/* packgen site — same "parts sheet" language as the app: paper, ink, hairlines, IBM Plex. */
:root {
  --paper: #f1f0eb;
  --sheet: #fafaf7;
  --inset: #e7e6df;
  --rule: #d3d1c7;
  --ink: #1b1a17;
  --muted: #6b685e;
  --mark: #f4cc3a;
  --mark-ink: #1b1a17;
  --ok: #2d6a39;
  --err: #b02a1e;
  --font: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #131311; --sheet: #1a1a17; --inset: #24231f; --rule: #36352f; --ink: #e9e7df; --muted: #9b988c;
    --mark: #e3b931; --mark-ink: #16150f; --ok: #7cc489; --err: #f07a6c; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #131311; --sheet: #1a1a17; --inset: #24231f; --rule: #36352f; --ink: #e9e7df; --muted: #9b988c;
  --mark: #e3b931; --mark-ink: #16150f; --ok: #7cc489; --err: #f07a6c; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.55 var(--font); -webkit-font-smoothing: antialiased; }
.mono { font-family: var(--mono); }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
[hidden] { display: none !important; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* top */
.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  height: 52px; padding: 0 24px; background: var(--sheet); border-bottom: 1px solid var(--ink); }
.brand { display: flex; align-items: baseline; gap: 12px; text-decoration: none; }
.brand-name { font: 600 16px var(--mono); }
.brand-sub { color: var(--muted); font-size: 13px; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--ink); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 40px; padding: 0 16px; border-radius: 2px;
  border: 1px solid var(--ink); background: var(--sheet); color: var(--ink); font: 500 15px var(--font); cursor: pointer; text-decoration: none; white-space: nowrap; }
.btn:hover { background: var(--inset); }
.btn.primary { background: var(--ink); color: var(--sheet); }
.btn.primary:hover { background: color-mix(in srgb, var(--ink) 85%, var(--sheet)); }
.btn.small { height: 32px; padding: 0 12px; font-size: 13px; }
.btn[disabled] { opacity: 0.5; pointer-events: none; }

/* hero */
.hero { padding-top: 72px; padding-bottom: 56px; }
.kicker { margin: 0 0 14px; font-size: 13px; color: var(--muted); }
.hero h1 { margin: 0; font-size: clamp(34px, 6vw, 60px); line-height: 1.05; font-weight: 600; letter-spacing: -0.02em; max-width: 16ch; }
/* rotating format word: all words are stacked; the current one slides in from below, the old one out the top */
.fmt { display: inline-block; position: relative; vertical-align: bottom; height: 1.12em; overflow: hidden;
  background: var(--mark); color: var(--mark-ink); padding: 0 0.14em; box-sizing: content-box;
  transition: width 0.35s cubic-bezier(0.2, 0.7, 0.2, 1); }
.fmt > span { position: absolute; left: 0.14em; top: 0.03em; white-space: nowrap; transform: translateY(110%);
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1); }
.fmt > span.on { transform: none; }
.fmt > span.off { transform: translateY(-110%); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
@media (prefers-reduced-motion: reduce) { .fmt, .fmt > span { transition: none; } }
.lead { margin: 22px 0 0; max-width: 62ch; font-size: 18px; color: color-mix(in srgb, var(--ink) 82%, var(--paper)); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }

/* sections */
section + section { margin-top: 72px; }
.section-head { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 24px; align-items: baseline;
  border-top: 1px solid var(--ink); padding-top: 12px; margin-bottom: 22px; }
.section-head h2 { margin: 0; font-size: 15px; font-weight: 600; }
.section-head p { margin: 0; color: var(--muted); max-width: 64ch; }

/* demo viewer */
.viewer-card { border: 1px solid var(--ink); background: var(--sheet); }
.viewer { position: relative; height: min(62vh, 560px); background: var(--inset); }
.viewer canvas { width: 100%; height: 100%; display: block; }
.viewer-status { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); font: 13px var(--mono); pointer-events: none; }
.viewer-dims { position: absolute; right: 12px; top: 12px; font-size: 12px; color: var(--muted); }
.evo { border-top: 1px solid var(--ink); padding: 10px 12px; display: grid; gap: 8px; }
.evo-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.evo-stages { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--ink); }
.evo-stages button { border: none; background: var(--sheet); color: var(--ink); font: 500 12px var(--mono); padding: 0 9px; height: 28px; cursor: pointer; }
.evo-stages button + button { border-left: 1px solid var(--rule); }
.evo-stages button:hover { background: var(--inset); }
.evo-stages button[aria-pressed="true"] { background: var(--mark); color: var(--mark-ink); }
.evo-caption { font-size: 14px; color: var(--muted); min-height: 1.5em; }
.evo-caption b { color: var(--ink); font-weight: 600; }

.sheet { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1px; background: var(--rule);
  border: 1px solid var(--rule); margin-top: 24px; }
.sheet figure { margin: 0; background: var(--sheet); }
.sheet img { display: block; width: 100%; aspect-ratio: 1; object-fit: cover; background: #b4bdc6; }
.sheet figcaption { font: 12px var(--mono); padding: 6px 8px; border-top: 1px solid var(--rule); color: var(--muted); }

/* steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--rule); }
.steps li { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 8px; padding: 16px 20px 16px 0; }
.steps li + li { padding-left: 20px; border-left: 1px solid var(--rule); }
.steps .n { color: var(--muted); font-size: 13px; padding-top: 3px; }
.steps h3 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
.steps p { margin: 0; color: var(--muted); font-size: 15px; }

/* spec */
.spec { display: grid; grid-template-columns: 200px minmax(0, 1fr); margin: 0; border-top: 1px solid var(--rule); }
.spec dt, .spec dd { padding: 10px 0; border-bottom: 1px solid var(--rule); }
.spec dt { font-weight: 600; font-size: 14px; }
.spec dd { margin: 0; color: color-mix(in srgb, var(--ink) 82%, var(--paper)); }

/* pricing */
.plan { border: 1px solid var(--ink); background: var(--sheet); padding: 22px 24px; max-width: 560px; display: grid; gap: 16px; }
.plan-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; border-bottom: 1px solid var(--ink); padding-bottom: 12px; }
.plan h3 { margin: 0; font-size: 18px; font-weight: 600; }
.plan-price { margin: 0; }
.price-amount { font-size: 28px; font-weight: 600; }
.price-interval { color: var(--muted); }
.plan-list { margin: 0; padding: 0; list-style: none; }
.plan-list li { padding: 7px 0 7px 22px; border-bottom: 1px solid var(--rule); position: relative; }
.plan-list li::before { content: "✓"; position: absolute; left: 0; font-family: var(--mono); color: var(--ok); }
.plan-note { margin: 0; font-size: 14px; color: var(--muted); }
.plan-lead { margin: 0; }
.price-later { color: var(--muted); font-size: 0.9em; margin-right: 4px; }
.tag { font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; background: var(--mark);
  color: var(--mark-ink); padding: 2px 6px; vertical-align: 3px; margin-left: 6px; }
.error { margin: 0; color: var(--err); font: 13px var(--mono); }

/* faq */
details { border-bottom: 1px solid var(--rule); }
details:first-of-type { border-top: 1px solid var(--rule); }
summary { cursor: pointer; padding: 12px 0; font-weight: 500; }
details p { margin: 0 0 14px; color: var(--muted); max-width: 70ch; }

.foot { display: flex; gap: 24px; flex-wrap: wrap; margin-top: 88px; padding-top: 16px; padding-bottom: 40px;
  border-top: 1px solid var(--ink); font-size: 13px; color: var(--muted); }
.foot a { color: var(--muted); }

/* thanks / manage pages */
.page { padding-top: 56px; max-width: 720px; }
.page h1 { margin: 0 0 8px; font-size: 32px; font-weight: 600; letter-spacing: -0.01em; }
.page .lead { margin-top: 8px; font-size: 16px; }
.key-box { display: flex; align-items: stretch; margin-top: 22px; border: 1px solid var(--ink); background: var(--sheet); }
.key-box code { flex: 1; min-width: 0; padding: 12px 14px; font: 500 15px var(--mono); overflow-wrap: anywhere; user-select: all; }
.key-box .btn { height: auto; border: none; border-left: 1px solid var(--ink); }
.todo { margin: 28px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--rule); counter-reset: step; }
.todo li { padding: 12px 0 12px 40px; border-bottom: 1px solid var(--rule); position: relative; counter-increment: step; }
.todo li::before { content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 13px; font: 13px var(--mono); color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.field { display: grid; gap: 6px; margin-top: 22px; font-size: 13px; font-weight: 600; color: var(--muted); }
.field input { height: 42px; border: 1px solid var(--ink); border-radius: 2px; background: var(--sheet); color: var(--ink); font: 15px var(--mono); padding: 0 12px; }

@media (max-width: 760px) {
  .wrap, .top { padding-left: 16px; padding-right: 16px; }
  .nav a { display: none; }
  .brand-sub { display: none; }
  .hero { padding-top: 44px; }
  .section-head, .spec { grid-template-columns: 1fr; gap: 4px; }
  .spec dt { border-bottom: none; padding-bottom: 0; }
  .steps { grid-template-columns: 1fr; }
  .steps li + li { padding-left: 0; border-left: none; border-top: 1px solid var(--rule); }
  .viewer { height: 58vh; }
}