@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Slab:wght@400;600;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --ink: #1C2321;
  --paper: #F5F1E6;
  --paper-text: #2B2E2A;
  --red: #C1462F;
  --green: #3C8B6D;
  --gold: #C9A227;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--ink);
  font-family: 'Inter', sans-serif;
  color: var(--paper);
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; }
.display { font-family: 'IBM Plex Slab', serif; }
.mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }

@keyframes stampIn { from { transform: scale(.5) rotate(-6deg); opacity: 0; } to { transform: scale(1) rotate(-6deg); opacity: 1; } }
.stamp { animation: stampIn .35s ease-out; }
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

.container { max-width: 640px; margin: 0 auto; padding: 40px 16px 60px; }

.eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--gold); margin: 0; }
.h1 { font-family: 'IBM Plex Slab', serif; font-size: 32px; color: var(--paper); margin: 4px 0 0; }

.stack { display: flex; flex-direction: column; gap: 12px; margin-top: 32px; }

.btn-add { border: 2px dashed rgba(245,241,230,.25); border-radius: 10px; padding: 20px; display: flex; align-items: center; justify-content: center; gap: 8px; color: rgba(245,241,230,.7); background: transparent; cursor: pointer; font-size: 14px; transition: color .15s, border-color .15s; }
.btn-add:hover { border-color: var(--gold); color: var(--gold); }

.empty-note { text-align: center; font-size: 14px; color: rgba(245,241,230,.4); margin-top: 8px; }

.card { background: var(--paper); color: var(--paper-text); border-radius: 10px; padding: 20px; cursor: pointer; position: relative; transition: box-shadow .15s; border: none; text-align: left; width: 100%; }
.card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.25); }
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding-right: 24px; }
.card-title { font-family: 'IBM Plex Slab', serif; font-size: 18px; line-height: 1.3; margin: 0; }
.card-meta { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: rgba(43,46,42,.5); margin: 4px 0 0; }

.delete-btn { position: absolute; top: 14px; right: 14px; opacity: 0; transition: opacity .15s, color .15s; background: none; border: none; color: rgba(43,46,42,.3); cursor: pointer; padding: 2px; }
.card:hover .delete-btn { opacity: 1; }
.delete-btn:hover { color: var(--red); }

.score-stamp { flex-shrink: 0; width: 56px; height: 56px; border-radius: 50%; border: 2px solid var(--red); display: flex; align-items: center; justify-content: center; transform: rotate(-6deg); font-family: 'IBM Plex Mono', monospace; font-size: 14px; color: var(--red); }

.progress-track { height: 6px; background: rgba(43,46,42,.1); border-radius: 999px; overflow: hidden; margin-top: 14px; }
.progress-fill { height: 100%; background: var(--gold); }
.progress-label { font-family: 'IBM Plex Mono', monospace; font-size: 10px; color: rgba(43,46,42,.4); margin: 4px 0 0; }

.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: none; align-items: center; justify-content: center; padding: 16px; z-index: 50; }
.overlay.show { display: flex; }
.modal { background: var(--paper); color: var(--paper-text); border-radius: 10px; padding: 24px; width: 100%; max-width: 520px; max-height: 85vh; overflow-y: auto; }
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-title { font-family: 'IBM Plex Slab', serif; font-size: 20px; margin: 0; }
.modal-close { background: none; border: none; cursor: pointer; color: inherit; padding: 4px; }

.form-label { display: block; font-family: 'IBM Plex Mono', monospace; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: rgba(43,46,42,.5); margin: 0 0 4px; }
.form-input, .form-textarea { width: 100%; border: 1px solid rgba(43,46,42,.2); border-radius: 6px; padding: 8px 12px; background: #fff; font-family: inherit; font-size: 14px; margin-bottom: 16px; color: var(--paper-text); }
.form-input:focus, .form-textarea:focus { outline: none; border-color: var(--gold); }
.form-textarea { font-family: 'IBM Plex Mono', monospace; font-size: 12px; min-height: 160px; margin-bottom: 8px; resize: vertical; }

.upload-label { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: rgba(43,46,42,.6); cursor: pointer; margin-bottom: 8px; }

.error-text { color: var(--red); font-size: 14px; margin: 4px 0 0; }

.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.btn-secondary { background: none; border: none; color: rgba(43,46,42,.6); padding: 8px 16px; font-size: 14px; cursor: pointer; }
.btn-primary { background: var(--paper-text); color: var(--paper); border: none; border-radius: 6px; padding: 8px 16px; font-size: 14px; cursor: pointer; }
.btn-primary:disabled { opacity: .4; cursor: default; }

.quiz-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; gap: 12px; }
.exit-link { display: flex; align-items: center; gap: 4px; background: none; border: none; color: rgba(245,241,230,.6); cursor: pointer; font-size: 14px; padding: 4px 0; }
.exit-link:hover { color: var(--paper); }
.quiz-title { font-family: 'IBM Plex Slab', serif; font-size: 18px; color: var(--paper); max-width: 55%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin: 0; }

.palette { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; }
.palette-btn { flex-shrink: 0; width: 32px; height: 32px; border-radius: 6px; font-family: 'IBM Plex Mono', monospace; font-size: 12px; display: flex; align-items: center; justify-content: center; border: 1px solid rgba(245,241,230,.25); background: transparent; color: rgba(245,241,230,.6); cursor: pointer; transition: background .15s, border-color .15s, color .15s; }
.palette-btn.current { box-shadow: 0 0 0 2px var(--gold); }
.palette-btn.correct { background: var(--green); border-color: var(--green); color: #fff; }
.palette-btn.wrong { background: var(--red); border-color: var(--red); color: #fff; }
.palette-btn.selected { background: rgba(201,162,39,.25); border-color: var(--gold); color: var(--paper); }

.qcard { background: var(--paper); color: var(--paper-text); border-radius: 10px; padding: 24px; margin-top: 16px; }
.qcard-head { display: flex; justify-content: space-between; align-items: center; }
.qcard-count { font-family: 'IBM Plex Mono', monospace; font-size: 12px; text-transform: uppercase; color: rgba(43,46,42,.5); margin: 0; }
.qcard-marks { font-family: 'IBM Plex Mono', monospace; font-size: 12px; border: 1px solid var(--red); color: var(--red); border-radius: 999px; padding: 2px 10px; }
.qcard-question { font-family: 'IBM Plex Slab', serif; font-size: 20px; line-height: 1.35; margin: 14px 0 0; }
.qcard-hint { font-size: 12px; color: rgba(43,46,42,.4); margin: 4px 0 0; }

.options { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.option { display: flex; align-items: center; gap: 12px; text-align: left; width: 100%; border: 1px solid rgba(43,46,42,.15); border-radius: 8px; padding: 12px; background: none; cursor: pointer; font-size: 14px; color: inherit; transition: border-color .15s, background .15s, opacity .15s; }
.option:hover:not(.disabled) { border-color: rgba(43,46,42,.4); }
.option.selected { border-color: var(--paper-text); background: rgba(43,46,42,.05); }
.option.correct { border-color: var(--green); background: rgba(60,139,109,.1); }
.option.wrong { border-color: var(--red); background: rgba(193,70,47,.1); }
.option.muted { opacity: .6; }
.option.disabled { cursor: default; }

.option-indicator { flex-shrink: 0; width: 20px; height: 20px; border-radius: 50%; border: 1px solid rgba(43,46,42,.3); display: flex; align-items: center; justify-content: center; color: inherit; }
.option-indicator.square { border-radius: 4px; }
.option-dot { width: 10px; height: 10px; background: var(--paper-text); border-radius: 50%; }
.option-dot.square { border-radius: 2px; }

.submit-btn { margin-top: 16px; background: var(--paper-text); color: var(--paper); border: none; border-radius: 6px; padding: 10px 18px; font-size: 14px; cursor: pointer; }
.submit-btn:disabled { opacity: .3; cursor: default; }

.feedback { margin-top: 16px; border-radius: 8px; padding: 12px; display: flex; gap: 8px; align-items: flex-start; }
.feedback.correct { background: rgba(60,139,109,.1); }
.feedback.wrong { background: rgba(193,70,47,.1); }
.feedback-title { font-weight: 600; font-size: 14px; margin: 0; }
.feedback.correct .feedback-title { color: #2f6650; }
.feedback.wrong .feedback-title { color: #8a2f1f; }
.feedback-sub { font-size: 14px; margin: 4px 0 0; color: rgba(138,47,31,.85); }

.explanation { margin-top: 12px; border-left: 4px solid var(--gold); background: rgba(201,162,39,.1); padding: 12px; border-radius: 0 6px 6px 0; }
.explanation-label { font-family: 'IBM Plex Mono', monospace; font-size: 10px; text-transform: uppercase; letter-spacing: .05em; color: #8a6d15; display: block; margin-bottom: 4px; }
.explanation-text { font-style: italic; color: rgba(43,46,42,.8); margin: 0; font-size: 14px; }

.nav-row { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; gap: 8px; }
.nav-btn { display: flex; align-items: center; gap: 4px; background: none; border: none; color: rgba(245,241,230,.8); padding: 8px 12px; font-size: 14px; cursor: pointer; }
.nav-btn:disabled { opacity: .3; cursor: default; }
.nav-status { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: rgba(245,241,230,.4); text-align: center; }
.finish-btn { background: var(--gold); color: var(--ink); border: none; border-radius: 6px; padding: 10px 18px; font-weight: 600; font-size: 14px; cursor: pointer; }

.results-header { display: flex; flex-direction: column; align-items: center; padding: 16px 0 32px; }
.results-stamp { width: 128px; height: 128px; border-radius: 50%; border: 4px solid var(--red); display: flex; align-items: center; justify-content: center; transform: rotate(-6deg); font-family: 'IBM Plex Slab', serif; font-size: 30px; color: var(--red); }
.results-marks { margin: 12px 0 0; font-family: 'IBM Plex Mono', monospace; font-size: 14px; color: rgba(245,241,230,.8); }
.results-unanswered { font-size: 12px; color: rgba(245,241,230,.4); margin: 4px 0 0; }

.breakdown-row { width: 100%; display: flex; justify-content: space-between; align-items: center; background: var(--paper); color: var(--paper-text); border-radius: 6px; padding: 12px 16px; margin-bottom: 8px; border: none; cursor: pointer; text-align: left; font-family: inherit; gap: 12px; }
.breakdown-q { display: flex; align-items: center; gap: 12px; min-width: 0; }
.breakdown-idx { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: rgba(43,46,42,.4); width: 20px; flex-shrink: 0; }
.breakdown-text { font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.breakdown-skip { font-size: 12px; color: rgba(43,46,42,.4); flex-shrink: 0; }

.results-actions { display: flex; gap: 12px; margin-top: 24px; }
.btn-retake { flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px; background: var(--gold); color: var(--ink); border: none; border-radius: 6px; padding: 10px; font-weight: 600; font-size: 14px; cursor: pointer; }
.btn-exit { flex: 1; background: none; border: 1px solid rgba(245,241,230,.3); color: rgba(245,241,230,.8); border-radius: 6px; padding: 10px; font-size: 14px; cursor: pointer; }

.loading { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.loading p { font-family: 'IBM Plex Mono', monospace; color: rgba(245,241,230,.5); font-size: 14px; }