/* ============================================
   llmdiff — landing page
   neon cyberpunk split-pane, dual-accent
   ============================================ */

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

:root {
    --bg: #08060f;
    --bg-panel: #0d0b18;
    --bg-elev: #120f20;
    --text: #f1f1fa;
    --text-dim: #a8a6c4;
    --text-muted: #7b7a9b;
    --border: rgba(255, 255, 255, 0.06);
    --border-strong: rgba(255, 255, 255, 0.14);

    --cyan: #22d3ee;
    --cyan-soft: rgba(34, 211, 238, 0.12);
    --cyan-glow: rgba(34, 211, 238, 0.35);

    --magenta: #e879f9;
    --magenta-soft: rgba(232, 121, 249, 0.12);
    --magenta-glow: rgba(232, 121, 249, 0.35);

    --radius: 14px;
    --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Satoshi', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

/* grid background + dual-accent radial glows */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 48px 48px;
    background-position: -1px -1px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse 100% 70% at 50% 30%, #000 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 100% 70% at 50% 30%, #000 30%, transparent 80%);
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(ellipse 45% 40% at 18% 18%, rgba(34, 211, 238, 0.10), transparent 65%),
        radial-gradient(ellipse 45% 40% at 82% 22%, rgba(232, 121, 249, 0.10), transparent 65%),
        radial-gradient(ellipse 60% 30% at 50% 70%, rgba(34, 211, 238, 0.04), transparent 70%);
    pointer-events: none;
}

a {
    color: var(--cyan);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--magenta);
}

::selection {
    background: var(--magenta);
    color: var(--bg);
}

code {
    font-family: var(--font-mono);
    font-size: 0.86em;
    color: var(--cyan);
    background: var(--cyan-soft);
    padding: 0.12em 0.45em;
    border-radius: 5px;
    border: 1px solid rgba(34, 211, 238, 0.15);
}

.page {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem 2rem;
}

/* ============================================
   nav
   ============================================ */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0 2.5rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--text);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.01em;
}

.nav-logo:hover { color: var(--text); }

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-link {
    color: var(--text-dim);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 500;
    text-transform: lowercase;
}

.nav-link:hover { color: var(--text); }

.nav-cta {
    color: var(--bg);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: lowercase;
    padding: 0.55em 1.1em;
    border-radius: 6px;
    background: linear-gradient(90deg, var(--cyan), var(--magenta));
    transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.08) inset,
        0 6px 20px -6px var(--cyan-glow),
        0 6px 20px -6px var(--magenta-glow);
}

.nav-cta:hover {
    color: var(--bg);
    transform: translateY(-2px);
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.12) inset,
        0 10px 28px -6px var(--cyan-glow),
        0 10px 28px -6px var(--magenta-glow);
}

/* ============================================
   hero
   ============================================ */
.hero { padding: 1.5rem 0 4.5rem; }

.hero-inner {
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}

.hero-kicker {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    text-transform: lowercase;
    letter-spacing: 0.18em;
    padding: 0.4em 1em;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-strong);
    margin-bottom: 1.75rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.3rem, 6vw, 4.6rem);
    font-weight: 600;
    letter-spacing: -0.035em;
    line-height: 1.02;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.hero-title .grad-l {
    color: var(--cyan);
    text-shadow: 0 0 24px rgba(34, 211, 238, 0.5);
}

.hero-title .grad-r {
    color: var(--magenta);
    text-shadow: 0 0 24px rgba(232, 121, 249, 0.5);
}

.hero-sub {
    font-size: clamp(1rem, 1.45vw, 1.15rem);
    color: var(--text-dim);
    max-width: 600px;
    margin: 0 auto 2.25rem;
    line-height: 1.6;
}

.hero-cta-row {
    display: flex;
    justify-content: center;
    gap: 0.85rem;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8em 1.6em;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    font-weight: 600;
    text-transform: lowercase;
    letter-spacing: 0.02em;
    border-radius: 6px;
    transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), color 0.2s ease;
}

.btn-primary {
    color: var(--bg);
    background: linear-gradient(90deg, var(--cyan), var(--magenta));
    box-shadow:
        0 8px 24px -8px var(--cyan-glow),
        0 8px 24px -8px var(--magenta-glow);
}

.btn-primary:hover {
    color: var(--bg);
    transform: translateY(-3px);
    box-shadow:
        0 14px 36px -10px var(--cyan-glow),
        0 14px 36px -10px var(--magenta-glow);
}

.btn-ghost {
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border-strong);
}

.btn-ghost:hover {
    color: var(--cyan);
    border-color: var(--cyan);
    transform: translateY(-2px);
    box-shadow: 0 0 20px -4px var(--cyan-glow);
}

/* ============================================
   hero split ascii
   ============================================ */
.hero-split {
    margin: 0 auto;
    max-width: 720px;
    position: relative;
}

.split-art {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.45;
    color: var(--text);
    background:
        linear-gradient(90deg, rgba(34, 211, 238, 0.04) 0%, rgba(34, 211, 238, 0.04) 49%, transparent 49%, transparent 51%, rgba(232, 121, 249, 0.04) 51%, rgba(232, 121, 249, 0.04) 100%),
        var(--bg-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 1.5rem 1.25rem;
    text-align: left;
    overflow-x: auto;
    white-space: pre;
    box-shadow:
        0 0 0 1px var(--border) inset,
        -14px 24px 60px -30px var(--cyan-glow),
        14px 24px 60px -30px var(--magenta-glow);
    position: relative;
}

.split-art::before {
    content: '';
    position: absolute;
    top: 12%;
    bottom: 12%;
    left: 50%;
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.22), transparent);
    transform: translateX(-0.5px);
    pointer-events: none;
}

/* ============================================
   demo colors (shared)
   ============================================ */
.c-dim { color: var(--text-muted); }
.c-cyan { color: var(--cyan); }
.c-magenta { color: var(--magenta); }
.bold { font-weight: 600; }

/* ============================================
   demo section
   ============================================ */
.demo-section {
    padding: 3rem 0 2rem;
    text-align: center;
}

.demo-section h2 {
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 3.8vw, 2.4rem);
    font-weight: 600;
    letter-spacing: -0.025em;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.section-sub {
    color: var(--text-dim);
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 0.95rem;
}

.demo {
    font-family: var(--font-mono);
    font-size: 12.5px;
    line-height: 1.55;
    color: var(--text);
    background: var(--bg-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    text-align: left;
    overflow-x: auto;
    white-space: pre;
    box-shadow:
        0 0 0 1px var(--border) inset,
        0 24px 60px -30px rgba(0, 0, 0, 0.8);
}

.demo-wide {
    max-width: 860px;
    margin: 0 auto;
    box-shadow:
        0 0 0 1px var(--border) inset,
        -10px 20px 50px -28px var(--cyan-glow),
        10px 20px 50px -28px var(--magenta-glow);
}

/* ============================================
   features grid
   ============================================ */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 1rem;
    padding: 4rem 0 3rem;
}

.feature {
    position: relative;
    padding: 1.75rem 1.6rem 1.5rem;
    background: var(--bg-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
    overflow: hidden;
}

.feature::before {
    content: '';
    position: absolute;
    inset: 0 0 auto 0;
    height: 1px;
    opacity: 0.6;
}

.feat-cyan::before { background: linear-gradient(90deg, transparent, var(--cyan), transparent); }
.feat-magenta::before { background: linear-gradient(90deg, transparent, var(--magenta), transparent); }

.feat-cyan:hover {
    transform: translateY(-4px);
    border-color: rgba(34, 211, 238, 0.45);
    box-shadow: 0 20px 40px -24px var(--cyan-glow), 0 0 0 1px rgba(34, 211, 238, 0.2) inset;
}

.feat-magenta:hover {
    transform: translateY(-4px);
    border-color: rgba(232, 121, 249, 0.45);
    box-shadow: 0 20px 40px -24px var(--magenta-glow), 0 0 0 1px rgba(232, 121, 249, 0.2) inset;
}

.feature-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.feat-cyan .feature-icon {
    color: var(--cyan);
    background: var(--cyan-soft);
    border: 1px solid rgba(34, 211, 238, 0.22);
}

.feat-magenta .feature-icon {
    color: var(--magenta);
    background: var(--magenta-soft);
    border: 1px solid rgba(232, 121, 249, 0.22);
}

.feature-icon svg { width: 18px; height: 18px; }

.feature h3 {
    font-family: var(--font-display);
    font-size: 1.08rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.feature p {
    color: var(--text-dim);
    font-size: 0.92rem;
    line-height: 1.55;
}

.feat-magenta code {
    color: var(--magenta);
    background: var(--magenta-soft);
    border-color: rgba(232, 121, 249, 0.2);
}

.note-inline {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ============================================
   why section
   ============================================ */
.why {
    padding: 3rem 0;
}

.why-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 2rem 1.85rem;
    background: var(--bg-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    position: relative;
    box-shadow:
        -8px 0 0 -7px var(--cyan),
        8px 0 0 -7px var(--magenta);
}

.why h2 {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 3vw, 1.85rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 1rem;
}

.why p {
    color: var(--text-dim);
    font-size: 0.98rem;
    line-height: 1.65;
    margin-bottom: 0.85rem;
}

.why p:last-child { margin-bottom: 0; }

/* ============================================
   install
   ============================================ */
.install { padding: 3rem 0 2rem; }

.install h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.4rem);
    font-weight: 600;
    letter-spacing: -0.025em;
    margin-bottom: 2rem;
    color: var(--text);
    text-align: center;
}

.install-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 1rem;
}

.install-card {
    padding: 1.5rem 1.5rem 1.35rem;
    background: var(--bg-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    position: relative;
}

.card-cyan { box-shadow: inset 3px 0 0 var(--cyan), 0 0 0 1px rgba(34, 211, 238, 0.08); }
.card-magenta { box-shadow: inset -3px 0 0 var(--magenta), 0 0 0 1px rgba(232, 121, 249, 0.08); }
.card-mid {
    box-shadow:
        inset 3px 0 0 var(--cyan),
        inset -3px 0 0 var(--magenta);
}

.install-card h3 {
    font-family: var(--font-display);
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-transform: lowercase;
}

.soon {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--magenta);
    background: var(--magenta-soft);
    border: 1px solid rgba(232, 121, 249, 0.25);
    padding: 0.15em 0.55em;
    border-radius: 4px;
    text-transform: lowercase;
    font-weight: 500;
    letter-spacing: 0.08em;
}

.install-card pre {
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    padding: 0.85rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--cyan);
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    flex: 1;
}

.card-magenta pre { color: var(--magenta); }

.install-card .note {
    margin-top: 0.85rem;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    line-height: 1.55;
}

.install-card code {
    background: transparent;
    padding: 0;
    color: inherit;
    border: 0;
}

/* ============================================
   footer
   ============================================ */
.footer {
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan), var(--magenta), transparent);
    opacity: 0.35;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: lowercase;
}

.footer-links {
    display: flex;
    gap: 1.4rem;
}

.footer-links a {
    color: var(--text-dim);
}

.footer-links a:hover { color: var(--magenta); }

/* ============================================
   mobile
   ============================================ */
@media (max-width: 720px) {
    .page { padding: 0.85rem 1rem; }
    .nav { padding: 0.5rem 0 1.25rem; }
    .nav-logo span { display: none; }
    .hero { padding: 0.5rem 0 2.5rem; }
    .hero-kicker { font-size: 0.66rem; letter-spacing: 0.14em; }
    .hero-sub { font-size: 0.95rem; }
    .split-art { font-size: 9.5px; padding: 1rem 0.75rem; }
    .demo { font-size: 10px; padding: 0.85rem 0.9rem; }
    .demo-wide { font-size: 9px; }
    .features { padding: 2rem 0 1rem; grid-template-columns: 1fr; gap: 0.8rem; }
    .feature { padding: 1.3rem 1.3rem 1.15rem; }
    .why { padding: 1.5rem 0; }
    .why-inner { padding: 1.5rem 1.3rem; }
    .install { padding: 2rem 0 1rem; }
    .install-grid { grid-template-columns: 1fr; }
    .footer { padding: 2rem 0 1rem; margin-top: 2rem; }
    .footer-inner { flex-direction: column; align-items: flex-start; }
}