:root {
  --accent-hue: 150;
  --accent-chroma: 0.085;
  --bg: #16140f;
  --bg-soft: #1f1c16;
  --ink: #e8e2d2;
  --ink-dim: #9b9486;
  --ink-faint: #5f5a51;
  --accent: oklch(0.74 var(--accent-chroma) var(--accent-hue));
  --accent-soft: oklch(0.74 var(--accent-chroma) var(--accent-hue) / 0.16);
  --accent-glow: oklch(0.86 var(--accent-chroma) var(--accent-hue));
}

* { box-sizing: border-box; }
html, body, #root { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter Tight", "Inter", system-ui, sans-serif;
  font-feature-settings: "ss01", "cv11";
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.mono, .chip-meta, .msg-tag, .hud-label, .starter, .composer-prompt, .composer-send, .footmeta, .brand, .divider, .tweaks .mono {
  font-family: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

/* ————————————————————————————————————————
   Layout
———————————————————————————————————————— */

.shell {
  position: relative;
  height: 100%;
  width: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
  isolation: isolate;
}

.topbar {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 22px 32px;
  gap: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink);
}
.home-link {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.15s;
}
.home-link:hover { color: var(--accent); }
.brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink { 0%, 60%, 100% { opacity: 1; } 30% { opacity: 0.35; } }

.nav {
  display: flex; gap: 12px; align-items: center;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  justify-self: center;
}
.chip-meta { text-transform: uppercase; }
.divider { color: var(--ink-faint); }

.links {
  display: flex; gap: 18px;
  justify-self: end;
  font-size: 13px;
  letter-spacing: 0.02em;
}
.links a {
  color: var(--ink);
  text-decoration: none;
  position: relative;
  transition: color 0.2s;
}
.links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 1px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform 0.3s;
}
.links a:hover { color: var(--ink); }
.links a:hover::after { transform: scaleX(1); }

/* ————————————————————————————————————————
   Stage
———————————————————————————————————————— */

.stage {
  position: relative;
  display: grid;
  grid-template-columns: 1fr minmax(480px, 620px);
  align-items: center;
  gap: 24px;
  padding: 24px 48px;
  min-height: 0;
}

@media (max-width: 900px) {
  .stage {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(260px, 1fr) auto;
    padding: 16px;
  }
}

.halo-wrap {
  position: relative;
  height: 100%;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hud-label {
  /* inherits */
}
.halo-hud {
  position: absolute;
  bottom: 8px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 12px;
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--ink);
  padding: 6px 12px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
}

/* ————————————————————————————————————————
   Prompt + conversation
———————————————————————————————————————— */

.prompt-zone {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  height: 100%;
  max-height: 100%;
  padding: 16px 0;
}

.conversation {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-faint) transparent;
  padding-right: 8px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.conversation::-webkit-scrollbar { width: 4px; }
.conversation::-webkit-scrollbar-thumb { background: var(--ink-faint); }

.greeting {
  padding: 12px 0;
}
.greeting-kicker {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.greeting-name {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 300;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1;
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-dim) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.greeting-sub {
  font-size: 17px;
  color: var(--ink);
  opacity: 0.85;
  margin: 0;
  line-height: 1.55;
  max-width: 42ch;
}

.msg {
  display: flex;
  flex-direction: column;
  gap: 6px;
  animation: fadeUp 0.4s ease both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg-tag {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--ink-dim);
}
.msg-user .msg-tag { color: var(--accent); }

.msg-body {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  max-width: 58ch;
  text-wrap: pretty;
}
.msg-user .msg-body {
  color: var(--ink-dim);
}

.caret {
  display: inline-block;
  color: var(--accent);
  margin-left: 2px;
  animation: caret 0.9s steps(2) infinite;
}
@keyframes caret { 50% { opacity: 0; } }

.voice-toggle {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.14);
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.15s;
  text-transform: uppercase;
}
.voice-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ————————————————————————————————————————
   Composer
———————————————————————————————————————— */

.composer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
  position: relative;
  transition: border-color 0.2s, background 0.2s;
}
.composer::before {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.composer:focus-within::before { opacity: 0.6; }
.composer:focus-within {
  background: rgba(255,255,255,0.03);
  box-shadow: 0 0 40px var(--accent-soft);
}

.composer-prompt {
  color: var(--accent);
  font-size: 14px;
}
.composer-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ink);
  font-family: inherit;
  font-size: 16px;
  letter-spacing: 0.01em;
  padding: 0;
}
.composer-input::placeholder { color: var(--ink-faint); }

.composer-send {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.14);
  color: var(--ink);
  font-size: 11px;
  letter-spacing: 0.22em;
  padding: 7px 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.composer-send:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.composer-send:disabled { opacity: 0.4; cursor: not-allowed; }

.starters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.starter {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.02em;
  padding: 9px 14px;
  cursor: pointer;
  transition: all 0.15s;
  text-transform: none;
  font-family: inherit;
}
.starter:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--ink);
  background: rgba(255,255,255,0.03);
}
.starter:disabled { opacity: 0.3; cursor: not-allowed; }

/* ————————————————————————————————————————
   Footer
———————————————————————————————————————— */

.footmeta {
  position: relative;
  z-index: 3;
  display: flex;
  gap: 12px;
  padding: 14px 32px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  border-top: 1px solid rgba(255,255,255,0.04);
}

/* ————————————————————————————————————————
   Ambient effects
———————————————————————————————————————— */

.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 30%, rgba(0,0,0,0.7) 100%);
  z-index: 1;
  pointer-events: none;
}

.scanlines {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(255,255,255,0.008) 0px,
    rgba(255,255,255,0.008) 1px,
    transparent 1px,
    transparent 4px
  );
  z-index: 2;
  pointer-events: none;
  mix-blend-mode: overlay;
}

/* ————————————————————————————————————————
   Tweaks panel
———————————————————————————————————————— */

.settings-fab {
  position: fixed;
  right: 20px; bottom: 20px;
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(12,9,8,0.85);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--ink-dim);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  z-index: 19;
  backdrop-filter: blur(8px);
  transition: color 0.2s, border-color 0.2s, transform 0.4s;
}
.settings-fab:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: rotate(45deg);
}

.tweaks-foot {
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  text-transform: uppercase;
  text-align: center;
  padding-top: 4px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.tweaks {
  position: fixed;
  right: 20px; bottom: 68px;
  width: 280px;
  background: rgba(12,9,8,0.95);
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  padding: 16px;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 12px;
}
.tweaks-head {
  display: flex; justify-content: space-between; align-items: center;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
  text-transform: uppercase;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.tweaks-head button {
  background: none; border: none; color: var(--ink-dim); cursor: pointer;
  font-size: 18px; line-height: 1;
}
.tweak-row { display: flex; flex-direction: column; gap: 8px; }
.tweak-row label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--ink-dim);
  text-transform: uppercase;
  display: flex; justify-content: space-between; align-items: center;
}
.seg { display: flex; gap: 4px; }
.seg button {
  flex: 1;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--ink-dim);
  padding: 6px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  cursor: pointer;
}
.seg button.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.tweak-row input[type="range"] { width: 100%; accent-color: var(--accent); }

.hue-presets { display: flex; gap: 6px; margin-top: 4px; }
.hue-swatch {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  cursor: pointer;
  padding: 0;
}

.tweak-row input[type="checkbox"] { accent-color: var(--accent); margin-right: 6px; }