:root {
  --bg: #0b0f14;
  --fg: #e8eef5;
  --muted: #8b9aab;
  --accent: #3d9cf0;
  --accent-2: #1a6fb5;
  --card: #121820;
  --border: #243041;
  --danger: #e85d5d;
  --ok: #5dcea0;
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(61, 156, 240, 0.18), transparent 60%),
    radial-gradient(700px 400px at 0% 20%, rgba(26, 111, 181, 0.12), transparent 55%),
    linear-gradient(180deg, #0e141c 0%, var(--bg) 40%);
  color: var(--fg);
  min-height: 100vh;
}
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(11, 15, 20, 0.75);
  z-index: 20;
}
.brand {
  color: var(--fg);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
nav a { color: var(--muted); margin-left: 1rem; text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--fg); }
main { max-width: 820px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }
main.main-wide, .hero-full, .section, .site-footer, .admin-wrap {
  max-width: 1080px;
  margin-left: auto;
  margin-right: auto;
}
.hero-full {
  position: relative;
  padding: 4.5rem 1.25rem 3.5rem;
  overflow: hidden;
  animation: fadeUp 0.7s ease both;
}
.hero-inner { position: relative; z-index: 1; max-width: 720px; }
.brand-mark {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 4.5rem);
  font-weight: 700;
  margin: 0 0 0.75rem;
  letter-spacing: -0.04em;
  line-height: 1;
}
.hero-full h1 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 500;
  margin: 0 0 0.85rem;
  line-height: 1.25;
  color: var(--fg);
}
.hero-lead { color: var(--muted); font-size: 1.05rem; max-width: 36rem; margin: 0 0 1.5rem; }
.hero-glow {
  position: absolute;
  inset: auto -10% -40% 40%;
  height: 420px;
  background: radial-gradient(circle, rgba(61,156,240,0.22), transparent 65%);
  animation: pulseGlow 6s ease-in-out infinite;
  pointer-events: none;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.7rem 1.15rem;
  border-radius: 8px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 500;
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); background: var(--accent-2); }
.btn-primary { background: var(--accent); }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
}
.btn-ghost:hover { background: var(--card); }
.btn-danger { background: var(--danger); }
.btn-sm { padding: 0.35rem 0.65rem; font-size: 0.85rem; }
.section { padding: 3rem 1.25rem; animation: fadeUp 0.6s ease both; }
.section-alt {
  background: rgba(18, 24, 32, 0.55);
  border-block: 1px solid var(--border);
}
.section h2, .cta-final h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.section-lead { color: var(--muted); margin: 0 0 1.5rem; max-width: 36rem; }
.section-lead-wide { max-width: 42rem; }
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem 2rem;
}
.pillar-grid h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 0.4rem;
  letter-spacing: -0.02em;
}
.pillar-grid p { margin: 0; color: var(--muted); font-size: 0.95rem; line-height: 1.45; }
.plain-list {
  margin: 0;
  padding-left: 1.15rem;
  display: grid;
  gap: 0.55rem;
  color: var(--muted);
  max-width: 40rem;
}
.plain-list li { line-height: 1.45; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}
.feature-grid article {
  padding: 0.25rem 0;
  animation: fadeUp 0.7s ease both;
}
.feature-grid h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 0.4rem;
}
.feature-grid p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.steps {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.75rem;
  color: var(--muted);
}
.steps strong { color: var(--fg); }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}
.price-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  background: var(--card);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.price-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.price-card h3 { font-family: var(--font-display); margin: 0 0 0.5rem; }
.price { font-size: 1.6rem; font-weight: 600; margin: 0 0 0.35rem; }
.cta-final { text-align: left; padding-bottom: 4rem; }
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer nav a { margin-left: 1rem; }
.muted { color: var(--muted); }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { text-align: left; padding: 0.65rem 0.4rem; border-bottom: 1px solid var(--border); }
form { display: grid; gap: 0.75rem; max-width: 420px; }
.admin-form { max-width: 560px; }
input, select, textarea {
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  font-family: var(--font-body);
  width: 100%;
}
label { display: grid; gap: 0.35rem; font-size: 0.92rem; }
.msg { padding: 0.75rem; border-radius: 8px; background: var(--card); border: 1px solid var(--border); }
.error { color: #ff8a8a; }
.ok { color: var(--ok); }
.qr { word-break: break-all; }
.admin-wrap { padding: 1rem 1.25rem 3rem; }
.admin-nav { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1rem 0 1.5rem; }
.admin-nav a {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  margin-left: 0;
}
.admin-nav a:hover { color: var(--fg); border-color: var(--accent); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.85rem;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  display: grid;
  gap: 0.25rem;
}
.stat-n { font-family: var(--font-display); font-size: 1.35rem; font-weight: 600; }
.stat-l { color: var(--muted); font-size: 0.85rem; }
.admin-search { display: flex; gap: 0.5rem; max-width: 480px; margin-bottom: 1rem; }
.admin-search input { flex: 1; }
.table-scroll { overflow-x: auto; }
.plan-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  background: var(--card);
  margin-bottom: 1rem;
  max-width: 640px;
}
.plan-card h2 { font-family: var(--font-display); margin-top: 0; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulseGlow {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}
.ask-page { display: grid; gap: 1rem; min-height: calc(100vh - 8rem); }
.ask-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}
.ask-header h1 {
  font-family: var(--font-display);
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}
.ask-header .muted { margin: 0; }
.ask-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.ask-toolbar { max-width: 280px; }
.ask-model { max-width: 280px; }
.ask-messages {
  flex: 1;
  min-height: 320px;
  max-height: min(58vh, 640px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(18, 24, 32, 0.55);
  padding: 1rem;
  display: grid;
  gap: 0.85rem;
  align-content: start;
}
.ask-empty { margin: 0; }
.ask-msg { display: grid; gap: 0.25rem; }
.ask-msg-role {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.ask-msg-body {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.45;
}
.ask-msg-user .ask-msg-body {
  color: var(--fg);
}
.ask-msg-assistant .ask-msg-body {
  color: #d5e6f7;
}
.ask-msg-streaming::after {
  content: "▋";
  animation: askBlink 1s step-end infinite;
  margin-left: 2px;
  color: var(--accent);
}
@keyframes askBlink {
  50% { opacity: 0; }
}
.ask-composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  align-items: end;
  max-width: none;
}
.ask-composer textarea { resize: vertical; min-height: 4.5rem; }
.download-page h1 {
  font-family: var(--font-display);
  font-size: 1.85rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}
.download-page h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.02em;
}
.download-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  background: var(--card);
  max-width: 32rem;
  display: grid;
  gap: 0.75rem;
}
.download-version { margin: 0; }
.download-notes { margin: 0; color: var(--muted); line-height: 1.45; }
.download-hint { margin: 0; font-size: 0.9rem; }
@media (max-width: 640px) {
  .top { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  nav a { margin-left: 0; margin-right: 0.85rem; }
  .site-footer { flex-direction: column; gap: 0.75rem; align-items: flex-start; }
  .ask-composer { grid-template-columns: 1fr; }
}