/* Shared by the three stable CCNA study routes. */
:root {
  color: #171717;
  background: #f8f7f3;
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  width: 100%;
  max-width: 100%;
  min-width: 320px;
  overflow-x: hidden;
  overscroll-behavior-x: none;
  background: #f8f7f3;
  scroll-behavior: smooth;
}

body {
  position: relative;
  width: 100%;
  max-width: 100%;
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  overscroll-behavior-x: none;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
  text-underline-offset: 3px;
}

button,
a,
input,
label {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid #171717;
  outline-offset: 3px;
}

.site-header,
.study-shell,
.site-footer {
  width: min(100% - 40px, 760px);
  max-width: 100%;
  min-width: 0;
  margin-inline: auto;
}

#app,
.question,
.question-prompt,
.choice-content,
.answer-key,
.explanation {
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0 9px;
}

.site-header a {
  font-weight: 650;
  text-decoration: none;
}

.site-header a:hover {
  text-decoration: underline;
}

.study-title {
  margin: 0;
  color: #68655f;
  font-size: 0.84rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.3;
  text-align: right;
}

.mode-switch {
  display: flex;
  gap: 24px;
  border-bottom: 1px solid #c9c7c0;
}

.mode-switch a {
  position: relative;
  padding: 7px 0 8px;
  color: #66635e;
  font-size: 0.94rem;
  text-decoration: none;
}

.mode-switch a[aria-current="page"] {
  color: #171717;
}

.mode-switch a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: #171717;
  content: "";
}

.study-status {
  position: relative;
  padding: 8px 0;
  border-bottom: 1px solid #c9c7c0;
}

.status-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
}

.status-tools {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 13px;
  color: #68655f;
  font-size: 0.75rem;
}

.text-button {
  min-height: 0;
  padding: 0;
  border: 0;
  color: #56534e;
  background: transparent;
  font-size: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.tier-list {
  display: flex;
  flex: 1 1 auto;
  align-items: baseline;
  gap: 15px;
  min-width: 0;
  margin: 0;
}

.tier-list div {
  display: flex;
  align-items: baseline;
  gap: 4px;
  white-space: nowrap;
}

.tier-list dt {
  color: #6c6963;
  font-size: 0.72rem;
}

.tier-list abbr {
  text-decoration: underline dotted;
  text-decoration-color: #aaa69d;
  text-underline-offset: 3px;
  cursor: help;
}

.tier-list dd {
  order: -1;
  margin: 0;
  color: #171717;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  font-weight: 650;
}

.tier-help {
  position: relative;
  margin: 0;
  color: inherit;
  font-size: inherit;
  line-height: 1.45;
}

.tier-help summary {
  width: fit-content;
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.tier-help-copy {
  position: absolute;
  z-index: 5;
  top: calc(100% + 9px);
  right: 0;
  width: min(520px, calc(100vw - 40px));
  margin: 0;
  padding: 12px 14px;
  border: 1px solid #c9c7c0;
  border-radius: 3px;
  color: #56534e;
  background: #fff;
  box-shadow: 0 8px 24px rgba(23, 23, 23, 0.08);
}

.tier-help-copy p {
  margin: 0;
}

.tier-help-copy p + p {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid #e3e0da;
}

.tier-help strong {
  color: #34322f;
}

.search-label {
  display: block;
  padding: 22px 0 2px;
}

.search-input {
  width: 100%;
  height: 44px;
  padding: 0 13px;
  border: 1px solid #aaa69d;
  border-radius: 3px;
  color: #171717;
  background: #fff;
}

.search-input::placeholder {
  color: #77736c;
}

.mastery-group {
  min-width: 0;
}

.mastery-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 31px 0 10px;
  border-bottom: 1px solid #8d8981;
}

.mastery-heading h2,
.mastery-heading span {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mastery-heading span {
  color: #69665f;
  font-variant-numeric: tabular-nums;
}

.mastery-group + .mastery-group {
  margin-top: 28px;
}

.question-list .question,
.random-question .question {
  padding: 20px 0 28px;
  border-bottom: 1px solid #d6d3cc;
}

.random-question .question {
  padding-top: 17px;
}

.question-prompt {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.14rem, 2.5vw, 1.32rem);
  line-height: 1.38;
}

.question-prompt > :first-child,
.question-prompt p:first-child {
  margin-top: 0;
}

.question-prompt > :last-child,
.question-prompt p:last-child {
  margin-bottom: 0;
}

.question-prompt img,
.choice-content img,
.answer-key img,
.explanation img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 12px 0;
  border: 1px solid #d6d3cc;
  background: #fff;
}

.question-prompt pre,
.choice-content pre,
.answer-key pre,
.explanation pre,
.question-prompt table,
.choice-content table,
.answer-key table,
.explanation table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
}

.choice-fieldset {
  display: grid;
  gap: 6px;
  min-width: 0;
  margin: 14px 0 0;
  padding: 0;
  border: 0;
}

.matching-fieldset {
  display: grid;
  gap: 6px;
  min-width: 0;
  margin: 14px 0 0;
  padding: 0;
  border: 0;
}

.match-row {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(190px, 0.85fr);
  gap: 14px;
  align-items: center;
  min-width: 0;
  padding: 9px 11px;
  border: 1px solid #c9c7c0;
  border-radius: 3px;
  background: #fff;
}

.match-row.is-correct {
  border-color: #297047;
  background: #f2f8f4;
  box-shadow: inset 3px 0 0 #297047;
}

.match-row.is-wrong {
  border-color: #a84d43;
  background: #fff5f3;
  box-shadow: inset 3px 0 0 #a84d43;
}

.match-prompt {
  min-width: 0;
  line-height: 1.42;
}

.match-select {
  width: 100%;
  min-width: 0;
  min-height: 36px;
  padding: 6px 30px 6px 9px;
  border: 1px solid #aaa69d;
  border-radius: 3px;
  color: #171717;
  background: #fff;
}

.match-select:disabled {
  color: #3d3b37;
  opacity: 1;
}

.choice {
  display: grid;
  grid-template-columns: 20px 16px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 9px 11px;
  border: 1px solid #c9c7c0;
  border-radius: 3px;
  background: #fff;
  line-height: 1.34;
  cursor: pointer;
}

.choice:hover {
  border-color: #706d67;
}

.choice:has(input:checked) {
  border-color: #171717;
  box-shadow: inset 0 0 0 1px #171717;
}

.choice.is-correct {
  border-color: #297047;
  background: #f2f8f4;
  box-shadow: inset 3px 0 0 #297047;
}

.choice.is-wrong {
  border-color: #a84d43;
  background: #fff5f3;
  box-shadow: inset 3px 0 0 #a84d43;
}

.choice input {
  width: 17px;
  height: 17px;
  margin: 2px 0 0;
  accent-color: #171717;
}

.choice-number {
  padding-top: 1px;
  color: #77736c;
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
  text-align: center;
}

.choice-content {
  min-width: 0;
}

.choice-content p {
  margin: 0;
}

.is-image-choice .choice-fieldset {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.is-image-choice .choice {
  min-width: 0;
}

.image-option {
  display: grid;
  gap: 8px;
  justify-items: center;
  min-width: 0;
  text-align: center;
}

.image-option img {
  width: auto;
  max-width: 100%;
  height: 112px;
  max-height: 28vw;
  margin: 0;
  object-fit: contain;
}

.question-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 13px;
}

.button {
  min-height: 38px;
  padding: 7px 14px;
  border: 1px solid #171717;
  border-radius: 3px;
  color: #f8f7f3;
  background: #171717;
  font-weight: 620;
  cursor: pointer;
}

.button:hover:not(:disabled) {
  background: #363432;
}

.button.secondary {
  color: #171717;
  background: transparent;
}

.button.secondary:hover:not(:disabled) {
  background: #eeece6;
}

.button:disabled {
  border-color: #aaa69d;
  color: #e5e2dc;
  background: #aaa69d;
  cursor: not-allowed;
}

.result {
  margin-top: 17px;
  padding: 16px;
  border-left: 3px solid #297047;
  background: #eef4f0;
}

.reference-answer {
  margin-top: 24px;
  padding: 20px 0 0;
  border-top: 1px solid #c9c7c0;
}

.result.is-wrong {
  border-left-color: #a84d43;
  background: #f7eeec;
}

.result-status {
  margin: 0 0 19px;
}

.answer-label,
.explanation-label {
  margin: 0 0 8px;
  color: #5b5852;
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.answer-key,
.explanation {
  line-height: 1.55;
}

.answer-key ul {
  margin: 0;
  padding-left: 22px;
}

.answer-key li + li {
  margin-top: 5px;
}

.matching-key {
  display: grid;
  gap: 0;
  margin: 0;
}

.matching-key div {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(150px, 0.8fr);
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid #c8d5cc;
}

.matching-key div:last-child {
  border-bottom: 0;
}

.matching-key dt,
.matching-key dd {
  margin: 0;
}

.matching-key dd {
  font-weight: 700;
}

.explanation {
  margin-top: 21px;
  padding-top: 19px;
  border-top: 1px solid #c8d5cc;
}

.result.is-wrong .explanation {
  border-top-color: #ddc8c4;
}

.explanation > :first-child:not(.explanation-label) {
  margin-top: 0;
}

.explanation > :last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 36px 0 52px;
  color: #68655f;
  font-size: 0.8rem;
}

.loading-state,
.empty-state,
.error-state {
  margin: 0;
  padding: 36px 0;
  color: #68655f;
}

.error-state {
  color: #8f3931;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 560px) {
  .site-header,
  .study-shell,
  .site-footer {
    width: min(100% - 30px, 760px);
  }

  .site-header {
    flex-direction: column;
    gap: 8px;
    padding-top: 22px;
  }

  .study-title {
    text-align: left;
  }

  .tier-list {
    gap: 7px;
  }

  .tier-list dt {
    font-size: 0.68rem;
  }

  .question-list .question,
  .random-question .question {
    padding-top: 27px;
  }

  .choice {
    padding: 11px;
  }

  .match-row,
  .matching-key div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .match-row {
    padding: 11px;
  }

  .matching-key dd {
    color: #214f35;
  }

  .result {
    margin-inline: -4px;
    padding: 17px 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}