/* RFscape — site pages (home, references, privacy, 404). Same palette as the tool's header: deep navy, one cyan accent.
 * Shape rule: buttons are pills; cards, images and the form are 14 px; inputs 10 px. No web fonts (system stack).
 * MIT license. */
:root {
  --bg: #07151d;
  --bg-2: #0b1f2a;
  --bg-3: #10293a;
  --line: rgba(156, 201, 214, .16);
  --ink: #e6f1f4;
  --muted: #9cb4bd;
  --accent: #67e8f9;
  --accent-ink: #04212b;
  --accent-hover: #a5f3fc;
  --warn: #fca5a5;
  --ok: #86efac;
  --r-card: 14px;
  --r-input: 10px;
  --wrap: 1180px;
  color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 600px at 85% -10%, rgba(103, 232, 249, .09), transparent 60%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; display: block; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2rem); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 1rem; top: 1rem; z-index: 50; background: var(--bg-2); padding: .5rem .8rem; }

/* ---------- header ---------- */
.top { position: sticky; top: 0; z-index: 20; background: rgba(7, 21, 29, .82); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
@supports not (backdrop-filter: blur(1px)) { .top { background: var(--bg); } }
.top .wrap { height: 64px; display: flex; align-items: center; gap: 1.4rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.15rem; letter-spacing: .01em; }
.brand b { color: var(--accent); font-weight: 700; }
.brand img { width: 30px; height: 30px; }
.nav { display: flex; align-items: center; gap: 1.2rem; margin-left: auto; }
.nav a { color: var(--muted); text-decoration: none; font-size: .93rem; white-space: nowrap; }
.nav a:hover { color: var(--ink); }
.nav .who { color: var(--ink); font-size: .9rem; white-space: nowrap; }
.nav button.link { all: unset; cursor: pointer; color: var(--muted); font-size: .93rem; }
.nav button.link:hover { color: var(--ink); }
#i18n-slot { display: flex; }
@media (max-width: 860px) { .nav .opt { display: none; } }
@media (max-width: 520px) { .nav .btn { display: none; } .top .wrap { gap: .8rem; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .72rem 1.3rem; border-radius: 999px; border: 1px solid transparent;
  font: inherit; font-weight: 600; font-size: .97rem; text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: background-color .2s cubic-bezier(.16, 1, .3, 1), border-color .2s, transform .2s cubic-bezier(.16, 1, .3, 1), color .2s;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: var(--accent-hover); color: var(--accent-ink); transform: translateY(-1px); }
.btn.ghost { border-color: rgba(103, 232, 249, .45); color: var(--ink); background: transparent; }
.btn.ghost:hover { border-color: var(--accent); color: var(--ink); transform: translateY(-1px); }
.btn:active { transform: translateY(1px) scale(.985); }
.btn.small { padding: .45rem .95rem; font-size: .88rem; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }

/* ---------- hero ---------- */
.hero { padding: clamp(2.2rem, 6vw, 4.5rem) 0 clamp(2.5rem, 6vw, 4rem); }
.hero .wrap { display: grid; grid-template-columns: 6fr 7fr; gap: clamp(1.8rem, 4vw, 3.5rem); align-items: center; }
.hero h1 { margin: 0; font-size: clamp(2.1rem, 3.9vw, 3.15rem); line-height: 1.06; letter-spacing: -.025em; font-weight: 750; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { margin: 1.3rem 0 0; font-size: clamp(1.05rem, 1.5vw, 1.2rem); color: var(--muted); max-width: 40ch; }
.hero .ctas { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: .8rem; }
.shot { position: relative; margin: 0; border-radius: var(--r-card); overflow: hidden; border: 1px solid var(--line);
  box-shadow: 0 30px 80px -30px rgba(103, 232, 249, .25), 0 12px 30px -12px rgba(0, 0, 0, .6); background: var(--bg-2); }
.shot img { width: 100%; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; } .hero p.lead { max-width: 46ch; } }

/* ---------- sections ---------- */
section.block { padding: clamp(3rem, 8vw, 6rem) 0; border-top: 1px solid var(--line); }
section.block h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.4rem); line-height: 1.15; letter-spacing: -.02em; font-weight: 720; max-width: 22ch; }
section.block .intro { margin: 1rem 0 0; color: var(--muted); max-width: 62ch; font-size: 1.06rem; }
.eyebrow { display: block; margin-bottom: .9rem; font-size: .78rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); font-weight: 650; }

/* three modes: asymmetric bento, three cells */
.modes { margin-top: 2.6rem; display: grid; grid-template-columns: 7fr 5fr; grid-template-rows: auto auto; gap: 1.1rem; }
.cell { border: 1px solid var(--line); border-radius: var(--r-card); background: var(--bg-2); overflow: hidden; display: flex; flex-direction: column; }
.cell .txt { padding: 1.4rem 1.5rem 1.5rem; }
.cell h3 { margin: 0 0 .45rem; font-size: 1.2rem; letter-spacing: -.01em; }
.cell p { margin: 0; color: var(--muted); }
.cell.net { grid-row: span 2; }
.cell.net img { flex: 1; object-fit: cover; object-position: center 40%; min-height: 0; }
.cell.link img { background: #fff; }
.cell.rep { background: linear-gradient(160deg, var(--bg-3), var(--bg-2) 70%); }
.scale { display: flex; height: 12px; border-radius: 999px; overflow: hidden; margin: 1.1rem 0 .4rem; }
.scale i { flex: 1; }
.scale-l { display: flex; justify-content: space-between; font-size: .78rem; color: var(--muted); font-variant-numeric: tabular-nums; }
@media (max-width: 860px) { .modes { grid-template-columns: 1fr; } .cell.net { grid-row: auto; } }

/* science: two columns of facts, sparse dividers */
.facts { margin-top: 2.4rem; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: clamp(2rem, 5vw, 4.5rem); }
.fact { padding: 1.3rem 0; border-top: 1px solid var(--line); }
.fact h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.fact p { margin: 0; color: var(--muted); }
.more { margin-top: 2rem; }
@media (max-width: 760px) { .facts { grid-template-columns: 1fr; } }

.numbers { margin-top: 2.6rem; display: flex; flex-wrap: wrap; gap: 2.2rem 3.2rem; }
.numbers div { min-width: 10rem; }
.numbers b { display: block; font-size: clamp(1.7rem, 3vw, 2.2rem); letter-spacing: -.02em; font-variant-numeric: tabular-nums; color: var(--ink); }
.numbers span { color: var(--muted); font-size: .92rem; }

/* ---------- account ---------- */
.account .wrap { display: grid; grid-template-columns: 5fr 6fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.account ul { margin: 1.4rem 0 0; padding: 0; list-style: none; color: var(--muted); }
.account li { padding: .35rem 0 .35rem 1.6rem; position: relative; }
.account li::before { content: ""; position: absolute; left: 0; top: .82rem; width: .8rem; height: 2px; background: var(--accent); }
.form { border: 1px solid var(--line); border-radius: var(--r-card); background: var(--bg-2); padding: clamp(1.3rem, 3vw, 2rem); }
.form h3 { margin: 0 0 1.2rem; font-size: 1.25rem; }
.field { display: grid; gap: .4rem; margin-bottom: 1rem; }
.field label { font-size: .9rem; font-weight: 600; }
.field input[type=email], .field input[type=text], .field input[type=password] {
  width: 100%; padding: .72rem .85rem; border-radius: var(--r-input); border: 1px solid rgba(156, 201, 214, .32);
  background: #061219; color: var(--ink); font: inherit; font-size: 1rem;
}
.field input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(103, 232, 249, .2); }
.field input[aria-invalid=true] { border-color: var(--warn); }
.field .hint { font-size: .82rem; color: var(--muted); }
.pw { position: relative; }
.pw input { padding-right: 4.8rem; }
.pw button { all: unset; position: absolute; right: .75rem; top: .72rem; cursor: pointer; color: var(--accent); font-size: .85rem; font-weight: 600; }
.check { display: flex; gap: .6rem; align-items: flex-start; margin: .4rem 0 1.1rem; font-size: .92rem; color: var(--muted); }
.check input { margin-top: .3rem; width: 1.05rem; height: 1.05rem; accent-color: var(--accent); flex: none; }
.ts { min-height: 65px; margin-bottom: 1rem; }
.msg { min-height: 1.4rem; margin: .8rem 0 0; font-size: .93rem; }
.msg.err { color: var(--warn); }
.msg.ok { color: var(--ok); }
.switch { margin-top: 1.1rem; font-size: .92rem; color: var(--muted); }
.switch button { all: unset; cursor: pointer; color: var(--accent); font-weight: 600; }
.switch button:hover { color: var(--accent-hover); }
.done { text-align: left; }
.done p { color: var(--muted); }
[hidden] { display: none !important; }
@media (max-width: 860px) { .account .wrap { grid-template-columns: 1fr; } }

/* ---------- text pages (references, privacy) ---------- */
.page { padding: clamp(2.2rem, 6vw, 4rem) 0 clamp(3rem, 8vw, 5rem); }
.page h1 { margin: 0; font-size: clamp(2rem, 4vw, 2.8rem); letter-spacing: -.02em; line-height: 1.12; }
.page .lead { color: var(--muted); max-width: 70ch; font-size: 1.08rem; }
.page h2 { margin: 2.8rem 0 .4rem; font-size: 1.45rem; letter-spacing: -.01em; }
.page h3 { margin: 1.9rem 0 .6rem; font-size: 1.08rem; color: var(--accent); }
.page p, .page li { max-width: 78ch; }
.refs { margin: 0; padding-left: 1.3rem; }
.refs li { margin: .7rem 0; color: var(--ink); }
.refs .use { display: block; color: var(--muted); font-size: .92rem; margin-top: .15rem; }
.page .note { color: var(--muted); font-size: .95rem; }

/* ---------- footer ---------- */
footer.foot { border-top: 1px solid var(--line); padding: 2.2rem 0 2.6rem; color: var(--muted); font-size: .9rem; }
footer.foot .wrap { display: grid; gap: .8rem; }
footer.foot nav { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; }
footer.foot nav a { color: var(--ink); text-decoration: none; }
footer.foot nav a:hover { color: var(--accent); }
footer.foot p { margin: 0; max-width: 95ch; }

/* ---------- entrance (only with motion allowed) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .rise { opacity: 0; transform: translateY(16px); animation: rise .8s cubic-bezier(.16, 1, .3, 1) forwards; animation-delay: calc(var(--i, 0) * 90ms + 60ms); }
  @keyframes rise { to { opacity: 1; transform: none; } }
  .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.16, 1, .3, 1), transform .7s cubic-bezier(.16, 1, .3, 1); }
  .reveal.in { opacity: 1; transform: none; }
}