:root {
  --bg: #080b13;
  --panel: #10162599;
  --panel-solid: #10162a;
  --panel-2: #131a2d;
  --border: #232c46;
  --border-soft: #1a2138;
  --text: #93a0ba;
  --text-dim: #5c6883;
  --text-h: #eef1f8;
  --accent: #2dd4ff;
  --accent-2: #7c5cff;
  --accent-grad: linear-gradient(135deg, #2dd4ff, #7c5cff);
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.7);
  --mono: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 0%, rgba(45, 212, 255, 0.10), transparent 45%),
    radial-gradient(circle at 85% 20%, rgba(124, 92, 255, 0.10), transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: auto, auto, 42px 42px, 42px 42px;
}

.shell {
  position: relative;
  z-index: 1;
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px 40px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-soft);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: block;
  border-radius: 8px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 1.5px;
  color: var(--text-h);
}

.brand-sub {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.3px;
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #ffe0e0;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.35);
  padding: 5px 10px 5px 8px;
  border-radius: 999px;
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--danger);
  box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.6);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.55); }
  70% { box-shadow: 0 0 0 7px rgba(248, 113, 113, 0); }
  100% { box-shadow: 0 0 0 0 rgba(248, 113, 113, 0); }
}

.attendee-count {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-dim);
}

.attendee-icon {
  filter: grayscale(1) opacity(0.7);
  font-size: 13px;
}

/* Hero */
.hero {
  text-align: center;
  padding: 34px 8px 26px;
}

.exec-badges {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--text-h);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 7px 14px;
  position: relative;
  overflow: hidden;
}

.badge::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent-grad);
  opacity: 0.08;
}

.badge em {
  font-style: normal;
  font-family: var(--sans);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.2px;
  color: var(--text-dim);
}

.hero h1 {
  font-size: 42px;
  letter-spacing: -1px;
  margin: 0 0 12px;
  color: var(--text-h);
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  max-width: 620px;
  margin: 0 auto;
  color: var(--text);
  font-size: 15.5px;
}

.topics {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 22px;
}

.topic-chip {
  font: inherit;
  font-size: 12.5px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, transform 0.15s;
}

.topic-chip:hover {
  color: var(--text-h);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* Stage layout */
.stage {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 20px;
  flex: 1;
  min-height: 0;
  padding-top: 6px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  backdrop-filter: blur(6px);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
}

.panel-copy {
  margin: 0;
  font-size: 13px;
  color: var(--text);
}

.model-panel label {
  display: block;
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.model-panel select {
  width: 100%;
  font: inherit;
  font-size: 13px;
  color: var(--text-h);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
}

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

.model-hint {
  margin: 8px 0 0;
  font-size: 11.5px;
  color: var(--text-dim);
  min-height: 1em;
}

.rules-list {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rules-list li::marker {
  color: var(--accent-2);
}

/* Chat panel */
.chat-panel {
  display: flex;
  flex-direction: column;
  min-height: 520px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.empty-state {
  margin: auto;
  text-align: center;
  max-width: 380px;
  color: var(--text-dim);
  font-size: 14px;
}

.message {
  display: flex;
  flex-direction: column;
  gap: 5px;
  max-width: 82%;
}

.message-user {
  align-self: flex-end;
  align-items: flex-end;
}

.message-assistant {
  align-self: flex-start;
  align-items: flex-start;
}

.message-role {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.message-user .message-role {
  color: var(--accent);
}

.message-assistant .message-role {
  color: var(--accent-2);
}

.message-content {
  white-space: pre-wrap;
  word-wrap: break-word;
  padding: 11px 15px;
  border-radius: 12px;
  font-size: 14.5px;
  line-height: 1.55;
  text-align: left;
}

.message-user .message-content {
  background: rgba(45, 212, 255, 0.10);
  color: var(--text-h);
  border: 1px solid rgba(45, 212, 255, 0.28);
  border-bottom-right-radius: 4px;
}

.message-assistant .message-content {
  background: var(--panel-2);
  color: var(--text-h);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.message-content .cursor {
  display: inline-block;
  width: 7px;
  height: 1em;
  margin-left: 2px;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.message-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.message-attachment-thumb {
  width: 92px;
  height: 92px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.message-attachment-file {
  font-size: 12.5px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
}

/* Composer */
.composer-wrap {
  border-top: 1px solid var(--border-soft);
  padding: 12px 18px 16px;
  flex-shrink: 0;
  background: rgba(8, 11, 19, 0.4);
}

.composer-wrap.dragging {
  background: rgba(45, 212, 255, 0.06);
  outline: 2px dashed var(--accent);
  outline-offset: -6px;
}

.attachments-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 10px;
}

.attachment-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px 4px 4px;
  border-radius: 20px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--text-h);
  max-width: 220px;
}

.attachment-thumb {
  width: 26px;
  height: 26px;
  object-fit: cover;
  border-radius: 50%;
  flex-shrink: 0;
}

.attachment-icon {
  flex-shrink: 0;
}

.attachment-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-size {
  color: var(--text-dim);
  flex-shrink: 0;
}

.attachment-remove {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  padding: 0 2px;
  flex-shrink: 0;
}

.attachment-remove:hover {
  color: var(--text-h);
}

.attach-error,
.attach-warning {
  font-size: 12.5px;
  padding: 0 2px 8px;
}

.attach-error {
  color: var(--danger);
}

.attach-warning {
  color: var(--warning);
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.attach-button {
  flex-shrink: 0;
  font-size: 17px;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text-h);
  cursor: pointer;
  transition: opacity 0.2s, border-color 0.2s;
}

.attach-button:hover {
  border-color: var(--accent);
}

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

.composer textarea {
  flex: 1;
  resize: none;
  font: inherit;
  font-size: 14.5px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #0b0f1a;
  color: var(--text-h);
}

.composer textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(45, 212, 255, 0.12);
}

.composer textarea:disabled {
  opacity: 0.6;
}

.send-button {
  font: inherit;
  font-weight: 700;
  font-size: 13.5px;
  padding: 0 22px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--accent-grad);
  color: #06121a;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s;
  flex-shrink: 0;
}

.send-button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.send-button:not(:disabled):hover {
  transform: translateY(-1px);
}

/* Footer */
.app-footer {
  text-align: center;
  padding-top: 22px;
  margin-top: 8px;
}

.app-footer p {
  margin: 0;
  font-size: 11.5px;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto;
}

/* Responsive */
@media (max-width: 860px) {
  .stage {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }

  .chat-panel {
    order: 1;
    min-height: 460px;
  }

  .hero h1 {
    font-size: 32px;
  }
}

@media (max-width: 520px) {
  .shell {
    padding: 16px 14px 28px;
  }

  .topbar {
    justify-content: center;
    text-align: center;
  }

  .message {
    max-width: 92%;
  }
}