/* ── ThinkHere App — Qanata Labs Brand Styles ── */

/* ── DARK THEME (default) ── */
[data-theme="dark"] {
  --bg:           #0c0c11;
  --bg-side:      #101015;
  --surface:      #17171e;
  --surface2:     #1e1e27;
  --border:       rgba(255,255,255,0.07);
  --border-md:    rgba(255,255,255,0.12);
  --text:         #f0f0f5;
  --text-muted:   #7a7a96;
  --text-dim:     #44445a;
  --input-bg:     #17171e;
  --pill-bg:      rgba(184,92,56,0.12);
  --pill-border:  rgba(184,92,56,0.28);
  --pill-text:    #c96a42;
  --pill2-bg:     rgba(255,255,255,0.04);
  --pill2-border: rgba(255,255,255,0.09);
  --pill2-text:   rgba(255,255,255,0.32);
  --topbar-bg:    rgba(12,12,17,0.8);
  --btn-ghost-bg: rgba(255,255,255,0.06);
  --btn-ghost-bd: rgba(255,255,255,0.13);
  --hero-h:       #f0f0f5;
  --hero-em:      #b85c38;
  --sidebar-glow: rgba(184,92,56,0.22);
  --orb1:         rgba(184,92,56,0.09);
  --orb2:         rgba(184,92,56,0.05);
  --shadow:       rgba(0,0,0,0.15);
  --accent:       #b85c38;
  --accent-dim:   #9a4a2d;
  --accent-glow:  rgba(184,92,56,0.10);
  --user-bg:      #1e1a16;
  --user-border:  rgba(184,92,56,0.18);
  --radius:       12px;
  --font-mono:    'DM Mono', monospace;
  --font-sans:    'Plus Jakarta Sans', system-ui, sans-serif;
}

/* ── LIGHT THEME ── */
[data-theme="light"] {
  --bg:           #f0f0f0;
  --bg-side:      #ffffff;
  --surface:      #ffffff;
  --surface2:     #e8e8e8;
  --border:       rgba(0,0,0,0.08);
  --border-md:    rgba(0,0,0,0.13);
  --text:         #1a1a1a;
  --text-muted:   #666666;
  --text-dim:     #aaaaaa;
  --input-bg:     #ffffff;
  --pill-bg:      rgba(184,92,56,0.08);
  --pill-border:  rgba(184,92,56,0.22);
  --pill-text:    #9e3f1a;
  --pill2-bg:     rgba(0,0,0,0.04);
  --pill2-border: rgba(0,0,0,0.1);
  --pill2-text:   #888888;
  --topbar-bg:    rgba(240,240,240,0.92);
  --btn-ghost-bg: rgba(0,0,0,0.05);
  --btn-ghost-bd: rgba(0,0,0,0.14);
  --hero-h:       #111820;
  --hero-em:      #b85c38;
  --sidebar-glow: rgba(184,92,56,0.15);
  --orb1:         rgba(184,92,56,0.06);
  --orb2:         rgba(184,92,56,0.03);
  --shadow:       rgba(0,0,0,0.08);
  --accent:       #b85c38;
  --accent-dim:   #9e3f1a;
  --accent-glow:  rgba(184,92,56,0.08);
  --user-bg:      #f5ede8;
  --user-border:  rgba(184,92,56,0.15);
  --radius:       12px;
  --font-mono:    'DM Mono', monospace;
  --font-sans:    'Plus Jakarta Sans', system-ui, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  transition: background 0.25s, color 0.25s;
}

/* ── Layout: Sidebar + Main ── */
.app {
  display: flex;
  height: 100dvh;
  overflow: hidden;
}

/* ── Sidebar ── */
.sidebar {
  width: 258px;
  background: var(--bg-side);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 22px 14px 18px;
  flex-shrink: 0;
  position: relative;
  transition: background 0.25s;
}

.sidebar::after {
  content: '';
  position: absolute;
  top: 15%;
  right: 0;
  bottom: 15%;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--sidebar-glow), transparent);
}

/* Logo block */
.logo-block {
  padding: 2px 8px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.logo-product {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
  text-decoration: none;
  display: block;
}

a.logo-product:hover {
  opacity: 0.85;
}

.logo-parent {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 5px;
}

.logo-parent-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* New chat button */
.btn-new {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border-radius: 8px;
  background: transparent;
  border: 1px solid var(--border-md);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  width: 100%;
  text-align: left;
  margin-bottom: 4px;
}

.btn-new:hover {
  background: var(--surface2);
  color: var(--text);
}

.btn-new svg {
  opacity: 0.5;
  flex-shrink: 0;
}

/* Nav section (conversation list) */
.nav-section {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 4px;
}

.convo-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border-radius: 7px;
  color: var(--text-muted);
  font-size: 13.5px;
  cursor: pointer;
  transition: all 0.14s;
  text-decoration: none;
  flex-shrink: 0;
}

.convo-item:hover {
  background: var(--surface2);
  color: var(--text);
}

.convo-item.active {
  background: var(--surface2);
  color: var(--text);
}

.convo-item svg {
  flex-shrink: 0;
  opacity: 0.5;
}

.convo-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.convo-meta {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.convo-delete {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.7rem;
  opacity: 0;
  transition: all 0.2s;
  flex-shrink: 0;
}

.convo-item:hover .convo-delete {
  opacity: 1;
}

.convo-delete:hover {
  color: #e08080;
}

.convo-empty {
  font-size: 0.78rem;
  color: var(--text-dim);
  padding: 12px 8px;
  text-align: center;
}

/* Sidebar footer */
.sidebar-footer {
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 7px;
  flex-shrink: 0;
}

.footer-note {
  padding: 2px 4px 2px;
  line-height: 1.5;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #b85c38;
  display: block;
  margin-bottom: 5px;
}

.footer-body {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

.pills {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pill {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 9px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  border: 1px solid transparent;
  transition: all 0.15s;
}

.pill-a {
  background: var(--pill-bg);
  border-color: var(--pill-border);
  color: var(--pill-text);
}

/* Sidebar user info */
.sidebar-user {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
}

.sidebar-user .user-email {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-user .user-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tier-badge {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
}

.tier-badge.tier-free {
  color: var(--text-muted);
  background: var(--surface2);
  border: 1px solid var(--border);
}

.tier-badge.tier-paid {
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
}

.upgrade-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
  padding: 4px 12px;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: all 0.2s ease;
}

.upgrade-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.sign-out-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sign-out-btn:hover {
  color: var(--text-muted);
  border-color: var(--text-dim);
}

/* ── Main Content Area ── */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  background: var(--bg);
  transition: background 0.25s;
}

/* Background orbs */
.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}

.orb1 {
  width: 520px;
  height: 400px;
  background: radial-gradient(circle, var(--orb1) 0%, transparent 70%);
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
}

.orb2 {
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, var(--orb2) 0%, transparent 70%);
  bottom: 60px;
  right: 8%;
}

/* ── Topbar ── */
.topbar {
  position: relative;
  z-index: 10;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 20px;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  background: var(--topbar-bg);
  backdrop-filter: blur(12px);
  transition: background 0.25s;
  flex-shrink: 0;
}

/* Topbar nav links */
.topbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-right: auto;
}

.topbar-link {
  padding: 5px 12px;
  border-radius: 7px;
  color: var(--text-muted);
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.14s;
}

.topbar-link:hover {
  background: var(--surface2);
  color: var(--text);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  background: var(--surface2);
  border: 1px solid var(--border-md);
  border-radius: 20px;
  padding: 3px;
  margin-right: 6px;
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.18s;
}

.theme-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 4px var(--shadow);
}

.topbar-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.gh-stats {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 8px;
}

.gh-stat {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color 0.2s ease;
}

.gh-stat:hover {
  color: var(--accent);
}

.gh-stat svg {
  width: 13px;
  height: 13px;
  fill: currentColor;
}

.github-link {
  color: var(--text-dim);
  transition: color 0.2s ease;
  display: flex;
  align-items: center;
}

.github-link:hover {
  color: var(--accent);
}

.github-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ── Inner content wrapper (scrollable area below topbar) ── */
.main-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  z-index: 1;
}

/* ── Model Selector ── */
.model-selector {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: safe center;
  padding: 40px 24px;
  gap: 32px;
  animation: fadeUp 0.6s ease;
  overflow-y: auto;
}

.model-selector::-webkit-scrollbar { width: 6px; background: transparent; }
.model-selector::-webkit-scrollbar-thumb { background: transparent; border-radius: 4px; }
.model-selector:hover::-webkit-scrollbar-thumb { background: var(--border); }

.model-selector h2 {
  font-family: var(--font-sans);
  font-size: clamp(1.5rem, 3.8vw, 1.8rem);
  font-weight: 300;
  text-align: center;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--hero-h);
}

.model-selector h2 em {
  color: var(--hero-em);
  font-style: normal;
  font-weight: 600;
}

.model-selector p {
  color: var(--text-muted);
  text-align: center;
  max-width: 480px;
  line-height: 1.6;
  font-size: 0.92rem;
}

/* ── Model Grid ── */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  width: 100%;
  max-width: 580px;
}

.model-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.model-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.model-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.model-card:hover::before { opacity: 1; }
.model-card.selected { border-color: var(--accent); background: var(--user-bg); }
.model-card.cached { border-style: dashed; border-color: var(--accent-dim); }

.model-card.active-model {
  border-color: var(--accent);
  border-style: solid;
  background: var(--user-bg);
  box-shadow: 0 0 16px var(--accent-glow), inset 0 0 16px var(--accent-glow);
}

.model-card.active-model::before { opacity: 1; }
.model-card.device-incompatible { opacity: 0.4; cursor: not-allowed; }

.model-card h3 {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
  position: relative;
}

.model-card .model-desc { font-size: 0.78rem; color: var(--text-muted); line-height: 1.4; position: relative; }
.model-card .model-tech { font-family: var(--font-mono); font-size: 0.62rem; color: var(--text-dim); margin-top: 6px; position: relative; letter-spacing: 0.02em; }
.model-card .model-size { font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent-dim); margin-top: 8px; position: relative; }
.model-card .model-time { font-size: 0.72rem; color: var(--text-dim); margin-top: 4px; position: relative; }
.model-card .model-memory-note { font-size: 0.7rem; margin-top: 6px; color: #d0a070; position: relative; }

/* Model badges */
.model-badge { position: absolute; top: 10px; right: 12px; font-family: var(--font-mono); font-size: 0.58rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; padding: 2px 8px; border-radius: 100px; z-index: 1; }
.cached-label { position: absolute; bottom: 10px; right: 12px; font-family: var(--font-mono); font-size: 0.52rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-dim); opacity: 0.7; z-index: 1; cursor: pointer; transition: all 0.2s ease; }
.cached-label:hover { color: #e08080; opacity: 1; }
.tiny-label, .long-load-label, .goldilocks-label { font-family: var(--font-mono); font-size: 0.55rem; border-radius: 100px; padding: 1px 7px; margin-left: 6px; vertical-align: middle; letter-spacing: 0.06em; text-transform: uppercase; font-weight: 500; }
.tiny-label { color: #b0a0d0; background: rgba(176,160,208,0.1); border: 1px solid rgba(176,160,208,0.2); }
.long-load-label { color: #d0a070; background: rgba(208,160,112,0.1); border: 1px solid rgba(208,160,112,0.2); }
.goldilocks-label { color: var(--accent); background: rgba(184,92,56,0.1); border: 1px solid rgba(184,92,56,0.2); }
.desktop-only-badge, .memory-warning-badge { font-family: var(--font-mono); font-size: 0.52rem; border-radius: 100px; padding: 2px 8px; margin-left: 6px; vertical-align: middle; letter-spacing: 0.06em; text-transform: uppercase; font-weight: 500; }
.desktop-only-badge { color: #e08080; background: rgba(224,128,128,0.1); border: 1px solid rgba(224,128,128,0.2); }
.memory-warning-badge { color: #d0a070; background: rgba(208,160,112,0.1); border: 1px solid rgba(208,160,112,0.2); }

/* ── Download Notice ── */
.download-notice { max-width: 520px; text-align: center; display: flex; flex-direction: column; gap: 8px; }
.download-notice .notice-main { font-size: 0.82rem; color: var(--text-muted); line-height: 1.5; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 20px; }
.download-notice .notice-main svg { width: 14px; height: 14px; fill: var(--accent-dim); vertical-align: -2px; margin-right: 4px; }
.download-notice .notice-detail { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); letter-spacing: 0.03em; }

/* ── Load Button ── */
.load-btn { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 500; background: var(--accent); color: #fff; border: none; border-radius: 100px; padding: 14px 40px; cursor: pointer; letter-spacing: 0.04em; text-transform: uppercase; transition: all 0.2s ease; }
.load-btn:hover { background: #d4724e; transform: translateY(-1px); }
.load-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* ── Storage Section ── */
.storage-toggle-link { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim); letter-spacing: 0.03em; cursor: pointer; text-decoration: none; transition: color 0.2s ease; }
.storage-toggle-link:hover { color: var(--accent); }
.storage-section { display: none; width: 100%; max-width: 520px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; }
.storage-section.active { display: block; }
.storage-section h4 { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.storage-summary { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); margin-bottom: 12px; }
.storage-model-row { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--border); }
.storage-model-row .model-name { font-size: 0.78rem; color: var(--text-muted); }
.storage-model-row .model-actions { display: flex; align-items: center; gap: 8px; }
.storage-clear-btn { font-family: var(--font-mono); font-size: 0.62rem; color: #e08080; background: transparent; border: 1px solid rgba(224,128,128,0.3); border-radius: 6px; padding: 3px 10px; cursor: pointer; transition: all 0.2s; }
.storage-clear-btn:hover { background: rgba(224,128,128,0.1); border-color: #e08080; }
.storage-clear-all-btn { width: 100%; margin-top: 12px; font-family: var(--font-mono); font-size: 0.68rem; color: #e08080; background: rgba(224,128,128,0.05); border: 1px solid rgba(224,128,128,0.2); border-radius: 8px; padding: 8px; cursor: pointer; transition: all 0.2s; }
.storage-clear-all-btn:hover { background: rgba(224,128,128,0.1); border-color: #e08080; }

/* ── Device Banners ── */
.device-info-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
}

.device-info-bar .info-sep { color: var(--border-md); }
.device-info-bar .info-ok { color: var(--accent); }
.device-info-bar .info-warn { color: #d0a070; }

.iphone-unsupported-banner {
  background: var(--surface);
  border: 1px solid var(--border-md);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 520px;
}

.iphone-unsupported-banner strong { color: var(--text); font-size: 0.95rem; }

.webgpu-warning,
.browser-version-warning {
  background: rgba(184,92,56,0.06);
  border: 1px solid rgba(184,92,56,0.2);
  border-radius: var(--radius);
  padding: 16px 20px;
  max-width: 480px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.browser-version-warning {
  background: rgba(184,92,56,0.04);
  border-color: rgba(184,92,56,0.15);
}

.browser-version-warning code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
}

.network-error {
  background: rgba(184,92,56,0.06);
  border: 1px solid rgba(184,92,56,0.2);
  border-radius: var(--radius);
  padding: 20px 24px;
  max-width: 520px;
  text-align: left;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.network-error strong { display: block; margin-bottom: 8px; font-size: 0.9rem; color: var(--text); }
.network-error code { font-family: var(--font-mono); font-size: 0.72rem; background: rgba(255, 255, 255, 0.06); padding: 2px 6px; border-radius: 4px; }
.network-error ul { margin: 8px 0; padding-left: 18px; }
.network-error li { margin: 4px 0; }

/* ── Loading Screen ── */
.loading-screen {
  display: none;
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px 24px;
  animation: fadeUp 0.6s ease;
}

.loading-screen.active {
  display: flex;
}

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

.loader-ring {
  width: 48px;
  height: 48px;
  border: 2px solid var(--border-md);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-model-name { font-family: var(--font-sans); font-weight: 600; font-size: 1.2rem; color: var(--text-muted); }
.loading-label { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); letter-spacing: 0.02em; }
.progress-bar-container { width: 300px; height: 4px; background: var(--surface); border-radius: 2px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--accent); width: 0%; border-radius: 2px; transition: width 0.3s ease; }

.loading-phases { display: flex; gap: 24px; margin-top: 4px; }
.phase { display: flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.03em; }
.phase.active { color: var(--accent); }
.phase.done { color: var(--accent-dim); }

.phase-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--border-md); flex-shrink: 0; }
.phase.active .phase-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); animation: pulse 1.5s ease infinite; }
.phase.done .phase-dot { background: var(--accent-dim); }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.loading-stats { display: flex; gap: 20px; font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.03em; }

.loading-tip {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-align: center;
  max-width: 380px;
  line-height: 1.5;
  margin-top: 8px;
  transition: opacity 0.3s ease;
}

/* ── Chat Container ── */
.chat-container {
  display: none;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.chat-container.active {
  display: flex;
}

/* ── Settings Panel ── */
.settings-panel { display: none; border-bottom: 1px solid var(--border); padding: 16px 24px; max-height: 300px; overflow-y: auto; }
.settings-panel.active { display: block; }
.settings-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.settings-section h4 { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; color: var(--text-muted); margin-bottom: 8px; letter-spacing: 0.04em; text-transform: uppercase; }
.settings-field { margin-bottom: 10px; }
.settings-field label { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted); margin-bottom: 4px; }
.settings-field .val { color: var(--accent); }
.settings-field input[type="range"] { width: 100%; accent-color: var(--accent); }
.preset-select { width: 100%; background: var(--surface); color: var(--text-muted); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; font-family: var(--font-mono); font-size: 0.72rem; margin-bottom: 8px; outline: none; }
.system-prompt-input { width: 100%; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; font-family: var(--font-sans); font-size: 0.82rem; resize: vertical; outline: none; }
.system-prompt-input:focus { border-color: var(--accent-dim); }

/* ── Knowledge Base ── */
.kb-section { grid-column: span 1; }
.kb-header { display: flex; justify-content: space-between; align-items: center; }
.kb-toggle { position: relative; display: inline-block; width: 32px; height: 18px; }
.kb-toggle input { opacity: 0; width: 0; height: 0; }
.kb-toggle-slider { position: absolute; cursor: pointer; inset: 0; background: var(--border); border-radius: 18px; transition: 0.3s; }
.kb-toggle-slider::before { content: ""; position: absolute; width: 14px; height: 14px; left: 2px; bottom: 2px; background: var(--text-muted); border-radius: 50%; transition: 0.3s; }
.kb-toggle input:checked + .kb-toggle-slider { background: var(--accent-dim); }
.kb-toggle input:checked + .kb-toggle-slider::before { transform: translateX(14px); background: var(--accent); }
.kb-model-status { display: flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); margin: 6px 0; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--border); flex-shrink: 0; }
.status-dot.loaded { background: var(--accent); }
.status-dot.loading { background: var(--accent-dim); animation: pulse 1s ease infinite; }
.kb-load-btn { font-family: var(--font-mono); font-size: 0.6rem; color: var(--accent); background: transparent; border: 1px solid var(--accent-dim); border-radius: 6px; padding: 2px 8px; cursor: pointer; }
.kb-actions { display: flex; gap: 6px; margin: 6px 0; }
.kb-upload-btn, .kb-clear-btn { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-muted); background: var(--surface); border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px; cursor: pointer; transition: all 0.2s; }
.kb-upload-btn:hover { border-color: var(--accent-dim); color: var(--accent); }
.kb-clear-btn { color: #e08080; border-color: rgba(224,128,128,0.3); }
.kb-clear-btn:hover { border-color: #e08080; }
.kb-docs { margin-top: 4px; }
.kb-empty { font-size: 0.7rem; color: var(--text-dim); font-style: italic; }
.kb-doc-item { display: flex; align-items: center; gap: 6px; padding: 4px 0; border-bottom: 1px solid var(--border); }
.kb-doc-item .doc-name { font-size: 0.72rem; color: var(--text-muted); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-doc-item .doc-meta { font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-dim); white-space: nowrap; }
.kb-doc-item .doc-remove { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 0.9rem; transition: color 0.2s; }
.kb-doc-item .doc-remove:hover { color: #e08080; }
.kb-rag-indicator { font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent-dim); text-align: center; padding: 4px 8px; letter-spacing: 0.03em; }

/* ── KB Loading Overlay ── */
.kb-loading-overlay { position: fixed; inset: 0; background: rgba(12,12,17,0.92); display: none; flex-direction: column; align-items: center; justify-content: center; gap: 12px; z-index: 100; }
.kb-loading-overlay.active { display: flex; }
.kb-loading-title { font-family: var(--font-sans); font-weight: 300; font-size: 1.1rem; color: var(--text); }
.kb-loading-subtitle { font-size: 0.82rem; color: var(--text-muted); text-align: center; max-width: 400px; }
.kb-loading-bar { width: 280px; height: 4px; background: var(--surface); border-radius: 2px; overflow: hidden; }
.kb-loading-bar-fill { height: 100%; background: var(--accent); width: 0%; border-radius: 2px; transition: width 0.3s ease; }
.kb-loading-text { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim); }

/* ── Messages ── */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

.messages::-webkit-scrollbar { width: 6px; background: transparent; }
.messages::-webkit-scrollbar-track { background: transparent; }
.messages::-webkit-scrollbar-thumb { background: transparent; border-radius: 4px; transition: background 0.2s; }
.messages:hover::-webkit-scrollbar-thumb { background: var(--border-md); }

.message {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.88rem;
  line-height: 1.65;
  max-width: 85%;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.message.system {
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  background: transparent;
  padding: 8px;
  letter-spacing: 0.03em;
}

.message.user {
  align-self: flex-end;
  background: var(--user-bg);
  border: 1px solid var(--user-border);
  color: var(--text);
}

.message.assistant {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}

.message.file-context {
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-dim);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 14px;
  letter-spacing: 0.02em;
}

/* ── Markdown in assistant messages ── */
.message.assistant.rendered h1,
.message.assistant.rendered h2,
.message.assistant.rendered h3,
.message.assistant.rendered h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  margin: 16px 0 8px;
  color: var(--text);
}

.message.assistant.rendered h1 { font-size: 1.3rem; }
.message.assistant.rendered h2 { font-size: 1.1rem; }
.message.assistant.rendered h3 { font-size: 1rem; }
.message.assistant.rendered p { margin: 8px 0; }
.message.assistant.rendered ul, .message.assistant.rendered ol { padding-left: 20px; margin: 8px 0; }
.message.assistant.rendered li { margin: 4px 0; }

.message.assistant.rendered code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
}

.message.assistant.rendered pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 12px 0;
}

.message.assistant.rendered pre code { background: transparent; padding: 0; font-size: 0.8rem; line-height: 1.5; }
.message.assistant.rendered blockquote { border-left: 3px solid var(--accent-dim); padding-left: 14px; margin: 12px 0; color: var(--text-muted); }
.message.assistant.rendered table { border-collapse: collapse; margin: 12px 0; width: 100%; }
.message.assistant.rendered th, .message.assistant.rendered td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; font-size: 0.82rem; }
.message.assistant.rendered th { background: var(--surface2); font-weight: 500; }
.message.assistant.rendered hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.message.assistant.rendered a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.message-image { max-width: 200px; max-height: 200px; border-radius: 8px; margin-top: 6px; display: block; }

/* ── Input Area ── */
.input-area {
  border-top: 1px solid var(--border);
  padding: 14px 24px 20px;
  flex-shrink: 0;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

.attachment-preview { display: none; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.attachment-preview.active { display: flex; }

.attachment-thumb {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.attachment-thumb img { width: 32px; height: 32px; object-fit: cover; border-radius: 4px; }
.attachment-thumb .remove-attach { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 1rem; line-height: 1; transition: color 0.2s; }
.attachment-thumb .remove-attach:hover { color: #e05050; }

.input-row { display: flex; align-items: flex-end; gap: 8px; }

.input-wrapper {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--border-md);
  border-radius: var(--radius);
  padding: 0 14px;
  transition: border-color 0.2s;
}

.input-wrapper:focus-within {
  border-color: rgba(184,92,56,0.45);
  box-shadow: 0 0 0 3px rgba(184,92,56,0.1);
}

.input-wrapper textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  resize: none;
  outline: none;
  padding: 12px 0;
  line-height: 1.5;
  max-height: 150px;
  caret-color: #b85c38;
}

.file-btn,
.send-btn,
.stop-btn {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-md);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.file-btn:hover,
.send-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.send-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.send-btn svg, .stop-btn svg, .file-btn svg { width: 18px; height: 18px; fill: currentColor; }

.stop-btn { display: none; border-color: #e05050; color: #e05050; }
.stop-btn.active { display: flex; }
.stop-btn:hover { background: rgba(224, 80, 80, 0.1); }

.multimodal-btns { display: none; }
.multimodal-btns.active { display: flex; gap: 4px; }
.mm-btn { flex-shrink: 0; width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border-md); background: var(--surface); color: var(--text-muted); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; }
.mm-btn:hover { border-color: var(--accent); color: var(--accent); }
.mm-btn svg { width: 18px; height: 18px; fill: currentColor; }

.input-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; }
.input-meta-left { display: flex; align-items: center; gap: 8px; }
.input-meta-left span { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); letter-spacing: 0.02em; }

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid transparent;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: all 0.2s;
}

.toolbar-btn:hover { color: var(--text-muted); border-color: var(--border); background: var(--surface); }
.toolbar-btn.active { color: var(--accent); border-color: var(--accent-dim); }
.toolbar-btn svg { width: 14px; height: 14px; fill: currentColor; }

.input-meta-right { display: flex; align-items: center; gap: 10px; }
.input-meta-right span { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); letter-spacing: 0.02em; }

.token-bar { display: flex; align-items: center; gap: 8px; }
.token-bar-track { width: 60px; height: 3px; background: var(--surface2); border-radius: 2px; overflow: hidden; }
.token-bar-fill { height: 100%; background: var(--accent-dim); width: 0%; border-radius: 2px; transition: width 0.3s ease; }
.token-bar-fill.warn { background: #d0a070; }
.token-bar-fill.danger { background: #e05050; }

/* ── File Drop Overlay ── */
.file-drop-overlay { position: absolute; inset: 0; background: rgba(12,12,17,0.9); display: none; flex-direction: column; align-items: center; justify-content: center; gap: 12px; z-index: 20; border: 2px dashed var(--accent-dim); border-radius: var(--radius); }
.file-drop-overlay.active { display: flex; }
.file-drop-overlay svg { width: 36px; height: 36px; fill: var(--accent-dim); }
.file-drop-overlay span { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent-dim); letter-spacing: 0.03em; }

/* ── Architecture Section ── */
.arch-link { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim); letter-spacing: 0.03em; text-decoration: none; transition: color 0.2s ease; }
.arch-link:hover { color: var(--accent); }
.arch-section { width: 100%; max-width: 900px; margin-top: 8px; padding-top: 32px; border-top: 1px solid var(--border); }
.arch-section h3 { font-family: var(--font-sans); font-size: 1.3rem; font-weight: 300; color: var(--text); margin-bottom: 20px; text-align: center; letter-spacing: -0.01em; }
.arch-columns { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.arch-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.arch-card h4 { font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500; color: var(--accent); margin-bottom: 12px; letter-spacing: 0.03em; }
.arch-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; text-align: left; margin-bottom: 12px; }
.arch-card .arch-label { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-dim); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 4px; }
.arch-flow { display: flex; flex-direction: column; align-items: center; margin-bottom: 20px; padding: 16px 12px; background: var(--bg); border-radius: 10px; border: 1px solid var(--border); }
.arch-flow-step { width: 100%; background: var(--surface2); border: 1px solid var(--border); border-radius: 8px; padding: 9px 12px; text-align: center; font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-muted); letter-spacing: 0.02em; line-height: 1.4; }
.arch-flow-step .step-sub { display: block; font-size: 0.58rem; color: var(--text-dim); font-weight: 300; margin-top: 2px; }
.arch-flow-step.highlight { border-color: var(--accent-dim); background: rgba(184,92,56,0.04); color: var(--accent); }
.arch-flow-step.highlight .step-sub { color: var(--accent-dim); }
.arch-flow-step.step-end { background: transparent; border-style: dashed; color: var(--text-dim); }
.arch-flow-step.step-fork { display: flex; justify-content: center; gap: 6px; background: transparent; border: none; padding: 0; }
.arch-flow-step.step-fork .fork-option { flex: 1; background: var(--surface2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 6px; font-family: var(--font-mono); font-size: 0.62rem; color: var(--text-muted); text-align: center; }
.arch-flow-step.step-fork .fork-primary { border-color: var(--accent-dim); color: var(--accent-dim); }
.arch-flow-arrow { display: flex; align-items: center; justify-content: center; padding: 4px 0; color: var(--border); }
.arch-flow-arrow svg { width: 12px; height: 18px; }
.arch-shared { margin-top: 16px; text-align: center; font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); letter-spacing: 0.03em; line-height: 1.6; }

/* ── Tier Locked ── */
.tier-locked { opacity: 0.4; pointer-events: none; position: relative; }
.tier-locked::after { content: "PRO"; position: absolute; top: 8px; right: 8px; font-family: var(--font-mono); font-size: 0.55rem; color: var(--accent); background: var(--surface2); border: 1px solid var(--accent-dim); border-radius: 100px; padding: 2px 8px; letter-spacing: 0.06em; }

/* ── Mobile sidebar toggle ── */
.sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border-md);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  margin-right: auto;
}

.sidebar-toggle:hover {
  background: var(--surface2);
  color: var(--text);
}

.sidebar-toggle svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .arch-columns { grid-template-columns: 1fr 1fr; }
  .settings-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    bottom: 0;
    z-index: 100;
    transition: left 0.25s ease;
    box-shadow: none;
  }

  .sidebar.open {
    left: 0;
    box-shadow: 4px 0 24px var(--shadow);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
  }

  .sidebar-overlay.active {
    display: block;
  }

  .sidebar-toggle {
    display: flex;
  }

  .topbar {
    padding: 0 12px;
  }

  .gh-stats {
    display: none;
  }

  .messages {
    padding: 16px;
  }

  .input-area {
    padding: 12px 16px 20px;
  }

  .message {
    max-width: 92%;
  }

  .device-info-bar {
    font-size: 0.6rem;
    gap: 6px;
    padding: 6px 12px;
  }

  .model-selector h2 {
    font-size: 1.5rem;
  }

  .model-grid {
    grid-template-columns: 1fr;
  }

  .settings-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .theme-toggle {
    display: none;
  }

  .arch-columns {
    grid-template-columns: 1fr;
  }
}