/* apex chat layout (unlayered — always wins over the layered theme bundle) */
:root { --apex-sidebar-w: 300px; }
* { box-sizing: border-box; }
body { min-height: 100vh; background: radial-gradient(1200px 600px at 10% -10%, color-mix(in srgb, var(--hig-color-tint) 16%, transparent), transparent 55%), radial-gradient(900px 500px at 100% 0%, color-mix(in srgb, var(--hig-palette-indigo) 12%, transparent), transparent 50%), var(--hig-color-system-background); }
button, textarea, input { font: inherit; }
.shell { display: grid; grid-template-columns: var(--apex-sidebar-w) minmax(0, 1fr); min-height: 100vh; position: relative; }
.sidebar { border-right: var(--hig-hairline) solid var(--hig-color-separator); min-height: 100vh; background: var(--liquid-glass-surface-regular-tint); -webkit-backdrop-filter: blur(var(--liquid-glass-surface-regular-blur)) saturate(var(--liquid-glass-surface-regular-saturate)); backdrop-filter: blur(var(--liquid-glass-surface-regular-blur)) saturate(var(--liquid-glass-surface-regular-saturate)); z-index: 30; padding: 14px 12px; gap: 10px; display: flex; flex-direction: column; }
.sidebar-header { display: flex; gap: 8px; align-items: center; }
.new-chat-btn { flex: 1; }
.sidebar-close { display: none; }
.sidebar-search { margin: 2px 0 4px; }
.conversation-list { flex: 1; overflow: auto; min-height: 0; }
.conv-row { cursor: pointer; }
.conv-row.is-active { background: color-mix(in srgb, var(--hig-color-tint) 12%, transparent); }
.conv-row-main { min-width: 0; }
.conv-title { font-weight: 650; font-size: var(--hig-text-footnote-font-size); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv-meta { opacity: 0.7; margin-top: 2px; }
.conv-delete { opacity: 0.55; }
.conv-delete:hover { opacity: 1; }
.brand { margin-top: auto; padding-top: 8px; }
.brand-body { font-size: var(--hig-text-caption1-font-size); line-height: 1.45; opacity: 0.9; }
.brand-body p { margin: 0 0 0.5em; }
.brand-name { font-weight: 700; opacity: 1; }
.privacy-disclosure { font-size: var(--hig-text-footnote-font-size); }
.main { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; min-width: 0; min-height: 100vh; }
.topbar-nav { position: sticky; top: 0; z-index: 10; border-radius: 0 !important; border-left: 0 !important; border-right: 0 !important; }
.topbar-titles { display: flex; flex-direction: column; align-items: center; gap: 2px; min-width: 0; }
.topbar-title { font-weight: 700; font-size: var(--hig-text-subheadline-font-size); letter-spacing: -0.01em; }
.topbar-sub { opacity: 0.7; }
.topbar-trailing { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.menu-btn { display: none; }
.capabilities { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.capability-chip { font-size: var(--hig-text-caption2-font-size); }
.thread { overflow: auto; padding: 18px 16px 8px; }
.empty-state { max-width: 640px; margin: 10vh auto 0; text-align: center; padding: 16px; }
.empty-avatar { width: 56px !important; height: 56px !important; font-size: var(--hig-text-title3-font-size) !important; margin-bottom: 12px; }
.empty-state h2 { margin: 0 0 8px; letter-spacing: -0.02em; }
.empty-state p { margin: 0 0 16px; opacity: 0.75; }
.empty-state .capabilities { justify-content: center; margin-bottom: 14px; }
.suggestions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 8px; }
.suggestion-btn { font-size: var(--hig-text-footnote-font-size); }
.message { display: flex; justify-content: center; padding: 12px 0; }
.message-inner { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 12px; width: min(760px, 100%); }
.avatar-user { background: color-mix(in srgb, var(--hig-color-tint) 18%, transparent); }
.message-body { min-width: 0; }
.role-label { font-weight: 650; opacity: 0.7; margin-bottom: 6px; }
.bubble-panel { padding: 12px 14px; line-height: 1.55; word-wrap: break-word; }
.plain { white-space: pre-wrap; }
.message.is-error .bubble-panel { outline: 1px solid color-mix(in srgb, var(--hig-palette-red) 45%, transparent); }
.stopped-note { margin-top: 8px; font-size: var(--hig-text-caption1-font-size); opacity: 0.65; font-style: italic; }
.msg-attachments { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.message-actions { margin-top: 8px; display: flex; gap: 6px; }
.msg-action { font-size: var(--hig-text-caption1-font-size); padding: 4px 10px !important; min-height: 0 !important; }
.md { display: block; }
.md p { margin: 0 0 0.75em; }
.md p:last-child { margin-bottom: 0; }
.md h1, .md h2, .md h3, .md h4 { margin: 0.9em 0 0.4em; line-height: 1.25; letter-spacing: -0.01em; }
.md h1 { font-size: 1.35em; }
.md h2 { font-size: 1.18em; }
.md h3 { font-size: 1.05em; }
.md ul, .md ol { margin: 0.4em 0 0.8em; padding-left: 1.3em; }
.md li { margin: 0.2em 0; }
.code-block { margin: 0.7em 0; padding: 10px 12px; border-radius: var(--hig-radius-md); overflow: auto; line-height: 1.5; }
.code-lang { font-size: var(--hig-text-caption2-font-size); text-transform: uppercase; letter-spacing: 0.04em; color: var(--hig-color-secondary-label); margin-bottom: 6px; }
.code-block code { font: inherit; white-space: pre; background: transparent; padding: 0; }
.typing { display: inline-flex; align-items: center; gap: 10px; padding: 10px 4px; }
.typing-label { opacity: 0.7; }
.stream-caret { display: inline-block; margin-left: 2px; animation: apex-blink 1s step-end infinite; }
.composer { padding: 10px 16px 18px; background: linear-gradient(180deg, transparent 0%, color-mix(in srgb, var(--hig-color-system-background) 85%, transparent) 30%); }
.composer-shell { align-items: end; box-shadow: var(--liquid-glass-elevation-overlay-shadow); background: var(--liquid-glass-surface-regular-tint); -webkit-backdrop-filter: blur(var(--liquid-glass-surface-thick-blur)) saturate(var(--liquid-glass-surface-thick-saturate)); max-width: 760px; backdrop-filter: blur(var(--liquid-glass-surface-thick-blur)) saturate(var(--liquid-glass-surface-thick-saturate)); padding: 10px; gap: 8px; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; border: 1px solid var(--liquid-glass-surface-regular-border); border-radius: var(--hig-radius-lg); margin: 0 auto; }
.composer-input { min-width: 0; }
.composer-input textarea { line-height: 1.45; max-height: 180px; color: inherit; min-height: 44px; width: 100%; background: transparent; resize: none; padding: 10px 6px; outline: none; border: 0; }
.send-btn { min-width: 44px; align-self: end; }
.file-input { display: none; }
.attach-btn { align-self: end; }
.attachment-chips { display: flex; flex-wrap: wrap; gap: 8px; max-width: 760px; margin: 0 auto 8px; }
.composer-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; max-width: 760px; margin: 10px auto 0; padding: 0 4px; }
.composer-hint { opacity: 0.65; }
.model-picker { position: relative; }
.model-trigger { font-size: var(--hig-text-caption1-font-size); }
.model-menu { bottom: calc(100% + 8px); left: 0; min-width: 260px; z-index: 20; }
.agent-toggle { position: relative; }
.agent-trigger { font-size: var(--hig-text-caption1-font-size); }
.agent-trigger.is-on { color: var(--hig-color-accent); font-weight: 600; }
.agent-trace { margin-top: 8px; opacity: 0.7; font-variant-numeric: tabular-nums; }
@keyframes apex-blink { 0% { opacity: 1; } 50% { opacity: 0; } 100% { opacity: 1; } }
@media (max-width: 760px) { .shell { grid-template-columns: 1fr; } .menu-btn { display: inline-flex; } .sidebar { position: fixed; inset: 0 auto 0 0; width: min(88vw, var(--apex-sidebar-w)); transform: translateX(-105%); transition: transform 180ms ease; box-shadow: var(--liquid-glass-elevation-floating-shadow); } .sidebar.is-open { transform: translateX(0); } .sidebar-close { display: inline-flex; } .sidebar-scrim { z-index: 20; } .topbar-trailing .capabilities { display: none; } .composer-hint { display: none; } .message-inner { grid-template-columns: 34px minmax(0, 1fr); gap: 10px; } }
@media (prefers-reduced-motion: reduce) { .sidebar { transition: none; } .stream-caret { animation: none; } }