:root {
  --bg: #f7faf8;
  --panel: #ffffff;
  --ink: #101513;
  --muted: #5b6763;
  --line: #dbe5e0;
  --green: #137c5b;
  --teal: #0b8c95;
  --coral: #d84f4f;
  --yellow: #e1b84d;
  --shadow: 0 18px 50px rgb(16 21 19 / 10%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

.site-header {
  align-items: center;
  background: rgb(247 250 248 / 92%);
  border-bottom: 1px solid rgb(219 229 224 / 72%);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  min-height: 76px;
  padding: 14px clamp(16px, 5vw, 72px);
  position: sticky;
  top: 0;
  z-index: 30;
}

.brand {
  align-items: center;
  display: flex;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  align-items: center;
  background: var(--ink);
  border-radius: 8px;
  color: #ffffff;
  display: inline-flex;
  font-weight: 800;
  height: 40px;
  justify-content: center;
  line-height: 1;
  flex: 0 0 40px;
  width: 40px;
}

.brand-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand strong {
  letter-spacing: 0;
  line-height: 1;
}

.brand small {
  color: var(--muted);
  display: block;
  font-size: 12px;
  line-height: 1.25;
  white-space: nowrap;
}

.nav-links,
.hero-actions,
.course-tile-top,
.question-card-top,
.course-header,
.lesson-row,
.chapter-heading,
.metrics,
.page-actions,
.lesson-actions,
.form-actions {
  align-items: center;
  display: flex;
}

.nav-links {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 12px 36px rgb(16 21 19 / 8%);
  gap: 4px;
  max-width: 100%;
  padding: 5px;
}

.nav-item,
.nav-action {
  align-items: center;
  border-radius: 8px;
  color: var(--muted);
  display: inline-flex;
  font-size: 14px;
  font-weight: 850;
  justify-content: center;
  line-height: 1;
  min-height: 38px;
  padding: 0 12px;
  transition:
    background-color 150ms ease,
    border-color 150ms ease,
    color 150ms ease;
  white-space: nowrap;
}

.nav-item:hover,
.nav-item:focus,
.nav-action:hover,
.nav-action:focus {
  background: #f1f6f4;
  color: var(--ink);
  outline: none;
}

.nav-item.is-active {
  background: var(--ink);
  color: #ffffff;
}

.nav-form {
  margin: 0;
}

.nav-action,
.link-button {
  background: none;
  border: 0;
  cursor: pointer;
}

.link-button {
  color: var(--ink);
  padding: 0;
}

.nav-action {
  border: 1px solid transparent;
}

.nav-action:hover,
.nav-action:focus {
  border-color: rgb(216 79 79 / 30%);
  color: var(--coral);
}

.mobile-nav {
  display: none;
  position: relative;
}

.mobile-nav summary {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 10px 28px rgb(16 21 19 / 8%);
  cursor: pointer;
  display: inline-flex;
  height: 44px;
  justify-content: center;
  list-style: none;
  width: 44px;
}

.mobile-nav summary::-webkit-details-marker {
  display: none;
}

.mobile-nav summary:hover,
.mobile-nav summary:focus {
  border-color: rgb(19 124 91 / 35%);
  outline: none;
}

.menu-icon {
  display: grid;
  gap: 4px;
}

.menu-icon span {
  background: var(--ink);
  border-radius: 999px;
  display: block;
  height: 2px;
  width: 18px;
}

.mobile-nav-panel {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 18px 46px rgb(16 21 19 / 14%);
  display: grid;
  gap: 4px;
  padding: 8px;
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  width: min(288px, calc(100vw - 32px));
  z-index: 40;
}

.mobile-nav-panel .nav-item,
.mobile-nav-panel .nav-action {
  justify-content: flex-start;
  min-height: 44px;
  padding: 0 12px;
  width: 100%;
}

.mobile-nav-panel .nav-form {
  width: 100%;
}

.nav-divider {
  background: var(--line);
  display: block;
  height: 1px;
  margin: 4px 2px;
}

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

.button {
  background: var(--green);
  border: 1px solid var(--green);
  border-radius: 8px;
  color: #ffffff;
  cursor: pointer;
  display: inline-flex;
  font-weight: 800;
  justify-content: center;
  padding: 12px 18px;
}

.button.secondary {
  background: #ffffff;
  color: var(--green);
}

.button.danger {
  background: #ffffff;
  border-color: var(--coral);
  color: var(--coral);
}

.hero {
  align-items: stretch;
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.8fr);
  min-height: calc(100vh - 110px);
  padding: 28px clamp(20px, 5vw, 72px) 72px;
}

.hero-copy {
  align-self: center;
  max-width: 760px;
}

.eyebrow {
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  margin: 0 0 14px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  font-size: clamp(44px, 8vw, 92px);
  line-height: 0.95;
  margin: 0;
  max-width: 820px;
}

h2,
h3 {
  margin: 0;
}

.lead {
  color: var(--muted);
  font-size: 20px;
  line-height: 1.6;
  max-width: 680px;
}

.hero-actions {
  gap: 18px;
  margin-top: 32px;
}

.hero-actions span,
.next-step,
.muted {
  color: var(--muted);
}

.inline-link {
  color: var(--green);
  font-weight: 700;
}

.hero-image-wrap {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 420px;
  overflow: hidden;
}

.hero-image-wrap img {
  display: block;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.principles,
.page-intro,
.course-grid,
.question-list,
.chapter-list,
.auth-panel,
.description-band {
  padding: 56px clamp(20px, 5vw, 72px);
}

.principles {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.principles article,
.metrics article,
.course-tile,
.question-card,
.question-detail,
.chapter-block,
.auth-form,
.empty-state,
.description-band {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.principles article {
  padding: 24px;
}

.principles span,
.chapter-heading span,
.lesson-row span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.page-intro h1,
.course-header h1,
.auth-panel h1 {
  font-size: clamp(38px, 6vw, 72px);
}

.page-intro p,
.course-header p,
.auth-panel p,
.description-band p {
  color: var(--muted);
  line-height: 1.6;
  max-width: 760px;
}

.page-actions {
  gap: 16px;
  margin-top: 26px;
}

.page-intro-compact {
  padding-top: 0;
}

.metrics {
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
}

.metrics article {
  min-width: 112px;
  padding: 12px 14px;
}

.metrics span {
  color: var(--green);
  display: block;
  font-size: 24px;
  font-weight: 900;
  line-height: 1;
}

.metrics p {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  margin: 4px 0 0;
}

.course-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  padding-top: 18px;
}

.question-list {
  display: grid;
  gap: 18px;
  padding-top: 18px;
}

.question-browser {
  align-items: start;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  padding: 18px clamp(20px, 5vw, 72px) 56px;
}

.question-browser .question-list {
  padding: 0;
}

.question-toc-toggle {
  display: none;
}

.question-toc {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  max-height: calc(100vh - 110px);
  overflow: auto;
  padding: 16px;
  position: sticky;
  top: 16px;
}

.question-toc summary {
  align-items: center;
  cursor: pointer;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  list-style: none;
}

.question-toc summary::-webkit-details-marker {
  display: none;
}

.question-toc summary::after {
  color: var(--green);
  content: "+";
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
}

.question-toc[open] summary::after {
  content: "-";
}

.question-toc summary span,
.question-toc label {
  font-weight: 900;
}

.question-toc summary small,
.question-toc-count,
.question-toc-empty {
  color: var(--muted);
}

.question-toc summary small {
  font-size: 12px;
  font-weight: 800;
  margin-left: auto;
  white-space: nowrap;
}

.question-toc-body {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.question-toc input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  width: 100%;
}

.question-toc-count,
.question-toc-empty {
  font-size: 13px;
  font-weight: 700;
  margin: 0;
}

.question-toc ol {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.question-toc a {
  background: #f4f8f6;
  border: 1px solid transparent;
  border-radius: 8px;
  display: block;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.35;
  padding: 10px;
}

.question-toc a strong,
.question-card h2 strong,
.question-detail h1 strong,
.question-guidance strong,
.answer-preview strong,
.question-answer strong,
.follow-up-card strong,
.follow-up-summary a strong {
  color: inherit;
  font-weight: 900;
}

.question-toc a mark,
.question-card h2 mark,
.question-detail h1 mark,
.question-guidance mark,
.answer-preview mark,
.question-answer mark,
.follow-up-card mark,
.follow-up-summary mark,
.follow-up-summary a mark {
  background: linear-gradient(transparent 42%, rgb(225 184 77 / 55%) 42%);
  border-radius: 3px;
  color: inherit;
  font-weight: inherit;
  padding: 0 2px;
}

.question-toc a:hover,
.question-toc a:focus {
  border-color: var(--green);
  outline: none;
}

.course-tile {
  min-height: 240px;
  padding: 24px;
}

.question-card,
.question-detail {
  padding: 28px;
}

.question-card {
  display: grid;
  gap: 18px;
  scroll-margin-top: 20px;
}

.question-card:focus {
  outline: 3px solid rgb(19 124 91 / 28%);
  outline-offset: 3px;
}

.answer-preview:focus {
  outline: 3px solid rgb(19 124 91 / 22%);
  outline-offset: 4px;
}

.original-narrative {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.original-narrative summary {
  color: var(--green);
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
  list-style: none;
  width: fit-content;
}

.original-narrative summary::-webkit-details-marker {
  display: none;
}

.original-narrative summary::before {
  content: "+";
  margin-right: 6px;
}

.original-narrative[open] summary::before {
  content: "-";
}

.original-narrative div {
  background: #f7faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  line-height: 1.7;
  margin-top: 10px;
  max-width: 78ch;
  padding: 14px;
}

.original-narrative p {
  margin: 0 0 14px;
}

.original-narrative p:last-child {
  margin-bottom: 0;
}

.question-stories {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
  padding-top: 14px;
}

.question-stories-top {
  align-items: center;
  display: flex;
  gap: 10px;
}

.question-stories h3 {
  font-size: 16px;
}

.question-stories-top span {
  background: #f1f6f4;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  padding: 3px 8px;
}

.question-stories ul {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.question-stories li {
  background: #f7faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
}

.question-stories li p {
  color: var(--muted);
  line-height: 1.55;
  margin: 6px 0 0;
}

.story-create summary {
  color: var(--green);
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
  list-style: none;
  width: fit-content;
}

.story-create summary::-webkit-details-marker {
  display: none;
}

.story-create form {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  max-width: 620px;
}

.story-create label {
  display: grid;
  gap: 6px;
}

.story-create label span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.story-create input,
.story-create textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  width: 100%;
}

.story-create .button {
  justify-self: start;
  padding: 9px 12px;
}

.story-create-panel {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin-top: 24px;
  max-width: 880px;
  padding: 16px;
}

.story-create-panel summary {
  font-size: 15px;
}

.story-create-panel select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  width: 100%;
}

.form-errors,
.errorlist {
  color: var(--coral);
  font-size: 13px;
  font-weight: 800;
  margin: 0;
  padding: 0;
}

.errorlist {
  list-style: none;
}

.back-to-top {
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--green);
  display: inline-flex;
  font-size: 12px;
  font-weight: 900;
  justify-content: center;
  margin-top: 2px;
  padding: 6px 10px;
  width: fit-content;
}

.back-to-top:hover,
.back-to-top:focus {
  border-color: var(--green);
  outline: none;
}

.course-tile-top,
.question-card-top,
.course-header,
.lesson-row,
.chapter-heading {
  justify-content: space-between;
}

.course-tile-top p {
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  margin: 0;
  text-transform: uppercase;
}

.course-tile-top strong {
  color: var(--green);
}

.question-card-top {
  gap: 16px;
}

.question-card-top span,
.question-card-top small {
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.course-tile h2 {
  font-size: 28px;
  margin: 28px 0 12px;
}

.question-card h2 {
  font-size: 26px;
  line-height: 1.32;
}

.course-tile > p {
  color: var(--muted);
  line-height: 1.5;
}

.answer-preview {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  max-width: 78ch;
}

.answer-preview p {
  margin: 0 0 16px;
}

.answer-preview p:last-child {
  margin-bottom: 0;
}

.question-guidance {
  border-left: 4px solid var(--yellow);
  color: var(--muted);
  line-height: 1.7;
  padding-left: 14px;
}

.question-guidance p {
  margin: 0 0 14px;
}

.question-guidance p:last-child {
  margin-bottom: 0;
}

.question-guidance-detail {
  font-size: 18px;
}

.question-parent {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  margin: 0;
}

.question-parent a {
  color: var(--green);
}

.story-question {
  background: #f7faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 10px;
  padding: 16px;
}

.story-question > span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.story-question h3 {
  font-size: 20px;
  line-height: 1.35;
}

.story-question a {
  color: var(--green);
}

.story-question p {
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}

.follow-up-summary {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.follow-up-summary > span,
.follow-up-summary summary {
  color: var(--green);
  display: inline-flex;
  font-weight: 900;
  gap: 8px;
}

.follow-up-summary summary {
  cursor: pointer;
  list-style: none;
}

.follow-up-summary summary::-webkit-details-marker {
  display: none;
}

.follow-up-summary summary::before {
  content: "+";
}

.follow-up-summary[open] summary::before {
  content: "-";
}

.follow-up-summary ul,
.follow-up-summary ol,
.follow-up-list {
  display: grid;
  gap: 10px;
}

.follow-up-summary ul,
.follow-up-summary ol {
  margin: 10px 0 0;
  padding-left: 0;
}

.follow-up-summary li {
  list-style: none;
}

.follow-up-summary a {
  background: #f4f8f6;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: block;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
  padding: 10px 12px;
}

.follow-up-summary small {
  color: var(--muted);
  display: block;
  line-height: 1.5;
  margin-top: 4px;
}

.follow-up-list {
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.follow-up-list h2 {
  font-size: 24px;
}

.follow-up-card {
  background: #f7faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

.follow-up-card.is-current {
  border-color: var(--green);
}

.follow-up-card h3 {
  font-size: 20px;
}

.follow-up-card p {
  color: var(--muted);
  line-height: 1.7;
  margin: 10px 0 0;
}

.search-form {
  display: grid;
  gap: 10px;
  margin-top: 26px;
  max-width: 880px;
}

.search-form label {
  font-weight: 800;
}

.search-form div {
  display: flex;
  gap: 12px;
}

.search-form input {
  border: 1px solid var(--line);
  border-radius: 8px;
  flex: 1;
  min-width: 180px;
  padding: 12px;
}

.search-jump-list {
  display: grid;
  gap: 1px;
  list-style: none;
  margin: 0;
  max-width: 640px;
  padding: 0;
}

.search-jump-list[hidden] {
  display: none;
}

.search-jump-list button {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 5px;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  font-size: 10px;
  gap: 5px;
  line-height: 1.15;
  padding: 1px 4px;
  text-align: left;
  width: 100%;
}

.search-jump-list button:hover,
.search-jump-list button:focus {
  background: #f1f6f4;
  color: var(--ink);
  outline: none;
}

.search-jump-list span {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--green);
  display: inline-flex;
  flex: 0 0 16px;
  font-size: 9px;
  font-weight: 900;
  height: 16px;
  justify-content: center;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
}

.tag-list li {
  background: #f1f6f4;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  padding: 7px 10px;
}

.question-detail {
  display: grid;
  gap: 28px;
  margin: 24px clamp(20px, 5vw, 72px) 56px;
}

.question-detail h1 {
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.18;
  max-width: 960px;
}

.question-answer {
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.question-answer h2,
.question-meta h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.question-answer p {
  line-height: 1.85;
  margin: 0 0 20px;
  max-width: 78ch;
}

.question-answer p:last-child {
  margin-bottom: 0;
}

.next-step {
  display: block;
  margin-top: 24px;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 32px;
}

.course-header {
  gap: 24px;
  padding: 42px clamp(20px, 5vw, 72px);
}

.course-header > div {
  flex: 1;
}

.progress-ring {
  align-items: center;
  aspect-ratio: 1;
  background: #ffffff;
  border: 8px solid var(--yellow);
  border-radius: 50%;
  display: flex;
  flex: 0 0 150px;
  flex-direction: column;
  justify-content: center;
}

.progress-ring span {
  font-size: 34px;
  font-weight: 900;
}

.progress-ring small {
  color: var(--muted);
}

.description-band {
  margin: 0 clamp(20px, 5vw, 72px) 20px;
  padding: 24px;
}

.chapter-list {
  display: grid;
  gap: 22px;
  padding-top: 24px;
}

.chapter-block,
.form-shell,
.inline-form-panel {
  overflow: hidden;
}

.chapter-heading {
  gap: 24px;
  padding: 24px;
}

.chapter-heading p {
  color: var(--muted);
  margin: 6px 0 0;
}

.lesson-list {
  border-top: 1px solid var(--line);
}

.lesson-row {
  gap: 18px;
  padding: 20px 24px;
}

.lesson-row + .lesson-row {
  border-top: 1px solid var(--line);
}

.lesson-row p {
  color: var(--muted);
  margin-bottom: 0;
}

.lesson-row.is-complete {
  background: #eef8f1;
}

.lesson-row strong {
  color: var(--green);
}

.lesson-actions {
  gap: 12px;
}

.note-badge {
  color: var(--teal);
  display: inline-block;
  font-weight: 700;
  margin-top: 8px;
}

.auth-panel {
  align-items: start;
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
}

.auth-form {
  display: grid;
  gap: 10px;
  padding: 24px;
}

.auth-form input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  width: 100%;
}

.auth-form label {
  font-weight: 800;
}

.form-shell,
.inline-form-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.form-shell {
  margin: 0 clamp(20px, 5vw, 72px) 56px;
  padding: 24px;
}

.inline-form-panel {
  margin: 0 clamp(20px, 5vw, 72px) 24px;
  padding: 24px;
}

.inline-form-panel-wide {
  margin-bottom: 56px;
}

.form-shell label,
.inline-form-panel label {
  font-weight: 800;
}

.agent-layout,
.key-grid {
  display: grid;
  gap: 18px;
}

.agent-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 18px clamp(20px, 5vw, 72px) 32px;
}

.agent-panel,
.key-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.agent-panel {
  padding: 24px;
}

.section-heading,
.key-card-top,
.key-actions {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
}

.section-heading {
  margin-bottom: 16px;
}

.section-heading h2,
.key-card h3 {
  font-size: 28px;
}

.stack-form {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.stack-form input,
.stack-form select,
.stack-form textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  width: 100%;
}

.stack-form textarea {
  min-height: 120px;
  resize: vertical;
}

.stack-form label,
.key-meta dt,
.endpoint-list dt {
  font-weight: 800;
}

.form-error {
  color: var(--coral);
  margin-bottom: 0;
}

.secret-band {
  border-left: 4px solid var(--green);
  margin-top: 20px;
  padding-left: 16px;
}

.secret-band code,
.endpoint-list code,
.code-block {
  overflow-wrap: anywhere;
}

.secret-band code {
  color: var(--green);
  display: block;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.5;
}

.endpoint-list,
.key-meta {
  display: grid;
  gap: 14px;
  margin: 18px 0 0;
}

.endpoint-list div,
.key-meta div {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.endpoint-list dd,
.key-meta dd {
  color: var(--muted);
  margin: 6px 0 0;
}

.code-block {
  background: #f1f6f4;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family:
    ui-monospace, SFMono-Regular, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 14px;
  margin: 18px 0 0;
  padding: 16px;
  white-space: pre-wrap;
}

.agent-key-list {
  padding: 0 clamp(20px, 5vw, 72px) 56px;
}

.key-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.key-card {
  min-height: 220px;
  padding: 24px;
}

.status-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  padding: 8px 12px;
  text-transform: uppercase;
}

.status-pill.active {
  border-color: rgb(19 124 91 / 25%);
  color: var(--green);
}

.key-actions {
  margin-top: 22px;
}

.lesson-layout {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  padding-bottom: 56px;
}

.lesson-topbar,
.lesson-switcher,
.lesson-progress-bar {
  align-items: center;
  display: flex;
}

.lesson-topbar {
  justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 72px) 0;
}

.lesson-switcher,
.lesson-progress-bar {
  gap: 12px;
}

.lesson-shell {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.4fr);
  padding: 24px clamp(20px, 5vw, 72px) 56px;
}

.lesson-sidebar,
.lesson-reader,
.lesson-progress-bar,
.lesson-notes {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.lesson-sidebar,
.lesson-reader,
.lesson-notes {
  padding: 24px;
}

.lesson-main {
  display: grid;
  gap: 18px;
}

.lesson-reader h1 {
  font-size: clamp(36px, 5vw, 64px);
  margin-top: 0;
}

.lesson-body p {
  color: var(--ink);
  font-size: 18px;
  line-height: 1.8;
}

.lesson-progress-bar {
  justify-content: space-between;
  padding: 20px 24px;
}

.lesson-outline {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.lesson-outline-section span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.lesson-outline-section h3 {
  margin-top: 8px;
}

.lesson-outline-items {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.lesson-outline-link {
  background: #f4f8f6;
  border: 1px solid transparent;
  border-radius: 8px;
  display: block;
  padding: 14px;
}

.lesson-outline-link strong,
.lesson-outline-link small {
  display: block;
}

.lesson-outline-link small {
  color: var(--muted);
  margin-top: 6px;
}

.lesson-outline-link.is-current {
  border-color: var(--green);
}

.lesson-outline-link.is-complete strong {
  color: var(--green);
}

.lesson-notes {
  padding: 24px;
}

.form-actions {
  gap: 14px;
  justify-content: flex-start;
  margin-top: 12px;
}

.notes-shell,
.note-editor-shell,
.shiplog-shell,
.shiplog-form-shell {
  margin: 0 auto;
  padding: 32px 0 56px;
  width: min(1120px, calc(100vw - 32px));
}

.notes-header,
.shiplog-header {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 20px;
}

.notes-header h1,
.shiplog-header h1,
.shiplog-form-shell h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin: 0;
}

.notes-search,
.notes-metrics,
.shiplog-metrics {
  margin-bottom: 20px;
}

.metrics-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.metrics-grid article {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 16px;
}

.metrics-grid span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.metrics-grid strong {
  color: var(--green);
  display: block;
  font-size: 32px;
  line-height: 1;
  margin-top: 8px;
}

.shiplog-actions,
.shiplog-card-actions {
  align-items: center;
  display: flex;
  gap: 12px;
}

.shiplog-filters {
  align-items: end;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(220px, 1fr) minmax(180px, 240px) auto auto;
  margin-bottom: 20px;
}

.shiplog-filters label {
  display: grid;
  gap: 6px;
  font-weight: 900;
}

.shiplog-filters input,
.shiplog-filters select,
.shiplog-form input,
.shiplog-form select,
.shiplog-form textarea {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  padding: 12px 14px;
  width: 100%;
}

.compact-check,
.checkbox-field {
  align-items: center;
  display: flex;
  gap: 8px;
}

.shiplog-filters .compact-check,
.shiplog-form .checkbox-field {
  align-items: center;
  display: flex;
}

.compact-check input,
.checkbox-field input {
  accent-color: var(--green);
  height: 18px;
  width: 18px;
}

.shiplog-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
}

.shiplog-card,
.packet-copy,
.packet-group {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.shiplog-card {
  display: grid;
  gap: 14px;
  padding: 20px;
}

.shiplog-card-top {
  align-items: start;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.shiplog-card-top span,
.shiplog-card-top small,
.packet-entry span {
  color: var(--teal);
  display: block;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.shiplog-card-top strong {
  border: 1px solid rgb(19 124 91 / 25%);
  border-radius: 999px;
  color: var(--green);
  font-size: 12px;
  padding: 6px 9px;
}

.shiplog-card h2 {
  font-size: 24px;
  line-height: 1.28;
}

.shiplog-entry-copy {
  color: var(--ink);
  line-height: 1.65;
}

.shiplog-entry-copy p {
  margin: 0 0 12px;
}

.shiplog-entry-copy blockquote {
  border-left: 4px solid var(--yellow);
  color: var(--muted);
  margin: 0;
  padding-left: 12px;
}

.shiplog-meta {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 10px;
  margin: 0;
  padding-top: 12px;
}

.shiplog-meta div {
  display: grid;
  gap: 4px;
}

.shiplog-meta dt {
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.shiplog-meta dd {
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
  overflow-wrap: anywhere;
}

.shiplog-card-actions {
  border-top: 1px solid var(--line);
  justify-content: space-between;
  padding-top: 12px;
}

.shiplog-card-actions form {
  margin: 0;
}

.shiplog-form {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 18px;
  padding: 24px;
}

.shiplog-form label {
  display: grid;
  gap: 8px;
  font-weight: 900;
}

.form-grid-two {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.packet-layout {
  align-items: start;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(280px, 0.95fr) minmax(0, 1.05fr);
}

.packet-copy {
  padding: 20px;
  position: sticky;
  top: 16px;
}

.packet-copy .section-heading {
  margin-bottom: 12px;
}

.packet-copy textarea {
  background: #f7faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-family:
    ui-monospace, SFMono-Regular, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 13px;
  line-height: 1.55;
  min-height: 520px;
  padding: 14px;
  resize: vertical;
  width: 100%;
}

.packet-list {
  display: grid;
  gap: 16px;
}

.packet-group {
  display: grid;
  gap: 14px;
  padding: 20px;
}

.packet-group h2 {
  font-size: 22px;
}

.packet-entry {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
  padding-top: 14px;
}

.packet-entry h3 {
  font-size: 20px;
}

.packet-entry p {
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

.packet-entry small {
  color: var(--green);
  font-weight: 800;
}

.note-list {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.note-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 260px;
  padding: 18px;
}

.note-card h2 {
  font-size: 24px;
  line-height: 1.25;
  margin: 0;
}

.note-preview {
  color: var(--ink);
  flex: 1;
  line-height: 1.65;
  max-height: 220px;
  overflow: hidden;
}

.note-preview h2,
.note-preview h3,
.editor-surface h2,
.editor-surface h3 {
  margin: 0.5rem 0;
}

.note-preview p,
.editor-surface p {
  margin: 0.45rem 0;
}

.note-preview ul,
.note-preview ol,
.editor-surface ul,
.editor-surface ol {
  padding-left: 1.25rem;
}

.note-preview blockquote,
.editor-surface blockquote {
  border-left: 4px solid var(--yellow);
  color: var(--muted);
  margin: 0.75rem 0;
  padding-left: 0.9rem;
}

.note-actions {
  align-items: center;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 12px;
  justify-content: space-between;
  padding-top: 12px;
}

.note-actions form {
  margin: 0;
}

.danger-link {
  color: var(--coral);
}

.note-form {
  display: grid;
  gap: 18px;
}

.note-form label {
  display: grid;
  font-weight: 900;
  gap: 8px;
}

.note-form input[type="text"] {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font: inherit;
  padding: 12px 14px;
  width: 100%;
}

.rich-editor {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.editor-toolbar {
  background: #f7faf8;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px;
}

.editor-toolbar button {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  min-height: 34px;
  min-width: 36px;
}

.editor-toolbar button:hover,
.editor-toolbar button:focus {
  border-color: var(--green);
  outline: none;
}

.editor-surface {
  line-height: 1.65;
  min-height: 420px;
  outline: none;
  padding: 18px;
}

.editor-surface:focus {
  box-shadow: inset 0 0 0 2px rgba(46, 125, 79, 0.18);
}

.editor-actions {
  align-items: center;
  display: flex;
  gap: 10px;
}

.form-error {
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
}

@media (max-width: 1040px) {
  .nav-links {
    display: none;
  }

  .mobile-nav {
    display: block;
  }
}

@media (max-width: 840px) {
  .hero-actions,
  .course-header,
  .lesson-row,
  .chapter-heading,
  .metrics,
  .page-actions,
  .lesson-actions,
  .form-actions,
  .lesson-topbar,
  .lesson-switcher,
  .lesson-progress-bar,
  .question-card-top,
  .shiplog-header,
  .shiplog-actions,
  .shiplog-card-actions,
  .search-form div {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .principles,
  .auth-panel,
  .agent-layout,
  .lesson-layout,
  .lesson-shell,
  .packet-layout,
  .form-grid-two,
  .shiplog-filters {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-image-wrap {
    min-height: 280px;
  }

  .progress-ring {
    flex-basis: 132px;
  }

  .section-heading,
  .key-card-top,
  .key-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  .search-form input,
  .search-form .button,
  .shiplog-filters .button {
    width: 100%;
  }

  .packet-copy {
    position: static;
  }
}

@media (max-width: 640px) {
  .site-header {
    min-height: 66px;
    padding: 10px 16px;
  }

  .brand-mark {
    flex-basis: 36px;
    height: 36px;
    width: 36px;
  }

  .brand small {
    display: none;
  }

  .question-browser {
    grid-template-columns: 1fr;
    padding-top: 18px;
  }

  .question-toc-toggle {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--green);
    cursor: pointer;
    display: inline-flex;
    font-size: 13px;
    font-weight: 900;
    justify-content: center;
    padding: 10px 12px;
    width: 100%;
  }

  .question-browser[data-toc-hidden="true"] {
    gap: 12px;
  }

  .question-toc {
    max-height: none;
    position: static;
  }
}