/* =========================================================================
   NoTube.ai — design system
   ========================================================================= */
:root {
  --brand-1: #a78bfa;
  --brand-2: #6366f1;
  --brand-grad: linear-gradient(135deg, var(--brand-1) 0%, var(--brand-2) 100%);

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --sidebar-w: 280px;
}

/* Dark theme (default) */
html[data-theme="dark"] {
  --bg: #0b0b0f;
  --bg-elev: #121218;
  --bg-elev-2: #17171f;
  --panel: #101017;
  --panel-hover: #1a1a22;
  --border: #23232d;
  --border-strong: #2e2e3a;
  --text: #ececf1;
  --text-2: #b4b4c2;
  --text-3: #7a7a8a;
  --accent: #a78bfa;
  --accent-hover: #8b5cf6;
  --accent-soft: rgba(167, 139, 250, 0.12);
  --danger: #f87171;
  --success: #4ade80;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.35);
  --shadow-lg: 0 24px 60px rgba(0,0,0,0.55);
}

html[data-theme="light"] {
  --bg: #ffffff;
  --bg-elev: #fafafb;
  --bg-elev-2: #f4f4f7;
  --panel: #f7f7fa;
  --panel-hover: #eeeef3;
  --border: #e5e5ea;
  --border-strong: #d4d4dc;
  --text: #1a1a22;
  --text-2: #4b4b5b;
  --text-3: #8a8a9a;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-soft: rgba(99, 102, 241, 0.1);
  --danger: #dc2626;
  --success: #16a34a;
  --shadow-sm: 0 1px 2px rgba(10,10,20,0.05);
  --shadow-md: 0 8px 24px rgba(10,10,20,0.08);
  --shadow-lg: 0 24px 60px rgba(10,10,20,0.12);
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: var(--accent-soft); color: var(--text); }

.muted { color: var(--text-3); }
.small { font-size: 13px; }

/* =========================================================================
   App shell
   ========================================================================= */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
}
.app-shell.sidebar-collapsed {
  grid-template-columns: 0 1fr;
}
.app-shell.sidebar-collapsed .sidebar { transform: translateX(-100%); opacity: 0; pointer-events: none; }
/* When the sidebar is collapsed on desktop, show the hamburger so user can re-open */
.app-shell.sidebar-collapsed .header-menu { display: inline-flex; }

/* Real backdrop element (instead of ::after) for consistent Firefox rendering */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms;
}
.app-shell.sidebar-open .sidebar-backdrop {
  opacity: 1;
  pointer-events: auto;
}

/* =========================================================================
   Sidebar
   ========================================================================= */
.sidebar {
  grid-row: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  overflow: hidden;
  transition: transform 220ms cubic-bezier(.2,.8,.2,1), opacity 150ms;
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 14px 10px 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand-mark { width: 26px; height: 26px; flex-shrink: 0; }
.brand-text { line-height: 1; }
.brand-dot { color: var(--accent); }

.sidebar-actions {
  display: flex;
  gap: 6px;
  padding: 4px 12px 10px 12px;
}
.btn-new {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 500;
  transition: all 150ms;
}
.btn-new:hover { background: var(--panel-hover); border-color: var(--border-strong); }
.btn-models {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-2);
  transition: all 150ms;
}
.btn-models:hover { background: var(--panel-hover); color: var(--text); }

.sidebar-search {
  position: relative;
  padding: 0 12px 10px 12px;
}
.sidebar-search svg {
  position: absolute;
  left: 22px; top: 50%;
  transform: translateY(calc(-50% - 5px));
  color: var(--text-3);
  pointer-events: none;
}
.sidebar-search input {
  width: 100%;
  padding: 8px 10px 8px 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color 150ms, background 150ms;
}
.sidebar-search input:focus { border-color: var(--accent); background: var(--bg-elev-2); }

/* Conversation list */
.convo-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 16px 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.convo-scroll::-webkit-scrollbar { width: 8px; }
.convo-scroll::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }

.convo-section { margin-bottom: 12px; }
.convo-section-label {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 8px 6px 8px;
  color: var(--text-3);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.convo-list { list-style: none; margin: 0; padding: 0; }
.convo-item {
  position: relative;
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: background 120ms;
}
.convo-item:hover { background: var(--panel-hover); }
.convo-item.active { background: var(--accent-soft); }
.convo-item.active .convo-title { color: var(--text); }
.convo-link {
  flex: 1;
  min-width: 0;
  padding: 8px 10px;
  display: block;
}
.convo-title {
  display: block;
  font-size: 14px;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.convo-menu-btn {
  opacity: 0;
  margin-right: 4px;
  width: 26px; height: 26px;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 0;
  color: var(--text-3);
  border-radius: var(--radius-xs);
  transition: opacity 120ms, color 120ms, background 120ms;
}
.convo-item:hover .convo-menu-btn,
.convo-menu-btn[aria-expanded="true"] { opacity: 1; }
.convo-menu-btn:hover { background: var(--bg-elev-2); color: var(--text); }

.convo-empty {
  padding: 40px 16px;
  text-align: center;
  color: var(--text-3);
  font-size: 13px;
}
.convo-empty p { margin: 0 0 4px 0; }

/* Sidebar foot */
.sidebar-foot {
  border-top: 1px solid var(--border);
  padding: 12px 12px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.user-chip {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.user-avatar {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--brand-grad);
  color: #fff;
  border-radius: 50%;
  font-weight: 600;
  font-size: 14px;
}
.user-info { flex: 1; min-width: 0; }
.user-email {
  font-size: 13px; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.user-meta { font-size: 11px; color: var(--text-3); }

.privacy-card {
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.privacy-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 999px;
  font-size: 11px; font-weight: 600;
  margin-bottom: 8px;
}
.privacy-card p { margin: 0 0 10px 0; font-size: 12px; color: var(--text-2); line-height: 1.5; }
.privacy-actions { display: flex; gap: 6px; }

.sidebar-foot-links {
  display: flex; gap: 8px;
  padding: 0 4px;
  font-size: 12px; color: var(--text-3);
  justify-content: center;
}
.sidebar-foot-links span { color: var(--text-3); }

.link-btn {
  background: transparent;
  border: 0;
  color: var(--text-3);
  font-size: 12px;
  font-family: inherit;
  padding: 0;
  transition: color 150ms;
  text-decoration: none;
}
.link-btn:hover { color: var(--text); }
.link-accent { color: var(--accent); text-decoration: none; font-weight: 500; }
.link-accent:hover { color: var(--accent-hover); text-decoration: underline; }

/* =========================================================================
   Main chat area
   ========================================================================= */
.chat-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
}

/* Header */
.chat-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
  min-height: 56px;
}
.header-menu { display: none; }

/* Brand shown in the chat header on mobile only — the sidebar logo is hidden
   when the drawer is closed, so without this the chat page has no branding
   anywhere on small screens. */
.chat-brand { display: none; align-items: center; gap: 8px; text-decoration: none; color: var(--text); }
.chat-brand-mark { width: 22px; height: 22px; flex-shrink: 0; }
.chat-brand-text { font-weight: 700; letter-spacing: -0.01em; font-size: 15px; }
.chat-brand-dot { color: var(--accent); }

.model-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  transition: all 150ms;
}
.model-pill:hover { background: var(--panel-hover); border-color: var(--border-strong); }
.model-pill-provider {
  padding: 2px 7px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  text-transform: capitalize;
}
.model-pill-name { color: var(--text); }

.chat-title-wrap { flex: 1; min-width: 0; padding: 0 8px; }
.chat-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  display: block;
  cursor: text;
  padding: 2px 4px;
  border-radius: var(--radius-xs);
}
.chat-title:hover { background: var(--panel-hover); color: var(--text); }
.chat-title[contenteditable="true"] { background: var(--bg-elev-2); color: var(--text); outline: 1px solid var(--accent); }

.header-actions { display: flex; gap: 4px; }

/* Icon button */
.icon-btn {
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  transition: all 150ms;
}
.icon-btn:hover { background: var(--panel-hover); color: var(--text); }

/* =========================================================================
   Messages
   ========================================================================= */
.messages-area {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.messages-area::-webkit-scrollbar { width: 10px; }
.messages-area::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 5px; }

.messages-scroll {
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 24px 40px 24px;
}

.msg {
  display: flex;
  gap: 14px;
  margin-bottom: 28px;
}
.msg-avatar {
  width: 30px; height: 30px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  margin-top: 2px;
}
.msg-avatar svg { width: 30px; height: 30px; display: block; }

.msg-body { flex: 1; min-width: 0; }
.msg-content {
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--text);
  word-wrap: break-word;
  overflow-wrap: break-word;
}
.msg-user .msg-content {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  max-width: 100%;
  white-space: pre-wrap;
}
.msg-user { justify-content: flex-end; }
.msg-user .msg-body { max-width: 70%; }

/* User-uploaded images inside a message */
.msg-images { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.msg-images img {
  max-width: 240px;
  max-height: 240px;
  border-radius: 8px;
  border: 1px solid var(--border);
  object-fit: cover;
}

/* Composer attach preview chips (shown above the textarea before send) */
.attach-preview {
  display: flex;
  gap: 8px;
  padding: 8px 14px 0 14px;
  flex-wrap: wrap;
}
.attach-chip {
  position: relative;
  width: 60px; height: 60px;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-elev);
}
.attach-chip img { width: 100%; height: 100%; object-fit: cover; }
.attach-chip-remove {
  position: absolute; top: 2px; right: 2px;
  width: 18px; height: 18px;
  border: none; border-radius: 50%;
  background: rgba(0,0,0,0.6); color: #fff;
  font-size: 14px; line-height: 1;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.attach-chip-remove:hover { background: rgba(0,0,0,0.8); }

/* Markdown rendering */
.msg-content p { margin: 0 0 12px 0; }
.msg-content p:last-child { margin-bottom: 0; }
.msg-content h1, .msg-content h2, .msg-content h3, .msg-content h4 {
  margin: 18px 0 10px 0; font-weight: 600; letter-spacing: -0.01em;
}
.msg-content h1 { font-size: 22px; }
.msg-content h2 { font-size: 19px; }
.msg-content h3 { font-size: 17px; }
.msg-content h4 { font-size: 15px; }
.msg-content ul, .msg-content ol { margin: 0 0 12px 0; padding-left: 24px; }
.msg-content li { margin-bottom: 4px; }
.msg-content a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.msg-content a:hover { color: var(--accent-hover); }
.msg-content strong { font-weight: 600; }
.msg-content em { font-style: italic; }
.msg-content blockquote {
  margin: 0 0 12px 0;
  padding: 8px 14px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-2);
}
.msg-content hr { border: 0; border-top: 1px solid var(--border); margin: 18px 0; }
.msg-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 12px 0;
  font-size: 14px;
}
.msg-content th, .msg-content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.msg-content th { background: var(--bg-elev); font-weight: 600; }

/* Inline code */
.msg-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elev-2);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
  border: 1px solid var(--border);
}
.msg-content pre {
  margin: 12px 0;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}
.msg-content pre code {
  display: block;
  padding: 14px 16px;
  background: transparent;
  color: var(--text);
  border: 0;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.55;
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 12px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-3);
}
.code-copy {
  background: transparent; border: 0; color: var(--text-3);
  font-size: 12px; padding: 2px 8px;
  border-radius: 4px;
  display: inline-flex; align-items: center; gap: 4px;
  transition: color 150ms, background 150ms;
}
.code-copy:hover { color: var(--text); background: var(--panel-hover); }

/* Message actions */
.msg-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 6px;
  opacity: 0;
  transition: opacity 150ms;
  min-height: 24px;
}
.msg:hover .msg-actions { opacity: 1; }
.msg-action-btn {
  width: 26px; height: 26px;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent;
  border: 0;
  border-radius: var(--radius-xs);
  color: var(--text-3);
  transition: all 150ms;
}
.msg-action-btn:hover { background: var(--panel-hover); color: var(--text); }
.msg-model-badge {
  margin-left: 6px;
  padding: 2px 8px;
  font-size: 11px;
  color: var(--text-3);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
}

/* Streaming cursor */
.msg-content .stream-cursor {
  display: inline-block;
  width: 7px; height: 16px;
  background: var(--accent);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s steps(2, end) infinite;
  border-radius: 1px;
}
@keyframes blink { 50% { opacity: 0; } }

/* =========================================================================
   Hero (empty state)
   ========================================================================= */
.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px 40px 24px;
  text-align: center;
}
.hero-mark {
  width: 56px; height: 56px;
  margin: 0 auto 24px auto;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(99,102,241,0.3);
}
.hero-mark svg { width: 56px; height: 56px; display: block; }
.hero-title {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 12px 0;
  background: linear-gradient(135deg, var(--text), var(--brand-1));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 16px;
  color: var(--text-2);
  margin: 0 auto 36px auto;
  max-width: 540px;
}
.starter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  max-width: 620px;
  margin: 0 auto;
}
.starter {
  text-align: left;
  padding: 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  transition: all 150ms;
}
.starter:hover {
  border-color: var(--accent);
  background: var(--bg-elev-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.starter-title { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.starter-sub { font-size: 13px; color: var(--text-3); }

/* =========================================================================
   Composer
   ========================================================================= */
.composer-wrap {
  flex-shrink: 0;
  padding: 0 16px 16px 16px;
  background: var(--bg);
}
.composer {
  max-width: 780px;
  margin: 0 auto;
}
.composer-inner {
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 6px 10px;
  transition: border-color 150ms, box-shadow 150ms;
}
.composer-inner:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

#chat-input {
  width: 100%;
  min-height: 38px;
  max-height: 260px;
  padding: 10px 8px 4px 8px;
  background: transparent;
  border: 0;
  color: var(--text);
  font: inherit;
  font-size: 15.5px;
  line-height: 1.5;
  resize: none;
  outline: none;
}
#chat-input::placeholder { color: var(--text-3); }

.composer-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 4px 2px 4px;
}
.composer-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 13px;
  transition: all 150ms;
}
.composer-btn:hover:not(:disabled) { background: var(--panel-hover); color: var(--text); border-color: var(--border); }
.composer-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.composer-spacer { flex: 1; }
.composer-status { font-size: 12px; color: var(--text-3); margin-right: 8px; }
.composer-send {
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--brand-grad);
  color: #fff;
  border: 0;
  border-radius: var(--radius-sm);
  transition: opacity 150ms, transform 150ms;
}
.composer-send:hover:not(:disabled) { opacity: 0.9; transform: scale(1.03); }
.composer-send:disabled { opacity: 0.35; cursor: not-allowed; }

.composer-foot {
  text-align: center;
  font-size: 11px;
  color: var(--text-3);
  margin-top: 8px;
}

/* =========================================================================
   Buttons (shared)
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  font-family: inherit;
  transition: all 150ms;
  text-decoration: none;
}
.btn-sm { padding: 5px 10px; font-size: 13px; }
.btn-primary {
  background: var(--brand-grad);
  color: #fff;
}
.btn-primary:hover { opacity: 0.92; }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--panel-hover); border-color: var(--border-strong); }

/* =========================================================================
   Modal
   ========================================================================= */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: modalFade 180ms ease-out;
}
.modal[hidden] { display: none; }
@keyframes modalFade { from { opacity: 0; } to { opacity: 1; } }

.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
}
.modal-panel {
  position: relative;
  width: min(92vw, 720px);
  max-height: 85vh;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalSlide 200ms cubic-bezier(.2,.8,.2,1);
}
.modal-panel-narrow { width: min(92vw, 520px); }
@keyframes modalSlide { from { transform: translateY(12px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.modal-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  padding: 18px 20px 12px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-head h2 { font-size: 17px; margin: 0 0 2px 0; letter-spacing: -0.01em; }
.modal-head .muted { font-size: 13px; margin: 0; }

.modal-search {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-search-row {
  position: relative;
}
.modal-search-row svg {
  position: absolute;
  left: 10px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  pointer-events: none;
}
#model-search {
  width: 100%;
  padding: 10px 12px 10px 34px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
#model-search:focus { border-color: var(--accent); }
.modal-filters { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.chip {
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-2);
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
  transition: all 150ms;
}
.chip:hover { background: var(--panel-hover); color: var(--text); }
.chip-active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: transparent;
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}
.modal-loading { padding: 40px; text-align: center; color: var(--text-3); font-size: 14px; }

.model-group { margin-bottom: 8px; }
.model-group-label {
  position: sticky; top: 0;
  padding: 8px 10px 6px 10px;
  background: var(--bg-elev);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  z-index: 1;
}
.model-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 120ms, border-color 120ms;
  gap: 12px;
}
.model-row:hover { background: var(--panel-hover); }
.model-row.selected { background: var(--accent-soft); border-color: var(--accent); }
.model-row-main { min-width: 0; }
.model-row-name { font-size: 14px; font-weight: 500; color: var(--text); margin-bottom: 2px; }
.model-row-meta { font-size: 12px; color: var(--text-3); display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.model-row-meta .badge {
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  color: var(--text-2);
  font-weight: 500;
  font-size: 11px;
}
.model-row-meta .badge-free { background: color-mix(in oklab, var(--success) 18%, transparent); color: var(--success); }
.model-rate {
  font-size: 11px;
  color: var(--text-3);
  padding: 4px 8px;
  border-radius: 6px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.model-rate.free { color: var(--success); }
.model-rate:empty { display: none; }

.msg-cost {
  color: var(--text-3);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  padding-left: 4px;
}

.model-row-price {
  flex-shrink: 0;
  text-align: right;
  font-size: 12px;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}

/* Settings */
.settings-body { padding: 16px 20px 20px 20px; overflow-y: auto; }
.settings-group { margin-bottom: 18px; }
.settings-label { display: block; font-size: 13px; font-weight: 500; color: var(--text-2); margin-bottom: 8px; }
.settings-body textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  resize: vertical;
  outline: none;
}
.settings-body textarea:focus { border-color: var(--accent); }
.segmented {
  display: inline-flex;
  padding: 3px;
  background: var(--bg-elev-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.seg-btn {
  padding: 6px 14px;
  background: transparent;
  border: 0;
  color: var(--text-2);
  font-size: 13px;
  font-family: inherit;
  border-radius: 4px;
  transition: all 150ms;
}
.seg-btn.active { background: var(--panel-hover); color: var(--text); }
.seg-btn:hover:not(.active) { color: var(--text); }
.settings-meta {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  padding: 12px;
  background: var(--bg-elev-2);
  border-radius: var(--radius-sm);
  font-size: 12px;
}
.settings-meta > div { display: flex; flex-direction: column; gap: 2px; }
.settings-meta strong { color: var(--text); font-weight: 500; }

/* =========================================================================
   Toast
   ========================================================================= */
.toast {
  position: fixed;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  z-index: 200;
  box-shadow: var(--shadow-lg);
  animation: toastIn 200ms ease-out;
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }
.toast[hidden] { display: none; }

/* ============================================================
   Upgrade card (shown inline when stream returns 429)
============================================================ */
.upgrade-card {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  background: linear-gradient(135deg, var(--accent-soft) 0%, color-mix(in oklab, var(--accent) 6%, var(--bg-elev)) 100%);
  border: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  border-radius: var(--radius-md);
  margin-top: 4px;
}
.upgrade-icon {
  flex-shrink: 0;
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--brand-grad);
  color: #fff;
  border-radius: 10px;
}
.upgrade-body { flex: 1; min-width: 0; }
.upgrade-heading { font-weight: 600; font-size: 15px; color: var(--text); margin-bottom: 3px; }
.upgrade-sub { font-size: 13.5px; color: var(--text-2); line-height: 1.5; margin-bottom: 12px; }
.upgrade-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-upgrade {
  display: inline-flex; align-items: center;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: all 150ms;
  border: 1px solid transparent;
}
.btn-upgrade-primary { background: var(--brand-grad); color: #fff; }
.btn-upgrade-primary:hover { opacity: 0.92; }
.btn-upgrade-ghost {
  background: transparent; color: var(--text); border-color: var(--border);
}
.btn-upgrade-ghost:hover { background: var(--panel-hover); }

/* ============================================================
   Share card (bottom-right, dismissible)
============================================================ */
.share-card {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 150;
  width: 320px;
  padding: 16px 16px 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: shareIn 280ms cubic-bezier(.2,.8,.2,1);
}
@keyframes shareIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.share-close {
  position: absolute;
  top: 8px; right: 8px;
  width: 24px; height: 24px;
  background: transparent;
  border: 0;
  color: var(--text-3);
  font-size: 14px;
  cursor: pointer;
  border-radius: 4px;
  transition: all 150ms;
}
.share-close:hover { background: var(--panel-hover); color: var(--text); }
.share-head { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; padding-right: 24px; }
.share-emoji { font-size: 22px; }
.share-title { font-weight: 600; font-size: 14px; color: var(--text); }
.share-sub { font-size: 12.5px; color: var(--text-3); line-height: 1.4; margin-top: 2px; }
.share-actions { display: flex; gap: 6px; }
.share-btn {
  flex: 1;
  display: inline-flex; align-items: center; justify-content: center;
  gap: 5px;
  padding: 7px 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 12.5px;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: all 150ms;
}
.share-btn:hover { background: var(--panel-hover); color: var(--text); border-color: var(--border-strong); }
@media (max-width: 500px) {
  .share-card { left: 12px; right: 12px; width: auto; bottom: 12px; }
}

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 840px) {
  :root { --sidebar-w: 280px; }
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: var(--sidebar-w);
    z-index: 50;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  .app-shell.sidebar-open .sidebar { transform: translateX(0); opacity: 1; pointer-events: auto; }
  .header-menu { display: inline-flex; }
  .chat-brand { display: inline-flex; }
  /* Free up header room on small screens — rate chip hides on mobile to avoid
     squeezing the model pill + brand out of view. Users can still see it in
     the picker modal. */
  .model-rate { display: none; }
  /* Wrap picker rows so the price lands on its own line instead of being
     clipped off the right edge. */
  .model-row { flex-wrap: wrap; row-gap: 4px; }
  .model-row-price { width: 100%; text-align: left; }
  .hero-title { font-size: 24px; }
  .starter-grid { grid-template-columns: 1fr; }
  .messages-scroll { padding: 18px 16px; }
  .composer-wrap { padding: 0 10px 10px 10px; }
  .chat-title-wrap { display: none; }
}