:root {
  --bg: #f6f9fa; --surface: #ffffff; --band: #eaf3f5; --text: #102830; --muted: #56707a;
  --accent: #0a6c8c; --accent-dark: #08566f; --accent-soft: #cfe7f0; --border: #d3e0e4;
  --good: #1d7a4b; --bad: #b42318; --shadow: 0 1px 2px rgba(16, 40, 48, .06), 0 8px 24px rgba(16, 40, 48, .06);
  --radius: 12px; --wrap: 1080px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f171b; --surface: #16222a; --band: #13202a; --text: #e3edf0; --muted: #98aeb6;
    --accent: #4eb3d6; --accent-dark: #7cc8e3; --accent-soft: #1d3a48; --border: #24353f;
    --good: #56d364; --bad: #ff7b72; --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.6;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
code { font: .9em ui-monospace, "Cascadia Mono", Consolas, Menlo, monospace; background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); letter-spacing: -.02em; }
h2 { font-size: 1.7rem; letter-spacing: -.01em; }
h3 { font-size: 1.1rem; }

/* header */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); text-decoration: none; }
nav { display: flex; align-items: center; gap: 20px; }
nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
nav a:hover { color: var(--text); }

/* buttons */
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 12px 20px; border-radius: 10px;
  text-decoration: none; font-weight: 600; border: 1px solid var(--accent); transition: background .15s; }
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
@media (prefers-color-scheme: dark) { .btn { color: #07202a; } }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-soft); }
nav .btn.small { padding: 7px 14px; color: #fff; }
@media (prefers-color-scheme: dark) { nav .btn.small { color: #07202a; } }

/* hero */
.hero { padding: 72px 0 56px; background: radial-gradient(1000px 400px at 85% -10%, var(--accent-soft), transparent 70%); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; font-weight: 700; color: var(--accent); margin: 0 0 12px; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 36em; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 24px 0 12px; }
.meta { font-size: .9rem; color: var(--muted); }

.flow { margin: 0; display: grid; grid-template-columns: auto auto minmax(180px, 1fr) auto auto; grid-template-rows: auto auto;
  align-items: center; gap: 10px 12px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 24px; font-size: .9rem; }
.flow .file { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 12px 10px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg); text-align: center; min-width: 84px; }
.flow .file span { font-weight: 800; font-size: 1.05rem; color: var(--accent); }
.flow .xls { grid-column: 1; grid-row: 1; }
.flow .pdf { grid-column: 1; grid-row: 2; opacity: .85; }
.flow .arrow { font-size: 1.6rem; color: var(--muted); grid-row: 1 / span 2; }
.flow .a1 { grid-column: 2; }
.flow .a2 { grid-column: 4; }
.flow .app { grid-column: 3; grid-row: 1 / span 2; background: var(--accent-soft); border-radius: 10px; padding: 14px 16px; }
.flow .app ul { margin: 6px 0 0; padding-left: 18px; color: var(--muted); }
.flow .sd3 { grid-column: 5; grid-row: 1 / span 2; }

/* sections */
.section { padding: 64px 24px; }
.band { background: var(--band); padding: 64px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.steps { counter-reset: s; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.steps li { counter-increment: s; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; color: var(--muted); }
.steps li::before { content: counter(s); display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; margin-bottom: 10px; }
@media (prefers-color-scheme: dark) { .steps li::before { color: #07202a; } }
.steps strong { display: block; color: var(--text); margin-bottom: 4px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

/* downloads */
.downloads { display: grid; grid-template-columns: repeat(2, minmax(0, 320px)); gap: 16px; margin: 16px 0; }
.dl { display: flex; flex-direction: column; gap: 2px; padding: 20px; border-radius: var(--radius); background: var(--surface);
  border: 1px solid var(--border); text-decoration: none; color: var(--text); box-shadow: var(--shadow); transition: border-color .15s, transform .15s; }
.dl:hover { border-color: var(--accent); transform: translateY(-1px); }
.dl .os { font-size: 1.3rem; font-weight: 700; }
.dl .what { color: var(--accent); font-weight: 600; }
.dl .small { font-size: .85rem; color: var(--muted); }
.dl.missing { opacity: .5; pointer-events: none; }
.dl.missing .small::after { content: " · not uploaded yet"; }
.note { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin: 12px 0; max-width: 760px; }
.note summary { cursor: pointer; font-weight: 600; }
.note p { color: var(--muted); }
[data-notes] { white-space: pre-wrap; color: var(--muted); }
.files { padding-left: 18px; }
.files li { margin: 6px 0; }

/* privacy */
.two { display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; align-items: start; }
.checks { list-style: none; padding: 0; }
.checks li { position: relative; padding-left: 30px; margin: 10px 0; color: var(--muted); }
.checks li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--good); font-weight: 800; }
.aside { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
td { padding: 9px 4px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: 0; }
td.no { color: var(--good); font-weight: 700; text-align: right; }
td.yes { color: var(--muted); text-align: right; }

/* faq */
#faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px 18px; margin: 10px 0; }
#faq summary { cursor: pointer; font-weight: 600; }
#faq p { color: var(--muted); margin: 10px 0 0; }

.foot { padding: 32px 24px 48px; font-size: .9rem; }
.foot p { margin: 4px 0; }

@media (max-width: 900px) {
  .hero-grid, .two { grid-template-columns: 1fr; }
  .steps, .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  nav a:not(.btn) { display: none; }
  .steps, .cards, .downloads { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; grid-template-rows: none; }
  .flow > * { grid-column: auto !important; grid-row: auto !important; }
  .flow .arrow { transform: rotate(90deg); justify-self: center; }
  .hero { padding-top: 48px; }
}

/* plain lists and the facts table */
.facts { max-width: 560px; margin: 18px 0 4px; font-size: .95rem; }
.facts td { padding: 7px 4px; }
.facts td:first-child { color: var(--muted); width: 38%; white-space: nowrap; }
.plain { padding-left: 20px; margin: 0; max-width: 860px; }
.plain li { margin: 10px 0; color: var(--muted); }
.plain strong { color: var(--text); }