:root {
  --bg: #05080f;
  --bg-soft: #0a1524;
  --panel: #0f1f33;
  --ink: #e8f7ff;
  --muted: #7aa8bc;
  --accent: #00d4ff;
  --accent2: #33e0ff;
  --accent-deep: #0090c4;
  --line: rgba(0, 212, 255, 0.22);
  --glow: rgba(0, 212, 255, 0.32);
  --font-display: "Sora", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-body: "Sora", "Segoe UI", "Helvetica Neue", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(900px 480px at 12% -8%, rgba(0, 212, 255, 0.18), transparent 58%),
    radial-gradient(700px 420px at 92% 8%, rgba(51, 224, 255, 0.1), transparent 52%),
    radial-gradient(640px 360px at 50% 110%, rgba(0, 144, 196, 0.1), transparent 55%),
    linear-gradient(180deg, #05080f 0%, var(--bg) 45%, #0a1830 100%);
}
a { color: var(--accent2); }
a:hover { color: var(--accent); }
.wrap { width: min(1040px, calc(100% - 2rem)); margin: 0 auto; }
.hero {
  min-height: 100vh;
  display: grid;
  align-content: center;
  gap: 1rem;
  padding: 3rem 0 4rem;
}
.brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 4.8rem);
  font-weight: 700;
  letter-spacing: -.03em;
  margin: 0;
  line-height: .95;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: .7rem;
}
.brand img {
  width: clamp(2.6rem, 8vw, 4.2rem);
  height: clamp(2.6rem, 8vw, 4.2rem);
  border-radius: 1rem;
  box-shadow: 0 0 0 1px var(--line), 0 0 24px var(--glow);
}
.brand .vpn { color: var(--accent); }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 38rem; margin: 0; line-height: 1.55; }
.cta {
  display: inline-flex; gap: .75rem; flex-wrap: wrap; margin-top: .5rem;
}
.btn {
  display: inline-block; text-decoration: none; color: #041018;
  background: linear-gradient(180deg, var(--accent2), var(--accent-deep));
  padding: .85rem 1.2rem; border-radius: .7rem; font-weight: 700;
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.2), 0 10px 28px rgba(0, 212, 255, 0.22);
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.4), 0 14px 32px rgba(0, 212, 255, 0.32);
  color: #041018;
}
.btn.ghost {
  background: transparent; color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: none;
}
.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--accent2);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.18);
}
section {
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--line);
}
h1, h2 {
  font-family: var(--font-display);
  letter-spacing: -.02em;
  margin: 0 0 .75rem;
}
h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 {
  font-size: clamp(1.45rem, 3.5vw, 2rem);
  display: flex;
  align-items: center;
  gap: .65rem;
}
h2 .os-emoji {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
  flex-shrink: 0;
  filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.35));
}
.foot { color: var(--muted); padding: 2rem 0 3rem; font-size: .92rem; }

/* Instruction page */
.page-instruction .instr-top {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; padding: 1.25rem 0 0;
}
.brand-mark {
  font-family: var(--font-display);
  font-size: 1.55rem; font-weight: 700; color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}
.brand-mark img {
  width: 1.7rem;
  height: 1.7rem;
  border-radius: .45rem;
  box-shadow: 0 0 0 1px var(--line), 0 0 12px rgba(0, 212, 255, 0.25);
}
.brand-mark .vpn { color: var(--accent); }
.instr-nav {
  display: flex; flex-wrap: wrap; gap: .55rem .85rem;
}
.instr-nav a {
  color: var(--muted); text-decoration: none; font-size: .92rem;
  border-bottom: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}
.instr-nav a img {
  width: 1.15rem;
  height: 1.15rem;
  object-fit: contain;
}
.instr-nav a:hover { color: var(--accent2); border-bottom-color: var(--accent); }
.instr-hero {
  border-top: none;
  padding-top: 2rem;
  display: grid;
  gap: 1.25rem;
}
.platform-block { padding: 2.25rem 0; }
.dl-row { display: flex; flex-wrap: wrap; gap: .65rem; margin: 0; }
@media (max-width: 640px) {
  .hero { min-height: 88vh; padding-top: 2rem; }
  .instr-nav { width: 100%; }
}

.back-one {
  color: var(--muted);
  text-decoration: none;
  font-size: .95rem;
}
.back-one:hover { color: var(--accent2); }
.page-instruction .instr-nav {
  display: flex; flex-wrap: wrap; gap: .65rem 1rem;
  padding: .5rem 0 1.5rem;
}
.page-instruction .platform-block {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--line);
}
.page-instruction .platform-block ol {
  color: var(--muted);
  line-height: 1.55;
  padding-left: 1.2rem;
}
.page-instruction .instr-hero { padding: 1.5rem 0 0; border: 0; }