:root {
  --bg: #f5f7f6;
  --paper: #ffffff;
  --ink: #17212b;
  --muted: #65717d;
  --line: #d8dedb;
  --accent: #1d6b57;
  --accent-2: #8a6500;
  --soft: #e9f3ef;
  --warn: #fff4d8;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

body {
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.hero {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 18px;
}

.hero p {
  max-width: 880px;
}

.home-tabs {
  display: flex;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.home-tab {
  padding: 11px 16px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.home-tab.active {
  border-bottom-color: var(--accent);
  color: var(--ink);
}

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

.search-panel {
  margin-bottom: 18px;
}

.search-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-top: 16px;
}

.search-form.has-query {
  grid-template-columns: minmax(0, 1fr) 44px auto;
}

.search-form input,
.search-clear,
.search-submit {
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.search-form input {
  width: 100%;
  min-width: 0;
  padding: 10px 13px;
}

.search-form input::-webkit-search-cancel-button {
  appearance: none;
}

.search-form input:focus-visible {
  border-color: var(--accent);
  outline: 2px solid color-mix(in srgb, var(--accent) 24%, transparent);
  outline-offset: 1px;
}

.search-clear,
.search-submit {
  cursor: pointer;
}

.search-clear {
  grid-column: 2;
  grid-row: 1;
  padding: 0;
  font-size: 25px;
  line-height: 1;
}

.search-submit {
  grid-column: 2;
  grid-row: 1;
  padding: 9px 18px;
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.search-form.has-query .search-submit {
  grid-column: 3;
}

.search-clear:hover,
.search-clear:focus-visible {
  background: var(--soft);
}

.search-submit:hover,
.search-submit:focus-visible {
  background: #155846;
}

.search-index-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.search-index-note code {
  color: var(--ink);
  font-weight: 700;
}

.search-status {
  min-height: 24px;
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.search-results {
  margin-top: 4px;
  border-top: 1px solid var(--line);
}

.search-result {
  display: block;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.search-result:hover,
.search-result:focus-visible {
  background: var(--soft);
}

.search-result strong,
.search-result-topic,
.search-result-snippet {
  display: block;
}

.search-result strong {
  color: var(--accent);
  font-size: 17px;
}

.search-result-topic {
  margin-top: 2px;
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 700;
}

.search-result-snippet {
  margin-top: 6px;
  color: var(--ink);
}

.search-result mark {
  padding: 0 2px;
  background: var(--warn);
  color: inherit;
}

.home-tab-panel > .section + .section {
  margin-top: 18px;
}

.quiz-launcher {
  margin-bottom: 18px;
}

.launcher-heading,
.launcher-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.launcher-label {
  margin: 0 0 5px;
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.launcher-heading h2 {
  margin-bottom: 0;
}

.select-all,
.topic-picker label {
  display: flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
}

.select-all {
  flex: 0 0 auto;
  font-weight: 700;
}

.select-all input,
.topic-picker input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.topic-picker {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 20px 0;
}

.topic-picker label {
  min-height: 74px;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  font-size: 13px;
}

.topic-picker label:has(input:checked) {
  border-color: var(--accent);
  background: var(--soft);
}

.topic-picker strong {
  display: block;
  color: var(--accent);
  font-size: 14px;
}

.launcher-footer {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.launcher-footer p {
  margin: 0;
  color: var(--muted);
}

.launcher-footer > div {
  display: flex;
  gap: 8px;
}

.launcher-primary,
.launcher-secondary {
  min-height: 44px;
  padding: 9px 16px;
  border-radius: 6px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.launcher-primary {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
}

.launcher-secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.launcher-primary:disabled,
.launcher-secondary:disabled {
  border-color: #b9c1be;
  background: #e6eae8;
  color: #7a8580;
  cursor: not-allowed;
}

.launcher-error {
  margin: 10px 0 0;
  color: #8b3030;
  font-weight: 700;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(30px, 4vw, 48px);
  letter-spacing: 0;
}

h2 {
  font-size: 25px;
  margin-top: 28px;
}

h3 {
  font-size: 18px;
  margin-top: 20px;
}

p {
  margin: 0 0 12px;
}

.source {
  color: var(--muted);
  font-size: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.card,
.section {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.card h2,
.card h3,
.section h2,
.section h3 {
  margin-top: 0;
}

.tag {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 9px;
  color: var(--muted);
  font-size: 13px;
  margin: 0 6px 6px 0;
}

.exam {
  background: var(--warn);
  border-color: #e4cb8c;
  overflow: hidden;
}

.topic-quiz-cta {
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  margin: 18px 0;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--accent);
  color: #ffffff;
}

.topic-quiz-cta strong,
.topic-quiz-cta > div > span {
  display: block;
}

.topic-quiz-cta strong {
  font-size: 18px;
}

.topic-quiz-cta > div > span {
  margin-top: 2px;
  color: #e5f1ed;
  font-size: 14px;
}

.topic-quiz-button {
  display: inline-flex;
  flex: 0 0 auto;
  gap: 8px;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 9px 14px;
  border-radius: 5px;
  background: #ffffff;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.topic-quiz-button:hover,
.topic-quiz-button:focus-visible {
  background: #eef7f4;
}

.term-list {
  display: grid;
  gap: 10px;
}

.term-list dt {
  font-weight: 700;
  color: var(--accent);
}

.term-list dd {
  margin: 2px 0 0;
}

ul,
ol {
  margin: 8px 0 0;
  padding-left: 22px;
}

li {
  margin: 6px 0;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  background: var(--paper);
  border: 1px solid var(--line);
}

th,
td {
  border: 1px solid var(--line);
  padding: 9px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--soft);
}

.phonetic-alphabet {
  table-layout: fixed;
  margin-top: 16px;
}

.phonetic-alphabet td {
  padding: 10px 12px;
  white-space: nowrap;
}

.phonetic-alphabet strong {
  display: inline-block;
  margin-right: 6px;
  color: var(--accent);
  font-size: 17px;
}

.phonetic-alphabet strong::after {
  content: "—";
  margin-left: 5px;
  color: var(--muted);
  font-weight: 400;
}

.network-comparison-wrap {
  width: 100%;
}

.network-comparison {
  table-layout: fixed;
  font-size: 12px;
  line-height: 1.4;
}

.network-comparison th,
.network-comparison td {
  padding: 8px;
  overflow-wrap: anywhere;
}

.network-comparison th:first-child,
.network-comparison td:first-child {
  width: 12%;
}

.network-comparison th:nth-child(3),
.network-comparison td:nth-child(3),
.network-comparison th:nth-child(4),
.network-comparison td:nth-child(4),
.network-comparison th:nth-child(6),
.network-comparison td:nth-child(6) {
  width: 10%;
}

.network-comparison td:first-child span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
}

.table-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.comparison-key {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 14px 0 8px;
  color: var(--muted);
  font-size: 13px;
}

.comparison-key span::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 6px;
  background: #2f7663;
}

.comparison-key .key-exclusive::before {
  background: #b26a00;
}

.comparison-key .key-neutral::before {
  background: #6b7280;
}

.comparison-key .key-available::before {
  background: #2f7663;
}

.comparison-key .key-missing::before {
  background: #a94242;
}

.model-comparison td:first-child {
  width: 20%;
  font-weight: 700;
}

.model-comparison .key-difference td {
  background: #fff8e8;
}

.availability {
  display: block;
  margin-top: 7px;
  padding: 3px 7px;
  border-left: 3px solid #2f7663;
  background: #edf7f3;
  color: #245d4f;
  font-size: 12px;
  font-weight: 700;
}

.availability.exclusive {
  border-left-color: #b26a00;
  background: #fff3d6;
  color: #744600;
}

.availability.missing {
  border-left-color: #a94242;
  background: #fff0f0;
  color: #7c3030;
}

.feature-values {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.feature-values span {
  padding: 3px 6px;
  border-bottom: 2px solid #9aa5a1;
  background: #f3f6f5;
  color: #33413d;
  font-size: 13px;
  font-weight: 700;
}

.feature-values .feature-available {
  border-bottom-color: #2f7663;
  background: #e8f5f0;
  color: #1f6654;
}

.feature-values .feature-unavailable {
  border-bottom-color: #b84a4a;
  background: #fff0f0;
  color: #913737;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
}

.topic-figure {
  margin: 18px 0;
}

.model-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 18px 0;
}

.model-gallery .topic-figure {
  min-width: 0;
  margin: 0;
}

.model-gallery .topic-figure img {
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: #ffffff;
}

.topic-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.topic-figure figcaption {
  margin-top: 7px;
  color: var(--muted);
  font-size: 13px;
}

.note {
  border-left: 4px solid var(--accent);
  padding: 10px 12px;
  background: var(--soft);
  margin: 14px 0;
}

.menu-path {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  margin: 10px 0 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8faf9;
}

.menu-path span {
  position: relative;
  max-width: 100%;
  padding: 5px 8px;
  border: 1px solid #c9d6d1;
  border-radius: 4px;
  background: #ffffff;
  color: #20493d;
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.menu-path span:not(:last-child)::after {
  content: "→";
  position: absolute;
  left: calc(100% + 6px);
  color: var(--muted);
  font-family: "Segoe UI", Arial, sans-serif;
}

.compact-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 8px;
  padding: 0;
  list-style: none;
}

.compact-options li {
  margin: 0;
  padding: 9px 10px;
  border-left: 3px solid var(--accent);
  background: var(--soft);
  font-weight: 600;
}

.footer {
  color: var(--muted);
  font-size: 13px;
  margin-top: 28px;
}

code {
  background: #eef1f0;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
}

@media (max-width: 800px) {
  .model-gallery {
    grid-template-columns: 1fr;
  }

  .topic-picker {
    grid-template-columns: repeat(2, 1fr);
  }

  .network-comparison,
  .network-comparison tbody,
  .network-comparison tr,
  .network-comparison td {
    display: block;
    width: 100%;
  }

  .network-comparison {
    border: 0;
    background: transparent;
    font-size: 14px;
  }

  .network-comparison thead {
    display: none;
  }

  .network-comparison tr {
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }

  .network-comparison tr:first-child {
    padding-top: 0;
  }

  .network-comparison tr:last-child {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .network-comparison td,
  .network-comparison td:nth-child(n) {
    display: grid;
    grid-template-columns: minmax(104px, 36%) minmax(0, 1fr);
    gap: 12px;
    width: 100%;
    padding: 5px 0;
    border: 0;
  }

  .network-comparison td::before {
    content: attr(data-label);
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
  }

  .network-comparison td:first-child {
    display: block;
    padding-bottom: 8px;
    color: var(--accent);
    font-size: 17px;
  }

  .network-comparison td:first-child::before {
    display: none;
  }

  .network-comparison td:first-child span {
    display: inline;
    margin: 0 0 0 7px;
    font-size: 12px;
    font-weight: 400;
  }

  .responsive-table,
  .responsive-table tbody,
  .responsive-table tr,
  .responsive-table td {
    display: block;
    width: 100%;
  }

  .responsive-table {
    border: 0;
    background: transparent;
  }

  .responsive-table thead {
    display: none;
  }

  .responsive-table tr {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

  .responsive-table tr:first-child {
    padding-top: 0;
  }

  .responsive-table tr:last-child {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .responsive-table td {
    display: grid;
    grid-template-columns: minmax(110px, 35%) minmax(0, 1fr);
    gap: 12px;
    padding: 5px 0;
    border: 0;
    overflow-wrap: anywhere;
  }

  .responsive-table td::before {
    content: attr(data-label);
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
  }

  .model-comparison td:first-child {
    display: block;
    width: 100%;
    padding-top: 8px;
    color: var(--accent);
    font-size: 16px;
  }

  .model-comparison td:first-child::before {
    display: none;
  }

  .phonetic-alphabet,
  .phonetic-alphabet tbody {
    display: block;
  }

  .phonetic-alphabet tbody {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .phonetic-alphabet tr {
    display: contents;
  }

  .phonetic-alphabet td {
    display: grid;
    grid-template-columns: 1.2em 1em minmax(0, 1fr);
    align-items: baseline;
    min-width: 0;
    border-width: 0 1px 1px 0;
    overflow-wrap: anywhere;
    white-space: normal;
  }

  .phonetic-alphabet td::after {
    content: "—";
    grid-column: 2;
    grid-row: 1;
    color: var(--muted);
  }

  .phonetic-alphabet strong {
    grid-column: 1;
    grid-row: 1;
    width: auto;
  }

  .phonetic-alphabet strong::after {
    content: none;
  }

  .phonetic-alphabet td span {
    grid-column: 3;
    grid-row: 1;
  }
}

@media (max-width: 560px) {
  .home-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .home-tab {
    min-width: 0;
    padding: 10px 5px;
    font-size: 13px;
  }

  .search-form {
    grid-template-columns: minmax(0, 1fr);
  }

  .search-form.has-query {
    grid-template-columns: minmax(0, 1fr) 44px;
  }

  .search-form .search-submit,
  .search-form.has-query .search-submit {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .topic-quiz-cta {
    align-items: stretch;
    flex-direction: column;
  }

  .launcher-heading,
  .launcher-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .topic-picker {
    grid-template-columns: 1fr;
  }

  .launcher-footer > div,
  .launcher-primary,
  .launcher-secondary {
    width: 100%;
  }

  .launcher-primary,
  .launcher-secondary {
    flex: 1;
  }

  .menu-path {
    align-items: stretch;
    flex-direction: column;
    gap: 18px;
  }

  .menu-path span {
    width: 100%;
  }

  .menu-path span:not(:last-child)::after {
    top: calc(100% + 2px);
    left: 50%;
    transform: translateX(-50%) rotate(90deg);
  }
}

@media (max-width: 340px) {
  .phonetic-alphabet tbody {
    grid-template-columns: 1fr;
  }
}

@media print {
  body {
    background: #ffffff;
  }

  .page {
    width: 100%;
    padding: 0;
  }

  .topbar,
  .topic-quiz-cta,
  .footer {
    display: none;
  }

  .hero,
  .section,
  .card {
    border-color: #bbbbbb;
    break-inside: avoid;
  }
}