/* Refactored stylesheet for COP AI app */
/* Consolidated to remove repeated selector overrides and make editing safer for future changes. */

/* Design tokens */
:root {
  --bg: #07111f;
  --bg-2: #0b1729;
  --panel: rgba(12, 22, 39, 0.72);
  --panel-strong: rgba(16, 29, 50, 0.92);
  --panel-soft: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(137, 192, 255, 0.28);
  --text: #eff5ff;
  --muted: #97aac6;
  --accent: #7dd3fc;
  --accent-2: #8b9dff;
  --accent-3: #67e8d5;
  --assistant: rgba(255, 255, 255, 0.07);
  --danger: #ff7b8a;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --ui-page-bg: linear-gradient(180deg, rgba(248, 250, 252, 0.92), rgba(241, 245, 249, 0.90));
  --ui-page-accent: radial-gradient(circle at top right, rgba(59, 130, 246, 0.04), transparent 26%);
  --ui-container-bg: rgba(255, 255, 255, 0.82);
  --ui-sidebar-bg: linear-gradient(180deg, #fbfbfe 0%, #f6f7fb 100%);
  --ui-sidebar-border: #e8ebf2;
  --ui-session-panel-bg: linear-gradient(180deg, rgba(19, 32, 54, 0.92), rgba(12, 22, 39, 0.86));
  --ui-session-panel-border: rgba(255, 255, 255, 0.09);
  --ui-session-panel-shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  --ui-main-bg: linear-gradient(180deg, rgba(248, 250, 252, 0.92), rgba(241, 245, 249, 0.90)), radial-gradient(circle at top right, rgba(59, 130, 246, 0.04), transparent 26%);
  --ui-topbar-bg: rgba(255, 255, 255, 0.72);
  --ui-topbar-border: #e3e8f1;
  --ui-surface-bg: #ffffff;
  --ui-surface-border: #dbe2ee;
  --ui-surface-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
  --ui-text: #38506a;
  --ui-muted: #66778b;
  --ui-control-bg: #ffffff;
  --ui-control-border: #d7ddeb;
  --ui-control-fg: var(--ui-text);
  --ui-control-hover-bg: #ffffff;
  --ui-control-hover-border: #cfd6e4;
  --ui-control-hover-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
  --ui-chat-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(248, 250, 252, 0.35));
  --ui-message-border: #dbe2ee;
  --ui-message-shadow: 0 8px 20px rgba(15, 23, 42, 0.04);
  --ui-message-user-bg: linear-gradient(135deg, #2563eb, #4f8cff);
  --ui-message-user-fg: #ffffff;
  --ui-message-assistant-bg: #ffffff;
  --ui-message-assistant-fg: var(--ui-text);
  --ui-message-kicker: var(--ui-muted);
  --ui-copy-bg: rgba(255, 255, 255, 0.92);
  --ui-copy-border: #d7ddeb;
  --ui-copy-fg: var(--ui-muted);
  --ui-system-bg: #f8fafc;
  --ui-system-fg: var(--ui-muted);
  --ui-composer-shell-bg: transparent;
  --ui-composer-bg: rgba(255, 255, 255, 0.82);
  --ui-composer-border: #dbe2ee;
  --ui-composer-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
  --ui-composer-text: var(--ui-text);
  --ui-composer-placeholder: #94a3b8;
  --ui-secondary-bg: #ffffff;
  --ui-secondary-border: #d7ddeb;
  --ui-secondary-fg: var(--ui-text);
  --ui-primary-shadow: 0 10px 20px rgba(37, 99, 235, 0.18);
  --ui-session-item-bg: rgba(255, 255, 255, 0.04);
  --ui-session-item-border: rgba(255, 255, 255, 0.08);
  --ui-session-item-fg: var(--ui-text);
  --ui-session-item-hover-bg: rgba(255, 255, 255, 0.06);
  --ui-session-item-hover-border: rgba(125, 211, 252, 0.30);
  --ui-session-item-active-bg: rgba(45, 108, 255, 0.16);
  --ui-session-item-active-border: rgba(125, 211, 252, 0.42);
  --ui-session-delete-bg: #ffffff;
  --ui-session-delete-border: #d7ddeb;
  --ui-session-delete-fg: var(--ui-muted);
  --ui-session-delete-hover-bg: #f8fafc;
  --ui-session-delete-hover-border: #cfd6e4;
  --ui-session-delete-hover-fg: var(--ui-text);
  --ui-session-search-bg: rgba(255, 255, 255, 0.04);
  --ui-session-search-border: rgba(255, 255, 255, 0.10);
  --ui-session-search-placeholder: rgba(151, 170, 198, 0.75);
  --ui-session-status: #3b82f6;
  --ui-session-spinner-border: rgba(59, 130, 246, 0.22);
  --ui-session-spinner-top: #3b82f6;
  --ui-session-item-divider: rgba(148, 163, 184, 0.14);
  --ui-session-item-active-shadow: inset 3px 0 0 #3b82f6;
  --ui-session-scrollbar-thumb: #d4d9e4;
  --ui-session-scrollbar-thumb-hover: #c4cad7;
  --ui-settings-panel-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(243, 247, 252, 0.96));
  --ui-settings-panel-border: rgba(219, 226, 238, 0.96);
  --ui-settings-panel-shadow: -26px 0 60px rgba(15, 23, 42, 0.12);
  --ui-settings-header-bg: linear-gradient(135deg, rgba(239, 246, 255, 0.98), rgba(225, 236, 250, 0.98));
  --ui-settings-header-border: rgba(215, 222, 234, 0.96);
  --ui-settings-eyebrow: var(--ui-muted);
  --ui-settings-title: var(--ui-text);
  --ui-settings-copy: var(--ui-muted);
  --ui-settings-section-title: var(--ui-muted);
  --ui-settings-item-bg: rgba(255, 255, 255, 0.80);
  --ui-settings-item-border: rgba(219, 226, 238, 0.96);
  --ui-settings-item-fg: var(--ui-text);
  --ui-settings-item-hover-bg: rgba(248, 250, 252, 0.96);
  --ui-settings-item-hover-border: rgba(207, 214, 228, 1);
  --ui-settings-backdrop: rgba(15, 23, 42, 0.20);
}
html[data-theme="dark"] {
  --ui-page-bg: linear-gradient(180deg, rgba(6, 11, 20, 0.92), rgba(7, 13, 24, 0.96));
  --ui-page-accent: radial-gradient(circle at top right, rgba(125, 211, 252, 0.07), transparent 28%);
  --ui-container-bg: rgba(6, 12, 22, 0.45);
  --ui-sidebar-bg: linear-gradient(180deg, rgba(8, 15, 28, 0.96), rgba(8, 15, 28, 0.78)), radial-gradient(circle at top, rgba(125, 211, 252, 0.12), transparent 36%);
  --ui-sidebar-border: rgba(255, 255, 255, 0.08);
  --ui-session-panel-bg: linear-gradient(180deg, rgba(19, 32, 54, 0.92), rgba(12, 22, 39, 0.86));
  --ui-session-panel-border: rgba(255, 255, 255, 0.09);
  --ui-session-panel-shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  --ui-main-bg: linear-gradient(180deg, rgba(6, 11, 20, 0.92), rgba(7, 13, 24, 0.96)), radial-gradient(circle at top right, rgba(125, 211, 252, 0.07), transparent 28%);
  --ui-topbar-bg: rgba(8, 15, 27, 0.42);
  --ui-topbar-border: rgba(255, 255, 255, 0.06);
  --ui-surface-bg: linear-gradient(180deg, rgba(19, 32, 54, 0.92), rgba(12, 22, 39, 0.86));
  --ui-surface-border: rgba(255, 255, 255, 0.09);
  --ui-surface-shadow: 0 6px 16px rgba(15, 23, 42, 0.04);
  --ui-text: #c5d2e1;
  --ui-muted: #93a7c1;
  --ui-control-bg: rgba(255, 255, 255, 0.04);
  --ui-control-border: rgba(255, 255, 255, 0.10);
  --ui-control-fg: var(--ui-text);
  --ui-control-hover-bg: rgba(255, 255, 255, 0.08);
  --ui-control-hover-border: rgba(125, 211, 252, 0.30);
  --ui-control-hover-shadow: none;
  --ui-chat-bg: linear-gradient(180deg, rgba(7, 14, 26, 0.76), rgba(8, 15, 28, 0.92)), radial-gradient(circle at 20% 0%, rgba(139, 157, 255, 0.08), transparent 26%);
  --ui-message-border: rgba(255, 255, 255, 0.08);
  --ui-message-shadow: 0 14px 30px rgba(0, 0, 0, 0.20);
  --ui-message-user-bg: linear-gradient(135deg, #2563eb, #4f8cff);
  --ui-message-user-fg: #ffffff;
  --ui-message-assistant-bg: linear-gradient(180deg, rgba(18, 28, 47, 0.96), rgba(13, 23, 40, 0.98));
  --ui-message-assistant-fg: var(--ui-text);
  --ui-message-kicker: var(--ui-muted);
  --ui-copy-bg: rgba(255, 255, 255, 0.04);
  --ui-copy-border: rgba(255, 255, 255, 0.10);
  --ui-copy-fg: var(--ui-muted);
  --ui-system-bg: rgba(255, 255, 255, 0.04);
  --ui-system-fg: var(--ui-muted);
  --ui-composer-shell-bg: linear-gradient(180deg, rgba(6, 11, 20, 0.00), rgba(6, 11, 20, 0.22) 28%, rgba(6, 11, 20, 0.42));
  --ui-composer-bg: rgba(10, 18, 32, 0.92);
  --ui-composer-border: rgba(255, 255, 255, 0.10);
  --ui-composer-shadow: 0 18px 50px rgba(0, 0, 0, 0.26);
  --ui-composer-text: var(--ui-text);
  --ui-composer-placeholder: rgba(151, 170, 198, 0.72);
  --ui-secondary-bg: rgba(255, 255, 255, 0.05);
  --ui-secondary-border: rgba(255, 255, 255, 0.10);
  --ui-secondary-fg: var(--ui-text);
  --ui-primary-shadow: 0 14px 24px rgba(45, 108, 255, 0.28);
  --ui-session-item-fg: var(--ui-text);
  --ui-session-item-divider: rgba(255, 255, 255, 0.08);
  --ui-session-item-hover-bg: rgba(255, 255, 255, 0.06);
  --ui-session-item-hover-border: rgba(125, 211, 252, 0.30);
  --ui-session-item-active-bg: rgba(45, 108, 255, 0.16);
  --ui-session-item-active-border: rgba(125, 211, 252, 0.42);
  --ui-session-item-active-shadow: inset 3px 0 0 #3b82f6;
  --ui-session-search-bg: rgba(255, 255, 255, 0.04);
  --ui-session-search-border: rgba(255, 255, 255, 0.10);
  --ui-session-search-placeholder: rgba(151, 170, 198, 0.72);
  --ui-session-status: #3b82f6;
  --ui-session-spinner-border: rgba(59, 130, 246, 0.22);
  --ui-session-spinner-top: #3b82f6;
  --ui-session-scrollbar-thumb: rgba(255, 255, 255, 0.12);
  --ui-session-scrollbar-thumb-hover: rgba(255, 255, 255, 0.20);
  --ui-settings-panel-bg: linear-gradient(180deg, rgba(8, 15, 28, 0.96), rgba(10, 18, 32, 0.94)), radial-gradient(circle at top left, rgba(125, 211, 252, 0.10), transparent 30%);
  --ui-settings-panel-border: rgba(255, 255, 255, 0.08);
  --ui-settings-panel-shadow: -26px 0 60px rgba(0, 0, 0, 0.30);
  --ui-settings-header-bg: linear-gradient(135deg, rgba(12, 30, 54, 0.96), rgba(15, 38, 64, 0.96));
  --ui-settings-header-border: rgba(255, 255, 255, 0.08);
  --ui-settings-eyebrow: rgba(255, 255, 255, 0.70);
  --ui-settings-title: #ffffff;
  --ui-settings-copy: rgba(239, 245, 255, 0.76);
  --ui-settings-section-title: rgba(255, 255, 255, 0.68);
  --ui-settings-item-bg: rgba(255, 255, 255, 0.04);
  --ui-settings-item-border: rgba(255, 255, 255, 0.08);
  --ui-settings-item-fg: var(--ui-text);
  --ui-settings-item-hover-bg: rgba(255, 255, 255, 0.06);
  --ui-settings-item-hover-border: rgba(125, 211, 252, 0.22);
  --ui-settings-backdrop: rgba(1, 9, 20, 0.52);
}

/* Base */
* {
  box-sizing: border-box;
}
html, body {
  min-height: 100%;
}
body {
  margin: 0;
  color: var(--ui-text);
  font-family: "Segoe UI Variable", "SF Pro Display", "Aptos", "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at 12% 0%, rgba(59, 130, 246, 0.08), transparent 24%), radial-gradient(circle at 88% 12%, rgba(14, 165, 233, 0.06), transparent 22%), linear-gradient(180deg, #f8fafc 0%, #eef2f8 100%);
  overflow: hidden;
}
body::before, body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}
body::before {
  background-image: linear-gradient(rgba(15, 23, 42, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.3), transparent 70%);
  opacity: 0.16;
}
body::after {
  background: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.06), transparent 34%), radial-gradient(circle at 50% 100%, rgba(14, 165, 233, 0.05), transparent 38%);
  filter: blur(18px);
  opacity: 0.9;
}

/* Layout */
#container {
  position: relative;
  z-index: 1;
  width: 100vw;
  height: 100vh;
  margin: 0;
  display: grid;
  grid-template-columns: clamp(320px, 18vw, 360px) 1fr;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: none;
  backdrop-filter: blur(18px);
}
.sidebar, .main {
  min-height: 0;
}
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  border-right: 1px solid #dfe5ef;
  background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
  color: var(--ui-text);
  height: 100%;
}
.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--ui-main-bg);
  position: relative;
  isolation: isolate;
}
.main::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(125, 211, 252, 0.13) 1px, transparent 1.4px), radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.05) 1px, transparent 1.4px), radial-gradient(circle at 20% 14%, rgba(139, 157, 255, 0.10), transparent 24%), radial-gradient(circle at 82% 18%, rgba(103, 232, 213, 0.08), transparent 20%);
  background-size: 24px 24px, 72px 72px, 100% 100%, 100% 100%;
  background-position: 0 0, 0 0, center, center;
  opacity: 0.34;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.92), rgba(0, 0, 0, 0.78) 45%, rgba(0, 0, 0, 0.08) 100%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.92), rgba(0, 0, 0, 0.78) 45%, rgba(0, 0, 0, 0.08) 100%);
}
.main > * {
  position: relative;
  z-index: 1;
}
.topbar {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--ui-topbar-border);
  background: var(--ui-topbar-bg);
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* Branding */
.brand {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: 2px 0 0;
}
.brand-mark {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid #d8deea;
  display: grid;
  place-items: center;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  margin: -1px 0 0 -1px;
  overflow: hidden;
  flex: 0 0 auto;
}
.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 4px;
  display: block;
}
.brand-copy {
  min-width: 0;
  display: grid;
  gap: 2px;
}
.brand h1 {
  margin: 0;
  font-size: 25px;
  line-height: 1.04;
  letter-spacing: -0.05em;
  font-weight: 840;
  color: var(--ui-text);
}
.subtitle {
  margin: 0;
  color: var(--ui-muted);
  font-size: 11px;
  line-height: 1.4;
  max-width: 260px;
}
.sidebar .sidebar 
/* Sidebar panels */
.sessions-panel, .card {
  padding: 12px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  background: linear-gradient(180deg, rgba(19, 32, 54, 0.92), rgba(12, 22, 39, 0.86));
}
.sessions-panel {
  padding: 12px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  border-radius: 8px;
  background: var(--ui-surface-bg);
  border: 1px solid var(--ui-surface-border);
  box-shadow: var(--ui-surface-shadow);
  flex: 1 1 auto;
  overflow: hidden;
}
.sessions-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 36px;
}
.sessions-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.icon-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--ui-control-border);
  border-radius: 14px;
  background: var(--ui-control-bg);
  color: var(--ui-control-fg);
  cursor: pointer;
  display: grid;
  place-items: center;
  font: inherit;
  font-size: 22px;
  line-height: 1;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}
.icon-button:hover, .icon-button:focus-visible {
  transform: translateY(-1px);
  background: #ffffff;
  border-color: #cfd6e4;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
}
.panel-title {
  margin: 0;
  color: var(--ui-muted);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
}
.session-search {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  min-height: 44px;
  border-radius: 16px;
  border: 1px solid var(--ui-session-search-border);
  background: var(--ui-session-search-bg);
}
.search-icon {
  color: #6f7686;
  font-size: 19px;
  line-height: 1;
  flex: 0 0 auto;
}
.session-search input {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ui-text);
  font: inherit;
  font-size: 15px;
}
.session-search input::placeholder {
  color: var(--ui-muted);
}
.panel-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.panel-meta {
  color: var(--ui-muted);
  font-size: 12px;
}
.subtle {
  color: var(--ui-muted);
  font-size: 13px;
  padding: 8px 4px;
}

/* Session list */
.session-list {
  display: flex;
  gap: 4px;
  max-height: none;
  overflow-y: scroll;
  padding-right: 0;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  scrollbar-gutter: stable;
}
.session-row {
  position: relative;
  display: block;
}
.session-item {
  min-width: 0;
  width: 100%;
  text-align: left;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--ui-session-item-fg);
  padding: 9px 8px 9px 12px;
  cursor: pointer;
  transition: background 120ms ease, box-shadow 120ms ease, transform 120ms ease, color 120ms ease;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--ui-session-item-divider);
}
.session-item.pending {
  background: var(--ui-session-item-active-bg);
}
.session-item:hover {
  transform: translateY(-1px);
  border-color: var(--ui-session-item-hover-border);
  background: var(--ui-session-item-hover-bg);
}
.session-item.active {
  border-color: var(--ui-session-item-active-border);
  background: var(--ui-session-item-active-bg);
  box-shadow: var(--ui-session-item-active-shadow);
}
.session-header {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.session-title {
  margin: 0;
  font-size: 14px;
  font-weight: 720;
  line-height: 1.18;
  color: var(--ui-text);
  letter-spacing: -0.025em;
  flex: 1 1 auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.session-meta, .subtle {
  color: var(--ui-muted);
  font-size: 12px;
}
.session-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--ui-muted);
  font-size: 12px;
  line-height: 1.2;
}
.session-status {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ui-session-status);
}
.session-spinner {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: 1.8px solid var(--ui-session-spinner-border);
  border-top-color: var(--ui-session-spinner-top);
  animation: spin 0.9s linear infinite;
}
.session-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 4;
  pointer-events: none;
}
.session-delete {
  width: 28px;
  min-width: 28px;
  height: 28px;
  border: 1px solid var(--ui-control-border);
  border-radius: 6px;
  background: var(--ui-control-bg);
  color: var(--ui-muted);
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: auto;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, color 140ms ease, opacity 140ms ease;
  box-shadow: none;
}
.session-delete svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}
.session-row:hover .session-delete, .session-row:focus-within .session-delete {
  opacity: 1;
  pointer-events: auto;
}
.session-delete:hover, .session-delete:focus-visible {
  transform: translateY(-1px);
  border-color: var(--ui-control-hover-border);
  background: var(--ui-control-hover-bg);
  color: var(--ui-control-fg);
}
.session-list::-webkit-scrollbar {
  width: 8px;
}
.session-list::-webkit-scrollbar-track {
  background: transparent;
}
.session-list::-webkit-scrollbar-thumb {
  background: var(--ui-session-scrollbar-thumb);
  border-radius: 999px;
}
.session-list::-webkit-scrollbar-thumb:hover {
  background: var(--ui-session-scrollbar-thumb-hover);
}

/* Cards and empty state */
.empty-state {
  padding: 24px 24px 0;
}
.empty-state.hidden {
  display: none;
}
.empty-card {
  max-width: 860px;
}
.card h2, .empty-card h2 {
  color: var(--ui-text);
}
.card h2 {
  margin: 0 0 10px 0;
  font-size: 13px;
  letter-spacing: 0.02em;
}
.card, .empty-card {
  background: var(--ui-surface-bg);
  border: 1px solid var(--ui-surface-border);
  box-shadow: var(--ui-surface-shadow);
}
.quick-prompts {
  display: grid;
  gap: 10px;
}
.prompt-chip {
  width: 100%;
  display: block;
  border: 1px solid var(--ui-surface-border);
  border-radius: 18px;
  padding: 10px 12px;
  background: var(--ui-control-bg);
  color: var(--ui-control-fg);
  text-align: left;
  font: inherit;
  font-size: 12px;
  line-height: 1.4;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}
.prompt-chip:hover {
  transform: translateY(-1px);
  border-color: #cfd7e5;
  background: #f8fafc;
}

/* Settings panel */
#settingsButton, #themeButton {
  width: 48px;
  height: 48px;
  border: 1px solid var(--ui-control-border);
  border-radius: 16px;
  background: var(--ui-control-bg);
  color: var(--ui-control-fg);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}
#settingsButton svg, #themeButton svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2.1;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}
#settingsButton:hover, #themeButton:hover {
  transform: translateY(-1px);
  background: var(--ui-control-hover-bg);
  border-color: var(--ui-control-hover-border);
  box-shadow: var(--ui-control-hover-shadow);
}
#settingsPanel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 40;
  width: min(420px, 92vw);
  height: 100vh;
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-left: 1px solid var(--ui-settings-panel-border);
  background: var(--ui-settings-panel-bg);
  box-shadow: var(--ui-settings-panel-shadow);
  transform: translateX(102%);
  transition: transform 220ms ease;
  overflow-y: auto;
  scrollbar-gutter: stable;
}
#settingsPanel.open {
  transform: translateX(0);
}
#settingsPanel.hidden {
  display: none;
}
.settings-backdrop {
  position: fixed;
  inset: 0;
  z-index: 35;
  background: var(--ui-settings-backdrop);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 220ms ease;
}
.settings-backdrop.open {
  opacity: 1;
}
.settings-backdrop.hidden {
  display: none;
}
.settings-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 12px 10px;
  border-radius: 18px;
  background: var(--ui-settings-header-bg);
  border: 1px solid var(--ui-settings-header-border);
}
.settings-eyebrow {
  margin: 0 0 4px 0;
  color: var(--ui-settings-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 10px;
  font-weight: 800;
}
.settings-header h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.1;
  color: var(--ui-settings-title);
}
.settings-copy {
  margin: 0;
  color: var(--ui-settings-copy);
  font-size: 12px;
  line-height: 1.55;
}
.settings-menu {
  display: grid;
  gap: 14px;
}
.settings-section {
  display: grid;
  gap: 8px;
}
.settings-section-title {
  margin: 0;
  padding: 0 2px;
  color: var(--ui-settings-section-title);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.settings-list {
  display: grid;
  gap: 8px;
}
.settings-item {
  width: 100%;
  border: 1px solid var(--ui-settings-item-border);
  border-radius: 18px;
  padding: 13px 14px 12px;
  background: var(--ui-settings-item-bg);
  color: var(--ui-settings-item-fg);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 12px;
  font: inherit;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}
#settingsPanel .settings-item {
  border-width: 1px;
  border-style: solid;
  border-color: var(--ui-settings-item-border);
  background: var(--ui-settings-item-bg);
  color: var(--ui-settings-item-fg);
}
.settings-item:hover {
  transform: translateY(-1px);
  background: var(--ui-settings-item-hover-bg);
  border-color: var(--ui-settings-item-hover-border);
}
#settingsPanel .settings-item:hover {
  background: var(--ui-settings-item-hover-bg);
  border-color: var(--ui-settings-item-hover-border);
}
.settings-item-label {
  flex: 1 1 auto;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
}

/* Chat window */
#chatWindow {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px 18px 14px;
  overflow-y: scroll;
  scroll-behavior: smooth;
  background: var(--ui-chat-bg);
  scrollbar-gutter: stable;
}
#chatWindow::-webkit-scrollbar {
  width: 10px;
}
#chatWindow::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
}
.message {
  position: relative;
  max-width: min(760px, 88%);
  padding: 12px 14px 12px;
  border-radius: 18px;
  line-height: 1.55;
  word-break: break-word;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--ui-message-shadow);
  animation: rise 200ms ease-out;
  border-color: var(--ui-message-border);
}
.message::before {
  position: static;
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.66);
}
.message.user {
  align-self: flex-end;
  margin-left: auto;
  background: var(--ui-message-user-bg);
  color: var(--ui-message-user-fg);
  border-bottom-right-radius: 10px;
  white-space: pre-wrap;
  padding-left: 42px;
}
.message.user::before {
  content: "You";
  text-align: right;
}
.message.assistant {
  align-self: flex-start;
  margin-right: auto;
  background: var(--ui-message-assistant-bg);
  color: var(--ui-message-assistant-fg);
  border-bottom-left-radius: 10px;
  white-space: normal;
  padding-right: 42px;
}
.message.assistant::before {
  content: "COP Agentic AI";
  text-transform: none;
  letter-spacing: 0.06em;
  color: var(--ui-message-kicker);
}
.message.system {
  align-self: center;
  max-width: 90%;
  background: var(--ui-system-bg);
  color: var(--ui-system-fg);
}
.message .message-copy-button {
  position: absolute;
  top: 10px;
  width: 24px;
  height: 24px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.7);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease, color 120ms ease, opacity 120ms ease;
  opacity: 0.65;
}
.message.assistant .message-copy-button {
  right: 10px;
  border-color: var(--ui-copy-border);
  background: var(--ui-copy-bg);
  color: var(--ui-copy-fg);
}
.message.user .message-copy-button {
  left: 10px;
}
.message .message-copy-button:hover, .message .message-copy-button:focus-visible {
  opacity: 1;
  transform: translateY(-1px);
  border-color: rgba(125, 211, 252, 0.42);
  background: rgba(125, 211, 252, 0.12);
  color: var(--text);
  outline: none;
}
.message .message-copy-button svg {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.message .message-copy-button.copied {
  opacity: 1;
  border-color: rgba(103, 232, 213, 0.45);
  background: rgba(103, 232, 213, 0.14);
  color: #c8fff4;
}
.typing {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}
.typing span {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
  opacity: 0.5;
  animation: pulse 1.2s infinite ease-in-out;
  animation-fill-mode: both;
  will-change: transform, opacity;
}
.typing span:nth-child(2) {
  animation-delay: 0.15s;
}
.typing span:nth-child(3) {
  animation-delay: 0.3s;
}
.thinking-message {
  min-width: min(480px, 100%);
}
.thinking-shell {
  display: grid;
  gap: 12px;
}
.thinking-updates {
  display: grid;
  gap: 8px;
  margin-top: 2px;
}
.thinking-update {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}
.thinking-update.current {
  color: var(--ui-message-assistant-fg);
  font-weight: 600;
}


/* Markdown content */
.markdown {
  font-size: 14px;
  line-height: 1.6;
}
.markdown > :first-child {
  margin-top: 0;
}
.markdown > :last-child {
  margin-bottom: 0;
}
.md-paragraph, .markdown p {
  margin: 0 0 0.85em 0;
}
.md-heading {
  margin: 0 0 0.6em 0;
  line-height: 1.22;
  letter-spacing: -0.02em;
}
.md-heading-1 {
  font-size: 1.45em;
  font-weight: 800;
}
.md-heading-2 {
  font-size: 1.22em;
  font-weight: 750;
}
.md-heading-3 {
  font-size: 1.08em;
  font-weight: 700;
}
.md-list {
  margin: 0 0 0.85em 1.25em;
  padding: 0;
}
.md-list li {
  margin: 0.35em 0;
}
.markdown strong {
  font-weight: 800;
  color: var(--ui-text);
}
.markdown em {
  font-style: italic;
}
.markdown a {
  color: #9fd0ff;
  text-decoration: none;
  border-bottom: 1px solid rgba(159, 208, 255, 0.35);
}
.markdown a:hover {
  border-bottom-color: rgba(159, 208, 255, 0.8);
}
.md-codeblock {
  margin: 0 0 0.9em 0;
  padding: 12px 14px;
  overflow-x: auto;
  border-radius: 14px;
  background: rgba(2, 8, 20, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.md-codeblock code {
  display: block;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
  color: #e6eefc;
  white-space: pre;
}
.md-table-wrapper {
  margin: 0 0 0.9em 0;
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: transparent;
  border-color: var(--ui-surface-border);
}
.md-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 13px;
  line-height: 1.45;
}
.md-table th, .md-table td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  border: 1px solid rgba(255, 255, 255, 0.10);
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: normal;
  border-color: var(--ui-surface-border);
}
.md-table th {
  position: sticky;
  top: 0;
  background: #f8fafc;
  color: var(--ui-text);
  font-weight: 750;
  letter-spacing: 0.01em;
}
.md-table tbody tr:nth-child(odd) td {
  background: transparent;
}
.md-table code {
  font-size: 12px;
}

/* Composer */
.composer-shell {
  flex-shrink: 0;
  position: sticky;
  bottom: 0;
  z-index: 2;
  padding: 0 18px 16px;
  background: var(--ui-composer-shell-bg);
}
.composer-shell.is-busy {
  opacity: 0.72;
  filter: saturate(0.9);
}
.composer-shell.is-busy .composer {
  border-color: rgba(148, 163, 184, 0.42);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.035);
}
.composer-shell.is-busy .composer textarea, .composer-shell.is-busy .primary-button {
  cursor: wait;
}
.composer-shell.is-busy .primary-button {
  opacity: 0.72;
}
.composer-shell.is-busy .hint-row {
  color: #94a3b8;
}
.composer {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 12px;
  border-radius: 18px;
  border: 1px solid var(--ui-composer-border);
  background: var(--ui-composer-bg);
  box-shadow: var(--ui-composer-shadow);
  backdrop-filter: blur(18px);
}
.composer textarea {
  flex: 1;
  min-height: 46px;
  max-height: 120px;
  resize: none;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ui-composer-text);
  font: inherit;
  font-size: 14px;
  line-height: 1.5;
  padding: 10px 8px;
  overflow-y: auto;
}
.composer textarea::placeholder {
  color: var(--ui-composer-placeholder);
}
.composer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.composer button {
  border: none;
  cursor: pointer;
  font: inherit;
}
.primary-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 16px;
  background: linear-gradient(135deg, #2d6cff, #5da2ff);
  color: white;
  font-weight: 750;
  box-shadow: var(--ui-primary-shadow);
}
.primary-button:disabled {
  opacity: 0.6;
  cursor: wait;
}
.hint-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-top: 10px;
  color: var(--muted);
  font-family: inherit;
  font-size: 11px;
  line-height: 1.35;
}
.hint-row kbd {
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Topbar brand overrides */
.topbar .brand {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-width: 0;
  padding: 0;
}
.topbar .brand-mark {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  margin: 0;
  background: var(--ui-control-bg);
  border: 1px solid var(--ui-control-border);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
.topbar .brand-mark img {
  padding: 4px;
}
.topbar .brand-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}
.topbar .brand h1 {
  margin: 0;
  color: var(--ui-text);
  font-size: clamp(24px, 2vw, 34px);
  line-height: 1.02;
  letter-spacing: -0.05em;
  font-weight: 850;
}
.topbar .subtitle {
  margin: 0;
  color: var(--ui-muted);
  font-size: 11px;
  line-height: 1.4;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar #settingsButton, .topbar #themeButton {
  width: 48px;
  height: 48px;
  border-color: var(--ui-control-border);
  background: var(--ui-control-bg);
  color: var(--ui-control-fg);
}
.topbar #settingsButton svg, .topbar #themeButton svg {
  width: 20px;
  height: 20px;
}

/* Theme-specific refinements */
html[data-theme="dark"] .panel-title {
  color: var(--ui-muted);
}
html[data-theme="dark"] .session-search input {
  color: var(--ui-text);
}
html[data-theme="dark"] .session-search input::placeholder {
  color: var(--ui-session-search-placeholder);
}
html[data-theme="dark"] .panel-meta {
  color: var(--ui-muted);
}
html[data-theme="dark"] .session-title {
  color: var(--ui-text);
}
html[data-theme="dark"] .session-meta, html[data-theme="dark"] .subtle {
  color: var(--ui-muted);
}
html[data-theme="dark"] body {
  color: var(--ui-text);
  background: radial-gradient(circle at 18% 14%, rgba(125, 211, 252, 0.18), transparent 22%), radial-gradient(circle at 82% 10%, rgba(139, 157, 255, 0.18), transparent 20%), radial-gradient(circle at 50% 110%, rgba(103, 232, 213, 0.12), transparent 32%), linear-gradient(180deg, #05101c 0%, #0a1628 52%, #07111f 100%);
}
html[data-theme="dark"] body::before {
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.3), transparent 70%);
  opacity: 0.22;
}
html[data-theme="dark"] body::after {
  background: radial-gradient(circle at 50% 0%, rgba(125, 211, 252, 0.10), transparent 38%), radial-gradient(circle at 50% 100%, rgba(103, 232, 213, 0.09), transparent 42%);
  filter: blur(18px);
  opacity: 0.9;
}
html[data-theme="dark"] #container {
  background: rgba(6, 12, 22, 0.45);
}
html[data-theme="dark"] .sidebar {
  background: linear-gradient(180deg, rgba(8, 15, 28, 0.96), rgba(8, 15, 28, 0.78)), radial-gradient(circle at top, rgba(125, 211, 252, 0.12), transparent 36%);
  border-right-color: rgba(255, 255, 255, 0.08);
}
html[data-theme="dark"] .main {
  background: linear-gradient(180deg, rgba(6, 11, 20, 0.92), rgba(7, 13, 24, 0.96)), radial-gradient(circle at top right, rgba(125, 211, 252, 0.07), transparent 28%);
}
html[data-theme="dark"] .main::before {
  background-image: radial-gradient(circle at 1px 1px, rgba(125, 211, 252, 0.16) 1px, transparent 1.4px), radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.05) 1px, transparent 1.4px), radial-gradient(circle at 22% 12%, rgba(139, 157, 255, 0.10), transparent 26%), radial-gradient(circle at 78% 16%, rgba(103, 232, 213, 0.08), transparent 22%);
  opacity: 0.42;
}
html[data-theme="dark"] .topbar {
  background: rgba(8, 15, 27, 0.42);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}
html[data-theme="dark"] .topbar .brand-mark {
  background: linear-gradient(135deg, rgba(125, 211, 252, 0.26), rgba(139, 157, 255, 0.18));
  border-color: rgba(255, 255, 255, 0.12);
}
html[data-theme="dark"] .topbar .brand h1 {
  color: var(--ui-text);
}
html[data-theme="dark"] .topbar .subtitle {
  color: var(--ui-muted);
}
html[data-theme="dark"] .message {
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.20);
}
html[data-theme="dark"] .message.assistant::before {
  color: var(--ui-message-kicker);
}
html[data-theme="dark"] .message .message-copy-button {
  border-color: rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ui-copy-fg);
}
html[data-theme="dark"] .message .message-copy-button:hover, html[data-theme="dark"] .message .message-copy-button:focus-visible {
  border-color: rgba(125, 211, 252, 0.42);
  background: rgba(125, 211, 252, 0.12);
  color: var(--ui-control-fg);
}
html[data-theme="dark"] .message .message-copy-button.copied {
  border-color: rgba(103, 232, 213, 0.45);
  background: rgba(103, 232, 213, 0.14);
  color: #c8fff4;
}
html[data-theme="dark"] .markdown strong {
  color: var(--ui-text);
}
html[data-theme="dark"] .md-table-wrapper {
  background: rgba(2, 8, 20, 0.42);
  border-color: rgba(255, 255, 255, 0.08);
}
html[data-theme="dark"] .md-table th, html[data-theme="dark"] .md-table td {
  border-color: rgba(255, 255, 255, 0.10);
}
html[data-theme="dark"] .md-table th {
  background: rgba(14, 24, 44, 0.98);
  color: var(--ui-text);
}
html[data-theme="dark"] .md-table tbody tr:nth-child(odd) td {
  background: rgba(255, 255, 255, 0.02);
}
html[data-theme="dark"] .composer-shell {
  background: linear-gradient(180deg, rgba(6, 11, 20, 0.00), rgba(6, 11, 20, 0.22) 28%, rgba(6, 11, 20, 0.42));
}
html[data-theme="dark"] .composer {
  background: rgba(10, 18, 32, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.10);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.26);
}
html[data-theme="dark"] .composer-shell.is-busy {
  opacity: 0.72;
  filter: saturate(0.9);
}
html[data-theme="dark"] .composer-shell.is-busy .composer {
  border-color: rgba(148, 163, 184, 0.30);
  background: rgba(10, 18, 32, 0.84);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.22);
}
html[data-theme="dark"] .composer textarea {
  color: var(--ui-composer-text);
}
html[data-theme="dark"] .composer textarea::placeholder {
  color: var(--ui-session-search-placeholder);
}
html[data-theme="dark"] html[data-theme="dark"] .primary-button {
  box-shadow: 0 14px 24px rgba(45, 108, 255, 0.28);
}
html[data-theme="dark"] .settings-header {
  background: var(--ui-settings-header-bg);
}
html[data-theme="dark"] .settings-eyebrow {
  color: var(--ui-settings-eyebrow);
}
html[data-theme="dark"] .settings-copy {
  color: var(--ui-settings-copy);
}
html[data-theme="dark"] .settings-item {
  border-color: var(--ui-settings-item-border);
  background: var(--ui-settings-item-bg);
  color: var(--ui-settings-item-fg);
}
html[data-theme="dark"] .settings-item:hover {
  background: var(--ui-settings-item-hover-bg);
  border-color: var(--ui-settings-item-hover-border);
}
html[data-theme="dark"] html[data-theme="dark"] 
/* Miscellaneous */
.fade-in {
  animation: fadeIn 260ms ease-out;
}
.hint-row, .hint-row kbd {
  color: var(--ui-muted);
}
.message.assistant .message-copy-button:hover, .message.assistant .message-copy-button:focus-visible {
  border-color: #93c5fd;
  background: #eff6ff;
  color: var(--ui-control-fg);
}
.message.assistant .message-copy-button.copied {
  border-color: #86efac;
  background: #ecfdf5;
  color: #166534;
}
.session-list::-webkit-scrollbar, #chatWindow::-webkit-scrollbar {
  width: 10px;
}
.session-list::-webkit-scrollbar-track, #chatWindow::-webkit-scrollbar-track {
  background: transparent;
}
.session-list::-webkit-scrollbar-thumb, #chatWindow::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.28);
  border-radius: 999px;
}
.session-list::-webkit-scrollbar-thumb:hover, #chatWindow::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 116, 139, 0.42);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.99);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pulse {
  0%, 80%, 100% {
    transform: translateY(0);
    opacity: 0.45;
  }
  40% {
    transform: translateY(-4px);
    opacity: 1;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 980px) {
  #container {
    grid-template-columns: 1fr;
    height: auto;
    min-height: calc(100vh - 20px);
  }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 16px;
  }
  .main {
    min-height: 72vh;
  }
  .session-list {
    max-height: none;
  }
}

@media (max-width: 640px) {
  #container {
    width: 100vw;
    height: 100vh;
    margin: 0;
    border-radius: 0;
  }
  .sidebar, .topbar, #chatWindow, .composer-shell, #settingsPanel {
    padding-left: 16px;
    padding-right: 16px;
  }
  .message {
    max-width: 94%;
  }
  .composer {
    padding: 9px;
    border-radius: 20px;
  }
  .composer textarea {
    min-height: 42px;
  }
  .sidebar {
    padding-left: 14px;
    padding-right: 14px;
  }
  .brand {
    align-items: flex-start;
    gap: 12px;
  }
  .brand-mark {
    width: 48px;
    height: 48px;
  }
  .session-list {
    max-height: none;
  }
  .sessions-panel {
    padding: 14px;
  }
}