:root {
  --bg: #070a17;
  --panel: #131833;
  --border: #262d57;
  --text: #e8eaf6;
  --muted: #8f95b8;
  --link: #67e8f9;
  --accent: linear-gradient(90deg, #22d3ee, #6366f1, #ec4899);
  --radius: 14px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img { max-width: 100%; height: auto; }

a { color: var(--link); text-underline-offset: 2px; }
a:hover { color: #a5f3fc; }

:focus-visible {
  outline: 3px solid #22d3ee;
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  background: var(--panel);
  color: var(--text);
  padding: .6rem 1rem;
  border: 2px solid #22d3ee;
  border-radius: 8px;
  z-index: 100;
}
.skip-link:focus { top: 1rem; }

.wrap {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(19, 24, 51, .6);
  position: relative;
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--accent);
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem 1.5rem;
  padding-top: .85rem;
  padding-bottom: .85rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
}
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
}
.site-nav a {
  display: block;
  padding: .4rem .7rem;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); background: var(--panel); }
.site-nav a[aria-current="page"] {
  color: var(--text);
  background: var(--panel);
  box-shadow: inset 0 0 0 1px var(--border);
}

/* Main */
main { flex: 1; padding: 2.5rem 0 3rem; }
main:focus { outline: none; }

h1, h2, h3 { line-height: 1.25; }
h1 { font-size: clamp(1.75rem, 5vw, 2.5rem); margin: 0 0 .5rem; }
h2 { font-size: 1.35rem; margin: 2rem 0 .6rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 .4rem; }

.prose { max-width: 760px; margin: 0 auto; }
.prose p, .prose li { color: var(--text); }
.prose ul { padding-left: 1.25rem; }
.prose li { margin: .3rem 0; }
.meta { color: var(--muted); margin: 0 0 1.5rem; }

.gradient-text {
  background: var(--accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Hero */
.hero { text-align: center; padding: 1rem 0 2rem; }
.hero img {
  width: 140px; height: 140px;
  border-radius: 28px;
  box-shadow: 0 10px 40px rgba(99, 102, 241, .35);
}
.hero h1 { font-size: clamp(2.2rem, 8vw, 3.5rem); margin-top: 1rem; }
.tagline { color: var(--muted); font-size: 1.2rem; margin: 0 auto; max-width: 560px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
}

.notice {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem 1.25rem 1.6rem;
  margin: 1.5rem 0;
  overflow: hidden;
}
.notice::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, #22d3ee, #6366f1, #ec4899);
}
.notice h2 { margin-top: 0; }
.notice p:last-child { margin-bottom: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}
.grid li { margin: 0; }
.grid h3 { margin-top: 0; }
.grid p { margin: 0; color: var(--muted); }

.devices { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.devices li {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .35rem .9rem;
}

.link-list { padding-left: 1.25rem; }

.faq dt { font-weight: 700; margin-top: 1.25rem; }
.faq dd { margin: .3rem 0 0; color: var(--text); }

.center { text-align: center; }

.btn {
  display: inline-block;
  padding: .65rem 1.2rem;
  border-radius: 10px;
  background: var(--accent);
  color: #070a17;
  font-weight: 700;
  text-decoration: none;
}
.btn:hover { color: #070a17; filter: brightness(1.1); }

/* Placeholder highlighting: search for class="todo" */
.todo {
  background: #fde047;
  color: #111;
  padding: 0 .3em;
  border-radius: 4px;
  font-weight: 700;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .95rem;
  padding: 1.5rem 0 2rem;
}
.site-footer p { margin: 0 0 .6rem; }
.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .25rem 1rem;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }

@media (max-width: 480px) {
  main { padding-top: 1.5rem; }
  .header-inner { justify-content: center; }
  .site-nav ul { justify-content: center; }
  .site-nav a { padding: .35rem .5rem; }
  .panel, .notice { padding: 1rem 1.1rem; }
}
.small { font-size: .9rem; opacity: .85; }
.activate-form { display: grid; gap: .9rem; max-width: 26rem; padding: 1.2rem 1.3rem; }
.activate-form label { display: grid; gap: .35rem; font-weight: 600; }
.activate-form input { padding: .65rem .8rem; border-radius: 10px; border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.06); color: inherit; font: 600 1.05rem ui-monospace, Consolas, monospace; letter-spacing: .04em; }
.activate-form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.activate-form p { margin: 0; }
.btn:disabled { opacity: .5; cursor: not-allowed; filter: none; }