/* ── Workbook Landing Page ──────────────────────────────────── */

:root {
    --ln-bg:      oklch(0.97 0.004 42);
    --ln-surface: oklch(0.995 0.002 42);
    --ln-text:    oklch(0.15 0.012 42);
    --ln-muted:   oklch(0.42 0.012 42);
    --ln-dim:     oklch(0.58 0.010 42);
    --ln-border:  oklch(0.88 0.007 42);
    --ln-accent:  oklch(0.65 0.21 42);
    --ln-accent-h:oklch(0.60 0.21 42);
    --ln-accent-bg: oklch(0.95 0.04 42);
    --ln-font:    'Manrope', system-ui, sans-serif;
    --ln-display: 'Barlow Condensed', system-ui, sans-serif;
    --ln-radius:  8px;
    --ln-max:     1120px;

    /* Dark canvas: the hero and the closing block sit on it, the feature
       sections between them stay light. */
    --ln-ink:        oklch(0.17 0.014 42);
    --ln-on-ink:     oklch(0.98 0.004 42);
    --ln-on-ink-mut: oklch(0.76 0.010 42);
    --ln-on-ink-dim: oklch(0.60 0.010 42);
    --ln-ink-line:   oklch(1 0 0 / 0.10);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--ln-font);
    background: var(--ln-ink);
    color: var(--ln-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Nav ───────────────────────────────────────────────────── */

/* Kept a sibling of the hero rather than a child: an `overflow: hidden`
   ancestor would kill position: sticky. Opaque rather than glass — a
   translucent bar samples the white canvas, not the body ink, and washes out. */
.ln-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px clamp(20px, 5vw, 48px);
    background: var(--ln-ink);
    border-bottom: 1px solid oklch(1 0 0 / 0.06);
}

.ln-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font: 700 1.3rem/1 var(--ln-display);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--ln-on-ink);
    text-decoration: none;
}

.ln-nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.ln-nav-links a {
    font: 500 0.85rem/1 var(--ln-font);
    color: var(--ln-on-ink-mut);
    text-decoration: none;
    transition: color 0.15s;
}
.ln-nav-links a:hover { color: var(--ln-on-ink); }

/* ── Buttons ───────────────────────────────────────────────── */

.ln-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font: 600 0.9rem/1 var(--ln-font);
    padding: 12px 28px;
    border-radius: var(--ln-radius);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.12s, background 0.15s;
}
.ln-btn:hover { transform: translateY(-1px); }

.ln-btn--primary {
    background: var(--ln-accent);
    color: oklch(0.99 0 0);
    box-shadow: 0 8px 24px -8px oklch(0.65 0.21 42 / 0.65);
}
.ln-btn--primary:hover { background: var(--ln-accent-h); }

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

.ln-hero-wrap .ln-btn--ghost {
    color: var(--ln-on-ink);
    border-color: oklch(1 0 0 / 0.22);
}
.ln-hero-wrap .ln-btn--ghost:hover {
    border-color: oklch(1 0 0 / 0.45);
    background: oklch(1 0 0 / 0.06);
}

.ln-btn--sm {
    padding: 8px 18px;
    font-size: 0.8rem;
    background: var(--ln-accent);
    color: oklch(0.99 0 0);
}
.ln-btn--sm:hover { background: var(--ln-accent-h); }

.ln-btn--wide { width: 100%; padding: 14px; }

/* ── Hero ──────────────────────────────────────────────────── */

/* Two accent glows over the ink with a faint grid on top. The boundary into
   the light page is a hard edge on purpose: a gradient between ink and the
   page background only ever reads as grey haze. */
.ln-hero-wrap {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(62% 60% at 72% 34%, oklch(0.65 0.21 42 / 0.30), transparent 72%),
        radial-gradient(48% 45% at 8% 4%,   oklch(0.72 0.16 70 / 0.14), transparent 72%),
        var(--ln-ink);
    color: var(--ln-on-ink);
}

.ln-hero-wrap::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(oklch(1 0 0 / 0.035) 1px, transparent 1px),
        linear-gradient(90deg, oklch(1 0 0 / 0.035) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(75% 65% at 50% 30%, #000, transparent 78%);
    pointer-events: none;
}

.ln-hero {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: clamp(32px, 5vw, 64px);
    align-items: center;
    padding: clamp(48px, 8vw, 96px) clamp(20px, 5vw, 48px);
    max-width: 1280px;
    margin: 0 auto;
}

.ln-hero-content {
    max-width: 520px;
}

.ln-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    padding: 6px 14px;
    border: 1px solid oklch(1 0 0 / 0.14);
    border-radius: 999px;
    background: oklch(1 0 0 / 0.05);
    font: 600 0.72rem/1 var(--ln-font);
    letter-spacing: 0.04em;
    color: var(--ln-on-ink-mut);
}

.ln-badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ln-accent);
    box-shadow: 0 0 0 3px oklch(0.65 0.21 42 / 0.25);
}

@media (prefers-reduced-motion: no-preference) {
    .ln-badge-dot { animation: ln-pulse 2.4s ease-in-out infinite; }
}

@keyframes ln-pulse {
    0%, 100% { box-shadow: 0 0 0 3px oklch(0.65 0.21 42 / 0.25); }
    50%      { box-shadow: 0 0 0 6px oklch(0.65 0.21 42 / 0.05); }
}

.ln-hero h1 {
    font: 800 clamp(2.4rem, 5.5vw, 4.2rem)/1.02 var(--ln-display);
    letter-spacing: -0.015em;
    text-transform: uppercase;
    color: var(--ln-on-ink);
}

.ln-hero-accent {
    color: var(--ln-accent);
}

.ln-hero-sub {
    margin-top: 20px;
    font: 400 clamp(0.95rem, 1.5vw, 1.1rem)/1.65 var(--ln-font);
    color: var(--ln-on-ink-mut);
    max-width: 45ch;
}

.ln-hero-actions {
    margin-top: 32px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.ln-hero-img {
    position: relative;
    perspective: 1800px;
}

.ln-hero-img img {
    width: 100%;
    display: block;
    border-radius: 14px;
    border: 1px solid oklch(1 0 0 / 0.10);
    transform: rotateY(-7deg) rotateX(3deg);
    transform-origin: left center;
    box-shadow:
        0 40px 80px -24px oklch(0.02 0 0 / 0.80),
        0 8px 24px -12px oklch(0.02 0 0 / 0.60);
    transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (prefers-reduced-motion: no-preference) {
    .ln-hero-img:hover img { transform: rotateY(-3deg) rotateX(1deg) scale(1.01); }
}

/* ── Section header ────────────────────────────────────────── */

.ln-section-header {
    max-width: var(--ln-max);
    margin: 0 auto;
    padding: 0 clamp(20px, 5vw, 48px);
    margin-bottom: clamp(48px, 6vw, 80px);
}

.ln-eyebrow {
    display: block;
    font: 700 0.7rem/1 var(--ln-display);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ln-accent);
    margin-bottom: 12px;
}

.ln-section-header h2 {
    font: 700 clamp(1.6rem, 3.5vw, 2.4rem)/1.1 var(--ln-display);
    text-transform: uppercase;
    color: var(--ln-text);
    max-width: 20ch;
}

/* ── Features ──────────────────────────────────────────────── */

.ln-features {
    padding: clamp(64px, 10vw, 120px) 0;
    background: var(--ln-bg);
}

.ln-feature {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: clamp(32px, 5vw, 64px);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(20px, 5vw, 48px);
    margin-bottom: clamp(64px, 8vw, 112px);
}

.ln-feature:last-child { margin-bottom: 0; }

.ln-feature--reverse {
    grid-template-columns: 1.3fr 1fr;
}
.ln-feature--reverse .ln-feature-text { order: 2; }
.ln-feature--reverse .ln-feature-img  { order: 1; }

.ln-feature-text h3 {
    font: 700 clamp(1.2rem, 2.5vw, 1.6rem)/1.15 var(--ln-display);
    text-transform: uppercase;
    color: var(--ln-text);
    margin-bottom: 12px;
}

.ln-feature-text p {
    font: 400 0.95rem/1.7 var(--ln-font);
    color: var(--ln-muted);
    max-width: 42ch;
}

.ln-feature-img img {
    width: 100%;
    display: block;
    border-radius: 12px;
    border: 1px solid var(--ln-border);
    box-shadow:
        0 24px 48px -24px oklch(0.10 0.01 42 / 0.30),
        0 4px 12px -6px oklch(0.10 0.01 42 / 0.14);
    transition: transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1), box-shadow 0.4s;
}

@media (prefers-reduced-motion: no-preference) {
    .ln-feature-img img:hover {
        transform: translateY(-4px);
        box-shadow:
            0 32px 64px -24px oklch(0.10 0.01 42 / 0.38),
            0 6px 16px -6px oklch(0.10 0.01 42 / 0.16);
    }
}

/* ── Closing block ─────────────────────────────────────────── */

/* Bookends the hero: the page opens and closes on ink with the light
   feature sections in between. */
.ln-bottom {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(55% 50% at 50% 0%, oklch(0.65 0.21 42 / 0.18), transparent 70%),
        var(--ln-ink);
    color: var(--ln-on-ink);
}

.ln-bottom > * { position: relative; z-index: 1; }

/* ── Points / stats ────────────────────────────────────────── */

.ln-points {
    display: flex;
    justify-content: center;
    gap: clamp(32px, 6vw, 80px);
    padding: clamp(64px, 9vw, 96px) clamp(20px, 5vw, 48px) clamp(32px, 5vw, 48px);
}

.ln-point {
    text-align: center;
}

.ln-point-num {
    display: block;
    font: 800 clamp(1.8rem, 4vw, 2.8rem)/1 var(--ln-display);
    color: var(--ln-accent);
    letter-spacing: -0.01em;
}

.ln-point-label {
    display: block;
    margin-top: 8px;
    font: 500 0.8rem/1.3 var(--ln-font);
    color: var(--ln-on-ink-mut);
    max-width: 16ch;
}

/* ── Contact / CTA ─────────────────────────────────────────── */

.ln-contact {
    padding: clamp(48px, 7vw, 88px) clamp(20px, 5vw, 48px);
}

.ln-contact-content {
    max-width: 560px;
    margin: 0 auto;
}

.ln-contact-content h2 {
    font: 700 clamp(1.8rem, 3.8vw, 2.6rem)/1.1 var(--ln-display);
    text-transform: uppercase;
    color: var(--ln-on-ink);
    margin-bottom: 12px;
}

.ln-contact-content > p {
    font: 400 0.95rem/1.6 var(--ln-font);
    color: var(--ln-on-ink-mut);
    margin-bottom: 32px;
}

.ln-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ln-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.ln-form input {
    font: 400 0.9rem/1 var(--ln-font);
    padding: 14px 16px;
    border: 1px solid oklch(1 0 0 / 0.14);
    border-radius: var(--ln-radius);
    background: oklch(1 0 0 / 0.05);
    color: var(--ln-on-ink);
    outline: none;
    transition: border-color 0.15s, background 0.15s;
}
.ln-form input:focus {
    border-color: var(--ln-accent);
    background: oklch(1 0 0 / 0.08);
}
.ln-form input::placeholder {
    color: var(--ln-on-ink-dim);
}

.ln-sent-msg {
    font: 500 1.05rem/1.6 var(--ln-font);
    color: var(--ln-on-ink-mut);
    margin-top: 8px;
}

/* ── Footer ────────────────────────────────────────────────── */

.ln-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    padding: 32px;
    border-top: 1px solid var(--ln-ink-line);
    font: 500 0.75rem/1 var(--ln-font);
    color: var(--ln-on-ink-dim);
}

.ln-footer span:first-child {
    font-family: var(--ln-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--ln-on-ink-mut);
}

.ln-footer-by {
    color: var(--ln-on-ink-dim);
    text-decoration: none;
}

.ln-footer-by:hover {
    color: var(--ln-on-ink-mut);
    text-decoration: underline;
}

/* ── Scroll reveal ─────────────────────────────────────────── */

/* Scroll-driven animation is a browser feature, so this costs no JS. Browsers
   without it simply show the content, already in its final state. */
@supports (animation-timeline: view()) {
    @media (prefers-reduced-motion: no-preference) {
        .ln-section-header,
        .ln-feature,
        .ln-point,
        .ln-contact-content {
            animation: ln-rise linear both;
            animation-timeline: view();
            animation-range: entry 5% cover 26%;
        }
    }
}

@keyframes ln-rise {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: none; }
}

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 768px) {
    /* The tilt reads as a mistake once the image spans the full width. */
    .ln-hero-img img {
        transform: none;
        border-radius: 12px;
    }

    .ln-badge { font-size: 0.66rem; }

    .ln-hero {
        grid-template-columns: 1fr;
        text-align: left;
    }
    /* Headline first on a phone: the hero now opens on a badge and a big
       type block, and burying those under a screenshot wastes the fold. */
    .ln-hero-content { order: -1; }

    .ln-feature,
    .ln-feature--reverse {
        grid-template-columns: 1fr;
    }
    .ln-feature--reverse .ln-feature-text { order: 1; }
    .ln-feature--reverse .ln-feature-img  { order: -1; }
    .ln-feature .ln-feature-img { order: -1; }

    .ln-points {
        flex-direction: column;
        align-items: center;
        gap: 32px;
    }

    .ln-form-row {
        grid-template-columns: 1fr;
    }

    .ln-nav-links {
        gap: 16px;
    }
    .ln-nav-links a:not(.ln-btn) {
        display: none;
    }
}