/* The default has no data-sb-theme attribute and retains the existing blue/green UI. */
:root[data-sb-theme="smoke-purple"] { --sb-accent: #716b7b; --sb-tint: #f4f2f6; }
:root[data-sb-theme="graphite"] { --sb-accent: #53565a; --sb-tint: #f2f2f2; }
:root[data-sb-theme="mist-blue"] { --sb-accent: #586b7b; --sb-tint: #f1f4f6; }
:root[data-sb-theme="dusty-rose"] { --sb-accent: #806b6f; --sb-tint: #f6f2f3; }
:root[data-sb-theme="celadon"] { --sb-accent: #5a7473; --sb-tint: #f0f5f4; }
:root[data-sb-theme="silver"] { --sb-accent: #69747c; --sb-tint: #f2f4f5; }
:root[data-sb-theme="monochrome"] { --sb-accent: #202020; --sb-tint: #ededed; }
:root[data-sb-theme] {
  --ink: #2d3034; --muted: #747980; --line: #e5e6e8; --soft: #fafafa; --panel: #fff;
  --green: var(--sb-accent); --teal: var(--sb-accent); --blue: var(--sb-accent);
  --shadow: 0 12px 36px #22222206;
}
:root[data-sb-theme] body { background: #fff; }
:root[data-sb-theme] :is(.sidebar, .page-header, .side-section, .card, .profile-card, .composer, .quick-prompts) { background: #fff; }
:root[data-sb-theme] :is(.brand-mark, .nav-card > span) { background: var(--sb-accent); color: #fff; }
:root[data-sb-theme] .nav-card:not(.active) > span { background: var(--sb-tint); color: var(--sb-accent); }
:root[data-sb-theme] .profile-card::before { background: var(--sb-accent); }
:root[data-sb-theme] .cover { background-color: var(--sb-tint); background-image: none; }
:root[data-sb-theme] .cover b { background: var(--sb-accent); }
:root[data-sb-theme] :is(.profile-card.active, .nav-card.active, .course-item.active, .friend-row.active, .tools-tabs .active) { background: var(--sb-tint); border-color: var(--sb-accent); }
:root[data-sb-theme] :is(.brand-row span, .page-header span, .section-title span, .profile-card-arrow, .profile-id strong) { color: var(--sb-accent); }
:root[data-sb-theme] :is(label, .message, .message strong, .community-post .formatted-text, .creative-workspace) { color: var(--ink); }
:root[data-sb-theme] .deadline-banner { background: #fff; border-color: var(--line); }
:root[data-sb-theme] .deadline-banner span { color: var(--sb-accent); }
:root[data-sb-theme] .deadline-banner > strong { background: var(--sb-tint); color: var(--sb-accent); }
:root[data-sb-theme] .message.ai > div { background: #fafafa; border-color: var(--line); border-left-color: var(--sb-accent); }
:root[data-sb-theme] .message.user > div { background: var(--sb-tint); border-color: var(--line); }
:root[data-sb-theme] .message > b { background: var(--sb-tint); color: var(--sb-accent); }
:root[data-sb-theme] :is(.message .markdown-table th, .markdown-table th, .community-tabs, .community-destination, .community-channel-badge, .community-topic-hints span, .creative-preview, .creative-empty) { background: #f5f5f5; }
:root[data-sb-theme] :is(.markdown-table th, .markdown-table td, .message .markdown-table th, .message .markdown-table td, .quick-prompts button, .chat-image, .chat-file) { border-color: var(--line); }
:root[data-sb-theme] :is(.markdown-table tr:nth-child(even) td, .message .markdown-table tr:nth-child(even) td) { background: #fafafa; }
:root[data-sb-theme] .send { background: var(--sb-accent); border-color: var(--sb-accent); color: #fff; }
:root[data-sb-theme] :is(.composer.drop-ready, .side-section.drop-ready, .creative-history-item.selected) { background: var(--sb-tint); }
:root[data-sb-theme] :is(.reply-status, .creative-course-label, .creative-history-item small, .creative-result-status, .creative-download small) { color: var(--muted); }
:root[data-sb-theme] .reply-spinner { border-color: var(--line); border-top-color: var(--sb-accent); }
:root[data-sb-theme] :is(.classmate-avatar, .community-avatar, .community-empty-icon, .community-compose-heading > span, .community-like.is-liked, .community-picker-row > button) { background: var(--sb-tint); color: var(--sb-accent); }
:root[data-sb-theme] :is(.community-tabs button.active, .community-tabs button:hover, .community-picker-hint > button, .community-empty > button, .creative-download, .creative-revision) { color: var(--sb-accent); }
:root[data-sb-theme] :is(.community-empty, .classmates-workspace .chat-panel, .classmates-workspace .dm-list) { background: #fff; }
:root[data-sb-theme] :is(.community-empty > button, .community-tabs button.active, .creative-history-item.selected) { border-color: var(--sb-accent); }
:root[data-sb-theme] .classmates-workspace .dm.mine { background: var(--sb-tint); border-color: var(--line); }
:root[data-sb-theme] .peer-profile-cover { background-color: var(--sb-tint); }
:root[data-sb-theme] :is(.profile-card:focus-visible, .profile-editor button:focus-visible, .community-layout input:focus-visible, .community-layout textarea:focus-visible, .community-layout button:focus-visible, .creative-upload:focus-within) { outline-color: var(--sb-accent); }
:root[data-sb-theme] input[type="checkbox"] { accent-color: var(--sb-accent); }
:root[data-sb-theme] .reply-content a { color: var(--sb-accent); }
:root[data-sb-theme] :is(.schedule-upload, .schedule-draft) { background: #fff; border-color: var(--line); }
:root[data-sb-theme] :is(.schedule-file-picker, .schedule-file-picker:hover, .schedule-file-picker:focus-within) { border-color: var(--line); background: #fafafa; }
:root[data-sb-theme] .schedule-file-picker:focus-within { outline-color: var(--sb-accent); }
:root[data-sb-theme] :is(.schedule-steps b, .schedule-file-symbol, .schedule-import-status, .schedule-type-legend span, .schedule-empty > span) { background: var(--sb-tint); color: var(--sb-accent); border-color: var(--line); }
:root[data-sb-theme] :is(.schedule-empty b, .schedule-steps) { color: var(--muted); }
/* Only editor chrome is themed; authored document/slide/cell colors stay intact. */
:root[data-sb-theme] :is(.office-toolbar, .office-ai, .office-ai-inline, .office-statusbar, .office-page-settings) { background: #fafafa; }
:root[data-sb-theme] :is(.office-shell button[aria-pressed="true"], .office-view-switch button[aria-pressed="true"], .office-thumbnails button.selected, .office-ai-change > div:last-child) { background: var(--sb-tint); border-color: var(--sb-accent); color: var(--sb-accent); }
:root[data-sb-theme] :is(.office-ai-compose > button, .office-ai-preview-actions > button:first-child:not(:last-child)) { background: var(--sb-accent); border-color: var(--sb-accent); color: #fff; }
:root[data-sb-theme] .office-ai-inline h3 { color: var(--sb-accent); }
:root[data-sb-theme] :is(.office-shell label, .office-statusbar, .office-page-settings, .office-ai-heading > span, .office-ai-change small) { color: var(--muted); }

.settings-dialog { width: min(1060px, calc(100% - 32px)); max-width: calc(100% - 32px); max-height: calc(100dvh - 32px); box-sizing: border-box; overflow: hidden; padding: 0; border: 1px solid var(--line); border-radius: 16px; color: var(--ink); background: #fff; box-shadow: 0 24px 90px #17232c26; }
.settings-dialog::backdrop { background: #18222b66; }
.settings-dialog *, .settings-dialog *::before { box-sizing: border-box; }
.settings-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 24px; border-bottom: 1px solid var(--line); }
.settings-heading h2 { margin: 0; font-size: 21px; font-weight: 600; }
.settings-heading h2 span { margin-left: 8px; font-size: 13px; font-weight: 400; color: var(--muted); }
.settings-heading .settings-close { flex: 0 0 36px; width: 36px; height: 36px; padding: 0; font-size: 24px; font-weight: 400; }
.settings-layout { display: grid; grid-template-columns: 238px minmax(0, 1fr); height: min(680px, calc(100dvh - 134px)); min-height: 0; }
.settings-sidebar { min-width: 0; display: flex; flex-direction: column; background: #fafafa; padding: 22px 14px 16px; border-right: 1px solid var(--line); overflow-y: auto; }
.settings-account-summary { display: flex; align-items: center; gap: 10px; padding: 0 8px 22px; }
.settings-account-summary > div { min-width: 0; }
.settings-account-avatar { display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--line); background: #fff; color: var(--green); border-radius: 12px; flex: 0 0 auto; }
.settings-account-name { display: block; font-size: 13px; font-weight: 600; overflow-wrap: anywhere; }
.settings-account-email { display: block; margin-top: 3px; font-size: 10px; color: var(--muted); overflow-wrap: anywhere; }
.settings-nav { display: grid; gap: 5px; }
.settings-nav-group { padding: 15px 10px 5px; color: var(--muted); font-size: 10px; }
.settings-nav-group:first-child { padding-top: 0; }
.settings-nav button { width: 100%; display: flex; align-items: center; gap: 10px; text-align: left; padding: 10px; border: 1px solid transparent; background: transparent; font-size: 13px; font-weight: 500; min-width: 0; }
.settings-nav button > span:nth-child(2) { min-width: 0; }
.settings-nav button small { display: block; margin-top: 3px; font-size: 10px; font-weight: 400; color: var(--muted); }
.settings-nav button:hover { border-color: transparent; background: #f1f2f2; }
.settings-nav button[aria-current="page"] { background: var(--sb-tint, #edf5f1); color: var(--green); }
.settings-nav-icon { display: grid; place-items: center; width: 26px; height: 26px; font-size: 19px; color: var(--green); flex-shrink: 0; }
.settings-nav-arrow { margin-left: auto; font-size: 18px; font-weight: 400; color: var(--muted); }
.settings-content { min-width: 0; min-height: 0; padding: 30px 34px; overflow-y: auto; overscroll-behavior: contain; }
.settings-panel { min-width: 0; }
.settings-panel-heading { margin-bottom: 28px; }
.settings-eyebrow { display: block; color: var(--muted); font-size: 9px; letter-spacing: 1.6px; margin-bottom: 12px; }
.settings-panel-heading h3 { margin: 0; font-size: 26px; font-weight: 600; letter-spacing: -.5px; }
.settings-panel-heading p { font-size: 12px; line-height: 1.8; color: var(--muted); margin: 9px 0 0; }
.settings-block { margin-bottom: 22px; padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.settings-block h4 { margin: 0 0 18px; font-size: 13px; font-weight: 600; }
.settings-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 14px; }
.settings-fields label, .settings-instruction-label { display: grid; gap: 7px; min-width: 0; font-size: 12px; font-weight: 400; color: var(--muted); }
.settings-fields input { min-width: 0; padding: 10px 12px; font-size: 13px; color: var(--ink); }
.settings-dialog .settings-caption { margin: 13px 0 0; color: var(--muted); font-size: 11px; line-height: 1.8; overflow-wrap: anywhere; }
.settings-form-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 18px; }
.settings-profile-status { font-size: 11px; color: var(--muted); overflow-wrap: anywhere; }
.settings-dialog .settings-primary { background: var(--green); color: #fff; border-color: var(--green); padding: 9px 14px; font-size: 12px; flex-shrink: 0; }
.settings-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 0; border-top: 1px solid var(--line); }
.settings-row:nth-child(2) { border-top: 0; padding-top: 0; }
.settings-row:last-child { padding-bottom: 0; }
.settings-row > div { min-width: 0; }
.settings-row strong, .settings-toggle-row strong { display: block; font-size: 12px; font-weight: 500; }
.settings-row small, .settings-toggle-row small { display: block; margin-top: 5px; font-size: 11px; line-height: 1.7; color: var(--muted); overflow-wrap: anywhere; }
.settings-row button { flex-shrink: 0; font-size: 11px; padding: 7px 10px; font-weight: 500; }
.settings-static-value { font-size: 10px; color: var(--muted); text-align: right; flex-shrink: 0; }
.settings-toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 16px 0; border-top: 1px solid var(--line); color: var(--ink); }
.settings-toggle-row:nth-child(2) { border-top: 0; padding-top: 0; }
.settings-toggle-row:last-child { padding-bottom: 0; }
.settings-toggle-row input { appearance: none; position: relative; width: 38px; height: 22px; min-height: 22px; border: 0; border-radius: 20px; background: #c5c9cd; padding: 0; flex: 0 0 auto; cursor: pointer; }
.settings-toggle-row input::before { content: ""; position: absolute; left: 3px; top: 3px; width: 16px; height: 16px; border-radius: 50%; background: #fff; }
.settings-toggle-row input:checked { background: var(--green); }
.settings-toggle-row input:checked::before { transform: translateX(16px); }
.settings-toggle-row input:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
.settings-instruction-label textarea { min-height: 128px; padding: 12px; color: var(--ink); font-size: 13px; line-height: 1.8; }
.settings-themes { min-width: 0; border: 0; margin: 0; padding: 0; }
.settings-themes legend { padding: 0; font-size: 15px; font-weight: 600; }
.settings-themes > p { margin: 8px 0 18px; font-size: 12px; color: var(--muted); line-height: 1.7; }
.settings-theme-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.settings-theme-option { display: grid; grid-template-columns: 16px 40px minmax(0, 1fr); align-items: center; gap: 10px; padding: 15px 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); cursor: pointer; }
.settings-theme-option:has(input:checked) { border-color: var(--green); background: var(--sb-tint, #f4f9f6); }
.settings-theme-option:focus-within { outline: 2px solid var(--green); outline-offset: 2px; }
.settings-theme-option input { width: 16px; height: 16px; margin: 0; padding: 0; accent-color: var(--green); }
.settings-theme-sample { display: grid; grid-template-columns: 1fr 1fr 1fr; height: 30px; overflow: hidden; border: 1px solid #dedfe0; border-radius: 6px; }
.settings-theme-sample i:nth-child(1) { background: #fff; }
.settings-theme-sample i:nth-child(2) { background: var(--sample-tint); }
.settings-theme-sample i:nth-child(3) { background: var(--sample-accent); }
.settings-theme-name { min-width: 0; font-size: 13px; font-weight: 500; }
.settings-theme-name small { display: block; margin-top: 3px; font-size: 11px; font-weight: 400; color: var(--muted); }
.settings-save-row { min-height: 40px; display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; }
.settings-save-status { font-size: 12px; color: var(--muted); }
.settings-save-status.is-error { color: var(--danger); }
.settings-dialog .settings-retry { padding: 5px 10px; font-size: 12px; flex-shrink: 0; }
.settings-dialog [hidden] { display: none !important; }
.settings-footer { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; border-top: 1px solid var(--line); padding: 18px 4px 0; font-size: 10px; color: var(--muted); }
.settings-footer > span { padding-right: 5px; }
.settings-footer small { display: block; margin-top: 3px; font-size: 9px; }
.settings-footer .settings-logout { color: var(--danger); border-color: var(--line); background: #fff; font-size: 11px; padding: 7px 9px; font-weight: 500; flex-shrink: 0; }
.settings-dialog .settings-learning-retry { padding: 5px 10px; font-size: 12px; flex-shrink: 0; }
.settings-dialog .settings-export { font-size: 12px; padding: 9px 14px; margin-top: 16px; }
.settings-dialog .is-error { color: var(--danger); }
.settings-help { border-top: 1px solid var(--line); padding: 15px 0; font-size: 12px; }
.settings-help:nth-child(2) { border-top: 0; padding-top: 0; }
.settings-help:last-child { padding-bottom: 0; }
.settings-help summary { cursor: pointer; font-weight: 500; line-height: 1.8; }
.settings-help p { color: var(--muted); font-size: 12px; line-height: 1.9; margin: 10px 0 0; }
.settings-back { display: none; }
@media (min-width: 701px) and (max-width: 1000px) {
  .settings-layout { grid-template-columns: 210px minmax(0, 1fr); }
  .settings-content { padding: 26px 22px; }
  .settings-theme-option { grid-template-columns: 16px minmax(0, 1fr); }
  .settings-theme-sample { display: none; }
}
@media (max-width: 700px) {
  .settings-dialog { width: calc(100% - 24px); max-width: calc(100% - 24px); height: calc(100dvh - 24px); max-height: calc(100dvh - 24px); border-radius: 14px; }
  .settings-heading { padding: 14px 18px; }
  .settings-layout { display: block; height: calc(100% - 65px); }
  .settings-sidebar { height: 100%; padding: 24px 16px 20px; border-right: 0; }
  .settings-content { display: none; height: 100%; padding: 18px 16px 28px; }
  .settings-dialog[data-detail="true"] .settings-sidebar { display: none; }
  .settings-dialog[data-detail="true"] .settings-content { display: block; }
  .settings-back { display: inline-block; padding: 6px 0; margin-bottom: 22px; background: transparent; border: 0; color: var(--green); font-size: 12px; }
  .settings-account-summary { padding-bottom: 25px; }
  .settings-account-name { font-size: 16px; }
  .settings-account-email { font-size: 12px; }
  .settings-nav { gap: 7px; }
  .settings-nav button { padding: 13px 10px; font-size: 14px; background: #fff; border-color: var(--line); border-radius: 10px; }
  .settings-nav button small { font-size: 11px; }
  .settings-nav-group { font-size: 11px; padding-top: 18px; }
  .settings-footer { margin-top: 26px; }
  .settings-panel-heading h3 { font-size: 24px; }
  .settings-panel-heading { margin-bottom: 24px; }
  .settings-eyebrow { font-size: 8px; }
  .settings-block { padding: 18px 14px; }
  .settings-fields, .settings-theme-grid { grid-template-columns: minmax(0, 1fr); }
  .settings-fields input, .settings-instruction-label textarea { font-size: 16px; }
  .settings-row { gap: 10px; }
  .settings-row button { font-size: 10px; padding: 7px 8px; }
  .settings-row small { font-size: 10px; }
}
@media (pointer: coarse) { .settings-dialog button { min-height: 44px; } }

/* Neutral daytime chrome; leave semantic status/calendar colors and authored content intact. */
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) {
  --ink: #202020;
  --muted: #686868;
  --line: #d2d2d2;
  --soft: #f5f5f5;
  --panel: #ffffff;
  --shadow: 0 10px 28px #20202008;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(body, .workspace, .study-workspace .chat-area) {
  background: #f4f4f4;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.sidebar, .page-header, .side-section, .card, .profile-card, .composer, .quick-prompts, .settings-dialog, .settings-block, .community-post, .community-composer-card, .community-feed-status, .community-channel-picker, .community-notifications) {
  background: #ffffff;
  border-color: var(--line);
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) .card {
  box-shadow: var(--shadow);
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.primary, .send, .settings-primary) {
  background: #202020;
  border-color: #202020;
  color: #ffffff;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.primary, .send, .settings-primary):hover {
  background: #3b3b3b;
  border-color: #3b3b3b;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.settings-sidebar, .settings-nav button:hover, .community-reply, .community-like, .community-compose-footer, .profile-editor input) {
  background: #f7f7f7;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) .settings-dialog::backdrop {
  background: #20202066;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.community-tabs, .community-tabs button.active, .community-picker-row > button, .community-compose-footer, .community-post footer, .community-composer-card input, .community-composer-card textarea, .classmates-workspace .chat-placeholder, .creative-result, .creative-icon, .creative-upload, .creative-download, .creative-history-heading, .creative-history-item, .creative-preview, .creative-empty) {
  border-color: var(--line);
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.community-tabs button.active, .segmented .active) {
  box-shadow: none;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.community-composer-card input, .community-composer-card textarea)::placeholder {
  color: #858585;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) .profile-editor input:focus-visible {
  box-shadow: 0 0 0 3px #20202014;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) .profile-uploads input::file-selector-button {
  background: #ededed;
  color: #202020;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.office-doc-scroll, .office-slide-work, .office-thumbnails) {
  background: #ededed;
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) :is(.office-ai p, .office-ai-shortcuts > span, .office-inspector p, .office-thumbnails small, .office-formula-bar b) {
  color: var(--muted);
}
:root[data-sb-theme="monochrome"]:not([data-sb-mode="dark"]) .office-grid th {
  background: #ededed;
  color: #686868;
}

/* Passwords are submitted explicitly and never included in settings auto-saves. */
.settings-password-fields { border: 0; min-width: 0; padding: 0; margin: 16px 0 0; display: grid; gap: 14px; }
.settings-password-fields label { display: grid; gap: 7px; min-width: 0; font-size: 12px; color: var(--muted); }
.settings-password-fields input { min-width: 0; width: 100%; font-size: 14px; padding: 10px 12px; }
.settings-password-fields:disabled { opacity: .6; }
.settings-password-save-status { font-size: 11px; color: var(--muted); line-height: 1.7; overflow-wrap: anywhere; }
.settings-password-fields .settings-caption { margin-top: 0; }
.settings-google-reauth { display: inline-block; margin-top: 14px; color: var(--green); font-size: 12px; }
.settings-security-retry, .settings-password-reset { margin-top: 14px; }
@media (max-width: 700px) {
  .settings-password-fields input { font-size: 16px; }
  .settings-password-form .settings-form-actions { align-items: flex-start; flex-direction: column; }
}