/* Cerberus site — shared design system.
   Dark brand to match the App Store slides. Every page links this file;
   page-specific <style> blocks should stay tiny. */

:root {
  color-scheme: dark;
  --bg: #0b0e14;
  --bg-2: #10151f;
  --panel: #151b27;
  --panel-2: #1b2331;
  --line: rgba(255, 255, 255, 0.09);
  --line-2: rgba(255, 255, 255, 0.16);
  --fg: #f2f4f8;
  --fg-2: #c9cfda;
  --muted: #8b94a5;
  --blue: #3d8bff;
  --blue-soft: rgba(61, 139, 255, 0.14);
  --orange: #ff9f2e;
  --orange-soft: rgba(255, 159, 46, 0.14);
  --green: #34c759;
  --green-soft: rgba(52, 199, 89, 0.14);
  --red: #ff5a52;
  --red-soft: rgba(255, 90, 82, 0.14);
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --font: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 0.5em; letter-spacing: 0.01em; }
p { margin: 0 0 1em; }
strong { color: var(--fg); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.accent { color: var(--blue); }
.accent-orange { color: var(--orange); }
.accent-green { color: var(--green); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--panel); padding: 8px 12px; border-radius: 8px; }

/* ---------- top navigation ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 14, 20, 0.82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 24px; height: 60px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 700; font-size: 17px; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  color: var(--fg-2); font-size: 15px; padding: 6px 12px; border-radius: 999px; white-space: nowrap;
}
.nav-links a:hover { color: var(--fg); background: var(--panel); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--fg); background: var(--panel-2); }
@media (max-width: 720px) {
  .topbar-inner { gap: 12px; padding: 0 14px; }
  .brand span { display: none; }
  .nav-links a { font-size: 14px; padding: 6px 10px; }
}

/* ---------- hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 88px 0 72px; text-align: center;
  background:
    radial-gradient(900px 480px at 80% -10%, rgba(61, 139, 255, 0.22), transparent 70%),
    radial-gradient(700px 420px at 0% 110%, rgba(255, 159, 46, 0.10), transparent 70%);
}
.hero .app-icon { width: 112px; height: 112px; border-radius: 26px; margin: 0 auto 26px; box-shadow: var(--shadow); }
.eyebrow { display: inline-block; font-size: 14px; font-weight: 600; letter-spacing: 0.08em; color: var(--blue); background: var(--blue-soft); padding: 4px 12px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(34px, 5.6vw, 60px); font-weight: 800; margin-bottom: 18px; }
.hero h1 .hl { background: linear-gradient(90deg, #6fb0ff, #3d8bff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { font-size: clamp(17px, 2.2vw, 21px); color: var(--fg-2); max-width: 720px; margin: 0 auto 30px; }
.hero .fineprint { margin-top: 18px; font-size: 14px; color: var(--muted); }

/* ---------- App Store badges ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; align-items: center; }
.badges.left { justify-content: flex-start; }
.badge-link { display: inline-flex; flex-direction: column; align-items: center; gap: 8px; }
.badge-link:hover { text-decoration: none; opacity: 0.88; }
.badge-link img { height: 52px; width: auto; }
.badge-link .badge-caption { font-size: 13px; color: var(--muted); }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: 16px; padding: 11px 20px; border-radius: 999px; border: 1px solid transparent; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: #5a9cff; }
.btn-ghost { color: var(--fg); border-color: var(--line-2); }
.btn-ghost:hover { background: var(--panel); }

/* ---------- sections ---------- */
.section { padding: 84px 0; }
.section.alt { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 40px); font-weight: 800; }
.section-head p { color: var(--fg-2); font-size: 18px; margin: 0; }

/* ---------- grids & cards ---------- */
.grid-2, .grid-3 { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 26px 22px;
}
.card h3 { font-size: 20px; margin-bottom: 8px; }
.card p { color: var(--fg-2); font-size: 16px; margin-bottom: 0; }
.card .icon { font-size: 30px; line-height: 1; margin-bottom: 14px; display: block; }
a.card { display: block; color: inherit; transition: border-color .15s, transform .15s; }
a.card:hover { text-decoration: none; border-color: var(--line-2); transform: translateY(-2px); }
a.card .more { display: inline-block; margin-top: 14px; color: var(--blue); font-weight: 600; font-size: 15px; }

/* two big platform cards on the home page */
.platform-card { display: flex; flex-direction: column; gap: 14px; padding: 30px; }
.platform-card .platform-shot { border-radius: 14px; border: 1px solid var(--line); margin-top: 6px; }
.platform-card .meta { color: var(--muted); font-size: 14px; }

/* ---------- feature rows (text + image) ---------- */
.feature { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; padding: 40px 0; }
.feature.reverse { grid-template-columns: 1fr 1.05fr; }
.feature.reverse .feature-text { order: 2; }
.feature h3 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; }
.feature p, .feature li { color: var(--fg-2); }
.feature ul { padding-left: 1.2em; margin: 0; }
@media (max-width: 860px) {
  .feature, .feature.reverse { grid-template-columns: 1fr; gap: 24px; }
  .feature.reverse .feature-text { order: 0; }
}

/* ---------- screenshots ---------- */
.shot { margin: 0; }
.shot img { border-radius: 16px; border: 1px solid var(--line); box-shadow: var(--shadow); background: #000; }
.shot figcaption { font-size: 14px; color: var(--muted); margin-top: 10px; text-align: center; }
.shot.phone { max-width: 340px; margin-left: auto; margin-right: auto; }
.shot.phone img { border-radius: 28px; }
.shot.tablet { max-width: 560px; margin-left: auto; margin-right: auto; }
.shot.desktop img { border-radius: 12px; }
.prose .shot { margin: 28px auto; }

.gallery {
  display: grid; grid-auto-flow: column; gap: 18px; overflow-x: auto;
  scroll-snap-type: x mandatory; padding: 6px 2px 18px; scrollbar-width: thin;
}
.gallery > * { scroll-snap-align: start; }
.gallery.phones { grid-auto-columns: minmax(220px, 260px); }
.gallery.tablets { grid-auto-columns: minmax(300px, 380px); }
.gallery.desktops { grid-auto-columns: minmax(420px, 640px); }
.gallery img { border-radius: 14px; border: 1px solid var(--line); }
.gallery.phones img { border-radius: 22px; }

/* ---------- numbered steps ---------- */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; gap: 18px; }
.steps > li {
  counter-increment: step; position: relative;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 20px 22px 18px 74px;
}
.steps > li::before {
  content: counter(step); position: absolute; left: 22px; top: 20px;
  width: 34px; height: 34px; border-radius: 50%; background: var(--blue); color: #fff;
  font-weight: 700; display: grid; place-items: center; font-size: 16px; line-height: 1;
}
.steps > li h3, .steps > li h4 { font-size: 18px; margin: 4px 0 6px; }
.steps > li p:last-child { margin-bottom: 0; }
.steps > li p { color: var(--fg-2); }
.steps.horizontal { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 860px) { .steps.horizontal { grid-template-columns: 1fr; } }

/* ---------- callouts ---------- */
.callout {
  border-radius: var(--radius-sm); padding: 16px 20px 16px 20px; margin: 22px 0;
  border: 1px solid var(--line); background: var(--panel); border-left: 4px solid var(--blue);
}
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout .callout-title { font-weight: 700; display: block; margin-bottom: 4px; }
.callout.tip { border-left-color: var(--green); background: linear-gradient(90deg, var(--green-soft), transparent 60%), var(--panel); }
.callout.note { border-left-color: var(--blue); background: linear-gradient(90deg, var(--blue-soft), transparent 60%), var(--panel); }
.callout.warn { border-left-color: var(--orange); background: linear-gradient(90deg, var(--orange-soft), transparent 60%), var(--panel); }
.callout.danger { border-left-color: var(--red); background: linear-gradient(90deg, var(--red-soft), transparent 60%), var(--panel); }

/* ---------- inline UI label / platform chips ---------- */
.ui {
  display: inline-block; font-size: 0.9em; font-weight: 600; color: var(--fg);
  background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 7px;
  padding: 0 7px; line-height: 1.6;
  /* long on-screen strings must be able to wrap on a phone; clone keeps the
     pill shape on every line */
  overflow-wrap: anywhere; -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; }
.chip { font-size: 13px; font-weight: 600; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--fg-2); }
.chip.mac { color: #c9d6ff; border-color: rgba(120, 150, 255, 0.4); }
.chip.ios { color: #b9ecc7; border-color: rgba(52, 199, 89, 0.4); }
code, kbd { font-family: var(--mono); font-size: 0.88em; background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }

/* ---------- article / guide layout ---------- */
.page-head { padding: 56px 0 28px; border-bottom: 1px solid var(--line); margin-bottom: 36px;
  background: radial-gradient(700px 300px at 85% -40%, rgba(61, 139, 255, 0.18), transparent 70%); }
.breadcrumb { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--fg); }
.page-head h1 { font-size: clamp(30px, 4.4vw, 44px); font-weight: 800; margin-bottom: 12px; }
.page-head .lead { font-size: 19px; color: var(--fg-2); margin: 0; }

.prose h2 { font-size: 27px; font-weight: 800; margin: 52px 0 16px; padding-top: 8px; scroll-margin-top: 80px; }
.prose h3 { font-size: 20px; margin: 32px 0 10px; scroll-margin-top: 80px; }
.prose p, .prose li { color: var(--fg-2); }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.1em; }
.prose li { margin-bottom: 6px; }
.prose li::marker { color: var(--muted); }
.prose table { width: 100%; border-collapse: collapse; margin: 18px 0 26px; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { color: var(--fg); font-weight: 700; background: var(--panel); }
.prose td { color: var(--fg-2); }
.table-wrap { overflow-x: auto; }

.toc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px 20px; margin: 0 0 30px; }
.toc strong { display: block; font-size: 14px; color: var(--muted); margin-bottom: 6px; font-weight: 600; }
.toc ol { margin: 0; padding-left: 1.2em; }
.toc li { margin: 2px 0; font-size: 15px; }

.guide-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 56px 0 24px; }
.guide-nav a { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 18px; color: var(--fg); }
.guide-nav a:hover { border-color: var(--line-2); text-decoration: none; }
.guide-nav small { display: block; color: var(--muted); font-size: 13px; }
.guide-nav .next { text-align: right; grid-column: 2; }
@media (max-width: 640px) { .guide-nav { grid-template-columns: 1fr; } .guide-nav .next { grid-column: 1; } }

/* ---------- FAQ ---------- */
details.faq { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 12px; }
details.faq summary { cursor: pointer; padding: 16px 20px; font-weight: 600; list-style: none; position: relative; padding-right: 44px; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; position: absolute; right: 20px; top: 13px; font-size: 22px; color: var(--muted); }
details.faq[open] summary::after { content: "–"; }
details.faq > div { padding: 0 20px 16px; color: var(--fg-2); }
details.faq > div p:last-child { margin-bottom: 0; }

/* ---------- spec table / price ---------- */
.spec { display: grid; grid-template-columns: 160px 1fr; gap: 0; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.spec > div { padding: 12px 16px; border-bottom: 1px solid var(--line); }
.spec > div:nth-child(odd) { background: var(--panel); color: var(--muted); font-size: 15px; }
.spec > div:nth-child(even) { color: var(--fg-2); }
.spec > div:nth-last-child(-n+2) { border-bottom: 0; }
@media (max-width: 560px) { .spec { grid-template-columns: 1fr; } .spec > div:nth-child(odd) { border-bottom: 0; padding-bottom: 2px; } }

/* ---------- CTA band ---------- */
.cta { text-align: center; padding: 72px 0; background: radial-gradient(600px 300px at 50% 0%, rgba(61, 139, 255, 0.18), transparent 70%); }
.cta h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; }
.cta p { color: var(--fg-2); margin-bottom: 26px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0 56px; color: var(--muted); font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; margin-bottom: 30px; }
.footer-grid h4 { color: var(--fg); font-size: 14px; margin-bottom: 10px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin: 6px 0; }
.footer-grid a { color: var(--muted); }
.footer-grid a:hover { color: var(--fg); }
.legal { border-top: 1px solid var(--line); padding-top: 20px; line-height: 1.7; font-size: 13px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- contact form (support.html) ---------- */
.contact-form { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; margin: 8px 0 18px; display: grid; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.field { display: grid; gap: 6px; }
.field label { font-weight: 600; font-size: 15px; color: var(--fg); }
.field .req { color: var(--orange); margin-left: 2px; }
.field .hint { font-size: 13px; color: var(--muted); }
.field input, .field select, .field textarea {
  font: inherit; font-size: 16px; color: var(--fg); background: var(--bg-2);
  border: 1px solid var(--line-2); border-radius: 10px; padding: 10px 12px; width: 100%;
}
.field textarea { min-height: 170px; resize: vertical; line-height: 1.6; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--blue); outline-offset: 1px; border-color: transparent; }
.field [aria-invalid="true"] { border-color: var(--red); }
.field-error { font-size: 14px; color: #ff8a84; min-height: 0; }
.field-error:empty { display: none; }
.field-foot { display: flex; justify-content: space-between; gap: 12px; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form-actions button { font: inherit; font-weight: 600; font-size: 16px; padding: 11px 22px; border-radius: 999px; border: 0; background: var(--blue); color: #fff; cursor: pointer; }
.form-actions button:disabled { opacity: 0.55; cursor: default; }
.form-status { font-size: 15px; color: var(--fg-2); }
.form-status.error { color: #ff8a84; }
.form-note { font-size: 14px; color: var(--muted); margin: 0; }
.contact-done { outline: none; }

/* grid/flex children must be allowed to shrink below their longest word
   (file names like 2026-07-18_07-21-53-front.mp4) */
.steps > li, .card, .feature-text, .callout { min-width: 0; overflow-wrap: anywhere; }
code { overflow-wrap: anywhere; }