:root {
  --bg0: #070b14;
  --bg1: #0d1524;
  --ink: #e6eef8;
  --ink-dim: #8494ab;
  --line: rgba(120, 170, 230, 0.16);
  --accent: #3d8dff;
  --accent-2: #6ec8ff;
  --danger: #ff6b5a;
  --paper: #3d8dff;
  --amp: #6ec8ff;
  --live: #ffb020;
  --display: "Rubik", system-ui, sans-serif;
  --sans: "Inter Tight", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --bar-h: 3.4rem;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg0);
}

.eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.brand {
  margin: 0.15rem 0 0;
  font-family: var(--display);
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  line-height: 0.92;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.brand-compact {
  margin: 0;
  font-family: var(--display);
  font-size: 1.55rem;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--ink);
}
.lead {
  margin: 0.75rem 0 0;
  max-width: 28rem;
  color: var(--ink-dim);
  font-size: 1.05rem;
  line-height: 1.45;
}

/* --- Login --- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 55% at 15% 10%, rgba(61, 141, 255, 0.28), transparent 55%),
    radial-gradient(ellipse 60% 50% at 90% 80%, rgba(110, 200, 255, 0.14), transparent 50%),
    linear-gradient(165deg, #070b14 0%, #0d1524 45%, #060912 100%);
}
.grid-lines {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 75%);
  opacity: 0.45;
}
.login-stage {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  padding-bottom: max(1.25rem, env(safe-area-inset-bottom));
}
.login-panel {
  width: min(100%, 26rem);
  animation: rise 0.7s ease both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.field {
  display: grid;
  gap: 0.4rem;
  margin: 1.75rem 0 1rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.field input {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(6, 12, 22, 0.72);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  padding: 0.85rem 1rem;
  outline: none;
  border-radius: 0;
}
.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 141, 255, 0.2);
}
.btn {
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  padding: 0.9rem 1.25rem;
  background: var(--accent);
  color: #061018;
  width: 100%;
}
.btn:hover { background: var(--accent-2); }
.btn.ghost {
  background: transparent;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  padding: 0.45rem 0.8rem;
  font-size: 0.82rem;
  flex-shrink: 0;
  width: auto;
}
.btn.ghost:hover { color: var(--ink); border-color: var(--accent); }
.err {
  min-height: 1.25rem;
  margin: 0.75rem 0 0;
  color: var(--danger);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .login-panel .brand { font-size: 2.35rem; }
  .lead { font-size: 0.92rem; }
  .btn { padding: 0.8rem 1rem; font-size: 0.9rem; }
}

/* --- Tab shell --- */
body.shell {
  display: grid;
  grid-template-rows: var(--bar-h) 1fr;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: #070b14;
}
.shell-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem 1rem;
  min-height: var(--bar-h);
  padding: 0 0.85rem 0 1rem;
  padding-left: max(0.85rem, env(safe-area-inset-left));
  padding-right: max(0.85rem, env(safe-area-inset-right));
  border-bottom: 1px solid rgba(120, 170, 230, 0.14);
  background: linear-gradient(180deg, #121a2a 0%, #0a101c 100%);
  z-index: 5;
}
.shell-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}
.view-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  overflow: hidden;
}
.view-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-dim);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.55rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.view-btn + .view-btn {
  border-left: 1px solid var(--line);
}
.view-btn.active {
  background: rgba(61, 141, 255, 0.22);
  color: var(--ink);
}
.shell-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1rem;
  min-width: 7.5rem;
}
.tabs {
  display: flex;
  align-items: stretch;
  gap: 0.25rem;
  overflow-x: auto;
  min-width: 0;
  height: 100%;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-dim);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  padding: 0 1rem;
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.tab:hover { color: var(--ink); background: rgba(255, 255, 255, 0.03); }
.tab.active {
  color: var(--ink);
  border-bottom-color: var(--tone, var(--accent));
}
.tab.tone-paper { --tone: var(--paper); }
.tab.tone-amp { --tone: var(--amp); }
.tab.tone-live { --tone: var(--live); }
.shell-main {
  position: relative;
  min-height: 0;
  background: #070b14;
}
.frame-panel {
  position: absolute;
  inset: 0;
}
.frame-panel[hidden] { display: none !important; }
.bot-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #070b14;
}
.frame-panel.mode-desktop {
  overflow: hidden;
}
.frame-panel.mode-desktop .bot-frame {
  width: var(--desk-width, 1180px);
  height: calc(100% / var(--desk-scale, 1));
  transform: scale(var(--desk-scale, 1));
  transform-origin: 0 0;
}

@media (max-width: 720px) {
  :root { --bar-h: auto; }
  body.shell {
    grid-template-rows: auto 1fr;
  }
  .shell-bar {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    padding: 0.4rem 0.55rem 0;
    padding-left: max(0.55rem, env(safe-area-inset-left));
    padding-right: max(0.55rem, env(safe-area-inset-right));
    gap: 0.2rem 0.45rem;
  }
  .shell-brand { grid-column: 1; min-width: 0; }
  .shell-brand .eyebrow { display: none; }
  .brand-compact { font-size: 1.15rem; }
  .shell-actions {
    grid-column: 2;
    grid-row: 1;
    align-self: center;
  }
  #logout {
    padding: 0.35rem 0.5rem;
    font-size: 0.68rem;
  }
  .view-btn {
    font-size: 0.65rem;
    padding: 0.32rem 0.42rem;
  }
  .tabs {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(120, 170, 230, 0.12);
    height: 2.35rem;
    gap: 0;
  }
  .tab {
    flex: 1 1 0;
    font-size: 0.78rem;
    padding: 0 0.35rem;
    text-align: center;
  }
}