/* StudyGauge design system
   Vernacular: standardized-testing (scantron bubble sheets, red-pen grading,
   gradebooks) — precise, quietly rewarding, never twee. */

:root {
  --color-paper: #EDEFEF;
  --color-surface: #FFFFFF;
  --color-ink: #191B1E;
  --color-graphite: #6B7178;
  --color-graphite-faint: rgba(107, 113, 120, 0.18);
  --color-red-pen: #C22A2A;
  --color-check-green: #2E6E49;
  --color-pencil-blue: #2F4C73;

  --color-graphite-rgb: 107, 113, 120;
  --color-red-pen-rgb: 194, 42, 42;
  --color-check-green-rgb: 46, 110, 73;
  --color-pencil-blue-rgb: 47, 76, 115;

  --color-nav-bg: #191B1E;
  --color-nav-text: #EDEFEF;
  --color-nav-text-muted: rgba(237, 239, 239, 0.72);
  --color-nav-hover-bg: rgba(237, 239, 239, 0.1);
  --color-nav-active-bg: #EDEFEF;
  --color-nav-active-text: #191B1E;

  --shadow-card: 0 1px 2px rgba(25, 27, 30, 0.04), 0 6px 16px rgba(25, 27, 30, 0.04);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-full: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Source Serif 4", serif;
  --font-mono: "IBM Plex Mono", monospace;

  color-scheme: light;
}

/* Night grading: same vernacular, lamp-lit desk instead of daylight paper. */
[data-theme="dark"] {
  --color-paper: #14161A;
  --color-surface: #1E2126;
  --color-ink: #EDEFEF;
  --color-graphite: #9AA0A8;
  --color-graphite-faint: rgba(255, 255, 255, 0.14);
  --color-red-pen: #E2574F;
  --color-check-green: #4FAE7C;
  --color-pencil-blue: #6F9BD1;

  --color-graphite-rgb: 154, 160, 168;
  --color-red-pen-rgb: 226, 87, 79;
  --color-check-green-rgb: 79, 174, 124;
  --color-pencil-blue-rgb: 111, 155, 209;

  --color-nav-bg: #24272D;
  --color-nav-text: #EDEFEF;
  --color-nav-text-muted: rgba(237, 239, 239, 0.65);
  --color-nav-hover-bg: rgba(237, 239, 239, 0.08);
  --color-nav-active-bg: #EDEFEF;
  --color-nav-active-text: #14161A;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 16px rgba(0, 0, 0, 0.3);

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: var(--color-paper);
  color: var(--color-ink);
  margin: 0;
  padding: 0;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-12);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink);
  font-weight: 600;
  margin: 0 0 var(--space-4);
}

h1 { font-size: 1.6rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }

a {
  color: var(--color-pencil-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus {
  outline: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-pencil-blue);
  outline-offset: 2px;
}

/* ---- Top nav ---- */

.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  background: var(--color-nav-bg);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-2) var(--space-2) var(--space-6);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.topnav-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-nav-text);
  letter-spacing: 0.01em;
}

.topnav-logo {
  display: block;
}

.topnav-brand:hover {
  text-decoration: none;
  color: var(--color-nav-text);
}

.topnav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.topnav-link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.88rem;
  color: var(--color-nav-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.topnav-link:hover {
  color: var(--color-nav-text);
  text-decoration: none;
  background: var(--color-nav-hover-bg);
}

.topnav-link.is-active {
  color: var(--color-nav-active-text);
  background: var(--color-nav-active-bg);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  margin-left: var(--space-1);
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-nav-text-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
  color: var(--color-nav-text);
  background: var(--color-nav-hover-bg);
}

.theme-toggle svg {
  width: 17px;
  height: 17px;
}

.theme-toggle .icon-moon {
  display: block;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

/* ---- Flash messages ---- */

.flashes {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.flash {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.92rem;
  border: 1px solid transparent;
}

.flash-success {
  color: var(--color-check-green);
  background: rgba(var(--color-check-green-rgb), 0.1);
  border-color: rgba(var(--color-check-green-rgb), 0.3);
}

.flash-error {
  color: var(--color-red-pen);
  background: rgba(var(--color-red-pen-rgb), 0.08);
  border-color: rgba(var(--color-red-pen-rgb), 0.3);
}

/* ---- Cards ---- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
}

.card + .card {
  margin-top: var(--space-6);
}

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.card-meta {
  color: var(--color-graphite);
  font-size: 0.92rem;
  margin: 0 0 var(--space-4);
}

.card-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.section {
  margin-top: var(--space-8);
}

.section:first-child {
  margin-top: 0;
}

/* ---- Pills / badges ---- */

.pill {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-graphite);
  background: rgba(var(--color-graphite-rgb), 0.1);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
}

.pill-accent {
  color: var(--color-pencil-blue);
  background: rgba(var(--color-pencil-blue-rgb), 0.08);
  border-color: rgba(var(--color-pencil-blue-rgb), 0.25);
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.88rem;
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-6);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-pencil-blue);
  color: #fff;
}

.btn-primary:hover {
  background: #25395c;
  color: #fff;
}

.btn-danger {
  background: transparent;
  border-color: var(--color-red-pen);
  color: var(--color-red-pen);
}

.btn-danger:hover {
  background: var(--color-red-pen);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-graphite-faint);
  color: var(--color-ink);
}

.btn-ghost:hover {
  background: rgba(var(--color-graphite-rgb), 0.1);
  color: var(--color-ink);
}

/* ---- Forms ---- */

form p {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-1);
  margin: 0 0 var(--space-4);
  max-width: 420px;
}

form p:last-child {
  margin-bottom: 0;
}

form label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--color-graphite);
}

input:not([type="submit"]):not([type="button"]), select, textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  width: 100%;
}

textarea {
  resize: vertical;
}

input:focus-visible, select:focus-visible, textarea:focus-visible {
  border-color: var(--color-pencil-blue);
}

/* ---- Form grid / fields ---- */

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5) var(--space-6);
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.field-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.card--auth {
  max-width: 420px;
  margin: 0 auto;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.field--full {
  grid-column: 1 / -1;
}

.field-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--color-graphite);
}

.field-control {
  position: relative;
  display: flex;
}

.field-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  width: 17px;
  height: 17px;
  color: var(--color-graphite);
  pointer-events: none;
}

.field-control--icon .form-input,
.field-control--icon .form-select {
  padding-left: 40px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1.5px solid var(--color-graphite-faint);
  border-radius: var(--radius-sm);
  padding: 10px var(--space-4);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-textarea {
  resize: vertical;
  min-height: 88px;
}

.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
  outline: none;
  border-color: var(--color-pencil-blue);
  box-shadow: 0 0 0 3px rgba(var(--color-pencil-blue-rgb), 0.15);
}

.form-select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 36px;
  cursor: pointer;
}

.field-control--select::after {
  content: "";
  position: absolute;
  right: 15px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--color-graphite);
  border-bottom: 2px solid var(--color-graphite);
  transform: translateY(-65%) rotate(45deg);
  pointer-events: none;
}

.field--invalid .form-input,
.field--invalid .form-select,
.field--invalid .form-textarea {
  border-color: var(--color-red-pen);
}

.field-error {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--color-red-pen);
}

.field-hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--color-graphite);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-graphite-faint);
}

/* ---- Date picker ---- */

.datepicker {
  position: relative;
  display: flex;
  width: 100%;
}

.datepicker-input {
  padding-right: 40px;
}

.datepicker-input::-webkit-calendar-picker-indicator {
  opacity: 0;
  position: absolute;
  right: 0;
  width: 40px;
  height: 100%;
  margin: 0;
  pointer-events: none;
}

.datepicker-trigger {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-graphite);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.datepicker-trigger:hover {
  background: rgba(var(--color-graphite-rgb), 0.12);
  color: var(--color-ink);
}

.datepicker-trigger svg {
  width: 17px;
  height: 17px;
}

.datepicker-panel {
  display: none;
  position: absolute;
  z-index: 20;
  top: calc(100% + 6px);
  left: 0;
  width: 272px;
  background: var(--color-surface);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: var(--space-4);
}

.datepicker-panel.is-open {
  display: block;
}

.datepicker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.datepicker-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.86rem;
  color: var(--color-ink);
}

.datepicker-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-graphite);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.datepicker-nav:hover {
  background: rgba(var(--color-graphite-rgb), 0.12);
  color: var(--color-ink);
}

.datepicker-nav svg {
  width: 15px;
  height: 15px;
}

.datepicker-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-graphite);
  margin-bottom: var(--space-1);
}

.datepicker-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.datepicker-day {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-ink);
  cursor: pointer;
}

button.datepicker-day {
  transition: background-color 0.15s ease, color 0.15s ease;
}

button.datepicker-day:hover {
  background: rgba(var(--color-pencil-blue-rgb), 0.12);
}

.datepicker-day.is-outside {
  color: rgba(var(--color-graphite-rgb), 0.4);
  cursor: default;
}

.datepicker-day.is-today {
  color: var(--color-pencil-blue);
  font-weight: 600;
}

.datepicker-day.is-selected {
  background: var(--color-pencil-blue);
  color: #fff;
}

.datepicker-today {
  display: block;
  width: 100%;
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border: none;
  border-top: 1px solid var(--color-graphite-faint);
  background: transparent;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--color-pencil-blue);
  cursor: pointer;
  text-align: center;
}

.datepicker-today:hover {
  text-decoration: underline;
}

/* ---- Tables ---- */

table {
  border-collapse: collapse;
  width: 100%;
}

thead th {
  text-align: left;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-graphite);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--color-graphite-faint);
  white-space: nowrap;
}

tbody td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-graphite-faint);
  vertical-align: top;
}

tbody tr:last-child td {
  border-bottom: none;
}

th.numeric, td.numeric {
  text-align: right;
}

td.mono, th.mono, td.numeric, th.numeric {
  font-family: var(--font-mono);
}

.table-wrap {
  overflow-x: auto;
}

/* ---- Stat cards ---- */

.stat-row {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.stat-card {
  flex: 1 1 160px;
  background: var(--color-surface);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-6);
}

.stat-card--icon {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.stat-card--icon .stat-card-value,
.stat-card--icon .stat-card-label {
  display: block;
}

.stat-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-card-icon svg {
  width: 22px;
  height: 22px;
}

.stat-card-icon--blue {
  background: rgba(var(--color-pencil-blue-rgb), 0.12);
  color: var(--color-pencil-blue);
}

.stat-card-icon--red {
  background: rgba(var(--color-red-pen-rgb), 0.12);
  color: var(--color-red-pen);
}

.stat-card-icon--green {
  background: rgba(var(--color-check-green-rgb), 0.12);
  color: var(--color-check-green);
}

.stat-card-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1;
}

.stat-card-label {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-graphite);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: var(--space-2);
}

/* ---- Bubble-mark bar chart ---- */

.bubble-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.bubble-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-graphite-faint);
}

.bubble-row:last-child {
  border-bottom: none;
}

.bubble-row-label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.9rem;
  min-width: 150px;
  flex-shrink: 0;
}

.bubble-track {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.bubble {
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.bubble.is-filled {
  background: var(--color-pencil-blue);
}

.bubble.is-empty {
  background: transparent;
  border: 1px solid var(--color-graphite);
}

.bubble-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-ink);
  margin-left: var(--space-2);
}

/* ---- Heatmap grid ---- */

.heatmap-wrap {
  overflow-x: auto;
}

.heatmap {
  display: grid;
  gap: var(--space-2);
  width: 100%;
}

.heatmap-corner {
  height: 48px;
}

.heatmap-col-header, .heatmap-row-header {
  font-family: var(--font-display);
  font-variant: small-caps;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-graphite);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 var(--space-1);
}

.heatmap-row-header {
  justify-content: flex-end;
  min-width: 90px;
}

.heatmap-cell {
  width: 100%;
  aspect-ratio: 1 / 1;
  min-width: 0;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
}

.heatmap-cell--empty {
  background: transparent;
  border: 1px solid var(--color-graphite-faint);
  color: var(--color-graphite);
}

.heatmap-cell--low {
  background: rgba(var(--color-red-pen-rgb), 0.25);
  color: var(--color-ink);
}

.heatmap-cell--medium {
  background: rgba(var(--color-red-pen-rgb), 0.55);
  color: #fff;
}

.heatmap-cell--high {
  background: rgba(var(--color-red-pen-rgb), 0.85);
  color: #fff;
}

/* ---- App shell (sidebar layout) ---- */

.app-shell {
  display: flex;
  align-items: flex-start;
  gap: var(--space-8);
}

.sidebar {
  flex: 0 0 210px;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: sticky;
  top: var(--space-6);
}

.sidebar-learning-path-label {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-graphite);
  margin-bottom: var(--space-1);
}

.sidebar-nav,
.sidebar-footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-graphite-faint);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-graphite);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar-link:hover {
  color: var(--color-ink);
  background: rgba(var(--color-graphite-rgb), 0.08);
  text-decoration: none;
}

.sidebar-link.is-active {
  color: var(--color-pencil-blue);
  background: rgba(var(--color-pencil-blue-rgb), 0.1);
}

.sidebar-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.app-main {
  flex: 1 1 0;
  min-width: 0;
}

/* ---- Dashboard ---- */

.dashboard-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.dashboard-header h1 {
  margin: var(--space-1) 0 0;
}

.card--feature {
  border-top: 3px solid var(--color-red-pen);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.dashboard-grid > .card + .card {
  margin-top: 0;
}

/* ---- Chart.js canvases ---- */

.chart-canvas-wrap {
  position: relative;
  height: 220px;
  margin-top: var(--space-4);
}

.chart-canvas-wrap--bubble {
  height: 240px;
}

/* ---- Weakest-categories rank list ---- */

.category-rank-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.category-rank-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-graphite-faint);
}

.category-rank-list li:last-child {
  border-bottom: none;
}

.category-rank-list li.is-hidden {
  display: none;
}

.category-rank-name {
  font-family: var(--font-display);
  font-size: 0.9rem;
}

.category-rank-count {
  font-weight: 600;
  color: var(--color-ink);
  flex-shrink: 0;
}

.btn-link {
  display: inline-block;
  margin-top: var(--space-3);
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-pencil-blue);
  cursor: pointer;
}

.btn-link:hover {
  text-decoration: underline;
}

/* ---- Error-type donut ---- */

.donut-section {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-top: var(--space-4);
}

.donut-chart {
  position: relative;
  width: 160px;
  height: 160px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.donut-chart-center {
  position: absolute;
  inset: 22%;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.donut-chart-total {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1;
}

.donut-chart-total-label {
  font-family: var(--font-display);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-graphite);
  margin-top: 2px;
}

.donut-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1 1 200px;
  min-width: 0;
}

.donut-legend li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.donut-legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.donut-legend-label {
  font-family: var(--font-display);
  font-size: 0.88rem;
  flex: 1 1 auto;
  min-width: 0;
}

.donut-legend-value {
  font-weight: 600;
  color: var(--color-ink);
}

/* ---- Landing page ---- */

.hero {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-8) 0 var(--space-12);
}

.hero-copy {
  flex: 1 1 420px;
  min-width: 0;
}

.hero-logo {
  height: auto;
  width: 280px;
  max-width: 100%;
  margin-bottom: var(--space-4);
}

.hero-headline {
  font-size: 2.3rem;
  line-height: 1.1;
  margin-bottom: var(--space-4);
}

.hero-tagline {
  color: var(--color-graphite);
  font-size: 1.05rem;
  max-width: 46ch;
  margin-bottom: var(--space-6);
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.hero-exam-strip {
  color: var(--color-graphite);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.hero-sample {
  flex: 1 1 340px;
  display: flex;
  justify-content: center;
}

.hero-sample-stack {
  position: relative;
  width: 100%;
  max-width: 380px;
  height: 380px;
}

.hero-sample-card {
  background: var(--color-surface);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
}

.hero-sample-card--heatmap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  transform: rotate(-2deg);
  z-index: 3;
}

.hero-sample-card--donut {
  position: absolute;
  bottom: 8px;
  right: 0;
  width: 220px;
  transform: rotate(3deg);
  z-index: 2;
}

.hero-sample-card--trend {
  position: absolute;
  bottom: 60px;
  left: -12px;
  width: 190px;
  transform: rotate(-4deg);
  z-index: 1;
}

.hero-sample-sparkline {
  width: 100%;
  height: 70px;
  display: block;
}

.donut-section--compact {
  margin-top: var(--space-3);
  justify-content: center;
}

.hero-sample-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-graphite);
  margin: 0 0 var(--space-4);
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-8);
}

.steps-grid,
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.step {
  text-align: center;
}

.step-number {
  display: block;
  font-size: 1.4rem;
  font-weight: 600;
  color: rgba(var(--color-pencil-blue-rgb), 0.35);
  margin-bottom: var(--space-2);
}

.step h3 {
  margin-bottom: var(--space-2);
}

.step p {
  color: var(--color-graphite);
  margin: 0;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-graphite-faint);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature-icon--blue {
  background: rgba(var(--color-pencil-blue-rgb), 0.12);
  color: var(--color-pencil-blue);
}

.feature-icon--red {
  background: rgba(var(--color-red-pen-rgb), 0.12);
  color: var(--color-red-pen);
}

.feature-icon--green {
  background: rgba(var(--color-check-green-rgb), 0.12);
  color: var(--color-check-green);
}

.feature-card h3 {
  margin-bottom: var(--space-2);
}

.feature-card p {
  color: var(--color-graphite);
  margin: 0;
}

.cta-band {
  background: var(--color-nav-bg);
  color: var(--color-nav-text);
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  width: 100vw;
  padding: var(--space-12) max(var(--space-4), calc(50vw - 590px));
  margin-top: var(--space-12);
  box-sizing: border-box;
}

.cta-band-inner {
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
}

.cta-band h2 {
  color: var(--color-nav-text);
}

.cta-band p {
  color: var(--color-nav-text-muted);
  margin-bottom: var(--space-6);
}

/* ---- Empty states ---- */

.empty-state {
  text-align: center;
  color: var(--color-graphite);
  font-style: italic;
  padding: var(--space-6) var(--space-4);
  margin: 0;
}

/* ---- Utilities ---- */

.mono {
  font-family: var(--font-mono);
}

/* ---- Site footer ---- */

.site-footer {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-graphite-faint);
}

.site-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
}

.site-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-ink);
}

.site-footer-brand:hover {
  color: var(--color-ink);
  text-decoration: none;
}

.site-footer-logo {
  display: block;
  opacity: 0.85;
}

.site-footer-links {
  display: flex;
  gap: var(--space-2) var(--space-5);
  flex-wrap: wrap;
}

.site-footer-links a {
  color: var(--color-graphite);
  font-size: 0.86rem;
}

.site-footer-links a:hover {
  color: var(--color-ink);
}

.site-footer-copy {
  width: 100%;
  color: var(--color-graphite);
  font-size: 0.78rem;
  margin: 0;
}

/* ---- Error pages ---- */

.error-page {
  text-align: center;
  max-width: 480px;
  margin: var(--space-12) auto;
}

.error-code {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-graphite);
  margin: 0 0 var(--space-2);
}

.error-message {
  color: var(--color-graphite);
  margin-bottom: var(--space-6);
}

.error-actions {
  display: flex;
  justify-content: center;
}

/* ---- Legal pages (Terms, Privacy) ---- */

.legal-page {
  max-width: 720px;
  margin: 0 auto;
}

.legal-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-graphite);
  margin-bottom: var(--space-8);
}

.legal-intro {
  color: var(--color-graphite);
  font-size: 1.02rem;
  margin-bottom: var(--space-8);
}

.legal-page h2 {
  margin-top: var(--space-8);
}

.legal-page section:first-of-type h2 {
  margin-top: 0;
}

.legal-page p {
  color: var(--color-graphite);
  margin: 0 0 var(--space-4);
}

.legal-page ul,
.legal-page ol {
  color: var(--color-graphite);
  margin: 0 0 var(--space-4);
  padding-left: 1.3em;
}

.legal-page li {
  margin-bottom: var(--space-2);
}

.legal-page li:last-child {
  margin-bottom: 0;
}

.legal-page strong {
  color: var(--color-ink);
}

/* ---- About page ---- */

.about-hero {
  text-align: center;
  max-width: 640px;
  margin: var(--space-6) auto var(--space-4);
}

.about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-pencil-blue);
  margin-bottom: var(--space-4);
}

.about-hero h1 {
  font-size: 2rem;
  line-height: 1.15;
}

.about-hero p {
  color: var(--color-graphite);
  font-size: 1.05rem;
}

.about-story {
  max-width: 640px;
  margin: 0 auto;
}

.about-story p {
  color: var(--color-graphite);
  margin-bottom: var(--space-4);
}

.about-story p:last-child {
  margin-bottom: 0;
}

.value-strip {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin: var(--space-6) 0;
}

/* ---- Responsive ---- */

@media (max-width: 640px) {
  .topnav {
    flex-direction: column;
    align-items: stretch;
    border-radius: var(--radius-md);
    padding: var(--space-4);
    gap: var(--space-3);
  }

  .topnav-brand {
    text-align: center;
  }

  .topnav-links {
    justify-content: center;
  }

  .card {
    padding: var(--space-4);
  }

  .stat-row {
    flex-direction: column;
  }

  .bubble-row-label {
    min-width: 100%;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .app-shell {
    flex-direction: column;
    gap: var(--space-4);
  }

  .sidebar {
    position: static;
    width: 100%;
  }

  .sidebar-nav,
  .sidebar-footer {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar-footer {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    flex-direction: column;
    text-align: center;
  }

  .site-footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .hero-sample-stack {
    max-width: 300px;
    height: 300px;
  }

  .hero-sample-card--donut {
    width: 170px;
  }

  .hero-sample-card--trend {
    width: 150px;
    bottom: 44px;
  }

  .hero-actions,
  .hero-exam-strip {
    justify-content: center;
  }

  .hero-tagline {
    max-width: none;
  }

  .steps-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .app-shell {
    flex-direction: column;
  }

  .sidebar {
    position: static;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-4);
  }

  .sidebar-nav,
  .sidebar-footer {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar-footer {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}