/* ============================================================================
   Chatter — styles. Design concept adapted from the CERES web GUI blueprint:
   CSS-variable theming, sidebar+header+content+statusbar shell, dark & light.
   ========================================================================== */

:root {
  --sidebar-w: 280px;
  --header-h: 52px;
  --radius: 10px;
  --radius-sm: 6px;
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Roboto Mono", Menlo, Consolas, monospace;
  --maxw: min(80%, 2000px);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.28);
}

/* ---- Dark palette (default) ---- */
:root,
[data-theme="dark"] {
  --bg-body: #080c12;
  --bg-dark: #0a0e14;
  --bg-mid: #0d1117;
  --bg-elev: #11161f;
  --border: #1a2030;
  --border-strong: #263048;
  --text-primary: #a0aec0;
  --text-secondary: #718096;
  --text-bright: #e2e8f0;
  --accent: #00ff88;
  --accent-contrast: #04120b;
  --info: #63b3ed;
  --warning: #ecc94b;
  --danger: #f56565;
  --success: #48bb78;
  --user-bubble: #16202e;
  --code-bg: #0b1017;
  --scrollbar: #263048;
}

/* ---- Light palette ---- */
[data-theme="light"] {
  --bg-body: #f5f7fa;
  --bg-dark: #ffffff;
  --bg-mid: #eef1f6;
  --bg-elev: #ffffff;
  --border: #d7dee8;
  --border-strong: #c3cddc;
  --text-primary: #2d3748;
  --text-secondary: #5a6b82;
  --text-bright: #0f1720;
  --accent: #00a862;
  --accent-contrast: #ffffff;
  --info: #2b6cb0;
  --warning: #b7791f;
  --danger: #c53030;
  --success: #2f855a;
  --user-bubble: #e7edf6;
  --code-bg: #f2f5f9;
  --scrollbar: #c3cddc;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button { font-family: inherit; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

[hidden] { display: none !important; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 6px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  color: var(--text-bright);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 14px; font-weight: 500;
  cursor: pointer;
  transition: background .15s, border-color .15s, opacity .15s;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .55; cursor: default; }
.btn-primary {
  background: var(--accent); color: var(--accent-contrast);
  border-color: var(--accent); font-weight: 600;
}
.btn-primary:hover { filter: brightness(1.08); border-color: var(--accent); }
.btn-block { width: 100%; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 40px; min-height: 40px;
  border: none; background: transparent; color: var(--text-secondary);
  border-radius: var(--radius-sm); cursor: pointer;
  transition: background .15s, color .15s;
}
.icon-btn:hover { background: var(--bg-mid); color: var(--text-bright); }

.spinner {
  width: 15px; height: 15px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.35); border-top-color: currentColor;
  animation: spin .7s linear infinite; display: none;
}
@keyframes spin { to { transform: rotate(360deg); } }
.is-busy .btn-label { visibility: hidden; }
.is-busy .spinner { display: inline-block; }

/* ============================================================================
   LOGIN
   ========================================================================== */
.login-view {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(0,255,136,.06), transparent 60%),
    var(--bg-body);
}
.login-card {
  width: 100%; max-width: 380px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 30px 26px;
  box-shadow: var(--shadow);
}
.login-header { text-align: center; margin-bottom: 22px; }
.brand-mark { color: var(--accent); display: inline-flex; }
.login-brand { font-size: 22px; margin: 10px 0 2px; color: var(--text-bright); font-weight: 700; letter-spacing: .2px; }
.login-subtitle { margin: 0; color: var(--text-secondary); font-size: 13px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12px; margin-bottom: 6px; color: var(--text-secondary); font-weight: 500; }
.field input {
  width: 100%; padding: 10px 12px;
  background: var(--bg-body); color: var(--text-bright);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  font-size: 14px; outline: none;
  transition: border-color .15s;
}
.field input:focus { border-color: var(--accent); }
.login-error { color: var(--danger); font-size: 13px; margin: 4px 0 12px; }
.btn-block { margin-top: 6px; }

/* ============================================================================
   APP SHELL
   ========================================================================== */
.app-shell { display: flex; height: 100%; width: 100%; position: relative; }

.sidebar {
  width: var(--sidebar-w); min-width: var(--sidebar-w);
  display: flex; flex-direction: column;
  background: var(--bg-dark);
  border-right: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.sidebar-top { padding: 12px; }
.conversation-scroll { flex: 1; overflow-y: auto; padding: 0 8px; }
.conversation-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.conversation-empty { color: var(--text-secondary); font-size: 13px; text-align: center; padding: 24px 8px; }

.conv-item {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 10px; border-radius: var(--radius-sm);
  cursor: pointer; color: var(--text-primary);
  border: 1px solid transparent;
}
.conv-item:hover { background: var(--bg-mid); }
.conv-item.active { background: var(--bg-mid); border-color: var(--border-strong); color: var(--text-bright); }
.conv-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13.5px; }
.conv-del {
  opacity: 0; border: none; background: transparent; color: var(--text-secondary);
  cursor: pointer; padding: 2px; border-radius: 4px; display: inline-flex;
}
.conv-item:hover .conv-del, .conv-item.active .conv-del { opacity: 1; }
.conv-del:hover { color: var(--danger); }

.sidebar-footer { border-top: 1px solid var(--border); padding: 10px 12px; display: flex; flex-direction: column; gap: 8px; }
.sidebar-link {
  display: flex; align-items: center; gap: 8px;
  background: transparent; border: none; color: var(--text-secondary);
  cursor: pointer; font-size: 13px; padding: 6px 4px; border-radius: 6px;
}
.sidebar-link:hover { color: var(--text-bright); background: var(--bg-mid); }
.usage-readout { display: flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); padding: 2px 4px; }
.usage-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

/* Main column */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.header {
  height: var(--header-h); min-height: var(--header-h);
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px;
  background: var(--bg-mid);
  border-bottom: 1px solid var(--border);
}
.menu-toggle { display: none; }
.brand { font-family: var(--font-mono); font-weight: 700; font-size: 15px; color: var(--text-bright); letter-spacing: .3px; white-space: nowrap; }
.header-spacer { flex: 1; }

.model-picker { display: flex; align-items: center; }
.model-select {
  background: var(--bg-elev); color: var(--text-bright);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 7px 10px; font-size: 13px; cursor: pointer; max-width: 220px;
}
.model-select:focus { outline: none; border-color: var(--accent); }
.model-static { font-family: var(--font-mono); font-size: 13px; color: var(--text-primary); padding: 6px 8px; }

.icon-sun, .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: block; }

.user-menu { position: relative; }
.user-menu-btn { gap: 6px; padding: 4px 8px; min-width: auto; }
.avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: var(--accent-contrast);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; text-transform: uppercase;
}
.user-name { font-size: 13px; color: var(--text-primary); max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.menu-pop {
  position: absolute; right: 0; top: calc(100% + 6px);
  min-width: 210px; background: var(--bg-elev);
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 6px; z-index: 40;
}
.menu-header { padding: 8px 10px; border-bottom: 1px solid var(--border); margin-bottom: 4px; display: flex; flex-direction: column; gap: 2px; }
.menu-username { color: var(--text-bright); font-weight: 600; font-size: 13px; }
.menu-role { color: var(--text-secondary); font-size: 11px; text-transform: uppercase; letter-spacing: .5px; }
.menu-item {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 9px 10px; border: none; background: transparent;
  color: var(--text-primary); cursor: pointer; border-radius: 6px; font-size: 13px; text-align: left;
}
.menu-item:hover { background: var(--bg-mid); }
.menu-toggle-item { justify-content: space-between; cursor: default; }
.menu-item-danger:hover { color: var(--danger); }

/* Transcript */
.transcript-wrap { position: relative; flex: 1; min-height: 0; }
.transcript { height: 100%; overflow-y: auto; padding: 22px 16px 28px; scroll-behavior: smooth; }
.transcript:focus { outline: none; }

.empty-state { max-width: var(--maxw); margin: 12vh auto 0; text-align: center; color: var(--text-secondary); }
.empty-mark { color: var(--accent); opacity: .8; }
.empty-state h2 { color: var(--text-bright); font-weight: 600; margin: 12px 0 4px; }

.message { max-width: var(--maxw); margin: 0 auto 20px; display: flex; gap: 12px; }
.message.msg-user { justify-content: flex-end; }
.msg-avatar {
  width: 28px; height: 28px; border-radius: 6px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; font-family: var(--font-mono);
}
.msg-assistant .msg-avatar { background: var(--accent); color: var(--accent-contrast); }
.msg-user .msg-avatar { display: none; }
.msg-body { min-width: 0; }
.msg-user .msg-body {
  background: var(--user-bubble); border: 1px solid var(--border);
  border-radius: 14px 14px 4px 14px; padding: 10px 14px; max-width: 88%;
  color: var(--text-bright); white-space: pre-wrap; word-wrap: break-word;
}
.msg-assistant .msg-body { flex: 1; }

/* Markdown content */
.msg-content { color: var(--text-bright); word-wrap: break-word; overflow-wrap: anywhere; }
.msg-content > *:first-child { margin-top: 0; }
.msg-content > *:last-child { margin-bottom: 0; }
.msg-content p { margin: 0 0 12px; }
.msg-content h1, .msg-content h2, .msg-content h3, .msg-content h4 { color: var(--text-bright); line-height: 1.3; margin: 18px 0 10px; }
.msg-content h1 { font-size: 1.5em; } .msg-content h2 { font-size: 1.3em; } .msg-content h3 { font-size: 1.12em; }
.msg-content ul, .msg-content ol { margin: 0 0 12px; padding-left: 24px; }
.msg-content li { margin: 4px 0; }
.msg-content a { color: var(--info); text-decoration: none; }
.msg-content a:hover { text-decoration: underline; }
.msg-content blockquote { margin: 0 0 12px; padding: 4px 14px; border-left: 3px solid var(--border-strong); color: var(--text-secondary); }
.msg-content hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.msg-content table { border-collapse: collapse; margin: 0 0 12px; display: block; overflow-x: auto; }
.msg-content th, .msg-content td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.msg-content th { background: var(--bg-mid); color: var(--text-bright); }
.msg-content :not(pre) > code {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--code-bg); border: 1px solid var(--border);
  padding: 1px 5px; border-radius: 4px; color: var(--text-bright);
}

/* Code blocks */
.code-wrap { border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; margin: 0 0 14px; background: var(--code-bg); }
.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 5px 10px; background: var(--bg-mid);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary);
}
.code-lang { text-transform: uppercase; letter-spacing: .5px; }
.copy-btn {
  border: none; background: transparent; color: var(--text-secondary);
  cursor: pointer; font-size: 11px; padding: 2px 6px; border-radius: 4px; font-family: var(--font-mono);
}
.copy-btn:hover { color: var(--text-bright); background: var(--bg-elev); }
.code-wrap pre { margin: 0; }
.msg-content pre code.hljs, .code-wrap pre code {
  display: block; overflow-x: auto; padding: 12px 14px;
  font-family: var(--font-mono); font-size: 12.5px; line-height: 1.55; background: var(--code-bg);
}

/* Thinking panel — collapsed by default; opens on click. Cute live animation. */
.thinking { border: 1px solid var(--border); border-radius: var(--radius-sm); margin: 0 0 12px; background: var(--bg-dark); overflow: hidden; transition: border-color .2s; }
.thinking.active { border-color: color-mix(in srgb, var(--accent) 32%, var(--border)); animation: think-glow 2.4s ease-in-out infinite; }
@keyframes think-glow { 50% { box-shadow: 0 0 14px -4px color-mix(in srgb, var(--accent) 50%, transparent); } }

.thinking-header {
  display: flex; align-items: center; gap: 8px; width: 100%;
  padding: 8px 12px; background: transparent; border: none; cursor: pointer;
  color: var(--text-secondary); font-size: 12.5px; font-weight: 500;
}
.thinking-header:hover { color: var(--text-bright); }
.thinking-caret { transition: transform .2s ease; flex-shrink: 0; }
.thinking:not(.collapsed) .thinking-caret { transform: rotate(90deg); }

/* Shimmering "Thinking" label while active */
.thinking-label { position: relative; }
.thinking.active .thinking-label {
  background: linear-gradient(90deg, var(--text-secondary) 20%, var(--accent) 50%, var(--text-secondary) 80%);
  background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  animation: think-shimmer 1.6s linear infinite;
}
@keyframes think-shimmer { to { background-position: -200% 0; } }

/* Bouncing dots, shown only while active */
.thinking-dots { display: none; align-items: center; gap: 3px; }
.thinking.active .thinking-dots { display: inline-flex; }
.thinking-dots i { width: 4px; height: 4px; border-radius: 50%; background: var(--accent); animation: think-bounce 1.2s ease-in-out infinite; }
.thinking-dots i:nth-child(2) { animation-delay: .16s; }
.thinking-dots i:nth-child(3) { animation-delay: .32s; }
@keyframes think-bounce { 0%, 80%, 100% { transform: translateY(0); opacity: .35; } 40% { transform: translateY(-4px); opacity: 1; } }

/* Body height has three states:
   - expanded:              full box (scrollable, autoscroll)
   - collapsed + active:    2-line streaming peek (shows the live reasoning tail)
   - collapsed + finished:  closed */
.thinking-body-wrap { overflow: hidden; }
.thinking-body {
  max-height: 340px; overflow-y: auto;
  padding: 6px 12px 12px; font-family: var(--font-mono); font-size: 12px; line-height: 1.55;
  color: var(--text-secondary); white-space: pre-wrap; word-wrap: break-word;
  transition: max-height .28s cubic-bezier(.4, 0, .2, 1), padding .28s ease, opacity .2s ease;
}
.thinking.collapsed.active .thinking-body {
  max-height: 3em; overflow: hidden; padding-top: 2px; padding-bottom: 8px;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 62%);
  mask-image: linear-gradient(to bottom, transparent 0, #000 62%);
}
.thinking.collapsed:not(.active) .thinking-body {
  max-height: 0; padding-top: 0; padding-bottom: 0; overflow: hidden; opacity: 0;
}

/* Stats line + queue */
.stats-line { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 10px; font-family: var(--font-mono); font-size: 11.5px; color: var(--text-secondary); }
.stat { display: inline-flex; align-items: center; gap: 5px; }
.stat-ic { color: var(--accent); opacity: .9; flex-shrink: 0; }
.queue-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--warning);
  background: color-mix(in srgb, var(--warning) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--warning) 40%, transparent);
  padding: 6px 12px; border-radius: 999px;
}
.queue-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warning); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.msg-error { color: var(--danger); font-size: 13px; margin-top: 6px; }

/* Composer */
.composer { padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); background: var(--bg-body); border-top: 1px solid var(--border); }
.composer-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: flex-end; gap: 8px;
  background: var(--bg-elev); border: 1px solid var(--border-strong);
  border-radius: 14px; padding: 8px 8px 8px 14px;
  transition: border-color .15s;
}
.composer-inner:focus-within { border-color: var(--accent); }
.composer-input {
  flex: 1; resize: none; border: none; background: transparent;
  color: var(--text-bright); font-family: var(--font-ui); font-size: 14.5px; line-height: 1.5;
  max-height: 200px; outline: none; padding: 6px 0;
}
.send-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px;
  border: none; background: var(--accent); color: var(--accent-contrast);
  cursor: pointer; flex-shrink: 0; transition: filter .15s, background .15s;
}
.send-btn:hover { filter: brightness(1.08); }
.send-btn:disabled { opacity: .5; cursor: default; }
.icon-stop { width: 13px; height: 13px; background: currentColor; border-radius: 2px; display: none; }
.composer.streaming .icon-send { display: none; }
.composer.streaming .icon-stop { display: block; }
.composer.streaming .send-btn { background: var(--danger); }

/* Jump to latest */
.jump-latest {
  position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%);
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--border-strong); background: var(--bg-elev); color: var(--text-bright);
  cursor: pointer; box-shadow: var(--shadow); display: flex; align-items: center; justify-content: center;
  z-index: 10;
}

/* Status bar */
.statusbar {
  height: 26px; display: flex; align-items: center; gap: 8px;
  padding: 0 14px calc(0px + env(safe-area-inset-bottom));
  background: var(--bg-dark); border-top: 1px solid var(--border);
  font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary);
}
.status-item { display: inline-flex; align-items: center; gap: 6px; }
.status-sep { opacity: .4; }
.conn-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-secondary); }
.conn-dot[data-state="ok"] { background: var(--success); }
.conn-dot[data-state="connecting"] { background: var(--warning); }
.conn-dot[data-state="error"] { background: var(--danger); }

/* Scrim + drawer */
.scrim { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 30; }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 60; }
.modal { width: 100%; max-width: 620px; max-height: 80vh; display: flex; flex-direction: column; background: var(--bg-elev); border: 1px solid var(--border-strong); border-radius: var(--radius); box-shadow: var(--shadow); }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.modal-header h2 { margin: 0; font-size: 16px; color: var(--text-bright); }
.modal-body { padding: 14px 16px; overflow-y: auto; }
.modal-loading { color: var(--text-secondary); text-align: center; padding: 20px; }
.stats-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.stats-table th, .stats-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.stats-table th { color: var(--text-secondary); font-weight: 500; }
.stats-table td { font-family: var(--font-mono); color: var(--text-bright); }

/* Toasts */
.toasts { position: fixed; top: 14px; right: 14px; z-index: 80; display: flex; flex-direction: column; gap: 8px; max-width: 360px; }
.toast {
  padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px;
  background: var(--bg-elev); border: 1px solid var(--border-strong);
  border-left: 3px solid var(--text-secondary); color: var(--text-bright);
  box-shadow: var(--shadow); animation: toast-in .2s ease;
}
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } }
.toast-info { border-left-color: var(--info); }
.toast-success { border-left-color: var(--success); }
.toast-warning { border-left-color: var(--warning); }
.toast-error { border-left-color: var(--danger); }

/* ============================================================================
   RESPONSIVE — sidebar becomes a slide-over drawer < 1024px
   ========================================================================== */
@media (max-width: 1023px) {
  .menu-toggle { display: inline-flex; }
  .sidebar {
    position: fixed; top: 0; bottom: 0; left: 0; z-index: 35;
    transform: translateX(-100%); transition: transform .2s ease;
    box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateX(0); }
  .user-name { display: none; }
}

@media (max-width: 1023px) { :root { --maxw: 92%; } }
@media (max-width: 640px) {
  :root { --maxw: 94%; }
  .toasts { left: 12px; right: 12px; max-width: none; }
  .brand { font-size: 14px; }
  .model-select { max-width: 150px; }
  .message { gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}