/* Our Class Investigation — page styles.
   Self-contained: no web fonts, no third-party CSS. Lexend and Atkinson
   Hyperlegible are named first because they are what the rest of the site uses;
   system fonts carry the page when neither is installed. Light theme only,
   matching the surfaces around it. */

:root {
  --ci-ink: #17202a;
  --ci-muted: #4a5663;
  --ci-line: #cfd9d6;
  --ci-bg: #f4f7f5;
  --ci-card: #ffffff;
  --ci-teal: #0f766e;
  --ci-teal-dark: #0b5a54;
  --ci-navy: #12355b;
  --ci-amber: #8a5a00;
  --ci-amber-bg: #fff6df;
  --ci-ok: #17653a;
  --ci-ok-bg: #e5f5ec;
  --ci-bad: #9c2f2f;
  --ci-focus: #12355b;
  --ci-radius: 14px;
}

body.ci-page *,
.ci-hm,
.ci-hm * {
  box-sizing: border-box;
}

body.ci-page {
  margin: 0;
  background: var(--ci-bg);
  color: var(--ci-ink);
  font:
    1.0625rem/1.6 "Lexend",
    "Atkinson Hyperlegible",
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
}

.ci-page :focus-visible,
.ci-hm :focus-visible {
  outline: 3px solid var(--ci-focus);
  outline-offset: 2px;
}

.ci-skip {
  position: absolute;
  left: 8px;
  top: -60px;
  z-index: 10;
  background: var(--ci-navy);
  color: #fff;
  padding: 10px 14px;
  border-radius: 8px;
}
.ci-skip:focus {
  top: 8px;
}

/* header */
.ci-header {
  background: var(--ci-navy);
  color: #fff;
  padding: 22px 16px 26px;
}
.ci-header-inner,
.ci-main {
  max-width: 980px;
  margin: 0 auto;
}
.ci-header a {
  color: #fff;
  font-weight: 700;
}
.ci-header h1 {
  margin: 8px 0 4px;
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  line-height: 1.15;
}
.ci-header p {
  margin: 0;
  max-width: 62ch;
}
.ci-headrow {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
}
.ci-lang {
  display: inline-flex;
  gap: 6px;
}
.ci-langbtn {
  min-height: 44px;
  min-width: 44px;
  padding: 8px 14px;
  border: 2px solid #fff;
  border-radius: 10px;
  background: transparent;
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.ci-langbtn[aria-pressed="true"] {
  background: #fff;
  color: var(--ci-navy);
}
.ci-header :focus-visible {
  outline-color: #ffd166;
}

.ci-main {
  padding: 18px 16px 64px;
}
.ci-app {
  display: grid;
  gap: 16px;
}
.ci-section:empty {
  display: none;
}

/* cards and text */
.ci-card {
  background: var(--ci-card);
  border: 1px solid var(--ci-line);
  border-radius: var(--ci-radius);
  padding: clamp(14px, 3.5vw, 24px);
  box-shadow: 0 6px 18px rgba(18, 53, 91, 0.06);
}
.ci-card h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
  color: var(--ci-navy);
}
.ci-card h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
  color: var(--ci-navy);
}
.ci-card h4 {
  margin: 14px 0 6px;
  font-size: 1.05rem;
}
.ci-question-title {
  font-size: 1.5rem !important;
}
.ci-bigq {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 4px 0 10px;
}
.ci-small,
.ci-help {
  color: var(--ci-muted);
  font-size: 0.92rem;
  margin: 4px 0 8px;
}
.ci-note {
  background: var(--ci-amber-bg);
  border-left: 5px solid var(--ci-amber);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 8px 0;
}
.ci-note:empty,
.ci-error:empty,
.ci-feedback:empty {
  display: none;
}
.ci-error {
  color: var(--ci-bad);
  font-weight: 700;
  margin: 4px 0;
}
.ci-thanks {
  background: var(--ci-ok-bg);
  border-left: 5px solid var(--ci-ok);
  border-radius: 8px;
  padding: 10px 12px;
  font-weight: 700;
  margin: 0 0 10px;
}
.ci-warn {
  color: var(--ci-bad);
  font-weight: 700;
}
.ci-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* controls */
.ci-btn {
  min-height: 44px;
  padding: 9px 16px;
  border: 2px solid var(--ci-teal-dark);
  border-radius: 10px;
  background: #fff;
  color: var(--ci-teal-dark);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.ci-btn:hover {
  background: #eaf6f4;
}
.ci-btn-primary {
  background: var(--ci-teal-dark);
  color: #fff;
}
.ci-btn-primary:hover {
  background: var(--ci-teal);
}
.ci-btn-quiet {
  border-color: var(--ci-line);
  color: var(--ci-ink);
}
.ci-btn-danger {
  border-color: var(--ci-bad);
  color: var(--ci-bad);
}
.ci-btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}
.ci-page input[type="text"],
.ci-page input[type="number"],
.ci-page input[type="password"],
.ci-hm input[type="text"],
.ci-hm input[type="number"],
.ci-select {
  min-height: 44px;
  padding: 8px 12px;
  border: 2px solid #8a9aa6;
  border-radius: 10px;
  font: inherit;
  background: #fff;
  color: var(--ci-ink);
  max-width: 100%;
}
.ci-codeinput {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  width: 11ch;
  font-weight: 700;
}
.ci-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 8px 0;
}
.ci-chooser {
  display: grid;
  gap: 4px;
  margin: 8px 0;
}
.ci-chooser label,
.ci-field label,
.ci-field legend,
.ci-joinform label {
  font-weight: 700;
}
.ci-joinform {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
}
.ci-joinform label {
  width: 100%;
  margin-bottom: -4px;
}
.ci-field {
  border: 0;
  padding: 0;
  margin: 0 0 14px;
}
.ci-inputrow {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.ci-inputrow input {
  width: 9em;
}
.ci-inline-label {
  font-weight: 700;
}
.ci-unit {
  font-weight: 700;
  color: var(--ci-muted);
}
.ci-tag {
  font-weight: 400;
  color: var(--ci-muted);
}
.ci-choices {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  margin: 6px 0;
}
.ci-choice,
.ci-check {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 8px 12px;
  border: 2px solid var(--ci-line);
  border-radius: 10px;
  cursor: pointer;
}
.ci-choice:has(input:checked) {
  border-color: var(--ci-teal-dark);
  background: #eaf6f4;
}
.ci-choice input,
.ci-check input {
  width: 22px;
  height: 22px;
  flex: none;
}
.ci-check small {
  color: var(--ci-muted);
}
.ci-rule {
  font-weight: 700;
  margin: 0 0 12px;
}
.ci-confirm {
  background: var(--ci-amber-bg);
  border: 2px solid var(--ci-amber);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 10px 0;
}

/* status */
.ci-statusbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.ci-pill {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  border: 2px solid var(--ci-line);
  background: #fff;
  font-size: 0.9rem;
  font-weight: 700;
}
.ci-pill-warn {
  border-color: var(--ci-amber);
  background: var(--ci-amber-bg);
}

/* graph */
.ci-tabs {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ci-tab {
  min-height: 44px;
  padding: 8px 14px;
  border: 2px solid var(--ci-line);
  border-radius: 10px;
  background: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.ci-tab[aria-pressed="true"] {
  background: var(--ci-navy);
  border-color: var(--ci-navy);
  color: #fff;
}
.ci-chartbox {
  background: #fff;
  border: 1px solid var(--ci-line);
  border-radius: 12px;
  padding: 6px;
  margin: 8px 0;
}
.ci-svg {
  width: 100%;
  height: auto;
  display: block;
}
.ci-table summary {
  cursor: pointer;
  min-height: 44px;
  display: flex;
  align-items: center;
  font-weight: 700;
}
.ci-tablewrap {
  overflow-x: auto;
  max-height: 340px;
  overflow-y: auto;
}
.ci-table table {
  border-collapse: collapse;
  width: 100%;
}
.ci-table th,
.ci-table td {
  border: 1px solid var(--ci-line);
  padding: 6px 10px;
  text-align: left;
}
.ci-table thead th {
  background: #eef4f2;
}

/* toolbox */
.ci-tools {
  display: grid;
  gap: 12px;
}
.ci-tool {
  border: 2px solid var(--ci-line);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fff;
}
.ci-tool-off {
  background: #f5f7f6;
}
.ci-tool h4 {
  margin: 0 0 4px;
}
.ci-unit-tag {
  margin: 0;
  font-weight: 800;
  color: var(--ci-teal-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.85rem;
}
.ci-toolbody {
  margin-top: 12px;
  border-top: 2px dashed var(--ci-line);
  padding-top: 12px;
}
.ci-task {
  border: 1px solid var(--ci-line);
  border-radius: 12px;
  padding: 12px;
  margin: 12px 0;
  background: #fbfdfc;
}
.ci-question {
  font-weight: 700;
  margin: 0 0 8px;
}
.ci-feedback {
  margin-top: 8px;
  padding: 10px 12px;
  border-radius: 8px;
  border-left: 5px solid var(--ci-amber);
  background: var(--ci-amber-bg);
  font-weight: 600;
}
.ci-feedback[data-kind="ok"] {
  border-color: var(--ci-ok);
  background: var(--ci-ok-bg);
}
.ci-feedback[data-kind="close"] {
  border-color: var(--ci-navy);
  background: #e8f0f9;
}
.ci-feedback[data-kind="ok"]::before {
  content: "✓ ";
}
.ci-dotline {
  background: #eef4f2;
  border-radius: 10px;
  padding: 10px 12px;
}
.ci-sorted {
  background: #eef4f2;
  border-radius: 10px;
  padding: 10px 12px;
  word-break: break-word;
}
.ci-plothost {
  margin-top: 10px;
}

/* teacher */
.ci-teacher summary {
  cursor: pointer;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ci-navy);
  min-height: 44px;
  display: flex;
  align-items: center;
}
.ci-bigcode {
  font-size: clamp(2rem, 9vw, 3.2rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  margin: 6px 0;
  color: var(--ci-navy);
}
.ci-qr svg {
  max-width: 180px;
  height: auto;
}
.ci-invlist {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 10px;
}
.ci-invrow {
  border: 2px solid var(--ci-line);
  border-radius: 12px;
  padding: 10px 12px;
}
.ci-invrow .ci-pill {
  margin-left: 8px;
}
.ci-danger summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ci-bad);
  min-height: 44px;
  display: flex;
  align-items: center;
}

@media (max-width: 640px) {
  .ci-wrapnarrow {
    flex-direction: column;
    align-items: stretch;
  }
  .ci-btn,
  .ci-select {
    width: 100%;
  }
  .ci-tabs {
    width: 100%;
  }
  .ci-tab {
    flex: 1 1 45%;
  }
  .ci-inputrow input {
    width: 100%;
  }
  .ci-langbtn {
    width: auto;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .ci-btn,
  .ci-tab {
    transition: background-color 0.12s ease;
  }
}

@media print {
  .ci-header,
  .ci-teacher,
  .ci-skip {
    display: none;
  }
  body.ci-page {
    background: #fff;
  }
  .ci-card {
    box-shadow: none;
    break-inside: avoid;
  }
}