/* Landing page. Dark on purpose: it is a one-off showcase, the app itself defaults to light (see DESIGN.md). */
:root {
  --bg: #0C1012;
  --surface: #141A1D;
  --surface-2: #1B2226;
  --line: #263036;
  --ink: #E9EEF0;
  --muted: #9AA6AD;
  --accent: #2FC2B0;
  --accent-ink: #5CD4C5;
  --on-accent: #06201C;
  --warn: #E8A23A;
  --ok: #45C486;
  --wa-in: #202C33;
  --wa-out: #005C4B;
  --font: "Satoshi", "Segoe UI", system-ui, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
h1, h2, h3, p { margin: 0; }
a { color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.skip { position: absolute; left: -9999px; top: 8px; z-index: 50; background: var(--surface); color: var(--ink); padding: 8px 12px; }
.skip:focus { left: 8px; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px;
  border-radius: 999px; border: 1px solid var(--line); font-weight: 700; font-size: 0.95rem; text-decoration: none;
  color: var(--ink); background: transparent; transition: background-color 150ms ease, transform 150ms ease;
}
.btn:hover { background: var(--surface-2); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent); filter: brightness(1.08); }
.btn-lg { min-height: 54px; padding: 0 28px; font-size: 1.05rem; }
.btn:active { transform: translateY(1px); }

/* nav: the one translucent surface on the page */
.nav {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px clamp(16px, 4vw, 40px); background: rgb(12 16 18 / 0.78); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgb(38 48 54 / 0.6);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 900; font-size: 1.15rem; }
.brand .logo { width: 36px; height: auto; color: var(--ink); }
.foot-brand { display: inline-flex; align-items: center; gap: 8px; }
.foot-brand .logo { width: 24px; height: auto; color: var(--ink); }
.nav-links { display: flex; gap: 4px; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 500; padding: 8px 12px; border-radius: 999px; }
.nav-links a:hover { color: var(--ink); background: var(--surface-2); }
.nav-cta { display: flex; gap: 8px; }

/* hero */
.hero { position: relative; overflow: hidden; padding: clamp(56px, 9vw, 104px) 16px 72px; text-align: center; }
.hero-kicker { color: var(--muted); font-weight: 500; margin-bottom: 18px; }
.hero-title { font-size: clamp(2.6rem, 7vw, 5.4rem); font-weight: 900; letter-spacing: -0.04em; line-height: 1.02; }
.hero-mascots { display: inline-flex; gap: 2px; vertical-align: -0.12em; padding: 6px 10px; border-radius: 22px; background: var(--surface-2); border: 1px solid var(--line); }
.hero-mascots svg { width: clamp(28px, 4.4vw, 54px); height: auto; }
.hero-lede { max-width: 720px; margin: 24px auto 0; color: var(--muted); font-size: clamp(1.05rem, 1.6vw, 1.25rem); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 32px; }
.hero-note { margin-top: 14px; color: var(--muted); font-size: 0.875rem; }

/* animated product window */
.window {
  max-width: 1080px; margin: 56px auto 0; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; text-align: left;
  background: var(--surface); box-shadow: 0 30px 80px rgb(0 0 0 / 0.45);
}
.window-bar { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--surface-2); }
.dots { display: inline-flex; gap: 6px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.window-title { flex: 1; color: var(--muted); font-size: 0.875rem; font-weight: 500; }
.window-body { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); min-height: 340px; }
.chat { display: flex; flex-direction: column; gap: 12px; padding: 24px; background: #0B141A; }
.bubble {
  max-width: 88%; padding: 8px 12px 6px; border-radius: 10px; white-space: pre-line; font-size: 0.95rem; line-height: 1.45;
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}
.bubble.in { align-self: flex-start; background: var(--wa-in); border-top-left-radius: 2px; }
.bubble.out { align-self: flex-end; background: var(--wa-out); border-top-right-radius: 2px; }
.meta { display: block; text-align: right; font-size: 0.72rem; color: rgb(255 255 255 / 0.68); margin-top: 2px; }
.work { list-style: none; margin: 0; padding: 20px; display: grid; gap: 10px; align-content: start; border-left: 1px solid var(--line); }
.work-head { font-size: 0.8rem; font-weight: 700; color: var(--muted); }
.work-row { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 12px; align-items: start; padding: 12px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); font-size: 0.93rem; }
.work-row b { color: var(--ink); }
.work-row div { color: var(--muted); }
small { display: block; color: var(--muted); font-size: 0.8rem; margin-top: 2px; }

/* sections */
.section { max-width: 1120px; margin: 0 auto; padding: clamp(64px, 9vw, 112px) 16px 0; }
.section-title { font-size: clamp(2rem, 4.4vw, 3.2rem); font-weight: 900; letter-spacing: -0.03em; line-height: 1.08; }
.section-lede { max-width: 680px; margin-top: 14px; color: var(--muted); font-size: 1.08rem; }

/* flow */
.flow { list-style: none; margin: 48px 0 0; padding: 0; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 14px; }
.flow-node { position: relative; display: grid; justify-items: center; align-content: start; text-align: center; gap: 6px; z-index: 1; }
.flow-node > span:first-child { display: grid; place-items: center; width: 68px; height: 68px; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); transition: border-color 300ms ease, background-color 300ms ease; }
.flow-node.on > span:first-child { border-color: var(--accent); background: var(--surface-2); transition-delay: 320ms; }
/* each node draws the segment from the previous box to itself, then lights up once the line arrives */
.flow-node + .flow-node::before, .flow-node + .flow-node::after {
  content: ""; position: absolute; top: 34px; left: calc(-50% + 20px); right: calc(50% + 34px); height: 2px; background: var(--line);
}
.flow-node + .flow-node::after { background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform 320ms ease-out; }
.flow-node.on + .flow-node.on::after { transform: scaleX(1); }
.flow-node b { font-size: 0.98rem; }
.flow-icon { color: var(--ink); }

/* feature cards */
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 44px; }
.card { position: relative; display: flex; flex-direction: column; gap: 10px; padding: 22px; border-radius: 22px; background: var(--surface); border: 1px solid var(--line); }
.card-wide { grid-column: span 2; }
.card-tall { grid-row: span 2; }
.card h3 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; margin-top: 6px; }
.card > p { color: var(--muted); font-size: 0.97rem; }
.card .replay { position: absolute; top: 16px; right: 16px; }
.demo { display: flex; flex-direction: column; gap: 10px; padding: 18px; border-radius: 16px; background: #0B141A; min-height: 200px; }
.plan { padding: 14px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); }
.plan-title { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 0.93rem; }
.plan ol { margin: 10px 0 0; padding-left: 52px; color: var(--muted); display: grid; gap: 4px; font-size: 0.93rem; }
.verdict { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 12px; padding: 12px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--ok); }
.graph { display: grid; gap: 10px; padding: 18px; border-radius: 16px; background: var(--surface-2); }
.g-node { position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: center; padding: 12px 14px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.g-node:not(:has(span)) { grid-template-columns: minmax(0, 1fr); }
.g-node + .g-node::before { content: ""; position: absolute; left: 50%; top: -11px; height: 10px; border-left: 2px dashed var(--line); }
.g-node small { margin: 0; }
.g-node em { display: block; font-style: normal; color: var(--warn); font-size: 0.85rem; }
.g-node.warn { border-color: var(--warn); }
.g-node.ok { border-color: var(--ok); }
.desk-card { padding: 16px; border-radius: 16px; background: var(--surface-2); border: 1px solid var(--line); display: grid; gap: 10px; }
.desk-kind { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.desk-reason { color: var(--muted); font-size: 0.93rem; }
.desk-actions { display: flex; gap: 8px; justify-content: flex-end; }
.fake-btn { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); font-size: 0.85rem; font-weight: 700; transition: transform 150ms ease, box-shadow 150ms ease; }
.fake-btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.fake-btn.pressed { transform: scale(0.94); box-shadow: 0 0 0 4px rgb(47 194 176 / 0.25); }
.desk-done { color: var(--ok); font-weight: 700; font-size: 0.9rem; }
.chain { display: grid; gap: 10px; padding: 18px; border-radius: 16px; background: var(--surface-2); }
.chain-item { position: relative; padding: 12px 14px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.chain-item small { display: inline; margin-left: 8px; }
.tag-limit { position: absolute; right: 12px; top: 12px; font-size: 0.75rem; font-weight: 700; color: var(--warn); opacity: 0; transition: opacity 300ms ease 600ms; }
.chain-item.on .tag-limit { opacity: 1; }
.chain-item.active { border-color: var(--accent); }
.replay { min-height: 32px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); font: 600 0.8rem var(--font); cursor: pointer; }
.replay:hover { color: var(--ink); }

/* guardrails, stats, faq */
.guards { list-style: none; margin: 36px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.guards li { padding: 22px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); color: var(--muted); }
.guards b { display: block; color: var(--ink); font-size: 1.05rem; margin-bottom: 6px; }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-top: 36px; }
.stat { padding: 24px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); }
.stat b { display: block; font-size: clamp(2.2rem, 4vw, 3.2rem); font-weight: 900; letter-spacing: -0.03em; line-height: 1; }
.stat span { display: block; margin-top: 10px; color: var(--muted); }
.fineprint { margin-top: 18px; max-width: 820px; color: var(--muted); font-size: 0.9rem; }
.faq { margin-top: 32px; display: grid; gap: 10px; max-width: 860px; }
.faq details { border-radius: 16px; background: var(--surface); border: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 22px; font-weight: 700; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-weight: 400; font-size: 1.3rem; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq p { padding: 0 22px 20px; color: var(--muted); }
.final { max-width: 1120px; margin: clamp(72px, 10vw, 120px) auto 0; padding: 56px 16px; text-align: center; border-top: 1px solid var(--line); }
.final h2 { font-size: clamp(2rem, 4.4vw, 3rem); font-weight: 900; letter-spacing: -0.03em; }
.final p { margin: 12px auto 28px; color: var(--muted); max-width: 560px; }
.foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding: 24px clamp(16px, 4vw, 40px); border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }

/* motion: steps appear in order when their section scrolls into view */
.js .step { opacity: 0; transform: translateY(10px); transition: opacity 420ms ease, transform 420ms ease; }
.js .step.on { opacity: 1; transform: none; }
/* flow nodes stay in place, dimmed, until the line reaches them */
.js .flow .step { opacity: 0.4; transform: none; transition: opacity 300ms ease 320ms; }
.js .flow .step.on { opacity: 1; }
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 600ms ease, transform 600ms ease; }
.js .reveal.seen { opacity: 1; transform: none; }

/* responsive */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .window-body { grid-template-columns: minmax(0, 1fr); }
  .work { border-left: 0; border-top: 1px solid var(--line); }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 28px; }
  .flow-node + .flow-node::before, .flow-node + .flow-node::after { display: none; }
  .grid, .guards { grid-template-columns: minmax(0, 1fr); }
  .card-wide, .card-tall { grid-column: auto; grid-row: auto; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  .nav-cta .btn-ghost { display: none; }
  .flow { grid-template-columns: minmax(0, 1fr); }
  .hero-mascots { display: flex; width: fit-content; margin: 12px auto; }
  .stats { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .step, .js .reveal { opacity: 1; transform: none; transition: none; }
  .flow-node + .flow-node::after { transition: none; }
  .fake-btn, .tag-limit, .flow-node > span:first-child { transition: none; }
  .replay { display: none; }
}