:root {
  --bg: #0b0b16;
  --bg-2: #121226;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-border: rgba(255, 255, 255, 0.1);
  --text: #f2f0ff;
  --muted: #a6a3c8;
  --violet: #7c3aed;
  --blue: #3881f6;
  --radius: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 700px at 15% -10%, rgba(124, 58, 237, 0.35), transparent 60%),
    radial-gradient(1000px 600px at 100% 0%, rgba(56, 129, 246, 0.28), transparent 55%),
    var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, "Segoe UI", Roboto, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* -------------------------------------------------------------- topbar */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  padding-top: max(16px, env(safe-area-inset-top));
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.2px;
}
.brand img { border-radius: 7px; display: block; }

/* --------------------------------------------------------------- hero */

.hero {
  flex: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 6vh 22px 40px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(38px, 8vw, 68px);
  line-height: 1.05;
  margin: 0 0 14px;
  font-weight: 800;
  background: linear-gradient(90deg, #fff, #c9bcff 60%, #9ec3ff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  color: var(--muted);
  font-size: clamp(15px, 2.4vw, 19px);
  margin: 0 auto 34px;
  max-width: 520px;
}

/* ------------------------------------------------------------- omnibar */

.omnibar {
  display: flex;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 8px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
}

#go-input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  outline: none;
  color: var(--text);
  font-size: 17px;
  padding: 12px 14px;
}
#go-input::placeholder { color: #7f7ca6; }

.go-btn {
  flex: 0 0 auto;
  border: 0;
  border-radius: 11px;
  padding: 12px 22px;
  font-size: 16px;
  font-weight: 650;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(135deg, var(--violet), var(--blue));
  transition: transform 0.08s ease, filter 0.15s ease;
}
.go-btn:hover { filter: brightness(1.08); }
.go-btn:active { transform: scale(0.97); }

/* --------------------------------------------------------- motor-status */

.engine {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 14px auto 0;
  padding: 7px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: var(--panel);
  font-size: 13px;
  color: var(--muted);
}
.engine-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: 0 0 auto;
  background: var(--amber, #e0a44a);
}
.engine-dot[data-state='loading'] { background: #e0a44a; animation: pulse 1.1s ease-in-out infinite; }
.engine-dot[data-state='ready'] { background: #46c98b; box-shadow: 0 0 7px rgba(70, 201, 139, 0.7); }
.engine-dot[data-state='error'] { background: #e5646d; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ----------------------------------------------------------- shortcuts */

.shortcuts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 18px 0 0;
}
.shortcuts button {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--muted);
  border-radius: 999px;
  padding: 7px 15px;
  font-size: 14px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.shortcuts button:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.08);
}

/* -------------------------------------------------------- install-card */

.install-card {
  display: flex;
  align-items: center;
  gap: 20px;
  text-align: left;
  margin: 46px 0 0;
  padding: 22px 24px;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.16), rgba(56, 129, 246, 0.12));
  border: 1px solid var(--panel-border);
  border-radius: 20px;
}
.install-text h2 { margin: 0 0 6px; font-size: 20px; }
.install-text p { margin: 0; color: var(--muted); font-size: 14.5px; }

.install-btn {
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border-radius: 11px;
  padding: 9px 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, transform 0.08s;
}
.install-btn:hover { background: rgba(255, 255, 255, 0.14); }
.install-btn:active { transform: scale(0.97); }

.install-btn.big {
  flex: 0 0 auto;
  padding: 14px 22px;
  font-size: 16px;
  background: linear-gradient(135deg, var(--violet), var(--blue));
  border: 0;
}

/* ---------------------------------------------------------------- help */

.help {
  margin: 26px auto 0;
  max-width: 560px;
  text-align: left;
  color: var(--muted);
  font-size: 14px;
}
.help summary {
  cursor: pointer;
  color: #cbb8ff;
  text-align: center;
  list-style: none;
}
.help summary::-webkit-details-marker { display: none; }
.help ul { margin: 10px 0 0; padding-left: 20px; }
.help li { margin: 6px 0; }
.help b { color: var(--text); }
.help em { color: #cbb8ff; font-style: normal; }

/* ---------------------------------------------------------------- foot */

.foot {
  text-align: center;
  color: #6b6890;
  font-size: 13px;
  padding: 22px;
  padding-bottom: max(22px, env(safe-area-inset-bottom));
}
.foot .dot { margin: 0 8px; opacity: 0.5; }

@media (max-width: 560px) {
  .install-card { flex-direction: column; align-items: stretch; text-align: center; }
  .install-btn.big { width: 100%; }
}