/* ============================================================================
   XEN AI 2.0 — GLOBAL STYLESHEET
   ----------------------------------------------------------------------------
   Design tokens + layout for index.html. Dark technical console aesthetic:
   near-black base, single vivid orange accent, glass panels, HUD hairlines.
   ============================================================================ */

:root {
  /* --- color tokens -------------------------------------------------- */
  --xen-void: #07080a;
  --xen-void-deep: #030304;
  --xen-panel: #101317;
  --xen-panel-raised: #14181d;
  --xen-line: rgba(255, 255, 255, 0.08);
  --xen-line-strong: rgba(255, 255, 255, 0.16);
  --xen-orange: #ff6a1f;
  --xen-orange-soft: rgba(255, 106, 31, 0.16);
  --xen-orange-deep: #b7410e;
  --xen-amber: #ffb37a;
  --xen-ice: #78c8ff;
  --xen-error: #ff4d4f;
  --xen-text: #edf0f3;
  --xen-text-dim: #a7afba;
  --xen-text-faint: #6b7280;

  /* --- type ------------------------------------------------------------ */
  --xen-font-display: "Segoe UI Semibold", "Helvetica Neue", Arial, sans-serif;
  --xen-font-body: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --xen-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* --- layout ------------------------------------------------------------ */
  --xen-radius-sm: 4px;
  --xen-radius: 10px;
  --xen-radius-lg: 18px;
  --xen-header-h: 68px;
  --xen-max-w: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--xen-void);
  color: var(--xen-text);
  font-family: var(--xen-font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.xen-bg {
  background-image:
    radial-gradient(circle at 18% -10%, rgba(255, 106, 31, 0.10), transparent 45%),
    radial-gradient(circle at 82% 0%, rgba(255, 106, 31, 0.06), transparent 40%),
    linear-gradient(var(--xen-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--xen-line) 1px, transparent 1px);
  background-size: auto, auto, 64px 64px, 64px 64px;
  background-position: 0 0, 0 0, -1px -1px, -1px -1px;
}

a { color: var(--xen-orange); }
button { font-family: inherit; }
::selection { background: var(--xen-orange); color: #100b08; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ============================================================================
   HEADER / NAV
   ============================================================================ */
.xen-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--xen-header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
  background: rgba(7, 8, 10, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--xen-line);
}

.xen-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.xen-brand__mark { width: 30px; height: 30px; }
.xen-brand__text { font-family: var(--xen-font-display); font-size: 17px; letter-spacing: 0.02em; color: var(--xen-text); }
.xen-brand__text b { color: var(--xen-orange); font-weight: 700; }

.xen-nav-actions { display: flex; align-items: center; gap: 14px; }

.xen-status {
  font-family: var(--xen-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--xen-line-strong);
  color: var(--xen-text-dim);
  display: flex;
  align-items: center;
  gap: 7px;
}
.xen-status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--xen-text-faint); }
.xen-status--idle::before { background: var(--xen-text-faint); }
.xen-status--listening { color: var(--xen-ice); border-color: rgba(120,200,255,0.4); }
.xen-status--listening::before { background: var(--xen-ice); box-shadow: 0 0 8px var(--xen-ice); }
.xen-status--processing, .xen-status--thinking { color: var(--xen-orange); border-color: rgba(255,106,31,0.4); }
.xen-status--processing::before { background: var(--xen-orange); box-shadow: 0 0 8px var(--xen-orange); }
.xen-status--speaking { color: var(--xen-amber); border-color: rgba(255,179,122,0.4); }
.xen-status--speaking::before { background: var(--xen-amber); box-shadow: 0 0 8px var(--xen-amber); }
.xen-status--error { color: var(--xen-error); border-color: rgba(255,77,79,0.4); }
.xen-status--error::before { background: var(--xen-error); box-shadow: 0 0 8px var(--xen-error); }

.xen-link-btn {
  font-size: 13px;
  color: var(--xen-text-dim);
  text-decoration: none;
  border: 1px solid var(--xen-line-strong);
  padding: 8px 14px;
  border-radius: var(--xen-radius-sm);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.xen-link-btn:hover { color: var(--xen-orange); border-color: var(--xen-orange); }

/* ============================================================================
   HERO / CORE
   ============================================================================ */
.xen-hero {
  max-width: var(--xen-max-w);
  margin: 0 auto;
  padding: 56px 22px 24px;
  text-align: center;
}

.xen-core-stage {
  position: relative;
  width: min(340px, 70vw);
  height: min(340px, 70vw);
  margin: 0 auto 18px;
}
.xen-core-stage canvas { width: 100%; height: 100%; display: block; }

.xen-core-stage__corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--xen-orange);
  opacity: 0.55;
}
.xen-core-stage__corner--tl { top: -6px; left: -6px; border-right: none; border-bottom: none; }
.xen-core-stage__corner--tr { top: -6px; right: -6px; border-left: none; border-bottom: none; }
.xen-core-stage__corner--bl { bottom: -6px; left: -6px; border-right: none; border-top: none; }
.xen-core-stage__corner--br { bottom: -6px; right: -6px; border-left: none; border-top: none; }

.xen-hero__title {
  font-family: var(--xen-font-display);
  font-size: clamp(28px, 5vw, 44px);
  margin: 6px 0 4px;
  letter-spacing: 0.01em;
}
.xen-hero__subtitle {
  color: var(--xen-text-dim);
  font-size: 15px;
  margin: 0 0 22px;
}

.xen-listen-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid var(--xen-orange);
  background: var(--xen-orange-soft);
  color: var(--xen-orange);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease;
}
.xen-listen-btn:hover { background: rgba(255, 106, 31, 0.26); transform: translateY(-1px); }
.xen-listen-btn:active { transform: translateY(0); }
.xen-listen-btn__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--xen-orange); }

.xen-stop-speak {
  margin-left: 10px;
  padding: 13px 18px;
  border-radius: 999px;
  border: 1px solid var(--xen-line-strong);
  background: transparent;
  color: var(--xen-text-dim);
  cursor: pointer;
  font-size: 13px;
}
.xen-stop-speak:hover { color: var(--xen-text); border-color: var(--xen-text-dim); }

/* ============================================================================
   TRANSCRIPT
   ============================================================================ */
.xen-transcript {
  max-width: 640px;
  margin: 22px auto 0;
  padding: 14px 18px;
  border: 1px solid var(--xen-line);
  border-left: 2px solid var(--xen-orange);
  border-radius: var(--xen-radius-sm);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--xen-font-mono);
  font-size: 13px;
  color: var(--xen-text-dim);
  text-align: left;
  min-height: 20px;
}
.xen-transcript.is-final { color: var(--xen-text); }
.xen-transcript__label {
  display: block;
  font-family: var(--xen-font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--xen-text-faint);
  margin-bottom: 4px;
}

/* ============================================================================
   QUICK QUESTIONS
   ============================================================================ */
.xen-section {
  max-width: var(--xen-max-w);
  margin: 0 auto;
  padding: 30px 22px;
}
.xen-section__title {
  font-family: var(--xen-font-display);
  font-size: 15px;
  color: var(--xen-text-dim);
  margin: 0 0 14px;
  font-weight: 600;
}

.xen-quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.xen-quick-card {
  text-align: left;
  background: var(--xen-panel);
  border: 1px solid var(--xen-line);
  color: var(--xen-text);
  padding: 14px 16px;
  border-radius: var(--xen-radius-sm);
  cursor: pointer;
  font-size: 13.5px;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.xen-quick-card:hover { border-color: var(--xen-orange); background: var(--xen-panel-raised); }

/* ============================================================================
   CHAT
   ============================================================================ */
.xen-chat-panel {
  max-width: 780px;
  margin: 0 auto 40px;
  padding: 0 22px;
}

.xen-chat-log {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: 460px;
  overflow-y: auto;
  padding: 18px;
  border: 1px solid var(--xen-line);
  border-radius: var(--xen-radius);
  background: rgba(255, 255, 255, 0.015);
}
.xen-chat-log:empty::before {
  content: "No conversation yet — ask something, or tap a quick question above.";
  color: var(--xen-text-faint);
  font-size: 13px;
}

.xen-msg { display: flex; flex-direction: column; max-width: 86%; }
.xen-msg--user { align-self: flex-end; align-items: flex-end; }
.xen-msg--xen { align-self: flex-start; align-items: flex-start; }

.xen-msg__bubble {
  padding: 12px 15px;
  border-radius: var(--xen-radius-sm);
  font-size: 14px;
  line-height: 1.55;
}
.xen-msg--user .xen-msg__bubble {
  background: var(--xen-orange-soft);
  border: 1px solid rgba(255, 106, 31, 0.35);
  color: var(--xen-text);
}
.xen-msg__bubble--xen {
  background: var(--xen-panel);
  border: 1px solid var(--xen-line);
}
.xen-msg__bubble--xen p { margin: 0 0 8px; }
.xen-msg__bubble--xen p:last-child { margin-bottom: 0; }
.xen-msg__bubble--xen .xen-list { margin: 6px 0; padding-left: 18px; }
.xen-msg__bubble--xen .xen-caveat { color: var(--xen-text-dim); font-size: 12.5px; font-style: italic; }
.xen-msg__bubble--xen .xen-eyebrow-inline { color: var(--xen-orange); font-size: 11px; letter-spacing: 0.08em; margin: 0 0 6px; }
.xen-msg__bubble--xen code { font-family: var(--xen-font-mono); background: rgba(255,255,255,0.06); padding: 1px 5px; border-radius: 3px; }

.xen-msg__meta { font-size: 10.5px; color: var(--xen-text-faint); margin-top: 4px; }

.xen-badge {
  display: inline-block;
  font-family: var(--xen-font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--xen-orange-soft);
  color: var(--xen-orange);
  margin-bottom: 8px;
}

.xen-msg__actions { display: flex; gap: 6px; margin-top: 8px; }
.xen-icon-btn {
  border: 1px solid var(--xen-line);
  background: transparent;
  color: var(--xen-text-dim);
  border-radius: var(--xen-radius-sm);
  width: 28px; height: 28px;
  font-size: 12px;
  cursor: pointer;
}
.xen-icon-btn:hover { color: var(--xen-orange); border-color: var(--xen-orange); }

.xen-chat-form {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.xen-chat-form input {
  flex: 1;
  padding: 13px 16px;
  border-radius: var(--xen-radius-sm);
  border: 1px solid var(--xen-line-strong);
  background: var(--xen-panel);
  color: var(--xen-text);
  font-size: 14px;
}
.xen-chat-form input:focus { outline: none; border-color: var(--xen-orange); }
.xen-chat-form button {
  padding: 0 20px;
  border-radius: var(--xen-radius-sm);
  border: 1px solid var(--xen-orange);
  background: var(--xen-orange);
  color: #180d06;
  font-weight: 700;
  cursor: pointer;
}

.xen-chat-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.xen-text-btn {
  background: transparent; border: none; color: var(--xen-text-faint);
  font-size: 12px; cursor: pointer; text-decoration: underline;
}
.xen-text-btn:hover { color: var(--xen-orange); }

/* ============================================================================
   FOOTER
   ============================================================================ */
.xen-footer {
  border-top: 1px solid var(--xen-line);
  padding: 24px 22px 40px;
  text-align: center;
  color: var(--xen-text-faint);
  font-size: 12px;
}

/* ============================================================================
   TOAST
   ============================================================================ */
.xen-toast-host {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
}
.xen-toast {
  padding: 10px 18px;
  background: var(--xen-panel-raised);
  border: 1px solid var(--xen-line-strong);
  border-radius: var(--xen-radius-sm);
  font-size: 13px;
  color: var(--xen-text);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.xen-toast.show { opacity: 1; transform: translateY(0); }
.xen-toast--ok { border-color: var(--xen-orange); }
.xen-toast--error { border-color: var(--xen-error); color: #ffdada; }

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 620px) {
  .xen-brand__text { font-size: 14px; }
  .xen-hero { padding: 34px 16px 16px; }
  .xen-chat-log { max-height: 360px; }
  .xen-nav-actions .xen-link-btn { display: none; }
}

/* focus visibility */
button:focus-visible, input:focus-visible, a:focus-visible {
  outline: 2px solid var(--xen-orange);
  outline-offset: 2px;
}