/* grains.run landing redesign — "sedimentation" direction */
:root {
  --paper: #f7f7f4;
  --ink: #10131a;
  --mut: #5a6070;
  --blue: #0b52f5;
  --blue-deep: #0a37a8;
  --line: #e2e3dc;
  --card: #fdfdfb;
  --ok: #0c7a4a;
  --mono: "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
  --disp: "Futura", "Avenir Next", "Trebuchet MS", system-ui, sans-serif;
  --body: "Avenir Next", Charter, "Segoe UI", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0a1024; --ink: #eef1f8; --mut: #93a0aa; --line: #1c2542;
    --card: #0e1530; --blue: #3f77ff; --blue-deep: #7aa0ff; --ok: #34c98a;
  }
}
:root[data-theme="dark"] {
  --paper: #0a1024; --ink: #eef1f8; --mut: #93a0aa; --line: #1c2542;
  --card: #0e1530; --blue: #3f77ff; --blue-deep: #7aa0ff; --ok: #34c98a;
}
:root[data-theme="light"] {
  --paper: #f7f7f4; --ink: #10131a; --mut: #5a6070; --line: #e2e3dc;
  --card: #fdfdfb; --blue: #0b52f5; --blue-deep: #0a37a8; --ok: #0c7a4a;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 17px/1.6 var(--body);
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

/* nav */
.nav {
  position: absolute; inset: 0 0 auto 0; z-index: 5;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.1rem clamp(1rem, 4vw, 3rem);
}
.nav .brand { font-family: var(--disp); font-weight: 700; letter-spacing: -0.02em;
  font-size: 1.15rem; color: var(--ink); display: flex; gap: .5rem; align-items: center; }
.nav .brand svg { display: block; }
.nav .links { display: flex; gap: 1.5rem; align-items: center; font-size: .95rem; }
.nav .links a { color: var(--ink); }
.theme-btn { background: none; border: 1px solid var(--line); color: var(--ink);
  font: .75rem var(--mono); padding: .35rem .7rem; cursor: pointer; border-radius: 2px; }

/* hero */
.hero { position: relative; min-height: 92vh; display: grid; align-items: end; overflow: hidden; }
#grains-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero-inner {
  position: relative; z-index: 2; padding: 0 clamp(1rem, 4vw, 3rem) clamp(2rem, 6vh, 4rem);
  max-width: 780px;
}
.hero h1 {
  font-family: var(--disp); font-weight: 800; letter-spacing: -0.035em;
  font-size: clamp(2.6rem, 7.5vw, 5.4rem); line-height: 0.98; margin: 0 0 1.1rem;
  text-wrap: balance;
}
.hero h1 .accent { color: var(--blue); }
.hero p.sub { font-size: clamp(1rem, 1.6vw, 1.2rem); color: var(--mut); max-width: 34rem; margin: 0 0 1.6rem; }
.cta-row { display: flex; gap: .9rem; flex-wrap: wrap; }
.btn {
  display: inline-block; font-family: var(--disp); font-weight: 700; font-size: 1rem;
  padding: .8rem 1.5rem; border-radius: 2px; border: 1px solid transparent;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); text-decoration: none; }
.btn-ghost { border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--blue); text-decoration: none; }

/* sections */
section { padding: clamp(3rem, 9vh, 6rem) clamp(1rem, 4vw, 3rem); }
.wrap { max-width: 1060px; margin: 0 auto; }
.eyebrow { font: .72rem var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--blue); margin: 0 0 .8rem; }
h2 { font-family: var(--disp); font-weight: 800; letter-spacing: -0.025em;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem); line-height: 1.05; margin: 0 0 1rem; text-wrap: balance; }
.lead { color: var(--mut); max-width: 40rem; }

/* transcript */
.transcript {
  background: var(--card); border: 1px solid var(--line); border-radius: 3px;
  font: .85rem/1.65 var(--mono); padding: 1.4rem 1.6rem; overflow-x: auto;
  max-width: 720px;
}
.transcript .you { color: var(--blue); font-weight: 600; }
.transcript .claude { color: var(--mut); }
.transcript .out { color: var(--ink); }
.transcript .live { color: var(--ok); font-weight: 600; }

/* three rows */
.rows { display: grid; gap: 0; border-top: 1px solid var(--line); }
.row {
  display: grid; grid-template-columns: minmax(140px, 220px) 1fr;
  gap: 1.5rem; padding: 1.8rem 0; border-bottom: 1px solid var(--line);
}
.row h3 { font-family: var(--disp); font-weight: 700; font-size: 1.25rem; margin: 0; letter-spacing: -0.015em; }
.row p { margin: 0; color: var(--mut); max-width: 44rem; }
.row code { font-family: var(--mono); font-size: .85em; background: color-mix(in srgb, var(--blue) 9%, transparent); padding: .1em .35em; border-radius: 2px; color: var(--ink); }

/* receipt */
.receipt-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; align-items: start; }
@media (min-width: 880px) { .receipt-grid { grid-template-columns: 5fr 6fr; } }
.receipt {
  background: var(--card); border: 1px solid var(--line); border-radius: 3px;
  font: .74rem/1.6 var(--mono); padding: 1.3rem 1.4rem; overflow-x: auto; position: relative;
}
.receipt .k { color: var(--mut); }
.receipt .v { color: var(--ink); }
.receipt .sig { color: var(--blue); word-break: break-all; }
.stamp {
  position: absolute; top: 1rem; right: 1rem; font: .68rem var(--mono);
  border: 1.5px solid var(--ok); color: var(--ok); padding: .25rem .55rem;
  border-radius: 2px; letter-spacing: .08em; transform: rotate(3deg);
}

/* pricing */
.spec { border-top: 2px solid var(--ink); max-width: 760px; }
.spec-row { display: flex; justify-content: space-between; gap: 1.5rem;
  padding: 1rem 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.spec-row .label { font-weight: 600; }
.spec-row .val { font-family: var(--mono); font-size: .9rem; text-align: right;
  font-variant-numeric: tabular-nums; color: var(--mut); }
.spec-row .val b { color: var(--ink); font-weight: 700; }

/* footer */
footer { padding: 2.5rem clamp(1rem, 4vw, 3rem); border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  color: var(--mut); font-size: .9rem; }
footer nav { display: flex; gap: 1.4rem; }
footer a { color: var(--mut); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
@media (max-width: 640px) {
  .row { grid-template-columns: 1fr; gap: .4rem; }
}

/* closing brand band: the real wordmark asset on its own navy, both themes */
.brand-band { background: #020a22; display: grid; justify-items: center; }
.brand-band img { display: block; width: min(680px, 78vw); height: auto; }

/* single-asset brand lockup, theme-swapped */
.brand img.lockup { display: none; height: 32px; width: auto; }
.brand img.lockup-light { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand img.lockup-light { display: none; }
  :root:not([data-theme="light"]) .brand img.lockup-dark { display: block; }
}
:root[data-theme="dark"] .brand img.lockup-light { display: none; }
:root[data-theme="dark"] .brand img.lockup-dark { display: block; }