:root {
  --ink: #202a3b;
  --muted: #6f7786;
  --line: #d8dce5;
  --paper: #f3f5f8;
  --panel: #ffffff;
  --teal: #080d55;
  --teal-dark: #000083;
  --coral: #cc9901;
  --gold: #a57c01;
  --shadow: 0 14px 35px rgba(8, 13, 85, .09);
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: radial-gradient(circle at top left, #fff 0, var(--paper) 45%, #e7eaf1 100%); font-family: Georgia, 'Times New Roman', serif; }
button, select, input { font: inherit; } button { cursor: pointer; }
.app-shell { width: min(980px, calc(100% - 32px)); margin: 0 auto; padding: 42px 0 64px; }
.topbar { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 32px; }.header-actions { display: flex; gap: 8px; }
.eyebrow { margin: 0 0 8px; color: var(--teal); font: 700 11px/1.2 Arial, sans-serif; letter-spacing: .12em; } h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(36px, 6vw, 62px); line-height: .98; font-weight: 500; } h2 { margin-bottom: 0; font-size: 30px; font-weight: 500; }
.theme-button, .menu-button, .secondary-button { padding: 10px 13px; color: var(--teal-dark); background: transparent; border: 1px solid var(--line); border-radius: 6px; font: 700 11px Arial, sans-serif; }.theme-button:hover, .menu-button:hover, .secondary-button:hover { background: rgba(8, 13, 85, .08); }
.setup-panel, .quiz-panel, .results-panel { background: rgba(255, 255, 255, .84); border: 1px solid var(--line); box-shadow: var(--shadow); border-radius: 10px; }.setup-panel { padding: 30px; border-top: 4px solid var(--teal); }
.section-heading { display: flex; justify-content: space-between; gap: 24px; align-items: end; }.muted { color: var(--muted); font: 14px/1.5 Arial, sans-serif; max-width: 320px; margin-bottom: 2px; }.mode-hint, .loading-message { margin: 14px 0 0; color: var(--muted); font: 12px/1.45 Arial, sans-serif; }.loading-message.error-message { color: #9a3328; }
.controls { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; align-items: end; margin-top: 28px; }.practice-sets { display: grid; grid-template-columns: 1fr 1fr; grid-column: span 3; gap: 9px 14px; min-width: 0; margin: 0; padding: 14px; border: 1px solid var(--line); border-radius: 7px; }.practice-sets legend { padding: 0 5px; color: var(--muted); font: 700 11px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }.practice-sets label { display: flex; align-items: center; gap: 8px; font: 12px Arial, sans-serif; letter-spacing: 0; text-transform: none; }.practice-sets input { accent-color: var(--teal); }
label { display: grid; gap: 8px; color: var(--muted); font: 700 11px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; } select { width: 100%; padding: 13px 14px; color: var(--ink); background: #fbfcfb; border: 1px solid var(--line); border-radius: 6px; }
.primary-button, .next-button, .submit-button { border: 0; padding: 14px 20px; color: white; background: var(--teal); font: 700 13px Arial, sans-serif; border-radius: 6px; }.primary-button:hover, .next-button:hover { background: var(--teal-dark); }.primary-button:disabled { cursor: wait; opacity: .55; }.controls .primary-button { grid-column: 1 / -1; justify-self: start; }
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 16px 0 30px; }.stat { padding: 17px 20px; border-bottom: 2px solid var(--line); background: rgba(231, 234, 241, .8); border-radius: 8px; }.stat span { display: block; font-size: 27px; }.stat small { color: var(--muted); font: 11px Arial, sans-serif; text-transform: uppercase; letter-spacing: .08em; }
.hidden { display: none !important; }.quiz-panel, .results-panel { padding: 26px 30px 30px; }.quiz-meta { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font: 12px Arial, sans-serif; }.quiz-meta .menu-button { margin-left: auto; padding: 5px 9px; }.progress-track { height: 4px; margin: 14px 0 36px; background: var(--line); }.progress-track div { height: 100%; width: 0; background: var(--coral); transition: width .25s ease; }
.question-kicker { color: var(--teal); font: 700 11px Arial, sans-serif; letter-spacing: .1em; text-transform: uppercase; }.question-title { max-width: 760px; margin: 10px 0 24px; font-size: clamp(25px, 4vw, 38px); line-height: 1.1; font-weight: 500; }.study-answer { max-width: 760px; margin: 20px 0; padding: 22px; background: #eef0f7; border-left: 4px solid var(--teal); border-radius: 7px; }.study-answer span { color: var(--muted); font: 700 10px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }.study-answer p { margin: 10px 0 0; font-size: 20px; line-height: 1.55; }.study-prompt { color: var(--muted); font: 13px Arial, sans-serif; }
.study-image, .question-image { display: block; width: min(220px, 100%); max-height: 180px; object-fit: contain; margin: 16px 0; padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }.asset-details p { font-size: 16px; }
.answer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }.answer { min-height: 62px; padding: 15px 17px; text-align: left; color: var(--ink); background: rgba(255, 255, 255, .82); border: 1px solid var(--line); border-left: 4px solid #9da9c6; border-radius: 6px; }.answer:hover { border-color: var(--teal); background: #f2f3fa; }.answer.correct { border-color: #3d947a; background: #e7f4ed; }.answer.incorrect { border-color: var(--coral); background: #fff0ec; }.fill-row { display: flex; gap: 10px; max-width: 760px; }.fill-input { flex: 1; min-width: 0; padding: 15px 17px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 6px; font: 16px Georgia, serif; }.fill-input:focus, select:focus { outline: 3px solid rgba(8, 13, 85, .15); border-color: var(--teal); }
.study-navigation { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 18px; }.study-navigation .next-button { margin: 0 0 0 auto; }
.feedback { margin-top: 22px; padding: 15px 17px; font: 14px/1.45 Arial, sans-serif; border-left: 4px solid var(--gold); background: #fffaf0; border-radius: 5px; }.feedback strong { display: block; margin-bottom: 3px; }.next-button { display: block; margin: 18px 0 0 auto; }.results-panel { text-align: center; border-top: 4px solid var(--coral); }.results-score { margin: 14px 0 5px; color: var(--teal); font-size: 64px; }.results-panel p { color: var(--muted); font: 14px Arial, sans-serif; }.results-panel .primary-button { margin-top: 16px; }.results-panel .secondary-button { display: block; margin: 12px auto 0; }
.command-progress { margin-top: 30px; padding: 26px 30px; background: rgba(255, 255, 255, .56); border: 1px solid var(--line); border-radius: 10px; }.mastery-summary { display: grid; grid-template-columns: repeat(3, minmax(0, 150px)); gap: 10px; margin-top: 22px; }.mastery-stat { padding: 13px 15px; background: rgba(231, 234, 241, .8); border-radius: 7px; }.mastery-stat strong { display: block; color: var(--teal); font-size: 25px; }.mastery-stat span { color: var(--muted); font: 10px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }.mastery-toolbar { display: flex; align-items: center; gap: 10px; margin-top: 22px; color: var(--muted); font: 11px Arial, sans-serif; }.mastery-toolbar label { display: block; font: 700 11px Arial, sans-serif; }.mastery-toolbar select { width: auto; min-width: 170px; padding: 9px 11px; }.mastery-list { display: grid; grid-template-columns: 1fr 1fr; gap: 9px 18px; margin-top: 20px; }.mastery-item { display: grid; grid-template-columns: minmax(0, 1fr) 100px; gap: 12px; align-items: center; padding: 11px 0; border-bottom: 1px solid var(--line); }.mastery-item strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }.mastery-item small { color: var(--muted); font: 10px Arial, sans-serif; }.mastery-bar { height: 6px; overflow: hidden; background: var(--line); border-radius: 10px; }.mastery-bar span { display: block; height: 100%; background: var(--coral); border-radius: inherit; }.privacy-note { margin: 18px 0 0; color: var(--muted); text-align: center; font: 11px Arial, sans-serif; }.comparison { display: grid; gap: 5px; margin-top: 10px; }.comparison span { color: var(--muted); font: 10px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }.comparison p { margin: 0 0 8px; line-height: 1.5; }.comparison mark { padding: 2px 3px; color: #8d4035; background: #f6c9bf; }.comparison mark.extra { text-decoration: line-through; }.comparison .match { color: #31765f; }.keyboard-hint { margin-top: 18px; color: var(--muted); font: 10px Arial, sans-serif; text-align: right; }
.focus-mode .stats-row, .focus-mode .command-progress, .focus-mode .topbar > div:first-child + .header-actions .theme-button:first-child { display: none; }.focus-mode .app-shell { width: min(780px, calc(100% - 32px)); }.focus-mode .quiz-panel { margin-top: 20px; }
body.dark-mode { --ink: #e9ebf5; --muted: #aeb4c8; --line: #343b68; --paper: #090d2d; --panel: #111743; --teal: #7380e6; --teal-dark: #9ca6ff; --coral: #cc9901; --gold: #d3a817; --shadow: 0 14px 35px rgba(0, 0, 0, .2); background: radial-gradient(circle at top left, #181f5d 0, var(--paper) 55%, #03051c 100%); }.dark-mode .setup-panel, .dark-mode .quiz-panel, .dark-mode .results-panel { background: rgba(17, 23, 67, .92); }.dark-mode .stat, .dark-mode .mastery-stat, .dark-mode .study-answer { background: rgba(22, 29, 79, .9); }.dark-mode select, .dark-mode .answer, .dark-mode .fill-input { color: var(--ink); background: #171d50; }.dark-mode .answer:hover { background: #202866; }.dark-mode .feedback { background: #3a3526; }.dark-mode .theme-button, .dark-mode .menu-button, .dark-mode .secondary-button { color: var(--teal); }.dark-mode .command-progress { background: rgba(17, 23, 67, .82); }
@media (max-width: 680px) { .app-shell { width: min(100% - 22px, 980px); padding-top: 26px; }.topbar { margin-bottom: 24px; }.setup-panel, .quiz-panel, .results-panel, .command-progress { padding: 22px 18px; }.header-actions { display: grid; gap: 5px; }.section-heading, .controls { display: grid; grid-template-columns: 1fr; align-items: stretch; }.controls { margin-top: 22px; }.practice-sets { grid-column: auto; grid-template-columns: 1fr; }.controls .primary-button { grid-column: auto; }.primary-button { width: 100%; }.answer-grid { grid-template-columns: 1fr; }.fill-row { display: grid; grid-template-columns: 1fr; }.submit-button { width: 100%; }.stats-row { margin-bottom: 20px; }.stat { padding: 13px; }.stat span { font-size: 23px; }.mastery-summary { grid-template-columns: repeat(3, 1fr); }.mastery-list { grid-template-columns: 1fr; }.keyboard-hint { text-align: left; } }