/* ============================================================================
   CCA-F Study Guide — design system

   Light is the base palette on bare :root. Dark redefines only the tokens, under
   both `prefers-color-scheme` (system default) and `[data-theme]` (explicit
   choice), so the toggle wins in both directions.
   ========================================================================= */

:root {
  color-scheme: light;

  /* Surfaces, warm neutral — reads as paper rather than screen */
  --bg: #f7f6f3;
  --bg-sunk: #efede8;
  --surface: #ffffff;
  --surface-2: #faf9f7;
  --surface-3: #f2f0ec;
  --border: #e4e1da;
  --border-strong: #d2cec4;

  /* Text */
  --text: #1b1a18;
  --text-2: #55524c;
  --text-3: #8a857c;

  /* Accent — clay */
  --accent: #b4533c;
  --accent-hover: #9a4531;
  --accent-soft: #fbeeea;
  --accent-border: #e8c4b8;
  --on-accent: #ffffff;

  /* Semantic */
  --ok: #2f7a4e;
  --ok-soft: #e6f4ec;
  --ok-border: #b6ddc6;
  --bad: #b5372f;
  --bad-soft: #fceceb;
  --bad-border: #efc1bd;
  --warn: #9a6c10;
  --warn-soft: #fdf3dc;
  --warn-border: #ecd7a1;
  --info: #2c5f8f;
  --info-soft: #e9f1f9;
  --info-border: #bcd4e8;

  /* Domain hues — used for domain identity across every view. Chosen for
     distinguishable lightness as well as hue, so they survive greyscale. */
  --d1: #b4533c;
  --d2: #2c6e78;
  --d3: #5b5391;
  --d4: #9a6c10;
  --d5: #2f7a4e;

  /* Type */
  --font:
    ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Inter,
    system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  /* Shape and depth */
  --r-sm: 6px;
  --r: 10px;
  --r-lg: 16px;
  --r-full: 999px;
  --shadow-1: 0 1px 2px rgb(0 0 0 / 0.04), 0 1px 3px rgb(0 0 0 / 0.05);
  --shadow-2: 0 2px 4px rgb(0 0 0 / 0.04), 0 8px 24px rgb(0 0 0 / 0.07);
  --shadow-3: 0 4px 8px rgb(0 0 0 / 0.06), 0 20px 48px rgb(0 0 0 / 0.12);
  --ring: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);

  /* Layout */
  --sidebar-w: 236px;
  --measure: 68ch;
  --header-h: 56px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #191817;
    --bg-sunk: #131211;
    --surface: #222120;
    --surface-2: #292827;
    --surface-3: #323130;
    --border: #383634;
    --border-strong: #4b4845;
    --text: #ecebe8;
    --text-2: #a8a49d;
    --text-3: #7c7871;
    --accent: #e08466;
    --accent-hover: #ef9a7f;
    --accent-soft: #33221c;
    --accent-border: #5c3a2d;
    --on-accent: #1b1a18;
    --ok: #74c496;
    --ok-soft: #1a2f22;
    --ok-border: #2f5540;
    --bad: #e78d85;
    --bad-soft: #331f1d;
    --bad-border: #5d3631;
    --warn: #d8b164;
    --warn-soft: #322616;
    --warn-border: #574523;
    --info: #85b3dc;
    --info-soft: #1a2733;
    --info-border: #2f4759;
    --d1: #e08466;
    --d2: #6bb3bd;
    --d3: #9b93d4;
    --d4: #d8b164;
    --d5: #74c496;
    --shadow-1: 0 1px 2px rgb(0 0 0 / 0.3);
    --shadow-2: 0 2px 4px rgb(0 0 0 / 0.3), 0 8px 24px rgb(0 0 0 / 0.35);
    --shadow-3: 0 4px 8px rgb(0 0 0 / 0.35), 0 20px 48px rgb(0 0 0 / 0.5);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #191817;
  --bg-sunk: #131211;
  --surface: #222120;
  --surface-2: #292827;
  --surface-3: #323130;
  --border: #383634;
  --border-strong: #4b4845;
  --text: #ecebe8;
  --text-2: #a8a49d;
  --text-3: #7c7871;
  --accent: #e08466;
  --accent-hover: #ef9a7f;
  --accent-soft: #33221c;
  --accent-border: #5c3a2d;
  --on-accent: #1b1a18;
  --ok: #74c496;
  --ok-soft: #1a2f22;
  --ok-border: #2f5540;
  --bad: #e78d85;
  --bad-soft: #331f1d;
  --bad-border: #5d3631;
  --warn: #d8b164;
  --warn-soft: #322616;
  --warn-border: #574523;
  --info: #85b3dc;
  --info-soft: #1a2733;
  --info-border: #2f4759;
  --d1: #e08466;
  --d2: #6bb3bd;
  --d3: #9b93d4;
  --d4: #d8b164;
  --d5: #74c496;
  --shadow-1: 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-2: 0 2px 4px rgb(0 0 0 / 0.3), 0 8px 24px rgb(0 0 0 / 0.35);
  --shadow-3: 0 4px 8px rgb(0 0 0 / 0.35), 0 20px 48px rgb(0 0 0 / 0.5);
}

/* ---------------------------------------------------------------- base ----- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 400 15px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 640;
  letter-spacing: -0.011em;
  line-height: 1.25;
}
h1 {
  font-size: 1.5rem;
  letter-spacing: -0.021em;
}
h2 {
  font-size: 1.125rem;
}
h3 {
  font-size: 0.975rem;
}
p {
  margin: 0 0 0.85em;
}
p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--accent);
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 2px;
}
a:hover {
  color: var(--accent-hover);
  text-decoration-color: currentColor;
}

code,
kbd,
samp {
  font-family: var(--mono);
  font-size: 0.875em;
}

:where(p, li, td) > code {
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 0.08em 0.32em;
  white-space: nowrap;
}

kbd {
  background: var(--surface-3);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: var(--r-sm);
  padding: 0.1em 0.4em;
  font-size: 0.78em;
  color: var(--text-2);
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* -------------------------------------------------------------- app shell -- */

#app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 12px;
  background: var(--bg-sunk);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 14px;
  text-decoration: none;
  color: inherit;
}
.brand:hover {
  color: inherit;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  flex: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.brand-text {
  min-width: 0;
}
.brand-text strong {
  display: block;
  font-size: 0.875rem;
  font-weight: 640;
  letter-spacing: -0.01em;
}
.brand-text span {
  display: block;
  font-size: 0.6875rem;
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-label {
  padding: 14px 8px 5px;
  font-size: 0.6875rem;
  font-weight: 620;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 9px;
  border-radius: var(--r-sm);
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.875rem;
  transition:
    background 0.12s,
    color 0.12s;
}
.nav-item:hover {
  background: var(--surface-3);
  color: var(--text);
}
.nav-item[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 560;
}
.nav-item svg {
  flex: none;
  width: 16px;
  height: 16px;
}
.nav-item .badge {
  margin-left: auto;
}

.sidebar-foot {
  margin-top: auto;
  padding-top: 14px;
  display: grid;
  gap: 4px;
}

.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: var(--header-h);
  padding: 8px 24px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  font-size: 0.8125rem;
  color: var(--text-3);
}
.crumbs a {
  color: var(--text-2);
  text-decoration: none;
}
.crumbs a:hover {
  color: var(--text);
}
.crumbs .sep {
  opacity: 0.5;
}
.crumbs strong {
  color: var(--text);
  font-weight: 560;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.view {
  flex: 1;
  padding: 26px 24px 72px;
  max-width: 1120px;
  width: 100%;
  animation: rise 0.22s ease-out;
}
.view.wide {
  max-width: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
}

.menu-btn {
  display: none;
}

@media (max-width: 900px) {
  #app {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar {
    position: fixed;
    z-index: 60;
    left: 0;
    top: 0;
    width: min(84vw, 300px);
    transform: translateX(-102%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-3);
  }
  body[data-nav="open"] .sidebar {
    transform: none;
  }
  body[data-nav="open"] .scrim {
    opacity: 1;
    pointer-events: auto;
  }
  .menu-btn {
    display: inline-grid;
  }
  .view {
    padding: 20px 16px 64px;
  }
  .topbar {
    padding: 8px 16px;
  }
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgb(0 0 0 / 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

/* ----------------------------------------------------------------- pieces -- */

.page-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.page-head .grow {
  flex: 1;
  min-width: 260px;
}
.page-head p {
  margin: 6px 0 0;
  color: var(--text-2);
  max-width: var(--measure);
}
.eyebrow {
  font-size: 0.6875rem;
  font-weight: 620;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 5px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 16px;
  box-shadow: var(--shadow-1);
}
.card.pad-lg {
  padding: 20px 22px;
}
.card.sunk {
  background: var(--surface-2);
  box-shadow: none;
}

.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition:
    border-color 0.14s,
    box-shadow 0.14s,
    transform 0.14s;
}
.card-link:hover {
  color: inherit;
  border-color: var(--border-strong);
  box-shadow: var(--shadow-2);
  transform: translateY(-1px);
}

.grid {
  display: grid;
  gap: 14px;
}
.grid.cols-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid.cols-3 {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.grid.cols-4 {
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.row.tight {
  gap: 6px;
}
.row.between {
  justify-content: space-between;
}
/* A header row pairing a growing title with a fixed-width badge must not wrap, or
   the badge drops to the next line and reads as left-aligned. */
.row.between.nowrap-row {
  flex-wrap: nowrap;
}
.spacer {
  flex: 1;
}
.stack {
  display: grid;
  gap: 14px;
}
.stack.tight {
  gap: 8px;
}
.stack.loose {
  gap: 24px;
}

hr.rule {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 22px 0;
}

.muted {
  color: var(--text-2);
}
.dim {
  color: var(--text-3);
}
.small {
  font-size: 0.8125rem;
}
.tiny {
  font-size: 0.75rem;
}
.tabular {
  font-variant-numeric: tabular-nums;
}
.mono {
  font-family: var(--mono);
}
.nowrap {
  white-space: nowrap;
}
.center {
  text-align: center;
}

.section-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}
.section-title h2 {
  font-size: 1rem;
}
.section-title .dim {
  font-size: 0.8125rem;
}

/* --------------------------------------------------------------- controls -- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 520;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background 0.12s,
    border-color 0.12s,
    transform 0.08s;
}
.btn:hover {
  background: var(--surface-3);
  color: var(--text);
}
.btn:active {
  transform: translateY(1px);
}
.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
}
.btn svg {
  width: 15px;
  height: 15px;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--on-accent);
}
.btn.ghost {
  border-color: transparent;
  background: transparent;
  color: var(--text-2);
}
.btn.ghost:hover {
  background: var(--surface-3);
  color: var(--text);
}
.btn.danger {
  color: var(--bad);
  border-color: var(--bad-border);
}
.btn.danger:hover {
  background: var(--bad-soft);
}
.btn.lg {
  padding: 11px 20px;
  font-size: 0.9375rem;
}
.btn.sm {
  padding: 5px 10px;
  font-size: 0.8125rem;
}
.btn.icon {
  padding: 7px;
}
.btn.block {
  width: 100%;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-full);
  background: var(--surface);
  color: var(--text-2);
  font-size: 0.8125rem;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 0.12s,
    color 0.12s,
    border-color 0.12s;
}
.chip:hover {
  border-color: var(--text-3);
  color: var(--text);
}
.chip[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.chip .n {
  font-variant-numeric: tabular-nums;
  opacity: 0.7;
  font-size: 0.75rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: var(--r-full);
  background: var(--surface-3);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 0.6875rem;
  font-weight: 560;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.badge.ok {
  background: var(--ok-soft);
  border-color: var(--ok-border);
  color: var(--ok);
}
.badge.bad {
  background: var(--bad-soft);
  border-color: var(--bad-border);
  color: var(--bad);
}
.badge.warn {
  background: var(--warn-soft);
  border-color: var(--warn-border);
  color: var(--warn);
}
.badge.info {
  background: var(--info-soft);
  border-color: var(--info-border);
  color: var(--info);
}
.badge.accent {
  background: var(--accent-soft);
  border-color: var(--accent-border);
  color: var(--accent);
}
.badge.dom {
  background: color-mix(in srgb, var(--dc) 13%, transparent);
  border-color: color-mix(in srgb, var(--dc) 32%, transparent);
  color: var(--dc);
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 8px 11px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
}
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}
textarea {
  min-height: 96px;
  resize: vertical;
  line-height: 1.5;
}
label.field {
  display: grid;
  gap: 5px;
  font-size: 0.8125rem;
  color: var(--text-2);
}
label.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  cursor: pointer;
}
label.check input {
  width: auto;
  accent-color: var(--accent);
}

/* ------------------------------------------------------------- indicators -- */

.bar {
  position: relative;
  height: 7px;
  border-radius: var(--r-full);
  background: var(--surface-3);
  overflow: hidden;
}
.bar > i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.bar.tall {
  height: 10px;
}
.bar > i.ok {
  background: var(--ok);
}
.bar > i.warn {
  background: var(--warn);
}
.bar > i.bad {
  background: var(--bad);
}

.ring {
  display: block;
}
.ring circle {
  fill: none;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: center;
}
.ring .track {
  stroke: var(--surface-3);
}
.ring .val {
  transition: stroke-dashoffset 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.stat {
  display: grid;
  gap: 3px;
}
.stat .k {
  font-size: 0.75rem;
  color: var(--text-3);
  font-weight: 520;
}
.stat .v {
  font-size: 1.5rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stat .v small {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 0;
}

.meter-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  align-items: center;
}
.meter-row .lbl {
  font-size: 0.8125rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.meter-row .num {
  font-size: 0.8125rem;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.meter-row .bar {
  grid-column: 1 / -1;
}

/* Mastery heatmap of the 30 objectives */
.heat {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(46px, 1fr));
  gap: 5px;
}
.heat button {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface-3);
  cursor: pointer;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  transition:
    transform 0.1s,
    box-shadow 0.1s;
}
.heat button:hover {
  transform: scale(1.09);
  box-shadow: var(--shadow-2);
  z-index: 2;
}
.heat button[data-level="mastered"] {
  background: var(--ok);
  border-color: var(--ok);
  color: var(--on-accent);
}
.heat button[data-level="shaky"] {
  background: var(--warn);
  border-color: var(--warn);
  color: var(--on-accent);
}
.heat button[data-level="weak"] {
  background: var(--bad);
  border-color: var(--bad);
  color: var(--on-accent);
}
.heat button[data-level="thin"] {
  background: var(--surface-3);
  border-style: dashed;
  border-color: var(--border-strong);
}

.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.75rem;
  color: var(--text-2);
}
.legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-right: 5px;
  vertical-align: -1px;
}

/* ------------------------------------------------------------------ table -- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
}
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
table.data th,
table.data td {
  padding: 9px 13px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.data th {
  background: var(--surface-2);
  font-size: 0.75rem;
  font-weight: 620;
  color: var(--text-2);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
  position: sticky;
  top: 0;
}
table.data tr:last-child td {
  border-bottom: 0;
}
table.data tbody tr:hover {
  background: var(--surface-2);
}
table.data td.num,
table.data th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------- question -- */

.q-stem {
  font-size: 1.0625rem;
  line-height: 1.5;
  margin-bottom: 18px;
}
.q-stem code {
  white-space: normal;
}

.opts {
  display: grid;
  gap: 8px;
}

.opt {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  width: 100%;
  padding: 13px 15px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  text-align: left;
  font-size: 0.9375rem;
  line-height: 1.5;
  cursor: pointer;
  transition:
    border-color 0.12s,
    background 0.12s,
    box-shadow 0.12s;
}
.opt:hover:not([data-state]) {
  border-color: var(--accent);
  box-shadow: var(--shadow-1);
}
.opt .key {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  font-size: 0.8125rem;
  font-weight: 620;
  color: var(--text-2);
  flex: none;
}
.opt[data-state] {
  cursor: default;
}
.opt[data-state="correct"] {
  border-color: var(--ok-border);
  background: var(--ok-soft);
}
.opt[data-state="correct"] .key {
  background: var(--ok);
  border-color: var(--ok);
  color: var(--on-accent);
}
.opt[data-state="wrong"] {
  border-color: var(--bad-border);
  background: var(--bad-soft);
}
.opt[data-state="wrong"] .key {
  background: var(--bad);
  border-color: var(--bad);
  color: var(--on-accent);
}
.opt[data-state="muted"] {
  opacity: 0.72;
}
.opt[data-selected="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.opt[data-selected="true"] .key {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.opt .why {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed color-mix(in srgb, var(--text-3) 40%, transparent);
  font-size: 0.8438rem;
  color: var(--text-2);
  line-height: 1.5;
}
.opt .verdict {
  font-weight: 620;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.opt[data-state="correct"] .verdict {
  color: var(--ok);
}
.opt[data-state="wrong"] .verdict {
  color: var(--bad);
}

.callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--text-3);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  padding: 12px 15px;
  font-size: 0.9375rem;
}
.callout .ttl {
  font-size: 0.6875rem;
  font-weight: 640;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 5px;
}
.callout.takeaway {
  border-left-color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--accent-border);
}
.callout.takeaway .ttl {
  color: var(--accent);
}
.callout.ok {
  border-left-color: var(--ok);
  background: var(--ok-soft);
  border-color: var(--ok-border);
}
.callout.warn {
  border-left-color: var(--warn);
  background: var(--warn-soft);
  border-color: var(--warn-border);
}
.callout.info {
  border-left-color: var(--info);
  background: var(--info-soft);
  border-color: var(--info-border);
}
.callout.bad {
  border-left-color: var(--bad);
  background: var(--bad-soft);
  border-color: var(--bad-border);
}

/* ------------------------------------------------------------------- prose -- */

.prose {
  max-width: var(--measure);
  font-size: 0.9375rem;
  line-height: 1.62;
}
.prose > :first-child {
  margin-top: 0;
}
.prose h2,
.prose h3,
.prose h4 {
  margin: 1.5em 0 0.5em;
}
.prose h2 {
  font-size: 1.0625rem;
}
.prose h3 {
  font-size: 0.9688rem;
}
.prose h4 {
  font-size: 0.9063rem;
  color: var(--text-2);
}
.prose ul,
.prose ol {
  margin: 0 0 0.9em;
  padding-left: 1.35em;
}
.prose li {
  margin-bottom: 0.32em;
}
.prose li > ul,
.prose li > ol {
  margin-top: 0.32em;
}
.prose blockquote {
  margin: 0 0 1em;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--border-strong);
  color: var(--text-2);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: 0 0 1em;
}
.prose th,
.prose td {
  border: 1px solid var(--border);
  padding: 7px 10px;
  text-align: left;
  vertical-align: top;
}
.prose th {
  background: var(--surface-2);
  font-weight: 620;
}
.prose img {
  max-width: 100%;
}
.prose strong {
  font-weight: 620;
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1.5em 0;
}
.prose .cb {
  max-width: none;
}

/* Obsidian-style callouts carried over from the source markdown */
.prose .md-callout {
  margin: 0 0 1em;
  padding: 11px 14px;
  border: 1px solid var(--info-border);
  border-left: 3px solid var(--info);
  border-radius: var(--r-sm);
  background: var(--info-soft);
}
.prose .md-callout > .ttl {
  font-size: 0.75rem;
  font-weight: 640;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--info);
  margin-bottom: 4px;
}
.prose .md-callout[data-kind="important"],
.prose .md-callout[data-kind="warning"],
.prose .md-callout[data-kind="caution"] {
  border-color: var(--warn-border);
  border-left-color: var(--warn);
  background: var(--warn-soft);
}
.prose .md-callout[data-kind="important"] > .ttl,
.prose .md-callout[data-kind="warning"] > .ttl,
.prose .md-callout[data-kind="caution"] > .ttl {
  color: var(--warn);
}
.prose .md-callout[data-kind="tip"],
.prose .md-callout[data-kind="success"] {
  border-color: var(--ok-border);
  border-left-color: var(--ok);
  background: var(--ok-soft);
}
.prose .md-callout[data-kind="tip"] > .ttl,
.prose .md-callout[data-kind="success"] > .ttl {
  color: var(--ok);
}

/* ---------------------------------------------------------------- codeblock */

.cb {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-sunk);
  overflow: hidden;
  margin: 0 0 1em;
}
.cb-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px 6px 12px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-2);
}
.cb-head .path {
  font-family: var(--mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cb-head .sym {
  color: var(--accent);
  font-family: var(--mono);
}
.cb pre {
  margin: 0;
  padding: 12px 14px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  tab-size: 4;
}
.cb pre code {
  font-size: inherit;
}

/* Tokens produced by ui/highlight.js */
.tk-kw {
  color: var(--d3);
  font-weight: 560;
}
.tk-str {
  color: var(--d5);
}
.tk-num {
  color: var(--d4);
}
.tk-com {
  color: var(--text-3);
  font-style: italic;
}
.tk-fn {
  color: var(--d2);
}
.tk-cls {
  color: var(--d4);
  font-weight: 560;
}
.tk-dec {
  color: var(--accent);
}
.tk-cst {
  color: var(--d1);
}

/* -------------------------------------------------------------------- steps */

.steps {
  display: grid;
  gap: 10px;
  counter-reset: step;
}
.step {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.14s;
}
.step[data-open="true"] {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-1);
}
.step[data-done="true"] {
  background: var(--surface-2);
}
.step-head {
  display: grid;
  grid-template-columns: auto 26px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 15px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
}
.step-head:hover {
  background: var(--surface-2);
}
.step-tick {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  flex: none;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r-full);
  background: var(--surface);
  cursor: pointer;
  padding: 0;
  color: transparent;
}
.step-tick svg {
  width: 13px;
  height: 13px;
}
.step-tick:hover {
  border-color: var(--ok);
}
.step[data-done="true"] .step-tick {
  background: var(--ok);
  border-color: var(--ok);
  color: var(--on-accent);
}
.step-n {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: var(--r-sm);
  background: var(--surface-3);
  font-size: 0.75rem;
  font-weight: 620;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.step-title {
  font-size: 0.9375rem;
  font-weight: 540;
  min-width: 0;
}
.step[data-done="true"] .step-title {
  color: var(--text-2);
}
.step-body {
  padding: 2px 15px 16px 15px;
  border-top: 1px solid var(--border);
  display: grid;
  gap: 14px;
}
.step-body > .prose {
  margin-top: 12px;
}
.chev {
  transition: transform 0.16s;
  color: var(--text-3);
}
.step[data-open="true"] .chev {
  transform: rotate(90deg);
}

/* ------------------------------------------------------------------- modal */

.modal-scrim {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgb(0 0 0 / 0.45);
  backdrop-filter: blur(3px);
  animation: fade 0.14s;
}
@keyframes fade {
  from {
    opacity: 0;
  }
}
.modal {
  width: min(560px, 100%);
  max-height: min(80vh, 720px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-3);
  padding: 22px;
  animation: pop 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
.modal.wide {
  width: min(760px, 100%);
}
@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.985);
  }
}
.modal h2 {
  margin-bottom: 6px;
}

/* ------------------------------------------------------------------ palette */

.palette-scrim {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: grid;
  align-items: start;
  justify-items: center;
  padding: 12vh 16px 16px;
  background: rgb(0 0 0 / 0.4);
  backdrop-filter: blur(3px);
  animation: fade 0.12s;
}
.palette {
  width: min(600px, 100%);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-3);
  overflow: hidden;
  animation: pop 0.16s cubic-bezier(0.22, 1, 0.36, 1);
}
.palette input {
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 15px 18px;
  font-size: 0.9375rem;
  background: transparent;
}
.palette input:focus {
  box-shadow: none;
  border-color: var(--border);
}
.palette-list {
  max-height: min(52vh, 440px);
  overflow-y: auto;
  padding: 6px;
}
.palette-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  border: 0;
  border-radius: var(--r-sm);
  background: none;
  text-align: left;
  cursor: pointer;
  font: inherit;
}
.palette-item[aria-selected="true"] {
  background: var(--accent-soft);
}
.palette-item .t {
  font-size: 0.875rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.palette-item[aria-selected="true"] .t {
  color: var(--accent);
  font-weight: 540;
}
.palette-item .s {
  font-size: 0.75rem;
  color: var(--text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.palette-empty {
  padding: 26px;
  text-align: center;
  color: var(--text-3);
  font-size: 0.875rem;
}
.palette-foot {
  display: flex;
  gap: 14px;
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 0.6875rem;
  color: var(--text-3);
}

/* ------------------------------------------------------------------- toast */

.toasts {
  position: fixed;
  z-index: 130;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  gap: 8px;
  justify-items: center;
  pointer-events: none;
}
.toast {
  padding: 9px 16px;
  border-radius: var(--r-full);
  background: var(--text);
  color: var(--bg);
  font-size: 0.875rem;
  box-shadow: var(--shadow-3);
  animation:
    toastin 0.2s cubic-bezier(0.22, 1, 0.36, 1),
    toastout 0.25s ease-in 2.5s forwards;
}
@keyframes toastin {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}
@keyframes toastout {
  to {
    opacity: 0;
    transform: translateY(6px);
  }
}

/* -------------------------------------------------------------------- exam */

.exam-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 216px;
  gap: 22px;
  align-items: start;
}
@media (max-width: 880px) {
  .exam-shell {
    grid-template-columns: minmax(0, 1fr);
  }
}
.exam-side {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  display: grid;
  gap: 12px;
}
.qgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(30px, 1fr));
  gap: 5px;
}
.qgrid button {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface);
  font-size: 0.6875rem;
  font-weight: 560;
  color: var(--text-2);
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  position: relative;
}
.qgrid button:hover {
  border-color: var(--text-3);
}
.qgrid button[data-answered="true"] {
  background: var(--surface-3);
  color: var(--text);
  border-color: var(--border-strong);
}
.qgrid button[data-marked="true"]::after {
  content: "";
  position: absolute;
  top: 2px;
  right: 2px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--warn);
}
.qgrid button[aria-current="true"] {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  color: var(--accent);
}

.timer {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: var(--r-full);
  background: var(--surface-3);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 560;
  font-variant-numeric: tabular-nums;
}
.timer[data-urgency="warn"] {
  background: var(--warn-soft);
  border-color: var(--warn-border);
  color: var(--warn);
}
.timer[data-urgency="critical"] {
  background: var(--bad-soft);
  border-color: var(--bad-border);
  color: var(--bad);
}

/* score gauge */
.gauge {
  display: grid;
  gap: 8px;
}
.gauge-track {
  position: relative;
  height: 30px;
  border-radius: var(--r-sm);
  background: linear-gradient(
    90deg,
    var(--bad-soft) 0%,
    var(--warn-soft) 55%,
    var(--ok-soft) 100%
  );
  border: 1px solid var(--border);
  overflow: hidden;
}
.gauge-pass {
  position: absolute;
  top: -1px;
  bottom: -1px;
  width: 2px;
  background: var(--text);
}
.gauge-pass::after {
  content: "720";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 3px;
  font-size: 0.6875rem;
  font-weight: 620;
  color: var(--text-2);
}
.gauge-val {
  position: absolute;
  top: 3px;
  bottom: 3px;
  border-radius: 3px;
  background: var(--accent);
  transition: width 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* sparkline / trend */
.spark {
  display: block;
  width: 100%;
  height: 56px;
  overflow: visible;
}
.spark path.line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
  /* The viewBox is stretched to the card width, so without this the stroke thins
     and thickens with the container. */
  vector-effect: non-scaling-stroke;
}
.spark line.tick {
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}
.spark path.area {
  fill: color-mix(in srgb, var(--accent) 12%, transparent);
  stroke: none;
}
/* Daily activity bars: cap the width so a single studied day reads as one bar
   rather than a full-width block. */
.activity {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  min-height: 70px;
}
.activity > i {
  display: block;
  flex: 1 1 auto;
  max-width: 22px;
  border-radius: 3px;
  opacity: 0.85;
}

.spark line.pass {
  stroke: var(--text-3);
  stroke-width: 1;
  stroke-dasharray: 3 3;
  vector-effect: non-scaling-stroke;
}

/* ------------------------------------------------------------------- empty */

.empty {
  display: grid;
  gap: 10px;
  justify-items: center;
  text-align: center;
  padding: 52px 20px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--r-lg);
  background: var(--surface-2);
  color: var(--text-2);
}
.empty svg {
  width: 26px;
  height: 26px;
  color: var(--text-3);
}
.empty h3 {
  color: var(--text);
}
.empty p {
  max-width: 44ch;
  font-size: 0.875rem;
}

.loading {
  display: grid;
  place-items: center;
  min-height: 60vh;
  color: var(--text-3);
  font-size: 0.875rem;
}

/* --------------------------------------------------------------- landing -- */

.gate {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
  background:
    radial-gradient(80% 60% at 20% 0%, var(--accent-soft) 0%, transparent 60%),
    var(--bg);
}
.gate-card {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-2);
  padding: 30px 28px;
}
.gate-card h1 {
  font-size: 1.375rem;
}
.profile-list {
  display: grid;
  gap: 6px;
}
.profile-row {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface);
  cursor: pointer;
  text-align: left;
  font: inherit;
}
.profile-row:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.avatar {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: var(--r-full);
  background: var(--accent);
  color: var(--on-accent);
  font-size: 0.8125rem;
  font-weight: 640;
  text-transform: uppercase;
}
.avatar.sm {
  width: 24px;
  height: 24px;
  font-size: 0.6875rem;
}

.who {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: none;
  cursor: pointer;
  font: inherit;
  text-align: left;
}
.who:hover {
  background: var(--surface-3);
}
.who .nm {
  font-size: 0.8125rem;
  font-weight: 540;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.who .sub {
  font-size: 0.6875rem;
  color: var(--text-3);
}

/* print — the cheat sheet and drill card are worth printing */
@media print {
  .sidebar,
  .topbar,
  .toasts {
    display: none !important;
  }
  #app {
    grid-template-columns: 1fr;
  }
  .view {
    padding: 0;
    max-width: none;
  }
  .card {
    break-inside: avoid;
    box-shadow: none;
  }
}