:root {
  --bg: #f3efe4;
  --panel: #fffdf8;
  --ink: #1b252f;
  --line: #d7cdbd;
  --accent: #005f73;
  --accent-2: #ca6702;
  --good: #1f7a3e;
  --bad: #9f1239;
  --muted: #5f6f7f;
  --app-gutter: clamp(12px, 2vw, 30px);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 0% 10%, #fef5cf 0%, transparent 40%),
    radial-gradient(circle at 100% 100%, #d6f0ff 0%, transparent 40%),
    var(--bg);
}

.brand-shell {
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.brand-inner {
  width: 100%;
  max-width: none;
  margin: 0 auto;
  padding: 10px var(--app-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 0.98rem;
}

.brand-copy span {
  font-size: 0.84rem;
  color: var(--muted);
}

.brand-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.auth-user {
  font-size: 0.8rem;
  color: var(--muted);
}

.quota-pill {
  display: inline-flex;
  align-items: center;
  border: 1px solid #b5d4df;
  background: #edf9fd;
  color: #0b5567;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 0.76rem;
  font-weight: 700;
}

.ghost-btn {
  border-radius: 999px;
  padding: 6px 11px;
  background: #fff;
}

.donate-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.donate-btn:hover {
  background: #004f60;
  border-color: #004f60;
}

.layout {
  width: 100%;
  max-width: none;
  margin: 0 auto;
  padding: 22px var(--app-gutter);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}

.hidden {
  display: none !important;
}

h1,
h2,
h3 {
  margin: 0 0 10px;
}

.seo-intro p {
  margin: 0 0 8px;
  line-height: 1.45;
}

.seo-intro p:last-child {
  margin-bottom: 0;
}

.sub {
  margin: 0 0 14px;
  color: var(--muted);
}

.header-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.mode-controls {
  display: flex;
  gap: 8px;
}

.topbar {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.mode-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.timer {
  margin-left: auto;
  font-weight: 700;
  color: var(--accent-2);
}

.quota-status {
  margin: 8px 0 0;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--accent);
}

select,
button {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
}

button {
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

.stats {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.meta {
  color: var(--muted);
}

.question-nav {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(52px, 1fr));
  gap: 8px;
}

.qnav-btn {
  width: 100%;
  min-height: 40px;
  font-weight: 700;
}

.qnav-btn.current {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.qnav-btn.answered {
  background: #eef9fd;
  border-color: #bad8e0;
}

.qnav-btn.correct {
  background: #e8f8eb;
  border-color: #a7d9b2;
}

.qnav-btn.wrong {
  background: #feecef;
  border-color: #f3b2c2;
}

.two-col {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 18px;
}

body.structured-active .two-col {
  grid-template-columns: 1fr;
}

body.structured-active .two-col > article {
  display: none;
}

.structured-review-split {
  display: block;
}

body.structured-active .structured-review-split {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 12px;
}

body.structured-active .structured-review-split.review-hidden {
  grid-template-columns: 1fr;
}

.paper-pane {
  min-width: 0;
}

.rubric-pane {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 10px;
  max-height: clamp(520px, 72vh, 980px);
  overflow: auto;
}

.rubric-pane h4 {
  margin: 0 0 8px;
}

.rubric-text {
  white-space: pre-wrap;
  line-height: 1.4;
  font-size: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  background: #faf9f7;
  min-height: 90px;
}

.ms-frame-wrap {
  width: 100%;
  height: clamp(300px, 42vh, 620px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  overflow: auto;
}

#markSchemeCanvas {
  display: block;
  margin: 0 auto;
  background: #fff;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.zoom-controls button {
  min-width: 34px;
  padding: 6px 9px;
}

.zoom-value {
  min-width: 52px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

.stem {
  white-space: pre-wrap;
  line-height: 1.4;
}

.option-list {
  display: grid;
  gap: 8px;
}

.field-label {
  display: block;
  margin: 8px 0 6px;
  font-size: 0.86rem;
  color: var(--muted);
}

.structured-answer-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  font: inherit;
  background: #fff;
  resize: vertical;
}

.option {
  text-align: left;
  min-height: 44px;
  white-space: pre-wrap;
}

.option .letter {
  display: inline-block;
  width: 24px;
  font-weight: 700;
  color: var(--accent);
}

.option.selected {
  border-color: var(--accent);
  background: #eef9fd;
}

.option.correct {
  border-color: var(--good);
  background: #e8f8eb;
}

.option.wrong {
  border-color: var(--bad);
  background: #feecef;
}

.warning {
  color: #9f1239;
  font-weight: 600;
}

.feedback {
  margin-top: 10px;
  min-height: 22px;
  font-weight: 600;
}

.feedback.good {
  color: var(--good);
}

.feedback.bad {
  color: var(--bad);
}

.actions {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.structured-note {
  margin: 2px 0 8px;
  font-size: 0.88rem;
  color: var(--muted);
}

.structured-main-row {
  margin-top: 8px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px;
}

.structured-row-group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.structured-main-row .structured-row-group:first-child {
  justify-content: flex-start;
}

.structured-main-row .structured-row-group:nth-child(2) {
  justify-content: center;
}

.structured-main-row .structured-row-group:last-child {
  justify-content: flex-end;
}

.structured-nav-row {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.structured-nav-row .zoom-controls {
  margin-left: auto;
}

.timer-inline {
  display: inline-flex;
  align-items: center;
  font-weight: 700;
  color: var(--accent-2);
  padding: 0 4px;
}

.links {
  margin-top: 12px;
}

.links a {
  margin-right: 10px;
}

.summary {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fff;
}

.summary h4 {
  margin: 0 0 8px;
}

.wrong-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.wrong-list button {
  min-width: 44px;
}

.pdf-frame-wrap {
  width: 100%;
  height: clamp(520px, 72vh, 980px);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  overflow: auto;
  position: relative;
}

#pdfCanvasLayer {
  position: relative;
  margin: 0 auto;
  width: 1px;
  height: 1px;
}

#pdfCanvas {
  display: block;
  background: #fff;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

#inkCanvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  pointer-events: none;
  touch-action: none;
}

.pdf-frame-wrap.ink-enabled #inkCanvas {
  pointer-events: auto;
  cursor: crosshair;
}

.pdf-status {
  margin: 8px 0 0;
  font-size: 0.83rem;
  color: var(--muted);
}

.auth-modal {
  position: fixed;
  inset: 0;
  background: rgba(14, 24, 32, 0.4);
  display: grid;
  place-items: center;
  z-index: 20;
  padding: 18px;
}

.auth-card {
  width: min(440px, 95vw);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.auth-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.auth-card h3 {
  margin: 0;
}

.auth-card input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
}

.auth-actions {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.app-footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
  color: var(--muted);
}

.footer-inner {
  width: 100%;
  max-width: none;
  margin: 0 auto;
  padding: 14px var(--app-gutter) 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-logo {
  height: 96px;
  width: auto;
  flex: 0 0 auto;
}

.footer-link {
  display: inline-flex;
  align-items: center;
}

.footer-text {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.45;
}

.footer-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.footer-contact {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.45;
  text-align: center;
  font-weight: 600;
}

.footer-text a {
  color: var(--accent);
}

.footer-contact a {
  color: var(--accent);
}

@media (max-width: 960px) {
  .brand-inner {
    align-items: flex-start;
  }

  .brand-actions {
    justify-content: flex-start;
  }

  .donate-btn {
    font-size: 0.8rem;
    padding: 6px 12px;
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .pdf-frame-wrap {
    height: 460px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-logo {
    height: 72px;
  }

  .preview-head {
    align-items: flex-start;
  }

  .structured-review-split {
    grid-template-columns: 1fr;
  }

  .rubric-pane {
    max-height: none;
  }
}