/* FutureLab App Matrix — apps.nexlab.top
   Self-contained stylesheet: no external CSS, no web fonts, no JS. */

:root {
  --bg: #0f1117;
  --surface: #171a23;
  --surface-2: #1e222d;
  --text: #e8eaef;
  --muted: #9aa3b2;
  --accent: #5b8cff;
  --accent-soft: rgba(91, 140, 255, 0.12);
  --border: rgba(255, 255, 255, 0.09);
  --max: 1080px;
  --radius: 16px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: radial-gradient(1100px 560px at 8% -12%, #1b2444 0%, var(--bg) 58%);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 22px; }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 17, 23, 0.86);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}
.brand:hover { text-decoration: none; }

.brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 20px;
  margin-left: auto;
  font-size: 15px;
}
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: transform 0.12s ease, background 0.12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #0d1220;
}
.btn-primary:hover { background: #7ba1ff; }

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.24); }

.btn-sm { padding: 8px 16px; font-size: 14px; }

/* anchor targets must clear the sticky header */
.section[id], main[id] { scroll-margin-top: 78px; }

/* ------------------------------------------------------------------ hero */
.hero { padding: 76px 22px 56px; }

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.03em;
  max-width: 20em;
}

.h1-sub { display: block; }

.lead {
  margin: 0 0 28px;
  font-size: 18px;
  color: var(--muted);
  max-width: 44em;
}

.lead-en {
  display: block;
  margin-top: 8px;
  font-size: 15px;
  color: rgba(154, 163, 178, 0.85);
  font-style: italic;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.hero-note {
  margin: 26px 0 0;
  font-size: 13.5px;
  color: var(--muted);
}

/* --------------------------------------------------------------- section */
.section { padding: 46px 22px 26px; }
.section + .section { padding-top: 26px; }

.section-head { margin-bottom: 26px; }

.section h2 {
  margin: 0 0 6px;
  font-size: clamp(23px, 3.4vw, 31px);
  letter-spacing: -0.02em;
}

.section-sub {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.section-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13.5px;
}

/* ----------------------------------------------------------------- cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.card-cat {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.card-title { margin: 0 0 4px; font-size: 22px; letter-spacing: -0.02em; }

.card-store { margin: 0 0 12px; font-size: 13px; color: var(--muted); }

.card-tagline { margin: 0 0 4px; font-size: 16px; font-weight: 500; }

.card-tagline-en {
  margin: 0 0 14px;
  font-size: 13.5px;
  color: var(--muted);
  font-style: italic;
}

.card-points {
  margin: 0 0 16px;
  padding-left: 18px;
  font-size: 14.5px;
  color: #c8ccd6;
}
.card-points li { margin-bottom: 9px; }
.card-points li:last-child { margin-bottom: 0; }

.store-note {
  margin: 0 0 16px;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid rgba(91, 140, 255, 0.22);
  font-size: 13px;
  color: #b9c6e8;
}

.card-meta {
  margin: auto 0 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.card-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

.site-link {
  font-size: 13.5px;
  color: var(--muted);
  border-bottom: 1px dotted var(--muted);
}
.site-link:hover { color: var(--text); text-decoration: none; }

/* -------------------------------------------------------------- flagship */
.flagship-box {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.14), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.flagship-box > div:first-child { flex: 1 1 460px; }

.flagship-name { margin: 0 0 10px; font-size: 24px; font-weight: 700; letter-spacing: -0.02em; }

.flagship-line { margin: 0 0 8px; font-size: 15px; color: #c8ccd6; }
.flagship-line:last-child { margin-bottom: 0; }

.flagship-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* ----------------------------------------------------------------- steps */
.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.steps li {
  counter-increment: step;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.steps li::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid rgba(91, 140, 255, 0.3);
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 12px;
}

.steps h3 { margin: 0 0 8px; font-size: 17px; letter-spacing: -0.01em; }
.steps p { margin: 0; font-size: 14.5px; color: #c8ccd6; }

/* ---------------------------------------------------------------- values */
.values {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.value {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.value h3 { margin: 0 0 8px; font-size: 17px; letter-spacing: -0.01em; }
.value p { margin: 0; font-size: 14.5px; color: #c8ccd6; }

/* ------------------------------------------------------------------- faq */
.faq { display: grid; gap: 12px; }

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0 20px;
}

.faq-item summary {
  cursor: pointer;
  padding: 16px 0;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  color: var(--accent);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item summary:hover { color: var(--accent); }

.faq-item p {
  margin: 0 0 18px;
  padding-top: 2px;
  font-size: 15px;
  color: #c8ccd6;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ---------------------------------------------------------------- footer */
.site-footer {
  margin-top: 60px;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.25);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: space-between;
  align-items: center;
  padding-top: 30px;
  padding-bottom: 18px;
}

.footer-brand { margin: 0 0 4px; font-weight: 700; letter-spacing: -0.02em; }
.footer-note { margin: 0; font-size: 13.5px; color: var(--muted); }

.footer-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 14px; }

.footer-copy {
  padding-top: 0;
  padding-bottom: 26px;
}
.footer-copy p { margin: 0; font-size: 13px; color: var(--muted); }

/* ------------------------------------------------------------ responsive */
@media (max-width: 720px) {
  .steps,
  .values { grid-template-columns: minmax(0, 1fr); }
  .nav { flex-wrap: wrap; gap: 10px; }
  .nav-links { order: 3; width: 100%; margin-left: 0; gap: 16px; }
  .nav .btn { margin-left: auto; }
  .hero { padding-top: 52px; }
  .flagship-box { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}