/* ─── CSS Custom Properties ──────────────────────────────────────────────── */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Menlo, monospace;
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 150ms ease;
  --topbar-height: 48px;
  --color-tie: #8b5cf6;
  --color-bad: #ef4444;
}

/* Slot color palette — 8 distinguishable hues */
:root {
  --slot-0: #3b82f6; --slot-0-bg: rgba(59,130,246,0.12);
  --slot-1: #f59e0b; --slot-1-bg: rgba(245,158,11,0.12);
  --slot-2: #22c55e; --slot-2-bg: rgba(34,197,94,0.12);
  --slot-3: #8b5cf6; --slot-3-bg: rgba(139,92,246,0.12);
  --slot-4: #ec4899; --slot-4-bg: rgba(236,72,153,0.12);
  --slot-5: #14b8a6; --slot-5-bg: rgba(20,184,166,0.12);
  --slot-6: #f97316; --slot-6-bg: rgba(249,115,22,0.12);
  --slot-7: #06b6d4; --slot-7-bg: rgba(6,182,212,0.12);
}

[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-hover: #222;
  --bg-active: #2a2a2a;
  --bg-input: #141414;
  --border: #2a2a2a;
  --border-focus: #4a9eff;
  --text-primary: #e8e8e8;
  --text-secondary: #999;
  --text-muted: #666;
  --accent: #4a9eff;
  --accent-hover: #3a8eef;
  --danger: #ef4444;
  --success: #22c55e;
  --code-bg: #161616;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.5);
  --pane-bg: #0e0e0e;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f8;
  --bg-tertiary: #ececee;
  --bg-hover: #e8e8ea;
  --bg-active: #ddd;
  --bg-input: #ffffff;
  --border: #e0e0e0;
  --border-focus: #2563eb;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #999;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --code-bg: #f4f4f4;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
  --pane-bg: #fafafa;

  --slot-0-bg: rgba(59,130,246,0.1);
  --slot-1-bg: rgba(245,158,11,0.1);
  --slot-2-bg: rgba(34,197,94,0.1);
  --slot-3-bg: rgba(139,92,246,0.1);
  --slot-4-bg: rgba(236,72,153,0.1);
  --slot-5-bg: rgba(20,184,166,0.1);
  --slot-6-bg: rgba(249,115,22,0.1);
  --slot-7-bg: rgba(6,182,212,0.1);
}

/* ─── Reset & Base ──────────────────────────────────────────────────────── */

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }
.muted { color: var(--text-muted); font-size: 12px; }

/* ─── Top Bar ───────────────────────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  padding: 0 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-center { display: flex; align-items: center; }
.topbar-right { display: flex; align-items: center; gap: 8px; }

.back-link {
  display: flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: var(--radius);
  color: var(--text-secondary); text-decoration: none;
  transition: background var(--transition), color var(--transition);
}
.back-link:hover { background: var(--bg-hover); color: var(--text-primary); }

.logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 700; color: var(--text-primary); white-space: nowrap;
}

.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border: none; border-radius: var(--radius);
  background: none; color: var(--text-secondary); position: relative;
  transition: background var(--transition), color var(--transition);
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

.badge {
  position: absolute; top: 2px; right: 2px;
  font-size: 10px; min-width: 16px; height: 16px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px; background: var(--accent); color: white;
  font-weight: 600; padding: 0 4px;
}
.badge:empty { display: none; }

/* ─── Mode Tabs ─────────────────────────────────────────────────────────── */

.mode-tabs { display: flex; background: var(--bg-tertiary); border-radius: var(--radius); padding: 2px; }
.mode-tab {
  padding: 6px 16px; border: none; border-radius: 6px; background: none;
  color: var(--text-secondary); font-size: 13px; font-weight: 500;
  transition: all var(--transition); white-space: nowrap;
}
.mode-tab:hover { color: var(--text-primary); }
.mode-tab.active { background: var(--bg-primary); color: var(--text-primary); box-shadow: var(--shadow); }

/* ─── Config Panel ──────────────────────────────────────────────────────── */

.config-panel {
  display: flex;
  align-items: stretch;
  padding: 10px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  gap: 8px;
  flex-shrink: 0;
  overflow-x: auto;
  scroll-behavior: smooth;
}
.config-panel::-webkit-scrollbar { height: 4px; }
.config-panel::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 2px; }

/* Individual model slot card */
.slot-card {
  flex: 0 0 260px;
  min-width: 220px;
  max-width: 320px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-primary);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  transition: border-color var(--transition);
}
.slot-card:hover { border-color: var(--text-muted); }

.slot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.slot-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.slot-remove {
  display: flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border: none; border-radius: 4px;
  background: none; color: var(--text-muted);
  transition: all var(--transition);
}
.slot-remove:hover { background: rgba(239,68,68,0.15); color: var(--danger); }

.slot-model-name {
  font-size: 12px; color: var(--text-secondary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.slot-selects {
  display: flex; align-items: center; gap: 4px;
}
.slot-selects select {
  flex: 1; min-width: 0; height: 30px; padding: 0 6px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg-input); color: var(--text-primary);
  font-size: 12px; outline: none;
  transition: border-color var(--transition);
}
.slot-selects select:focus { border-color: var(--border-focus); }
.slot-selects .model-select { flex: 2; }

.slot-sep { color: var(--text-muted); font-size: 12px; flex-shrink: 0; }

.slot-params {
  display: flex; gap: 4px;
}
.slot-param {
  display: flex; flex-direction: column; gap: 1px; flex: 1; min-width: 0;
}
.slot-param > span {
  font-size: 10px; color: var(--text-muted); text-transform: uppercase;
}
.slot-param input {
  height: 26px; padding: 0 5px;
  border: 1px solid var(--border); border-radius: 5px;
  background: var(--bg-input); color: var(--text-primary);
  font-size: 11px; font-family: var(--font-mono);
  outline: none; width: 100%;
  transition: border-color var(--transition);
}
.slot-param input:focus { border-color: var(--border-focus); }
.slot-param input[type="password"] { font-size: 10px; }

/* Add Model card */
.add-slot-card {
  flex: 0 0 120px;
  min-width: 100px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  padding: 10px;
}
.add-slot-card:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-tertiary);
}
.add-slot-card svg { flex-shrink: 0; }

/* ─── System Message ────────────────────────────────────────────────────── */

.system-msg-bar {
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.system-msg-toggle {
  display: flex; align-items: center; gap: 6px;
  width: 100%; padding: 6px 16px; border: none; background: none;
  color: var(--text-muted); font-size: 12px; cursor: pointer;
  transition: color var(--transition);
}
.system-msg-toggle:hover { color: var(--text-secondary); }
.system-msg-toggle .chevron { transition: transform var(--transition); }
.system-msg-toggle.open .chevron { transform: rotate(180deg); }

.system-msg-panel { padding: 0 16px 10px; }
.system-msg-panel textarea {
  width: 100%; padding: 8px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg-input); color: var(--text-primary);
  font-size: 13px; resize: vertical; outline: none;
}
.system-msg-panel textarea:focus { border-color: var(--border-focus); }

/* ─── Arena (N-pane) ────────────────────────────────────────────────────── */

.arena {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.arena-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--pane-bg);
  border-right: 1px solid var(--border);
}
.arena-pane:last-child { border-right: none; }

.pane-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.pane-label {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; padding: 2px 8px; border-radius: 4px;
  white-space: nowrap;
}

.pane-status {
  font-size: 11px; color: var(--text-muted); font-family: var(--font-mono);
}
.pane-status.streaming { color: var(--success); }
.pane-status.error { color: var(--danger); }

.pane-messages {
  flex: 1; overflow-y: auto; padding: 12px;
  scroll-behavior: smooth;
}

.arena-welcome {
  display: flex; align-items: center; justify-content: center;
  height: 100%; text-align: center;
  color: var(--text-muted); font-size: 13px;
}

/* ─── Message Rendering ─────────────────────────────────────────────────── */

.msg { margin-bottom: 14px; }

.msg.user {
  background: var(--bg-tertiary);
  padding: 8px 12px; border-radius: var(--radius-lg);
  font-size: 13px; line-height: 1.6;
}

.msg.assistant { font-size: 13px; line-height: 1.7; }
.msg.assistant p { margin-bottom: 6px; }
.msg.assistant p:last-child { margin-bottom: 0; }
.msg.assistant ul, .msg.assistant ol { margin: 4px 0 6px 18px; }
.msg.assistant li { margin-bottom: 2px; }

.msg.assistant pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px;
  overflow-x: auto; font-size: 12px; margin: 6px 0;
}
.msg.assistant code { font-family: var(--font-mono); font-size: 0.9em; }
.msg.assistant :not(pre) > code {
  background: var(--code-bg); padding: 2px 5px; border-radius: 4px;
  border: 1px solid var(--border);
}

.msg.error {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);
  border-radius: var(--radius); padding: 8px 12px;
  color: var(--danger); font-size: 12px;
}

.streaming-cursor::after {
  content: ""; display: inline-block; width: 7px; height: 14px;
  background: var(--text-primary); margin-left: 2px; vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.typing-indicator { display: inline-flex; gap: 4px; padding: 4px 0; }
.typing-indicator span {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--text-muted); animation: typing-dot 1.4s infinite both;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing-dot {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 4px 10px; background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  font-size: 11px; color: var(--text-muted); margin: -10px -10px 6px;
}
.copy-btn {
  display: flex; align-items: center; gap: 4px;
  padding: 2px 6px; border: none; border-radius: 4px;
  background: none; color: var(--text-muted); font-size: 11px;
  cursor: pointer; transition: all var(--transition);
}
.copy-btn:hover { color: var(--text-primary); background: var(--bg-hover); }

/* ─── Verdict Bar ───────────────────────────────────────────────────────── */

.verdict-bar {
  padding: 10px 16px; background: var(--bg-secondary);
  border-top: 1px solid var(--border); flex-shrink: 0;
}
.verdict-prompt {
  text-align: center; font-size: 13px; font-weight: 600;
  margin-bottom: 8px; color: var(--text-primary);
}
.verdict-buttons {
  display: flex; justify-content: center; gap: 6px; flex-wrap: wrap;
}
.verdict-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 6px 16px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg-tertiary);
  color: var(--text-primary); font-size: 12px; font-weight: 500;
  transition: all var(--transition);
}
.verdict-btn:hover { border-color: var(--text-muted); background: var(--bg-hover); }
.verdict-btn.selected { border-width: 2px; }

.verdict-btn.verdict-tie:hover, .verdict-btn.verdict-tie.selected {
  border-color: var(--color-tie); background: rgba(139,92,246,0.15); color: var(--color-tie);
}
.verdict-btn.verdict-bad:hover, .verdict-btn.verdict-bad.selected {
  border-color: var(--color-bad); background: rgba(239,68,68,0.1); color: var(--color-bad);
}

/* ─── Metrics Table ─────────────────────────────────────────────────────── */

.metrics-bar {
  padding: 8px 16px; background: var(--bg-secondary);
  border-top: 1px solid var(--border); flex-shrink: 0;
  overflow-x: auto;
}
.metrics-table {
  width: 100%; border-collapse: collapse;
  font-size: 12px; white-space: nowrap;
}
.metrics-table th, .metrics-table td {
  padding: 3px 10px; text-align: center;
}
.metrics-table th {
  color: var(--text-muted); font-weight: 500; font-size: 11px;
}
.metrics-table td {
  font-family: var(--font-mono); font-weight: 600;
}
.metrics-table td.winner { text-decoration: underline; text-underline-offset: 2px; }
.metrics-table .metric-label-cell {
  text-align: left; color: var(--text-muted); font-family: var(--font-sans); font-weight: 500;
}

/* ─── Input Area ────────────────────────────────────────────────────────── */

.input-area {
  padding: 10px 16px; background: var(--bg-primary);
  border-top: 1px solid var(--border); flex-shrink: 0;
}
.input-container {
  display: flex; align-items: flex-end; gap: 8px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 8px 12px;
  transition: border-color var(--transition);
}
.input-container:focus-within { border-color: var(--border-focus); }
.input-container textarea {
  flex: 1; border: none; background: none;
  color: var(--text-primary); font-size: 14px; line-height: 1.5;
  resize: none; outline: none; max-height: 200px; min-height: 24px;
}
.input-container textarea::placeholder { color: var(--text-muted); }

.send-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border: none; border-radius: 8px;
  background: var(--accent); color: white; flex-shrink: 0;
  transition: background var(--transition);
}
.send-btn:hover { background: var(--accent-hover); }
.send-btn:disabled { opacity: 0.5; cursor: default; }
.stop-btn { background: var(--danger); }
.stop-btn:hover { background: #dc2626; }

.input-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding: 4px 4px 0;
}
.text-btn {
  border: none; background: none; color: var(--text-muted);
  font-size: 12px; padding: 2px 6px; border-radius: 4px;
  cursor: pointer; transition: all var(--transition);
}
.text-btn:hover { color: var(--text-primary); background: var(--bg-hover); }

/* ─── History Drawer ────────────────────────────────────────────────────── */

.history-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 100; display: flex; justify-content: flex-end;
}
.history-drawer {
  width: 440px; max-width: 90vw; height: 100%;
  background: var(--bg-secondary); border-left: 1px solid var(--border);
  display: flex; flex-direction: column; box-shadow: var(--shadow-lg);
}
.history-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.history-header h2 { font-size: 16px; font-weight: 600; }
.history-actions { display: flex; gap: 4px; }

.history-summary {
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  display: flex; gap: 16px; flex-wrap: wrap; flex-shrink: 0;
}
.summary-stat { text-align: center; }
.summary-stat-value { font-size: 20px; font-weight: 700; color: var(--text-primary); }
.summary-stat-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; }

.history-list { flex: 1; overflow-y: auto; padding: 8px; }

.history-item {
  padding: 10px; border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 6px; background: var(--bg-primary); cursor: pointer;
  transition: border-color var(--transition);
}
.history-item:hover { border-color: var(--text-muted); }

.history-item-header {
  display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;
}
.history-item-prompt {
  font-size: 13px; color: var(--text-primary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  flex: 1; margin-right: 8px;
}
.history-item-verdict {
  font-size: 10px; font-weight: 600; padding: 2px 8px;
  border-radius: 4px; text-transform: uppercase;
  letter-spacing: 0.05em; flex-shrink: 0;
}

.history-item-models {
  font-size: 11px; color: var(--text-muted);
  display: flex; gap: 4px; align-items: center; flex-wrap: wrap;
}
.history-item-date {
  font-size: 10px; color: var(--text-muted); margin-top: 3px;
}
.history-empty {
  display: flex; align-items: center; justify-content: center;
  height: 200px; color: var(--text-muted); font-size: 14px;
}

/* ─── Blind Mode ────────────────────────────────────────────────────────── */

.blind-mode .pane-label {
  background: var(--bg-tertiary) !important; color: var(--text-muted) !important;
}
.blind-mode .slot-label {
  background: var(--bg-tertiary) !important; color: var(--text-muted) !important;
}
.blind-mode .slot-model-name { filter: blur(6px); user-select: none; }
.blind-mode .slot-selects,
.blind-mode .slot-params { filter: blur(6px); pointer-events: none; user-select: none; }

.blind-mode.revealed .slot-model-name,
.blind-mode.revealed .slot-selects,
.blind-mode.revealed .slot-params {
  filter: none; pointer-events: auto; user-select: auto;
}
.blind-mode.revealed .pane-label,
.blind-mode.revealed .slot-label {
  background: revert !important; color: revert !important;
}

/* ─── Responsive ────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .config-panel { padding: 8px; gap: 6px; }
  .slot-card { flex: 0 0 200px; min-width: 180px; }
  .arena { flex-direction: column; }
  .arena-pane { border-right: none; border-bottom: 1px solid var(--border); }
  .arena-pane:last-child { border-bottom: none; }
  .verdict-btn { padding: 5px 10px; font-size: 11px; }
  .history-drawer { width: 100%; max-width: 100vw; }
  .mode-tab { padding: 5px 10px; font-size: 12px; }
}

/* ─── Scrollbar ─────────────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; opacity: 0.3; }
::-webkit-scrollbar-thumb:hover { opacity: 0.6; }