/* FlowTutor landing page — brand tokens match the product's styled surfaces
   (amber #d97706 accent, ink #0e1116) from backend/src/index.ts. No build step. */

:root {
  --accent: #d97706;
  --accent-dark: #b45309;
  --ink: #0e1116;
  --body: #3b4250;
  --muted: #6b7280;
  --line: #e7e3dc;
  --bg: #fffdf9;
  --bg-alt: #fbf5ec;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 10px 30px -12px rgba(14, 17, 22, 0.18);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--body);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { color: var(--ink); line-height: 1.15; letter-spacing: -0.02em; }

a { color: inherit; text-decoration: none; }

em { font-style: normal; color: var(--accent); }

code { font-family: var(--mono); font-size: 0.9em; }

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(217, 119, 6, 0.6);
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---- Header ---- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.mark {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #f4b350);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.4);
}
.nav { display: flex; align-items: center; gap: 1.5rem; font-weight: 500; font-size: 0.95rem; }
.nav > a:not(.btn):hover { color: var(--accent); }

/* ---- Hero ---- */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 3rem;
  align-items: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.3rem); margin: 0 0 1rem; }
.lede { font-size: 1.12rem; margin: 0 0 1.75rem; max-width: 34ch; }
.signup { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 0.85rem; max-width: 30rem; }
.signup input {
  flex: 1 1 14rem;
  min-width: 0;
  padding: 0.7rem 0.95rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.signup input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.18);
}
.signup .btn { white-space: nowrap; cursor: pointer; }
.signup .btn:disabled { opacity: 0.6; cursor: default; }
.fine { font-size: 0.85rem; color: var(--muted); margin: 0; min-height: 1.4em; }

/* ---- Hero mock ---- */
.mock {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 0.85rem;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem;
  box-shadow: var(--shadow);
}
.mock-code {
  background: #0e1116;
  border-radius: 10px;
  padding: 0.75rem 0.85rem 0.95rem;
  overflow: hidden;
}
.mock-bar { display: flex; gap: 6px; margin-bottom: 0.7rem; }
.mock-bar span { width: 10px; height: 10px; border-radius: 50%; background: #3a3f4b; }
.mock-bar span:first-child { background: #e0695f; }
.mock-code pre { margin: 0; }
.mock-code code {
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.65;
  color: #d6dbe5;
  white-space: pre;
}
.mock-code .ln { color: var(--accent); font-weight: 600; }
.mock-side { display: flex; flex-direction: column; gap: 0.6rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
}
.card .tag {
  display: block;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-dark);
  margin-bottom: 0.25rem;
}
.card p { margin: 0; font-size: 0.78rem; color: var(--body); line-height: 1.45; }
.card code { background: var(--bg-alt); padding: 0 0.2em; border-radius: 4px; }

/* ---- Sections ---- */
.section { max-width: 1080px; margin: 0 auto; padding: 4rem 1.5rem; }
.section-alt { max-width: none; background: var(--bg-alt); border-block: 1px solid var(--line); }
.section-alt > * { max-width: 1080px; margin-inline: auto; }
.section h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin: 0 0 2rem; }
.section-alt h2 { padding-inline: 1.5rem; }
.section-lede { font-size: 1.05rem; margin: -1.25rem 0 2rem; color: var(--muted); }

/* ---- Steps ---- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
.steps li { position: relative; padding-top: 0.5rem; }
.step-num {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.steps h3 { font-size: 1.1rem; margin: 0 0 0.4rem; }
.steps p { margin: 0; }

/* ---- Feature grid ---- */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; padding-inline: 1.5rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
}
.feature h3 { font-size: 1.08rem; margin: 0 0 0.45rem; display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.feature p { margin: 0; }

/* "Experimental" / status pill on a feature heading */
.badge {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-dark);
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.12rem 0.5rem;
}

/* ---- Pricing ---- */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.tier {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem 1.5rem;
  display: flex;
  flex-direction: column;
}
.tier-featured { border-color: var(--accent); box-shadow: var(--shadow); }
.tier h3 { font-size: 1.15rem; margin: 0 0 0.5rem; }
.price { font-size: 2rem; font-weight: 800; color: var(--ink); margin: 0 0 1rem; }
.price span { font-size: 1rem; font-weight: 500; color: var(--muted); }
.tier ul { list-style: none; margin: 0 0 1.5rem; padding: 0; flex: 1; }
.tier li { padding: 0.35rem 0 0.35rem 1.5rem; position: relative; font-size: 0.95rem; }
.tier li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* ---- Long-form doc pages (privacy / terms) ---- */
.doc { max-width: 720px; margin: 0 auto; padding: 3rem 1.5rem 4rem; }
.doc h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); margin: 0 0 0.25rem; }
.doc .updated { color: var(--muted); font-size: 0.9rem; margin: 0 0 2rem; }
.doc h2 { font-size: 1.25rem; margin: 2.25rem 0 0.6rem; }
.doc p, .doc li { font-size: 1rem; }
.doc ul { padding-left: 1.25rem; }
.doc li { margin: 0.35rem 0; }
.doc ul ul { margin-top: 0.35rem; }
.doc code { background: var(--bg-alt); padding: 0 0.25em; border-radius: 4px; }
.doc a { color: var(--accent-dark); text-decoration: underline; }
.doc .back { display: inline-block; margin-bottom: 2rem; font-weight: 600; color: var(--accent-dark); }

/* ---- Footer ---- */
.site-footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
}
.foot-brand { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--ink); }
.foot-links { display: flex; gap: 1.25rem; margin-left: auto; font-weight: 500; }
.foot-links a:hover { color: var(--accent); }
.muted { color: var(--muted); }
.copyright { width: 100%; margin: 0; font-size: 0.85rem; }

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding-top: 1.5rem; }
  .mock { order: 2; }
  .lede { max-width: none; }
  .steps { grid-template-columns: 1fr; gap: 1.25rem; }
  .grid { grid-template-columns: 1fr; }
  .tiers { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav a:not(.btn) { display: none; }
  .foot-links { margin-left: 0; }
}