/* ============================================================
   BIFROST — Design System & Styles  v2.0
   Premium dark UI · Glassmorphism · AMD Hackathon
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Surfaces */
  --bg-deep:       #050509;
  --bg-base:       #08080e;
  --bg-raised:     #0f0f18;
  --bg-card:       rgba(14, 14, 22, 0.60);
  --bg-card-solid: #10101a;
  --bg-input:      rgba(255,255,255,0.035);
  --border-subtle: rgba(255,255,255,0.055);
  --border-focus:  rgba(255,107,0,0.50);

  /* Accent palette */
  --accent:        #FF6B00;
  --accent-warm:   #F59E0B;
  --accent-glow:   rgba(255,107,0,0.25);
  --accent-dim:    rgba(255,107,0,0.10);

  /* Tier colors — size-based */
  --tier-small:     #10B981;
  --tier-medium:    #F59E0B;
  --tier-large:     #EF4444;
  --tier-small-bg:  rgba(16,185,129,0.12);
  --tier-medium-bg: rgba(245,158,11,0.12);
  --tier-large-bg:  rgba(239,68,68,0.12);

  /* Tier colors — locality */
  --tier-local:       #10B981;
  --tier-local-bg:    rgba(16,185,129,0.10);
  --tier-local-glow:  rgba(16,185,129,0.35);
  --tier-remote:      #F59E0B;
  --tier-remote-bg:   rgba(245,158,11,0.10);
  --tier-remote-glow: rgba(245,158,11,0.35);

  /* Category colors (8 original + 8 new semantic) */
  --cat-general:      #8B5CF6;
  --cat-code:         #06B6D4;
  --cat-math:         #F59E0B;
  --cat-creative:     #EC4899;
  --cat-analysis:     #3B82F6;
  --cat-simple:       #10B981;
  --cat-translation:  #F97316;
  --cat-conversation: #A78BFA;

  /* New category custom properties */
  --cat-factual:          #3B82F6;
  --cat-mathematical:     #F59E0B;
  --cat-sentiment:        #EC4899;
  --cat-summarization:    #8B5CF6;
  --cat-ner:              #14B8A6;
  --cat-code-debug:       #EF4444;
  --cat-code-gen:         #06B6D4;
  --cat-logic:            #6366F1;

  /* Text */
  --text-primary:   rgba(255,255,255,0.93);
  --text-secondary: rgba(255,255,255,0.52);
  --text-tertiary:  rgba(255,255,255,0.28);
  --text-accent:    var(--accent);

  /* Spacing scale */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px;
  --sp-4: 16px; --sp-5: 20px; --sp-6: 24px;
  --sp-8: 32px; --sp-10: 40px; --sp-12: 48px;

  /* Radii */
  --r-sm: 8px;  --r-md: 12px; --r-lg: 16px; --r-xl: 24px; --r-full: 9999px;

  /* Glass — refined */
  --glass-blur:   24px;
  --glass-bg:     rgba(14,14,22,0.52);
  --glass-border: rgba(255,255,255,0.07);
  --glass-sheen:  rgba(255,255,255,0.03);

  /* Transitions */
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --dur-fast: 150ms;
  --dur-med:  300ms;
  --dur-slow: 500ms;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.55;
}

/* ---------- Scrollbar — thinner & subtler ---------- */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.07);
  border-radius: var(--r-full);
  transition: background var(--dur-fast) ease;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.14); }
::-webkit-scrollbar-corner { background: transparent; }
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.07) transparent;
}

/* ---------- Ambient Background ---------- */
.ambient-bg {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none; overflow: hidden;
}
.ambient-orb {
  position: absolute; border-radius: 50%;
  filter: blur(140px); opacity: 0.06;
  animation: orbFloat 25s ease-in-out infinite;
  will-change: transform;
}
.ambient-orb--1 {
  width: 650px; height: 650px; top: -18%; left: -10%;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  animation-duration: 22s;
}
.ambient-orb--2 {
  width: 550px; height: 550px; bottom: -12%; right: -6%;
  background: radial-gradient(circle, var(--accent-warm) 0%, transparent 70%);
  animation-duration: 28s; animation-delay: -8s;
}
.ambient-orb--3 {
  width: 380px; height: 380px; top: 38%; left: 52%;
  background: radial-gradient(circle, #8B5CF6 0%, transparent 70%);
  animation-duration: 32s; animation-delay: -15s; opacity: 0.03;
}
@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(30px, -40px) scale(1.05); }
  66%      { transform: translate(-20px, 25px) scale(0.95); }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(28px) saturate(1.6);
  -webkit-backdrop-filter: blur(28px) saturate(1.6);
  background: rgba(5,5,9,0.78);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 1px 24px rgba(0,0,0,0.3);
}
.header-inner {
  max-width: 1440px; margin: 0 auto;
  padding: var(--sp-3) var(--sp-6);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-4);
}
.logo-group { display: flex; flex-direction: column; gap: 2px; }
.logo {
  display: flex; align-items: center; gap: var(--sp-3);
  font-size: 1.45rem; font-weight: 800; letter-spacing: -0.03em;
  position: relative;
}
.logo-icon { display: flex; animation: logoPulse 4s ease-in-out infinite; }
@keyframes logoPulse {
  0%, 100% { filter: drop-shadow(0 0 4px var(--accent-glow)); }
  50%      { filter: drop-shadow(0 0 14px var(--accent-glow)); }
}
.logo-text {
  background: linear-gradient(135deg, #FF6B00 0%, #F59E0B 45%, #FF8C33 100%);
  background-size: 200% auto;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: textShimmer 6s ease-in-out infinite;
}
@keyframes textShimmer {
  0%, 100% { background-position: 0% center; }
  50%      { background-position: 100% center; }
}
.logo-ember {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent), 0 0 20px var(--accent-glow);
  animation: emberGlow 2s ease-in-out infinite;
  margin-left: -4px; margin-top: -12px;
}
@keyframes emberGlow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.5; transform: scale(0.7); }
}
.tagline {
  font-size: 0.76rem; font-weight: 400;
  color: var(--text-secondary); letter-spacing: 0.02em;
  padding-left: 40px;
}
.header-actions { display: flex; align-items: center; gap: var(--sp-5); }

/* Provider badge */
.model-provider-badge {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3); border-radius: var(--r-full);
  background: var(--bg-input); border: 1px solid var(--border-subtle);
  font-size: 0.72rem; font-weight: 500; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.06em;
  transition: border-color var(--dur-fast) ease;
}
.model-provider-badge:hover { border-color: rgba(255,255,255,0.12); }
.provider-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--tier-small);
  box-shadow: 0 0 6px rgba(16,185,129,0.4);
  animation: providerPulse 3s ease-in-out infinite;
}
@keyframes providerPulse {
  0%, 100% { box-shadow: 0 0 4px rgba(16,185,129,0.3); }
  50%      { box-shadow: 0 0 10px rgba(16,185,129,0.5); }
}

/* Compare toggle */
.compare-toggle {
  display: flex; align-items: center; gap: var(--sp-2);
  cursor: pointer; user-select: none;
}
.compare-toggle input { display: none; }
.toggle-track {
  width: 38px; height: 20px; border-radius: var(--r-full);
  background: rgba(255,255,255,0.06); position: relative;
  transition: background var(--dur-med) var(--ease-out),
              border-color var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out);
  border: 1px solid var(--border-subtle);
}
.toggle-thumb {
  position: absolute; top: 2px; left: 2px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--text-secondary);
  transition: all var(--dur-med) var(--ease-spring);
}
.compare-toggle input:checked ~ .toggle-track {
  background: var(--accent-dim);
  border-color: var(--border-focus);
  box-shadow: 0 0 12px var(--accent-dim);
}
.compare-toggle input:checked ~ .toggle-track .toggle-thumb {
  left: 20px; background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}
.toggle-label { font-size: 0.78rem; font-weight: 500; color: var(--text-secondary); }

/* ---------- App Layout ---------- */
.app-layout {
  position: relative; z-index: 1;
  max-width: 1440px; margin: 0 auto;
  padding: var(--sp-4) var(--sp-6) 0;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--sp-4);
  height: calc(100vh - 68px - 72px);
  min-height: 500px;
}

/* ---------- Panel Chrome ---------- */
.panel-chrome {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
  background: rgba(255,255,255,0.012);
}
.chrome-dots { display: flex; gap: 5px; }
.chrome-dots i {
  width: 8px; height: 8px; border-radius: 50%;
  background: rgba(255,255,255,0.06);
  transition: opacity var(--dur-fast) ease;
}
.chrome-dots i:first-child  { background: rgba(239,68,68,0.45); }
.chrome-dots i:nth-child(2) { background: rgba(245,158,11,0.45); }
.chrome-dots i:last-child   { background: rgba(16,185,129,0.45); }
.chrome-title {
  font-size: 0.76rem; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.08em; flex: 1;
}
.chrome-badge {
  font-size: 0.66rem; font-weight: 500; color: var(--text-tertiary);
  padding: 2px 8px; border-radius: var(--r-full);
  background: var(--bg-input);
}
.chrome-refresh {
  background: none; border: none; color: var(--text-tertiary);
  cursor: pointer; padding: 4px; border-radius: var(--r-sm);
  transition: all var(--dur-fast) ease;
  display: flex; align-items: center;
}
.chrome-refresh:hover { color: var(--accent); background: var(--accent-dim); }

/* ---------- Chat Panel ---------- */
.chat-panel {
  display: flex; flex-direction: column;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  min-height: 0;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.03) inset,
    0 8px 32px rgba(0,0,0,0.25);
}
.chat-messages {
  flex: 1; overflow-y: auto;
  padding: var(--sp-5); display: flex; flex-direction: column;
  gap: var(--sp-4);
}

/* Welcome */
.chat-welcome {
  display: flex; flex-direction: column; align-items: center;
  text-align: center; padding: var(--sp-12) var(--sp-6);
  gap: var(--sp-4); animation: fadeUp 0.6s var(--ease-out) both;
}
.welcome-icon { opacity: 0.65; }
.chat-welcome h3 { font-size: 1.2rem; font-weight: 700; color: var(--text-primary); }
.chat-welcome p  { font-size: 0.88rem; color: var(--text-secondary); max-width: 380px; line-height: 1.65; }
.welcome-hints { display: flex; flex-wrap: wrap; gap: var(--sp-2); justify-content: center; margin-top: var(--sp-2); }
.hint-chip {
  font-family: inherit; font-size: 0.76rem; color: var(--text-secondary);
  background: var(--bg-input); border: 1px solid var(--border-subtle);
  padding: var(--sp-2) var(--sp-3); border-radius: var(--r-full);
  cursor: pointer;
  transition: all var(--dur-med) var(--ease-out);
  white-space: nowrap; max-width: 300px; overflow: hidden; text-overflow: ellipsis;
}
.hint-chip:hover {
  border-color: var(--border-focus); color: var(--accent);
  background: var(--accent-dim);
  box-shadow: 0 0 16px var(--accent-dim);
  transform: translateY(-1px);
}

/* ---------- Messages ---------- */
.msg {
  display: flex; flex-direction: column; gap: var(--sp-2);
  animation: msgEnter 0.45s var(--ease-out) both;
}
.msg--user { align-items: flex-end; }
.msg--bot  { align-items: flex-start; }

.msg-bubble {
  max-width: 85%; padding: var(--sp-4) var(--sp-5);
  border-radius: var(--r-lg); font-size: 0.92rem; line-height: 1.7;
  word-break: break-word;
  position: relative;
}

/* User bubbles */
.msg--user .msg-bubble {
  background: linear-gradient(135deg, var(--accent) 0%, #d95a00 100%);
  color: #fff; border-bottom-right-radius: var(--sp-1);
  box-shadow:
    0 2px 12px rgba(255,107,0,0.15),
    0 0 0 1px rgba(255,255,255,0.06) inset;
}

/* Bot bubbles — left accent border + refined bg */
.msg--bot .msg-bubble {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent);
  color: var(--text-primary);
  border-bottom-left-radius: var(--sp-1);
  box-shadow:
    0 2px 8px rgba(0,0,0,0.15),
    0 0 0 1px rgba(255,255,255,0.02) inset;
}
.msg--bot .msg-bubble::before {
  content: '';
  position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-warm) 100%);
  border-radius: 3px 0 0 3px;
  opacity: 0;
}

@keyframes msgEnter {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Metadata bar */
.msg-meta {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: var(--sp-2); padding: 0 var(--sp-1);
}
.meta-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 9px; border-radius: var(--r-full);
  font-size: 0.64rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em;
  border: 1px solid transparent;
  transition: all var(--dur-fast) ease;
}
.meta-badge--category {
  background: rgba(139,92,246,0.10);
  color: #A78BFA;
  border-color: rgba(139,92,246,0.18);
}
.meta-badge--tier { font-weight: 700; }

/* Size-based tier badges */
.meta-badge--tier.tier-SMALL {
  background: var(--tier-small-bg);
  color: var(--tier-small);
  border-color: rgba(16,185,129,0.25);
}
.meta-badge--tier.tier-MEDIUM {
  background: var(--tier-medium-bg);
  color: var(--tier-medium);
  border-color: rgba(245,158,11,0.25);
}
.meta-badge--tier.tier-LARGE {
  background: var(--tier-large-bg);
  color: var(--tier-large);
  border-color: rgba(239,68,68,0.25);
}

/* Locality-based tier badges with glow */
.meta-badge--tier.tier-LOCAL {
  background: var(--tier-local-bg);
  color: var(--tier-local);
  border-color: rgba(16,185,129,0.30);
  box-shadow: 0 0 10px var(--tier-local-glow), 0 0 2px var(--tier-local-glow) inset;
}
.meta-badge--tier.tier-REMOTE {
  background: var(--tier-remote-bg);
  color: var(--tier-remote);
  border-color: rgba(245,158,11,0.30);
  box-shadow: 0 0 10px var(--tier-remote-glow), 0 0 2px var(--tier-remote-glow) inset;
}

.meta-stat {
  font-size: 0.66rem; color: var(--text-tertiary); font-weight: 500;
  display: inline-flex; align-items: center; gap: 3px;
}
.meta-stat svg { width: 11px; height: 11px; opacity: 0.55; }

/* ---------- Confidence bar — gradient red→amber→green ---------- */
.confidence-bar {
  display: inline-flex; align-items: center; gap: 4px;
}
.conf-track {
  width: 44px; height: 4px; border-radius: 2px;
  background: rgba(255,255,255,0.06); overflow: hidden;
}
.conf-fill {
  height: 100%; border-radius: 2px;
  background: linear-gradient(90deg, #EF4444 0%, #F59E0B 50%, #10B981 100%);
  background-size: 200% 100%;
  transition: width 0.7s var(--ease-out);
}

/* Escalated indicator */
.meta-badge--escalated {
  background: rgba(239,68,68,0.12); color: var(--tier-large);
  border-color: rgba(239,68,68,0.25);
  animation: escalatedPulse 2s ease-in-out infinite;
}
@keyframes escalatedPulse {
  0%, 100% { box-shadow: 0 0 4px rgba(239,68,68,0.15); }
  50% { box-shadow: 0 0 12px rgba(239,68,68,0.3); }
  animation: badgePulse 1.5s ease-in-out 3;
}

/* ---------- Category-specific badge colors (original) ---------- */
.cat-general      { background: rgba(139,92,246,0.10) !important; color: #A78BFA !important; border-color: rgba(139,92,246,0.18) !important; }
.cat-code         { background: rgba(6,182,212,0.10)  !important; color: #22D3EE !important; border-color: rgba(6,182,212,0.18)  !important; }
.cat-math         { background: rgba(245,158,11,0.10) !important; color: #FBBF24 !important; border-color: rgba(245,158,11,0.18) !important; }
.cat-creative     { background: rgba(236,72,153,0.10) !important; color: #F472B6 !important; border-color: rgba(236,72,153,0.18) !important; }
.cat-analysis     { background: rgba(59,130,246,0.10) !important; color: #60A5FA !important; border-color: rgba(59,130,246,0.18) !important; }
.cat-simple       { background: rgba(16,185,129,0.10) !important; color: #34D399 !important; border-color: rgba(16,185,129,0.18) !important; }
.cat-translation  { background: rgba(249,115,22,0.10) !important; color: #FB923C !important; border-color: rgba(249,115,22,0.18) !important; }
.cat-conversation { background: rgba(167,139,250,0.10)!important; color: #C4B5FD !important; border-color: rgba(167,139,250,0.18)!important; }

/* ---------- Category-specific badge colors (new semantic) ---------- */
.cat-factual          { background: rgba(59,130,246,0.10)  !important; color: #60A5FA !important; border-color: rgba(59,130,246,0.20)  !important; }
.cat-mathematical     { background: rgba(245,158,11,0.10) !important; color: #FBBF24 !important; border-color: rgba(245,158,11,0.20) !important; }
.cat-sentiment        { background: rgba(236,72,153,0.10) !important; color: #F472B6 !important; border-color: rgba(236,72,153,0.20) !important; }
.cat-summarization    { background: rgba(139,92,246,0.10) !important; color: #A78BFA !important; border-color: rgba(139,92,246,0.20) !important; }
.cat-ner              { background: rgba(20,184,166,0.10) !important; color: #2DD4BF !important; border-color: rgba(20,184,166,0.20) !important; }
.cat-codedebugging    { background: rgba(239,68,68,0.10)  !important; color: #F87171 !important; border-color: rgba(239,68,68,0.20)  !important; }
.cat-codegeneration   { background: rgba(6,182,212,0.10)  !important; color: #22D3EE !important; border-color: rgba(6,182,212,0.20)  !important; }
.cat-logicalreasoning { background: rgba(99,102,241,0.10) !important; color: #818CF8 !important; border-color: rgba(99,102,241,0.20) !important; }

/* ---------- Typing indicator ---------- */
.typing-indicator {
  display: flex; gap: 5px; padding: var(--sp-3) var(--sp-4);
  background: var(--bg-raised); border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-lg); border-bottom-left-radius: var(--sp-1);
  width: fit-content; animation: msgEnter 0.3s var(--ease-out) both;
}
.typing-indicator span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); opacity: 0.35;
  animation: typingBounce 1.4s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.35; }
  30%           { transform: translateY(-5px); opacity: 1; }
}

/* Routing animation badge */
.routing-anim {
  animation: badgePulse 0.8s ease-in-out infinite;
}
@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50%      { box-shadow: 0 0 0 6px transparent; }
}

/* ---------- Chat Input ---------- */
.chat-input-area {
  padding: var(--sp-3) var(--sp-4); border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
  background: rgba(255,255,255,0.01);
}
.input-wrapper {
  display: flex; align-items: flex-end; gap: var(--sp-2);
  background: var(--bg-input); border: 1px solid var(--border-subtle);
  border-radius: var(--r-md); padding: var(--sp-2) var(--sp-3);
  transition: border-color var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out);
}
.input-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-dim), 0 0 20px rgba(255,107,0,0.06);
}
#chatInput {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text-primary); font-family: inherit;
  font-size: 0.92rem; resize: none; line-height: 1.5;
  max-height: 120px; padding: var(--sp-1) 0;
}
#chatInput::placeholder { color: var(--text-tertiary); }
.send-btn {
  width: 36px; height: 36px; border-radius: var(--r-sm);
  background: var(--accent); border: none; color: #fff;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all var(--dur-fast) var(--ease-out);
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(255,107,0,0.2);
}
.send-btn:hover {
  background: #e05e00;
  transform: scale(1.06);
  box-shadow: 0 4px 14px rgba(255,107,0,0.3);
}
.send-btn:active { transform: scale(0.94); }
.send-btn:disabled { opacity: 0.3; cursor: not-allowed; transform: none; box-shadow: none; }
.input-hint {
  margin-top: var(--sp-2); font-size: 0.66rem; color: var(--text-tertiary);
  text-align: center;
}
.input-hint kbd {
  padding: 1px 5px; border-radius: 4px;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.07);
  font-family: inherit; font-size: 0.62rem;
}

/* ---------- Analytics Panel ---------- */
.analytics-panel {
  display: flex; flex-direction: column;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  overflow: hidden; min-height: 0;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.03) inset,
    0 8px 32px rgba(0,0,0,0.25);
}
.analytics-scroll {
  flex: 1; overflow-y: auto; padding: var(--sp-4);
  display: flex; flex-direction: column; gap: var(--sp-3);
}

/* ---------- KPI Strip ---------- */
.kpi-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-2);
}
.kpi-card {
  display: flex; flex-direction: column; align-items: center;
  gap: 2px; padding: var(--sp-3) var(--sp-2);
  background: var(--bg-input); border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: all var(--dur-med) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.kpi-card::after {
  content: ''; position: absolute; inset: 0;
  border-radius: var(--r-sm);
  opacity: 0;
  background: radial-gradient(circle at 50% 80%, rgba(255,255,255,0.04), transparent 70%);
  transition: opacity var(--dur-med) ease;
}
.kpi-card:hover {
  border-color: var(--border-subtle);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.kpi-card:hover::after { opacity: 1; }
.kpi-value {
  font-size: 1.2rem; font-weight: 700; color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 20px rgba(255,255,255,0.06);
  position: relative; z-index: 1;
}
.kpi-value small { font-size: 0.64rem; font-weight: 500; opacity: 0.55; }
.kpi-label {
  font-size: 0.60rem; font-weight: 500; color: var(--text-tertiary);
  text-transform: uppercase; letter-spacing: 0.06em;
  position: relative; z-index: 1;
}
.kpi-card--accent .kpi-value {
  color: var(--tier-large);
  text-shadow: 0 0 18px rgba(239,68,68,0.15);
}

/* ---------- Analytics Cards — hover lift & inner glow ---------- */
.analytics-card {
  background: rgba(255,255,255,0.018);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md); padding: var(--sp-4);
  transition: all var(--dur-med) var(--ease-out);
  position: relative;
}
.analytics-card::before {
  content: ''; position: absolute; inset: 0;
  border-radius: var(--r-md);
  background: radial-gradient(ellipse at 50% 0%, rgba(255,255,255,0.025), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-med) ease;
  pointer-events: none;
}
.analytics-card:hover {
  border-color: rgba(255,255,255,0.10);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.20);
}
.analytics-card:hover::before { opacity: 1; }
.card-heading {
  font-size: 0.72rem; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.07em;
  margin-bottom: var(--sp-3);
}
.empty-state {
  font-size: 0.8rem; color: var(--text-tertiary);
  text-align: center; padding: var(--sp-6) 0;
}

/* Donut Chart */
.donut-container { position: relative; display: flex; justify-content: center; margin-bottom: var(--sp-3); }
.donut-svg { width: 140px; height: 140px; transform: rotate(-90deg); }
.donut-svg circle, .donut-svg .donut-seg {
  transition: stroke-dasharray 0.8s var(--ease-out), stroke-dashoffset 0.8s var(--ease-out);
}
.donut-center {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center;
  pointer-events: none;
}
.donut-total { font-size: 1.4rem; font-weight: 800; color: var(--text-primary); }
.donut-sublabel { font-size: 0.60rem; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.06em; }
.donut-legend { display: flex; justify-content: center; gap: var(--sp-4); }
.legend-item {
  display: flex; align-items: center; gap: var(--sp-2);
  font-size: 0.72rem; color: var(--text-secondary); font-weight: 500;
}
.legend-dot { width: 8px; height: 8px; border-radius: 2px; background: var(--c); flex-shrink: 0; }
.legend-val { margin-left: auto; font-variant-numeric: tabular-nums; color: var(--text-tertiary); padding-left: var(--sp-2); }

/* Bar Chart */
.bar-chart { display: flex; flex-direction: column; gap: var(--sp-3); }
.bar-row { display: flex; flex-direction: column; gap: 3px; }
.bar-label-row { display: flex; justify-content: space-between; align-items: baseline; }
.bar-label { font-size: 0.72rem; font-weight: 500; color: var(--text-secondary); text-transform: capitalize; }
.bar-value { font-size: 0.68rem; font-weight: 600; color: var(--text-tertiary); font-variant-numeric: tabular-nums; }
.bar-track { height: 7px; border-radius: 4px; background: rgba(255,255,255,0.035); overflow: hidden; }
.bar-fill {
  height: 100%; border-radius: 4px; min-width: 2px;
  transition: width 0.8s var(--ease-out);
}

/* Model Tiers */
.model-tiers { display: flex; flex-direction: column; gap: var(--sp-2); }
.model-tier-row {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  background: var(--bg-input);
  transition: all var(--dur-fast) ease;
}
.model-tier-row:hover {
  background: rgba(255,255,255,0.05);
}
.tier-dot {
  width: 8px; height: 8px; border-radius: 2px; flex-shrink: 0;
}
.tier-dot.t-SMALL  { background: var(--tier-small); }
.tier-dot.t-MEDIUM { background: var(--tier-medium); }
.tier-dot.t-LARGE  { background: var(--tier-large); }
.model-tier-name {
  font-size: 0.78rem; font-weight: 500; color: var(--text-primary);
  flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.model-tier-label {
  font-size: 0.64rem; font-weight: 600; color: var(--text-tertiary);
  text-transform: uppercase; letter-spacing: 0.04em;
}

/* ---------- Compare Overlay ---------- */
.compare-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(5,5,9,0.90);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  display: flex; flex-direction: column;
  padding: var(--sp-6);
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-med) var(--ease-out);
}
.compare-overlay.active { opacity: 1; pointer-events: auto; }
.compare-header {
  display: flex; align-items: center; gap: var(--sp-4);
  margin-bottom: var(--sp-5); flex-shrink: 0;
}
.compare-header h3 { font-size: 1.1rem; font-weight: 700; }
.compare-query {
  flex: 1; font-size: 0.82rem; color: var(--text-secondary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.compare-close {
  background: none; border: none; color: var(--text-secondary);
  cursor: pointer; padding: var(--sp-2); border-radius: var(--r-sm);
  transition: color var(--dur-fast), background var(--dur-fast); display: flex;
}
.compare-close:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }

.compare-grid {
  flex: 1; overflow-y: auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--sp-4); align-content: start;
}

/* Compare cards — enhanced glass */
.compare-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg); padding: var(--sp-5);
  display: flex; flex-direction: column; gap: var(--sp-4);
  animation: cardEnter 0.5s var(--ease-out) both;
  position: relative; overflow: hidden;
  transition: all var(--dur-med) var(--ease-out);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.compare-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}
.compare-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}

/* Compare card — size tier borders */
.compare-card.tier-SMALL::before  { background: linear-gradient(90deg, var(--tier-small), rgba(16,185,129,0.3)); }
.compare-card.tier-MEDIUM::before { background: linear-gradient(90deg, var(--tier-medium), rgba(245,158,11,0.3)); }
.compare-card.tier-LARGE::before  { background: linear-gradient(90deg, var(--tier-large), rgba(239,68,68,0.3)); }

/* Compare card — locality tier variants */
.compare-card.tier-LOCAL {
  border-color: rgba(16,185,129,0.20);
}
.compare-card.tier-LOCAL::before {
  background: linear-gradient(90deg, var(--tier-local), rgba(16,185,129,0.2));
}
.compare-card.tier-LOCAL:hover {
  border-color: rgba(16,185,129,0.30);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25), 0 0 16px var(--tier-local-glow);
}

.compare-card.tier-REMOTE {
  border-color: rgba(245,158,11,0.20);
}
.compare-card.tier-REMOTE::before {
  background: linear-gradient(90deg, var(--tier-remote), rgba(245,158,11,0.2));
}
.compare-card.tier-REMOTE:hover {
  border-color: rgba(245,158,11,0.30);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25), 0 0 16px var(--tier-remote-glow);
}

.compare-card.recommended { border-color: var(--accent); }
.compare-card.recommended::after {
  content: '★ RECOMMENDED'; position: absolute; top: var(--sp-3); right: var(--sp-3);
  font-size: 0.56rem; font-weight: 700; color: var(--accent);
  padding: 2px 8px; border-radius: var(--r-full);
  background: var(--accent-dim); border: 1px solid rgba(255,107,0,0.2);
  letter-spacing: 0.06em;
}
.compare-card-tier {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em;
}
.compare-card.tier-SMALL .compare-card-tier  { color: var(--tier-small); }
.compare-card.tier-MEDIUM .compare-card-tier { color: var(--tier-medium); }
.compare-card.tier-LARGE .compare-card-tier  { color: var(--tier-large); }
.compare-card.tier-LOCAL .compare-card-tier  { color: var(--tier-local); }
.compare-card.tier-REMOTE .compare-card-tier { color: var(--tier-remote); }
.compare-card-model { font-size: 0.76rem; color: var(--text-tertiary); }
.compare-card-response {
  font-size: 0.88rem; line-height: 1.6; color: var(--text-primary);
  flex: 1; max-height: 200px; overflow-y: auto;
}
.compare-card-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-2);
  padding-top: var(--sp-3); border-top: 1px solid var(--border-subtle);
}
.compare-stat { display: flex; flex-direction: column; }
.compare-stat-val { font-size: 1rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.compare-stat-label { font-size: 0.60rem; color: var(--text-tertiary); text-transform: uppercase; }
.compare-card-error {
  color: var(--tier-large); font-size: 0.84rem; padding: var(--sp-4);
  background: var(--tier-large-bg); border-radius: var(--r-sm);
}

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ---------- Savings Footer — gradient glow ---------- */
.savings-footer {
  position: relative; z-index: 1;
  max-width: 1440px; margin: 0 auto;
  padding: var(--sp-3) var(--sp-6) var(--sp-4);
}
.savings-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-5);
  padding: var(--sp-3) var(--sp-5);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  flex-wrap: wrap;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.02) inset,
    0 4px 24px rgba(0,0,0,0.2);
}
.savings-label-group { display: flex; align-items: center; gap: var(--sp-3); }
.savings-title { font-size: 0.82rem; font-weight: 600; color: var(--text-primary); display: block; }
.savings-sub   { font-size: 0.68rem; color: var(--text-tertiary); display: block; }
.savings-metrics { display: flex; align-items: center; gap: var(--sp-5); }
.savings-metric { display: flex; flex-direction: column; align-items: center; }
.savings-metric-val { font-size: 1.05rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.savings-metric-label { font-size: 0.60rem; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.04em; }
.savings-vs { font-size: 0.72rem; color: var(--text-tertiary); font-weight: 600; }

/* Token savings percentage — prominent gradient glow */
.savings-pct-card {
  display: flex; flex-direction: column; align-items: center;
  padding: var(--sp-3) var(--sp-5);
  background: linear-gradient(135deg, rgba(16,185,129,0.12) 0%, rgba(16,185,129,0.06) 100%);
  border: 1px solid rgba(16,185,129,0.22);
  border-radius: var(--r-md);
  position: relative;
  overflow: hidden;
  box-shadow:
    0 0 20px rgba(16,185,129,0.10),
    0 0 40px rgba(16,185,129,0.05);
  animation: savingsGlow 3s ease-in-out infinite;
}
.savings-pct-card::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(16,185,129,0.08), transparent 70%);
  pointer-events: none;
}
.savings-pct {
  font-size: 2.4rem; font-weight: 900;
  background: linear-gradient(135deg, #34D399 0%, #10B981 40%, #059669 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 12px rgba(16,185,129,0.45));
  position: relative; z-index: 1;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.savings-pct-label {
  font-size: 0.56rem;
  color: var(--tier-small);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.08em;
  position: relative; z-index: 1;
  opacity: 0.85;
}
@keyframes savingsGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(16,185,129,0.10), 0 0 40px rgba(16,185,129,0.05); }
  50%      { box-shadow: 0 0 28px rgba(16,185,129,0.16), 0 0 56px rgba(16,185,129,0.08); }
}

/* ---------- Error message ---------- */
.msg-error {
  display: flex; align-items: flex-start; gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4); border-radius: var(--r-md);
  background: var(--tier-large-bg); border: 1px solid rgba(239,68,68,0.18);
  animation: msgEnter 0.3s var(--ease-out) both;
}
.msg-error-icon { color: var(--tier-large); flex-shrink: 0; margin-top: 1px; }
.msg-error-text { font-size: 0.84rem; color: var(--tier-large); line-height: 1.5; }

/* ---------- Keyframe Animations ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes countPop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.15); }
  100% { transform: scale(1); }
}
@keyframes statsEnter {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.96);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
    height: auto; min-height: 0;
    padding: var(--sp-3);
    gap: var(--sp-3);
  }
  .chat-panel { min-height: 55vh; }
  .analytics-panel { max-height: 50vh; }
  .savings-inner { flex-direction: column; align-items: flex-start; gap: var(--sp-3); }
  .savings-metrics { flex-wrap: wrap; gap: var(--sp-3); }
  .kpi-strip { grid-template-columns: repeat(2, 1fr); }
  .header-inner { flex-direction: column; align-items: flex-start; gap: var(--sp-3); }
  .header-actions { width: 100%; justify-content: space-between; }
  .tagline { padding-left: 0; }
  .compare-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  html { font-size: 14px; }
  .kpi-strip { grid-template-columns: repeat(2, 1fr); }
  .msg-bubble { max-width: 92%; }
  .welcome-hints { flex-direction: column; }
  .savings-pct { font-size: 1.5rem; }
}

/* ---------- Markdown & Code Rendering ---------- */
.markdown-body {
  font-family: inherit;
  font-size: 0.92rem;
  line-height: 1.6;
}
.markdown-body p { margin-bottom: var(--sp-2); }
.markdown-body p:last-child { margin-bottom: 0; }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body ul, .markdown-body ol { margin-left: var(--sp-4); margin-bottom: var(--sp-2); }
.markdown-body strong { color: var(--text-primary); font-weight: 700; }
.markdown-body code:not(pre code) {
  background: rgba(255,255,255,0.08);
  padding: 0.15em 0.3em;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85em;
  color: #ffb86c;
}
.markdown-body pre {
  margin: var(--sp-3) 0;
  border-radius: var(--r-md);
  background: #1e1e24; /* highlight.js atom-one-dark background adjustment */
  border: 1px solid rgba(255,255,255,0.1);
  overflow: hidden;
  position: relative;
}
.markdown-body pre code {
  display: block;
  overflow-x: auto;
  padding: var(--sp-4);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.45;
}
/* Copy Code Button */
.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0,0,0,0.3);
  padding: var(--sp-1) var(--sp-3);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.copy-btn {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-secondary);
  border-radius: var(--r-sm);
  padding: 2px 8px;
  cursor: pointer;
  font-size: 0.7rem;
  transition: all var(--dur-fast) ease;
}
.copy-btn:hover {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}
.copy-btn.copied {
  background: rgba(16, 185, 129, 0.2);
  color: #10B981;
  border-color: rgba(16, 185, 129, 0.5);
}