:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface2: #243044;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-dim: #0ea5e9;
  --user-bg: #1e3a5f;
  --assistant-bg: #1e293b;
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;
  --font: "Segoe UI", system-ui, sans-serif;
  --mono: "Cascadia Code", "Consolas", monospace;
}

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

html {
  height: 100%;
}

body {
  margin: 0;
  height: 100%;
  max-height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: var(--accent);
}

.site-header {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.6rem 1rem 0.65rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  width: 100%;
}

.site-header h1 {
  margin: 0;
  font-size: 1.2rem;
}

.subtitle {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.header-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.model-picker {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.model-picker-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.model-select {
  width: 100%;
  padding: 0.45rem 0.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.model-select:disabled {
  opacity: 0.6;
}

.model-desc {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--muted);
  white-space: pre-line;
}

.model-filter-f16 {
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.metrics-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  padding: 0.4rem 0.65rem;
  min-width: 0;
  border-right: 1px solid var(--border);
}

.metric-item:last-child {
  border-right: none;
}

.metric-item-tps .metric-num {
  color: var(--success);
}

.metric-kicker {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.metric-num {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--accent);
}

.metric-desc {
  font-size: 0.7rem;
  line-height: 1.35;
  color: var(--muted);
  word-break: break-word;
}

@media (max-width: 900px) {
  .metrics-strip {
    grid-template-columns: 1fr;
  }

  .metric-item {
    border-right: none;
    border-bottom: 1px solid var(--border);
    flex-direction: row;
    flex-wrap: wrap;
    align-items: baseline;
    column-gap: 0.5rem;
  }

  .metric-item:last-child {
    border-bottom: none;
  }

  .metric-kicker {
    flex: 0 0 5.5rem;
  }

  .metric-num {
    flex: 1 1 auto;
    font-size: 1rem;
  }

  .metric-desc {
    flex: 1 1 100%;
    padding-left: 5.5rem;
  }
}

.badge {
  font-size: 0.8rem;
  padding: 0.35rem 0.65rem;
  background: var(--surface2);
  border-radius: 6px;
  font-family: var(--mono);
}

.status-pill {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-pill[data-state="idle"] {
  background: var(--surface2);
  color: var(--muted);
}

.status-pill[data-state="loading"] {
  background: #422006;
  color: var(--warning);
}

.status-pill[data-state="ready"] {
  background: #14532d;
  color: var(--success);
}

.status-pill[data-state="generating"] {
  background: #1e3a5f;
  color: var(--accent);
}

.status-pill[data-state="error"] {
  background: #450a0a;
  color: var(--error);
}

.toggle-inspector {
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.loading-overlay[hidden] {
  display: none;
}

.loading-card {
  max-width: 520px;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.loading-card h2 {
  margin: 0 0 0.5rem;
}

.loading-model {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin: 0 0 1rem;
}

.progress-track {
  height: 10px;
  background: var(--surface2);
  border-radius: 5px;
  overflow: hidden;
}

.progress-bar {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  transition: width 0.2s ease;
}

.progress-text {
  text-align: center;
  font-weight: 600;
  margin: 0.5rem 0;
}

.loading-wait {
  margin: 0.5rem 0 0.75rem;
  padding: 0.65rem 0.75rem;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--warning);
  background: #42200644;
  border: 1px solid #fbbf2444;
  border-radius: 8px;
  animation: pulse-wait 2s ease-in-out infinite;
}

@keyframes pulse-wait {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.75;
  }
}

.loading-overlay.is-active .loading-wait {
  display: block;
}

.loading-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.loading-overlay.gpu-fatal .progress-track {
  opacity: 0.35;
}

.gpu-recovery-panel {
  margin: 0.75rem 0;
  padding: 0.85rem;
  background: #42200655;
  border: 1px solid #fbbf2466;
  border-radius: 8px;
}

.gpu-recovery-text {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: pre-line;
  color: var(--text);
}

.btn-reload-page {
  width: 100%;
  padding: 0.6rem 1rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: var(--accent-dim);
  color: #fff;
}

.btn-reload-page:hover {
  background: var(--accent);
}

.webgpu-status {
  font-size: 0.85rem;
  margin: 0 0 0.75rem;
}

.webgpu-status.ok {
  color: var(--success);
}

.webgpu-status.warn {
  color: var(--warning);
}

.loading-log {
  max-height: 140px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.72rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  margin: 0;
  white-space: pre-wrap;
}

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(200px, 240px) minmax(0, 1fr) minmax(260px, 320px);
  gap: 0;
  overflow: hidden;
}

.layout.inspector-hidden {
  grid-template-columns: minmax(220px, 280px) 1fr;
}

.layout.inspector-hidden .panel-inspector {
  display: none;
}

.panel {
  padding: 0.65rem 0.85rem;
  border-right: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel:last-child {
  border-right: none;
}

.panel-title,
.panel h2 {
  flex-shrink: 0;
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.panel-lesson {
  overflow-y: auto;
}

.lesson-block {
  margin-bottom: 1rem;
}

.lesson-block h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  color: var(--accent);
}

.lesson-block p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.panel-chat {
  min-width: 0;
  min-height: 0;
}

.chat-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-bottom: 0.35rem;
}

.chat-toolbar .panel-title {
  margin-bottom: 0;
}

.btn-reset-context {
  font-size: 0.72rem;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--muted);
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
}

.btn-reset-context:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--accent);
}

.btn-reset-context:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.chat-footer {
  flex-shrink: 0;
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.suggestions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  margin-bottom: 0.5rem;
}

.suggestions-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.chip {
  font-size: 0.78rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  border-radius: 999px;
  cursor: pointer;
}

.chip:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.chip:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.messages {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding-right: 0.25rem;
  margin-bottom: 0.35rem;
}

.msg {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  max-width: 95%;
  font-size: 0.92rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg.user {
  align-self: flex-end;
  background: var(--user-bg);
  border: 1px solid #2563eb44;
}

.msg.assistant {
  align-self: flex-start;
  background: var(--assistant-bg);
  border: 1px solid var(--border);
}

.msg .role {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.chat-form {
  display: flex;
  gap: 0.5rem;
}

.chat-form input {
  flex: 1;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

.chat-form input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.chat-form .btn-stop {
  padding: 0.65rem 1.1rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  background: #b91c1c;
  color: #fff;
}

.chat-form .btn-stop:hover:not(:disabled) {
  background: #dc2626;
}

.chat-form button[type="submit"],
.chat-form #send-btn {
  padding: 0.65rem 1.25rem;
  background: var(--accent-dim);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.chat-form button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.turn-select-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.turn-select-row select {
  flex: 1;
  padding: 0.35rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.inspector-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.tab {
  font-size: 0.75rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--muted);
  border-radius: 6px;
  cursor: pointer;
}

.tab.active {
  background: var(--accent-dim);
  color: #fff;
  border-color: var(--accent);
}

.inspector-toolbar {
  margin-bottom: 0.5rem;
}

.btn-copy {
  font-size: 0.78rem;
  padding: 0.3rem 0.6rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
}

.btn-copy:disabled {
  opacity: 0.5;
}

.panel-inspector {
  min-height: 0;
}

.inspector-content {
  flex: 1;
  min-height: 0;
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.45;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.site-footer {
  flex-shrink: 0;
  padding: 0.35rem 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.7rem;
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 1024px) {
  body {
    overflow: auto;
    max-height: none;
  }

  .layout {
    flex: none;
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: none;
  }

  .panel-chat {
    min-height: 70vh;
    order: 1;
  }

  .panel-inspector {
    order: 2;
    max-height: 40vh;
  }

  .panel-lesson {
    order: 3;
  }

  .messages {
    min-height: 200px;
    max-height: 45vh;
  }
}