/* PhantomSDR-Plus website — one stylesheet for every page.
   Look follows the receiver's own "metal panel" style: dark navy panels,
   cyan accents, one light source from the upper right. */

:root {
  --bg: #070d18;
  --bg-2: #0c1626;
  --panel: #15202f;
  --panel-2: #1b2839;
  --panel-edge: #2a3a50;
  --text: #dbe6f3;
  --muted: #8ea3bb;
  --accent: #2ad4e6;
  --accent-2: #4f8cff;
  --yellow: #f6c945;
  --green: #3ee07a;
  --red: #ff5a5a;
  --radius: 12px;
  --maxw: 1180px;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --shadow: -6px 8px 22px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 85% -10%, rgba(42, 212, 230, .10), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(79, 140, 255, .08), transparent 60%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: var(--mono); font-size: .9em; }
code { background: rgba(42, 212, 230, .08); border: 1px solid rgba(42, 212, 230, .18); padding: .05em .35em; border-radius: 5px; color: #bff4fa; }
pre { background: #050a12; border: 1px solid var(--panel-edge); border-radius: 10px; padding: 16px 18px; overflow-x: auto; line-height: 1.5; color: #c9e9ef; }
pre code { background: none; border: 0; padding: 0; color: inherit; }
h1, h2, h3 { line-height: 1.2; letter-spacing: .01em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); font-weight: 750; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.accent { color: var(--accent); }
.yellow { color: var(--yellow); }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 13, 24, .82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(42, 58, 80, .7);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; font-size: 1.15rem; letter-spacing: .02em; }
.brand:hover { text-decoration: none; }
.brand svg { width: 34px; height: 34px; flex: none; }
.brand b { color: var(--accent); }
.nav-links { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-links a { display: block; padding: 8px 12px; border-radius: 8px; color: var(--muted); font-weight: 600; font-size: .95rem; }
.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, .05); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--accent); background: rgba(42, 212, 230, .09); }
.nav-toggle { display: none; background: none; border: 1px solid var(--panel-edge); color: var(--text); border-radius: 8px; padding: 6px 10px; font-size: 1.1rem; cursor: pointer; }

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; padding: 8px 16px 16px;
    background: rgba(7, 13, 24, .97); border-bottom: 1px solid var(--panel-edge);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 10px; font-weight: 700;
  border: 1px solid var(--panel-edge);
  background: linear-gradient(225deg, #2a3a50, #172231);
  color: var(--text);
  box-shadow: inset -1px 1px 0 rgba(255, 255, 255, .12), var(--shadow);
  transition: transform .12s ease, border-color .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); border-color: var(--accent); }
.btn.primary { background: linear-gradient(225deg, #39e4f3, #1596b8); color: #031018; border-color: #4ee9f7; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- hero ---------- */
.hero { position: relative; padding: 72px 0 56px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.eyebrow { display: inline-block; font-family: var(--mono); font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); border: 1px solid rgba(42, 212, 230, .35); padding: 4px 10px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 1.2rem; color: #b8c8da; max-width: 36em; }
.hero-visual { position: relative; }
@media (max-width: 920px) {
  .hero { padding-top: 44px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- metal panel (the receiver's own look) ---------- */
.panel {
  position: relative;
  background: linear-gradient(225deg, var(--panel-2) 0%, var(--panel) 55%, #111a27 100%);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: inset -1px 1px 0 rgba(255, 255, 255, .08), inset 1px -1px 0 rgba(0, 0, 0, .4), var(--shadow);
  padding: 24px;
}
.panel.screws::before, .panel.screws::after,
.panel.screws > .screw-b::before, .panel.screws > .screw-b::after {
  content: ""; position: absolute; width: 9px; height: 9px; border-radius: 50%;
  background: radial-gradient(circle at 65% 35%, #c9d3df, #5a6676 60%, #2a323d);
  box-shadow: -1px 1px 2px rgba(0, 0, 0, .6);
}
.panel.screws::before { top: 9px; left: 9px; }
.panel.screws::after { top: 9px; right: 9px; }
.panel.screws > .screw-b::before { bottom: 9px; left: 9px; }
.panel.screws > .screw-b::after { bottom: 9px; right: 9px; }

/* ---------- the receiver display mock in the hero ---------- */
.radio { padding: 18px; }
.radio canvas { width: 100%; height: 230px; display: block; border-radius: 8px; background: #000816; }
.radio-readout { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 14px; flex-wrap: wrap; }
.freq { font-family: var(--mono); font-size: clamp(1.6rem, 4vw, 2.2rem); color: #e6f6ff; background: #030812; border: 1px solid #22344a; border-radius: 8px; padding: 4px 14px; letter-spacing: .04em; text-shadow: 0 0 10px rgba(42, 212, 230, .45); }
.freq .dim { color: #43566b; text-shadow: none; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { font-family: var(--mono); font-size: .78rem; padding: 4px 9px; border-radius: 6px; border: 1px solid var(--panel-edge); color: var(--muted); background: #0f1824; }
.chip.on { color: #031018; background: var(--accent); border-color: var(--accent); font-weight: 700; }
.chip.y { color: var(--yellow); border-color: rgba(246, 201, 69, .45); }

/* ---------- sections ---------- */
section { padding: 64px 0; }
section.alt { background: linear-gradient(180deg, rgba(12, 22, 38, .0), rgba(12, 22, 38, .75) 15%, rgba(12, 22, 38, .75) 85%, rgba(12, 22, 38, 0)); }
.section-head { max-width: 760px; margin-bottom: 36px; }
.section-head p { color: var(--muted); font-size: 1.08rem; }
.kicker { font-family: var(--mono); color: var(--accent); font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 8px; display: block; }

.grid { display: grid; gap: 20px; }
.grid.c2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.c4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 980px) { .grid.c4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .grid.c3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .grid.c2, .grid.c3, .grid.c4 { grid-template-columns: 1fr; } }

.card h3 { display: flex; align-items: center; gap: 10px; }
.card p { color: #b3c3d6; margin-bottom: 0; }
.card p + p { margin-top: .7em; }
.card ul { margin: .6em 0 0; padding-left: 1.1em; color: #b3c3d6; }
.card li { margin: .25em 0; }
.ico { width: 38px; height: 38px; flex: none; border-radius: 10px; display: grid; place-items: center; font-size: 1.15rem; background: rgba(42, 212, 230, .1); border: 1px solid rgba(42, 212, 230, .28); }
.ico.t { font-family: var(--mono); font-size: .78rem; font-weight: 800; color: var(--accent); letter-spacing: -.02em; }
.tag { display: inline-block; font-family: var(--mono); font-size: .72rem; padding: 2px 8px; border-radius: 999px; border: 1px solid rgba(246, 201, 69, .45); color: var(--yellow); margin-left: auto; white-space: nowrap; }

/* stats strip */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 40px; }
.stat { text-align: left; padding: 18px 20px; }
.stat b { display: block; font-family: var(--mono); font-size: 1.7rem; color: var(--accent); line-height: 1.1; }
.stat span { color: var(--muted); font-size: .92rem; }
@media (max-width: 820px) { .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* decoder tiles */
.decoders { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.dec { padding: 14px 16px; border-radius: 10px; background: #0e1724; border: 1px solid var(--panel-edge); }
.dec b { display: block; font-family: var(--mono); color: var(--accent); font-size: 1.05rem; }
.dec span { color: var(--muted); font-size: .86rem; }

/* screenshots */
.shots { display: grid; grid-template-columns: 1.5fr 1fr; gap: 20px; align-items: start; }
.shot { margin: 0; padding: 10px; }
.shot img { border-radius: 8px; cursor: zoom-in; }
.shot figcaption { color: var(--muted); font-size: .9rem; padding: 10px 4px 2px; }
@media (max-width: 820px) { .shots { grid-template-columns: 1fr; } }

/* lightbox */
.lightbox { position: fixed; inset: 0; background: rgba(0, 0, 0, .88); display: none; align-items: center; justify-content: center; z-index: 100; padding: 16px; cursor: zoom-out; }
.lightbox.open { display: flex; }
.lightbox img { max-height: 92vh; max-width: 96vw; border-radius: 8px; }

/* split row: text + panel */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.split.rev > :first-child { order: 2; }
@media (max-width: 880px) { .split { grid-template-columns: 1fr; } .split.rev > :first-child { order: 0; } }

.checks { list-style: none; padding: 0; margin: 0; }
.checks li { position: relative; padding-left: 28px; margin: .55em 0; color: #c2d0e0; }
.checks li::before { content: ""; position: absolute; left: 4px; top: .55em; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px rgba(42, 212, 230, .7); }

/* tables */
.table-wrap { overflow-x: auto; border-radius: 10px; border: 1px solid var(--panel-edge); }
table { width: 100%; border-collapse: collapse; font-size: .96rem; }
th, td { padding: 11px 14px; text-align: left; border-bottom: 1px solid #1f2c3e; vertical-align: top; }
th { background: #111b29; color: var(--accent); font-weight: 700; font-size: .85rem; letter-spacing: .05em; text-transform: uppercase; }
tr:last-child td { border-bottom: 0; }
td:first-child { font-weight: 600; white-space: nowrap; }

/* page title band (sub-pages) */
.page-hero { padding-top: 56px; padding-bottom: 24px; }
.page-hero .lead { margin-top: 8px; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.toc a { font-size: .9rem; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--panel-edge); color: var(--muted); background: #0e1724; }
.toc a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* callout */
.callout { border-left: 3px solid var(--yellow); background: rgba(246, 201, 69, .06); padding: 14px 18px; border-radius: 0 10px 10px 0; color: #e4dcc0; }
.callout.info { border-left-color: var(--accent); background: rgba(42, 212, 230, .06); color: #cde9ee; }

/* CTA band */
.cta { text-align: center; padding: 48px 24px; }
.cta p { color: var(--muted); max-width: 640px; margin: 0 auto 22px; }
.cta .btn-row { justify-content: center; }

/* footer */
.site-footer { border-top: 1px solid var(--panel-edge); padding: 36px 0 44px; margin-top: 40px; color: var(--muted); font-size: .92rem; background: rgba(5, 9, 16, .6); }
.foot { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.foot ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 18px; flex-wrap: wrap; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--accent); }
.signoff { font-family: var(--mono); color: var(--accent); }

/* scroll-in reveal: a gentle lift only, content is never hidden */
.js .reveal { transform: translateY(10px); transition: transform .5s ease; }
.js .reveal.in { transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { transform: none; transition: none; }
}

/* whole-card links */
a.card, a.dec { display: block; color: var(--text); transition: border-color .12s ease, transform .12s ease; }
a.card:hover, a.dec:hover { text-decoration: none; border-color: var(--accent); transform: translateY(-2px); }
a.card h3 { color: var(--text); }
td code { white-space: nowrap; }
.h1-name { display: block; font-size: .36em; font-weight: 700; color: var(--muted); letter-spacing: .02em; margin-bottom: .45em; }