/* Colours, type, spacing, shapes and shadows come only from design-system tokens
   (@osmanbits/design-tokens: studio brand, studio style). Tints are color-mix() of tokens. */
*, *::before, *::after { box-sizing: border-box; }
:root {
  --ob-accent: var(--semantic-action-primary-bg);
  --ob-tint: color-mix(in srgb, var(--semantic-action-primary-bg) 8%, var(--semantic-bg-canvas));
  --ob-tint-strong: color-mix(in srgb, var(--semantic-action-primary-bg) 16%, var(--semantic-bg-surface));
}
html { background: var(--semantic-bg-canvas); color: var(--semantic-text-primary); scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  margin: 0;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-md);
  line-height: var(--font-line-height-normal);
  background: var(--semantic-bg-canvas);
  color: var(--semantic-text-primary);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--semantic-text-link); }
.wrap { width: 100%; max-width: 72rem; margin: 0 auto; padding-inline: var(--space-6); }
.wrap.narrow { max-width: 48rem; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: var(--space-4); top: -4rem; background: var(--semantic-bg-surface); color: var(--semantic-text-link); padding: var(--space-2) var(--space-4); border-radius: var(--style-shape-control); z-index: 20; }
.skip:focus { top: var(--space-2); }
:focus-visible { outline: var(--style-focus-ring-width) solid var(--style-focus-ring-color); outline-offset: var(--style-focus-ring-offset); }

/* Header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--semantic-bg-surface) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: var(--style-border-width-container) solid var(--style-border-color-divider);
}
.bar { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; justify-content: space-between; padding-block: var(--space-3); }
.brand { display: inline-flex; align-items: center; gap: var(--space-2); font-size: var(--font-size-lg); font-weight: var(--font-weight-medium); color: var(--semantic-text-primary); text-decoration: none; }
.brand b, .foot-brand b { color: var(--ob-accent); font-weight: var(--font-weight-bold); }
.brand-mark { width: 2rem; height: 2rem; }
.bm-bg { fill: var(--ob-accent); }
.bm-fg { fill: var(--semantic-action-primary-fg); }
.nav { display: flex; gap: var(--space-6); }
.nav a { color: var(--semantic-text-secondary); text-decoration: none; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); padding-block: var(--space-2); }
.nav a:hover { color: var(--semantic-text-primary); }
.tools { display: flex; gap: var(--space-2); }
select {
  font: inherit; font-size: var(--font-size-sm);
  min-height: var(--size-touch-target); padding-inline: var(--space-3);
  color: var(--semantic-text-primary); background: var(--semantic-bg-surface);
  border: var(--style-border-width-control) solid var(--style-border-color-control);
  border-radius: var(--style-shape-field);
}
@media (max-width: 52rem) { .nav { display: none; } }

/* Hero */
.hero {
  padding-block: var(--space-12);
  background:
    radial-gradient(60rem 30rem at 85% -10%, var(--ob-tint-strong), transparent 60%),
    radial-gradient(40rem 24rem at -10% 110%, var(--ob-tint), transparent 60%);
}
.hero-grid { display: grid; gap: var(--space-8); align-items: center; grid-template-columns: 1.1fr 1fr; }
@media (max-width: 52rem) { .hero-grid { grid-template-columns: 1fr; } .hero-art { order: -1; max-width: 22rem; } }
.eyebrow, .kicker {
  display: inline-block; margin: 0 0 var(--space-3);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-bold);
  letter-spacing: .06em; text-transform: uppercase; color: var(--semantic-text-link);
}
h1 { font-size: clamp(2.1rem, 1.4rem + 3vw, 3.4rem); line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 var(--space-4); }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.3rem); line-height: var(--font-line-height-tight); letter-spacing: -0.015em; margin: 0 0 var(--space-8); max-width: 36rem; }
h3 { font-size: var(--font-size-lg); line-height: var(--font-line-height-tight); margin: 0 0 var(--space-2); }
.lead { font-size: var(--font-size-lg); color: var(--semantic-text-secondary); max-width: 38rem; margin: 0 0 var(--space-6); }
.actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-6); }
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: var(--size-touch-target); padding-inline: var(--space-6);
  border-radius: var(--style-shape-control); text-decoration: none; font-weight: var(--font-weight-medium);
  border: var(--style-border-width-control) solid transparent;
  transition: background var(--style-motion-duration-short) var(--style-motion-easing-standard), transform var(--style-motion-duration-short) var(--style-motion-easing-standard);
}
.button:hover { transform: translateY(-1px); }
.button.primary { background: var(--semantic-action-primary-bg); color: var(--semantic-action-primary-fg); box-shadow: var(--style-elevation-1); }
.button.primary:hover { background: var(--semantic-action-primary-hover); }
.button.ghost { color: var(--semantic-text-primary); border-color: var(--style-border-color-control); background: var(--semantic-bg-surface); }
.button.inverse { background: var(--semantic-bg-surface); color: var(--semantic-text-link); font-size: var(--font-size-lg); }
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
.chips li {
  font-size: var(--font-size-sm); color: var(--semantic-text-secondary);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-pill);
  background: var(--semantic-bg-surface); border: var(--style-border-width-container) solid var(--style-border-color-container);
}
.chips li::before { content: "✓"; color: var(--semantic-status-success-fg); margin-inline-end: var(--space-1); font-weight: var(--font-weight-bold); }

/* Hero illustration (inline SVG, token colours) */
.art { width: 100%; height: auto; display: block; }
.a-blob { fill: var(--ob-tint-strong); }
.a-card > rect:first-child, .a-phone > rect:first-child, .a-pad > rect:first-child { fill: var(--semantic-bg-surface-raised); stroke: var(--style-border-color-container); stroke-width: 1.5; }
.a-phone > rect:first-child { fill: var(--semantic-bg-inverse); stroke: none; }
.a-screen { fill: var(--semantic-bg-surface); }
.a-line { fill: var(--semantic-text-primary); opacity: .75; }
.a-line.soft { fill: var(--semantic-text-secondary); opacity: .35; }
.a-dot, .a-btn, .a-bar.accent { fill: var(--ob-accent); }
.a-bar { fill: color-mix(in srgb, var(--ob-accent) 35%, var(--semantic-bg-surface)); }
.a-key { fill: var(--semantic-text-secondary); }
.a-card, .a-phone, .a-pad { filter: drop-shadow(0 6px 14px rgb(0 0 0 / .12)); }

/* Sections */
.section { padding-block: calc(var(--space-12) * 1.4); }
.section.tint { background: var(--ob-tint); border-block: var(--style-border-width-container) solid var(--style-border-color-divider); }
.grid { display: grid; gap: var(--space-6); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }
.card {
  background: var(--semantic-bg-surface-raised);
  border: var(--style-border-width-container) solid var(--style-border-color-container);
  border-radius: var(--style-shape-container);
  padding: calc(var(--style-density-container-padding) * 1.25);
  box-shadow: var(--style-elevation-1);
  transition: box-shadow var(--style-motion-duration-medium) var(--style-motion-easing-standard), transform var(--style-motion-duration-medium) var(--style-motion-easing-standard);
}
.card:hover { box-shadow: var(--style-elevation-2); transform: translateY(-2px); }
.card p { margin: 0 0 var(--space-4); color: var(--semantic-text-secondary); }
.icon {
  display: inline-grid; place-items: center; width: 3rem; height: 3rem; margin-bottom: var(--space-4);
  border-radius: var(--radius-md); background: var(--ob-tint-strong); color: var(--ob-accent);
}
.icon.small { width: 2.5rem; height: 2.5rem; margin: 0; flex: none; }
.icon svg { width: 1.5rem; height: 1.5rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon circle[r=".9"] { fill: currentColor; }
.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.ticks li { position: relative; padding-inline-start: var(--space-6); font-size: var(--font-size-sm); color: var(--semantic-text-primary); }
.ticks li::before { content: ""; position: absolute; inset-inline-start: 0; top: .45em; width: .7rem; height: .4rem; border-inline-start: 2px solid var(--ob-accent); border-bottom: 2px solid var(--ob-accent); transform: rotate(-45deg); }

/* Steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-6); grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); counter-reset: none; }
.step { position: relative; background: var(--semantic-bg-surface); border: var(--style-border-width-container) solid var(--style-border-color-container); border-radius: var(--style-shape-container); padding: calc(var(--style-density-container-padding) * 1.25); }
.step p { margin: 0; color: var(--semantic-text-secondary); }
.num {
  display: inline-grid; place-items: center; width: 2.25rem; height: 2.25rem; margin-bottom: var(--space-3);
  border-radius: var(--radius-pill); background: var(--ob-accent); color: var(--semantic-action-primary-fg);
  font-weight: var(--font-weight-bold);
}

/* Values */
.value { display: flex; gap: var(--space-4); align-items: flex-start; padding: var(--space-4) 0; }
.value p { margin: 0; color: var(--semantic-text-secondary); }

/* FAQ */
.faq { display: grid; gap: var(--space-3); }
.faq details {
  background: var(--semantic-bg-surface); border: var(--style-border-width-container) solid var(--style-border-color-container);
  border-radius: var(--style-shape-container); padding: 0 var(--space-6);
}
.faq summary {
  cursor: pointer; list-style: none; min-height: var(--size-touch-target);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  font-weight: var(--font-weight-medium); padding-block: var(--space-3);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: var(--font-size-xl); color: var(--ob-accent); line-height: 1; transition: transform var(--style-motion-duration-short) var(--style-motion-easing-standard); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 var(--space-4); color: var(--semantic-text-secondary); }

/* Call to action */
.cta { padding-block: var(--space-12); }
.cta-box {
  display: flex; flex-wrap: wrap; gap: var(--space-6); align-items: center; justify-content: space-between;
  background: var(--semantic-action-primary-bg); color: var(--semantic-action-primary-fg);
  border-radius: var(--radius-lg); padding: var(--space-8) var(--space-8);
  box-shadow: var(--style-elevation-2);
  background-image: radial-gradient(30rem 14rem at 100% 0%, color-mix(in srgb, var(--semantic-action-primary-fg) 14%, transparent), transparent 70%);
}
.cta-box h2 { margin: 0 0 var(--space-2); }
.cta-box p { margin: 0; opacity: .92; max-width: 34rem; }

/* Footer */
.foot { padding-block: var(--space-8); border-top: var(--style-border-width-container) solid var(--style-border-color-divider); color: var(--semantic-text-secondary); font-size: var(--font-size-sm); }
.foot-grid { display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-8); align-items: center; justify-content: space-between; }
.foot-brand { margin: 0; font-size: var(--font-size-lg); color: var(--semantic-text-primary); font-weight: var(--font-weight-medium); }
.foot-nav { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.foot-nav a { color: var(--semantic-text-secondary); text-decoration: none; }
.foot-nav a:hover { color: var(--semantic-text-primary); text-decoration: underline; }
.foot-note { margin: 0; flex-basis: 100%; }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } .card:hover, .button:hover { transform: none; } }