/* Cert Buddy's original navy/blue/violet/teal identity, requested by Roger. */
:root, html[data-theme="dark"], html[data-theme="light"] {
  color-scheme: dark;
  --cp-bg: #0b1020;
  --cp-bg-elevated: #0f1730;
  --cp-surface: #131c38;
  --cp-surface-soft: #172347;
  --cp-border: #23305c;
  --cp-border-strong: #586da0;
  --cp-text: #eaf0ff;
  --cp-text-muted: #9fb0d8;
  --cp-text-soft: #c3cdec;
  --cp-accent: #7c9fff;
  --cp-accent-hover: #96b2ff;
  --cp-accent-soft: rgba(91, 140, 255, 0.16);
  --cp-accent-fg: #08122b;
  --cp-success: #46d39a;
  --cp-danger: #ffbf69;
  --cp-warning: #fbd38d;
  --cp-link: #33d6c8;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  --cp-overlay: rgba(4, 7, 16, 0.8);
  --cp-panel: rgba(15, 23, 48, 0.72);
  --cp-panel-strong: rgba(15, 23, 48, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.04);
  --cp-highlight: rgba(91, 140, 255, 0.18);
  --cp-brand-blue: #5b8cff;
  --cp-brand-violet: #8a6bff;
  --cp-brand-teal: #33d6c8;
  --cp-brand-gradient: linear-gradient(120deg, var(--cp-brand-blue), var(--cp-brand-violet) 55%, var(--cp-brand-teal) 120%);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--cp-bg); color: var(--cp-text); font: 15px/1.55 "Segoe UI", Aptos, Calibri, -apple-system, BlinkMacSystemFont, sans-serif; }
button, input, select, textarea { font: inherit; }
button, .button-link { min-height: 44px; padding: 8px 12px; border: 1px solid var(--cp-border); border-radius: .625rem; background: var(--cp-surface); color: var(--cp-text); cursor: pointer; }
button:hover:not(:disabled), .button-link:hover { background: var(--cp-accent-soft); border-color: var(--cp-accent); }
button:disabled { opacity: .55; cursor: not-allowed; }
button.primary, .button-link { background: var(--cp-brand-gradient); color: var(--cp-accent-fg); border-color: var(--cp-accent); font-weight: 700; }
button.primary:hover:not(:disabled), .button-link:hover { background: var(--cp-accent-hover); color: var(--cp-accent-fg); }
a { color: var(--cp-link); overflow-wrap: anywhere; }
a[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--cp-accent); outline-offset: 3px; }
input, select, textarea { padding: 10px 12px; color: var(--cp-text); background: var(--cp-surface); border: 1px solid var(--cp-border-strong); border-radius: .625rem; min-width: 0; max-width: 100%; }
input:disabled, select:disabled, textarea:disabled { background: var(--cp-surface-soft); }
label { display: block; margin: 12px 0 4px; font-weight: 600; }
h1, h2, h3 { line-height: 1.3; }
h1 { font-size: 1.25rem; margin: 0; overflow-wrap: anywhere; }
h2 { font-size: 1.05rem; }
h3 { font-size: 1rem; }
p { margin: 8px 0; }
.small { color: var(--cp-text-muted); font-size: .8rem; }
.error { color: var(--cp-danger); min-height: 1.5em; overflow-wrap: anywhere; }
.error:empty { min-height: 0; margin: 0; }
.skip-link { position: fixed; top: -100px; left: 12px; z-index: 100; padding: 12px; background: var(--cp-surface); }
.skip-link:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.app { display: grid; grid-template-columns: 216px minmax(0, 1fr); height: 100vh; height: 100dvh; overflow: hidden; }
.sidebar { display: flex; flex-direction: column; background: var(--cp-bg-elevated); border-right: 1px solid var(--cp-border); min-width: 0; min-height: 0; padding: 14px 10px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; }
.logo { display: grid; place-items: center; flex: none; width: 36px; height: 36px; border-radius: .625rem; font-weight: 800; background: var(--cp-brand-gradient); color: var(--cp-accent-fg); box-shadow: 0 6px 20px var(--cp-highlight); }
.side-label { font-size: .85rem; margin: 4px 0 0; color: var(--cp-text-muted); }
.convos { flex: 1; overflow-y: auto; min-height: 60px; }
.convo { display: flex; align-items: center; gap: 4px; margin: 4px 0; border-radius: .625rem; }
.convo.active { background: var(--cp-accent-soft); outline: 1px solid var(--cp-accent); }
.convo-open { flex: 1; min-width: 0; text-align: left; background: var(--cp-bg-elevated); border: 0; }
.convo.active .convo-open { background: var(--cp-accent-soft); }
.convo-title { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.convo-meta { display: block; font-size: .75rem; color: var(--cp-text-muted); }
.convo-delete { flex: none; color: var(--cp-text-muted); padding: 6px 10px; }
.side-foot { border-top: 1px solid var(--cp-border); padding-top: 12px; overflow-wrap: anywhere; }
.side-foot a { display: inline-block; margin: 8px; font-size: .85rem; }
.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.topbar { height: 64px; flex: 0 0 64px; padding: 8px 20px; border-bottom: 1px solid var(--cp-border); background: var(--cp-bg); display: flex; align-items: center; gap: 12px; }
.heading { flex: 1; min-width: 0; }
.heading h1 { font-size: 1rem; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.heading p { margin: 0; font-size: .75rem; color: var(--cp-brand-teal); }
.toolbar, .mobile-nav, .recovery { display: flex; flex-wrap: wrap; gap: 8px; }
.mobile-nav { display: none; min-width: 44px; }
.toolbar { align-items: center; flex-wrap: nowrap; }
.toolbar button { font-size: .85rem; white-space: nowrap; }
.study-toolbar { display: flex; flex-wrap: wrap; flex: none; align-items: center; gap: 4px 6px; padding: 4px 20px; border-bottom: 1px solid var(--cp-border); background: var(--cp-bg-elevated); }
.study-toolbar button, .study-toolbar select { height: 44px; min-height: 44px; min-width: 44px; font-size: .85rem; white-space: nowrap; }
.study-toolbar select { width: 120px; }
.quiet-link { padding: 8px; font-size: .8rem; text-decoration: none; }
.status-bar { flex: none; padding: 2px 20px; background: var(--cp-bg-elevated); font-size: .75rem; }
#appStatus { min-height: 1.4em; margin: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--cp-text-muted); }
.status-bar .error:not(:empty) { margin: 6px 0; }
.recovery { margin-bottom: 4px; }
.recovery:has([hidden]):not(:has(button:not([hidden]))) { margin: 0; }
.workspace { flex: 1; display: flex; min-height: 0; }
.builder select { width: 100%; }
.dialog-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.dialog-heading h2 { margin: 0; }
.dialog-heading button { flex: none; min-width: 44px; }
.tool-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.prompt-preview { padding: 12px; font-size: .85rem; border: 1px dashed var(--cp-border-strong); border-radius: .625rem; background: var(--cp-surface); }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.stat { text-align: center; padding: 8px; border: 1px solid var(--cp-border); border-radius: .625rem; background: var(--cp-surface); }
.stat b { display: block; font-size: 1.4rem; color: var(--cp-accent); }
.stat span { font-size: .75rem; color: var(--cp-text-muted); }
.chat { flex: 1; display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.study-content { flex: 1 1 0; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 24px; scrollbar-gutter: stable; }
.welcome { max-width: 860px; margin: 12px auto 24px; padding: 24px; border: 1px solid var(--cp-border); border-radius: 18px; background: linear-gradient(120deg, var(--cp-bg-elevated), var(--cp-surface)); }
.welcome .eyebrow { font-size: .7rem; letter-spacing: .12em; color: var(--cp-brand-teal); margin: 0; }
.welcome h2 { font-size: clamp(1.3rem, 2.3vw, 1.8rem); margin: 10px 0; }
.welcome > p:not(.eyebrow) { max-width: 600px; color: var(--cp-text-soft); }
.prompt-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.prompt-chips button { font-size: .85rem; border-color: var(--cp-border-strong); }
.mini-stats { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: .8rem; color: var(--cp-text-muted); margin-bottom: 8px; }
.mini-stats b { color: var(--cp-accent); }
.msg, .mock-panel { max-width: 860px; margin: 0 auto 20px; overflow-wrap: anywhere; }
.msg { padding: 12px 16px; border: 1px solid var(--cp-border); border-radius: 16px; background: var(--cp-surface); }
.msg.user { margin-left: max(12%, calc((100% - 860px) / 2)); background: var(--cp-accent-soft); }
.msg-label { font-weight: 600; font-size: .8rem; color: var(--cp-text-muted); margin-bottom: 8px; }
.user-content { white-space: pre-wrap; }
.pending { border-style: dashed; }
.stream-preview { min-height: 1.5em; }
.stream-preview:not(:empty)::after { content: " ▍"; color: var(--cp-accent); }
.markdown h1 { font-size: 1.4rem; }
.markdown h2 { font-size: 1.2rem; }
.markdown h3, .markdown h4 { font-size: 1rem; }
.markdown code, .markdown pre { font-family: Consolas, "Courier New", Courier, monospace; background: var(--cp-surface-soft); }
.markdown code { padding: 1px 4px; border-radius: 4px; }
.markdown pre { padding: 12px; border: 1px solid var(--cp-border); border-radius: .625rem; overflow-x: auto; }
.markdown pre code { padding: 0; }
.markdown blockquote { margin: 12px 0; border-left: 3px solid var(--cp-accent); padding: 4px 12px; background: var(--cp-accent-soft); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: .85rem; }
th, td { border: 1px solid var(--cp-border); padding: 8px; text-align: left; }
th { background: var(--cp-surface-soft); }
.composer { flex: none; padding: 8px 20px; border-top: 1px solid var(--cp-border); background: var(--cp-bg-elevated); }
.composer > *, .composer form { max-width: 860px; margin-left: auto; margin-right: auto; }
.composer label { margin-top: 0; }
.compose-row { display: flex; align-items: flex-end; gap: 8px; }
.compose-row textarea { flex: 1; width: 100%; resize: none; height: 44px; max-height: 96px; min-height: 44px; line-height: 22px; padding: 10px 12px; overflow-y: auto; }
.compose-row button { min-height: 44px; flex: none; }
.icon-button { display: grid; place-items: center; width: 44px; padding: 8px; }
.icon-button svg { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.compose-foot { display: flex; align-items: center; gap: 8px; min-height: 28px; font-size: 12px; color: var(--cp-text-muted); }
.compose-foot > :first-child { margin-right: auto; }
.inline-button { min-height: 44px; border: 0; background: transparent; padding: 2px 4px; font-size: 12px; color: var(--cp-link); }
.voice-notification { margin: 0 auto; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.voice-notification:empty { display: none; }
.voice-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.voice-controls label { font-size: .8rem; margin: 0; }
.voice-controls select { padding: 8px; }
.voice-controls button { font-size: .85rem; }
[aria-pressed="true"] { border-color: var(--cp-accent); background: var(--cp-accent-soft); }
#micBtn[aria-pressed="true"] { border-color: var(--cp-brand-teal); color: var(--cp-brand-teal); }
#voiceStatus:empty, #readStatus:empty { margin: 0; }
dialog { width: min(520px, calc(100% - 24px)); max-height: calc(100dvh - 32px); overflow-y: auto; border: 1px solid var(--cp-border); border-radius: 16px; padding: 24px; background: var(--cp-surface); color: var(--cp-text); box-shadow: var(--cp-shadow); }
dialog::backdrop { background: var(--cp-overlay); }
dialog input, dialog select { width: 100%; }
dialog textarea { width: 100%; resize: none; font-family: Consolas, monospace; }
dialog h2 { font-size: 1.4rem; margin-top: 0; }
dialog .primary { margin-top: 8px; }
#startBtn { width: 100%; }
.text-button { border: 0; color: var(--cp-link); text-decoration: underline; margin-top: 8px; }
.mock-panel { padding: 20px; border: 1px solid var(--cp-border); border-radius: 16px; background: var(--cp-surface); }
.mock-meta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.timer { font-family: Consolas, "Courier New", Courier, monospace; font-size: 1.25rem; font-weight: 700; }
.mock-question { border: 0; padding: 0; margin: 16px 0; min-width: 0; }
.mock-question legend { font-size: 1.1rem; font-weight: 600; padding: 0; }
.mock-option { display: flex; align-items: flex-start; gap: 12px; padding: 12px; margin: 8px 0; border: 1px solid var(--cp-border-strong); border-radius: .625rem; font-weight: 400; cursor: pointer; }
.mock-option:has(input:checked) { background: var(--cp-accent-soft); border-color: var(--cp-accent); }
.mock-option input { width: 20px; height: 20px; margin-top: 3px; flex: none; accent-color: var(--cp-accent); }
.feedback { border-left: 4px solid var(--cp-accent); padding: 8px 16px; margin: 16px 0; background: var(--cp-surface-soft); }
.feedback.correct { border-color: var(--cp-success); }
.feedback.incorrect { border-color: var(--cp-danger); }
.report-score { font-size: 1.8rem; font-weight: 700; color: var(--cp-accent); }
.warning { border-left: 4px solid var(--cp-warning); padding: 8px 12px; }
.noscript { position: fixed; inset: 0; padding: 32px; background: var(--cp-surface); }
.landing { max-width: 1100px; margin: auto; padding: 32px 24px; }
.landing header { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.landing .hero { max-width: 760px; padding: 64px 0 40px; }
.landing h1 { font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -.025em; }
.landing .hero h1 { color: var(--cp-text); }
.landing .hero .eyebrow { color: var(--cp-brand-teal); }
.landing .eyebrow { color: var(--cp-accent); font-weight: 600; }
.landing .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.landing article { padding: 24px; background: var(--cp-surface); border: 1px solid var(--cp-border); border-radius: 16px; }
.landing .privacy { margin: 32px 0; padding: 24px; border: 1px solid var(--cp-border); border-radius: 16px; }
.button-link { display: inline-flex; text-decoration: none; align-items: center; }
.reports { max-width: 1120px; margin: 0 auto; padding: 24px; }
.reports-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 24px; }
.reports-header nav { display: flex; align-items: center; gap: 12px; }
.report-section { border: 1px solid var(--cp-border); border-radius: 16px; background: var(--cp-bg-elevated); padding: 20px; margin: 20px 0; min-width: 0; }
.report-section h2 { margin-top: 0; }
.report-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.date-controls { display: flex; flex-wrap: wrap; align-items: end; gap: 12px; }
.date-controls label { margin-top: 0; }
.date-controls > div { flex: 1 1 180px; }
.date-controls input { width: 100%; }
.date-controls select { width: 100%; min-height: 44px; }
.report-exports { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.report-section summary { min-height: 44px; padding: 10px 0; cursor: pointer; color: var(--cp-link); }
.report-section td .small { display: block; font-size: .75rem; }
.report-section .account-drilldown { text-align: left; overflow-wrap: anywhere; max-width: 180px; }
.metrics-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 20px 0; }
.metric { padding: 16px; border: 1px solid var(--cp-border); border-radius: 12px; background: var(--cp-surface); min-width: 0; }
.metric dt { color: var(--cp-text-muted); font-size: .8rem; }
.metric dd { margin: 6px 0 0; font-size: 1.5rem; font-weight: 700; color: var(--cp-accent); overflow-wrap: anywhere; }
.metrics-grid.compact .metric dd { font-size: 1.1rem; }
.report-note { border-left: 3px solid var(--cp-brand-teal); padding-left: 12px; color: var(--cp-text-soft); }
.report-section caption { text-align: left; color: var(--cp-text-muted); padding: 8px 0; }
.report-section th { white-space: nowrap; }
.report-section td { overflow-wrap: anywhere; }
.report-section .table-wrap { max-width: 100%; }
.account-form { max-width: 440px; }
.account-form input { width: 100%; }
@media (max-width: 800px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .mobile-nav { display: block; flex: none; }
  .sidebar { display: none; position: fixed; inset: 64px auto 0 0; z-index: 20; width: min(300px, calc(100vw - 48px)); box-shadow: var(--cp-shadow); }
  .sidebar.open { display: flex; }
  .landing .cards { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .topbar { padding: 8px 12px; gap: 8px; }
  .study-toolbar { padding: 4px 12px; }
  .study-toolbar select { width: 110px; }
  .study-toolbar button { padding: 8px; }
  .composer { padding: 8px 12px max(8px, env(safe-area-inset-bottom)); }
  .study-content { padding: 16px 12px; }
  .status-bar { padding: 2px 12px; }
  .mock-panel { padding: 12px; }
  .usage-link { display: none; }
  .welcome { padding: 18px; margin-top: 0; }
  .prompt-chips { gap: 6px; }
  .prompt-chips button { font-size: .8rem; }
  #messageCount { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .msg.user { margin-left: 16px; }
  dialog { padding: 20px; }
  .landing .hero { padding-top: 40px; }
  .reports { padding: 16px 12px; }
  .report-section { padding: 16px; }
  .metrics-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .metric { padding: 12px; }
  .metric dd { font-size: 1.2rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}