

.install-hint {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.install-hint code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    background: rgba(0,0,0,0.04);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

/* ── Platform Note ────────────────────────────── */
.platform-note {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.platform-note a {
    color: var(--text-secondary);
    text-decoration: underline;
    text-decoration-color: rgba(0, 0, 0, 0.15);
    text-underline-offset: 2px;
}

.platform-note a:hover {
    color: var(--text-primary);
}

/* ── Sections ─────────────────────────────────── */
.section {
    padding: 4rem 0;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.section-label {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

/* ── Editorial Text ───────────────────────────── */
.editorial-heading {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
    max-width: 580px;
}

.editorial-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.editorial-body p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 560px;
}

.editorial-intro {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 560px;
    margin-bottom: 2rem;
}

/* ── Feature List ─────────────────────────────── */
.feature-list {
    display: flex;
    flex-direction: column;
}

.feature-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 1.5rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    align-items: baseline;
}

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

.feature-name {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

.feature-desc code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    background: rgba(0,0,0,0.04);
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
    color: var(--accent-coral);
}

/* ── Evidence Demo ────────────────────────────── */
.evidence-demo {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
    overflow-x: auto;
}

.evidence-header-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.evidence-title {
    font-weight: 700;
    font-size: 0.875rem;
}

.evidence-meta {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.evidence-meta code {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    background: rgba(0,0,0,0.04);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
}

.evidence-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    font-family: var(--font-mono);
}

.evidence-table th {
    text-align: left;
    padding: 0.375rem 0.625rem;
    border-bottom: 2px solid rgba(0, 0, 0, 0.06);
    font-weight: 600;
    color: var(--text-tertiary);
    font-family: var(--font-sans);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.evidence-table td {
    padding: 0.375rem 0.625rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    color: var(--text-primary);
}

.evidence-table .pass { color: var(--accent-sage); font-weight: 700; }
.evidence-table .cmd { color: var(--text-tertiary); font-size: 0.75rem; }

.evidence-footer {
    display: flex;
    gap: 2rem;
    padding-top: 0.75rem;
    margin-top: 0.25rem;
    border-top: 1px solid rgba(0, 0, 0, 0.04);
    font-size: 0.75rem;
    color: var(--text-tertiary);
    flex-wrap: wrap;
}

.evidence-footer code {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    background: rgba(0,0,0,0.04);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
}

/* ── Loop List ────────────────────────────────── */
.loop-list {
    list-style: none;
    counter-reset: loop;
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 1.5rem;
}

.loop-list li {
    counter-increment: loop;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: grid;
    grid-template-columns: 24px 140px 1fr;
    gap: 1rem;
    align-items: baseline;
}

.loop-list li:last-child { border-bottom: none; }

.loop-list li::before {
    content: counter(loop);
    font-weight: 800;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    background: rgba(0, 0, 0, 0.03);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.loop-list li strong {
    color: var(--text-primary);
    font-weight: 700;
}

/* ── Context Note ─────────────────────────────── */
.context-note {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    line-height: 1.65;
    max-width: 540px;
}

.context-note strong {
    color: var(--text-secondary);
}

/* ── CTA ──────────────────────────────────────── */
.cta-section {
    padding: 5rem 0 3rem;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.cta-section h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

/* ── Footer ───────────────────────────────────── */
footer {
    text-align: center;
    padding: 3rem 0;
    color: var(--text-tertiary);
    font-size: 0.8125rem;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

footer a:hover { color: var(--text-primary); }

/* ── Responsive ───────────────────────────────── */
@media (max-width: 600px) {
    .hero { padding: 4rem 0 3rem; }
    .hero h1 { font-size: 2.25rem; }
    .section { padding: 3rem 0; }
    .feature-row {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }
    .evidence-header-row { flex-direction: column; }
    .evidence-footer { flex-direction: column; gap: 0.5rem; }
    .terminal-box { font-size: 0.75rem; }
}