:root {
  color-scheme: light;
  font-family: "Manrope", "Segoe UI", "Trebuchet MS", sans-serif;
  color: #0f172a;
  background: #f6f7fa;
  font-synthesis: none;
  line-height: 1.6;
  --ink: #0f172a;
  --muted: #4a5568;
  --forest: #1e3a8a;
  --forest-soft: #e4ecff;
  --sand: #eef4f3;
  --paper: #ffffff;
  --border: #dce2ef;
  --brand-2: #2aa198;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  color: #e8eefc;
  background: #08101f;
  --ink: #e8eefc;
  --muted: #afbddc;
  --forest: #8db1ff;
  --forest-soft: #253862;
  --sand: #1c2740;
  --paper: #101b32;
  --border: #2a3b67;
  --brand-2: #68d6cb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  overflow-x: clip;
  background:
    radial-gradient(circle at 12% 8%, rgba(42, 161, 152, 0.2), transparent 30rem),
    radial-gradient(circle at 88% 16%, rgba(30, 58, 138, 0.2), transparent 26rem),
    var(--paper);
}

button,
textarea {
  font: inherit;
}

input {
  font: inherit;
}

.learning-shell {
  width: min(880px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.theme-button {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 700;
}

.feedback-fab {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 30;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  color: #fff;
  background: linear-gradient(135deg, var(--forest), var(--brand-2));
  box-shadow: 0 16px 35px rgba(17, 24, 39, 0.09);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-row {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 0.8rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
}

.brand-tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.learning-header,
.module-heading,
.module-action,
.exercise-handoff,
.practice-action,
.continue-action {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
}

.learning-header {
  margin-top: 0.8rem;
}

.learning-header-actions {
  display: grid;
  justify-items: end;
  gap: 0.65rem;
}

@media (max-width: 760px) {
  .learning-header {
    display: block;
  }

  .learning-header-actions {
    justify-items: stretch;
    margin-top: 1rem;
  }
}

.language-switcher {
  display: flex;
  gap: 0.35rem;
}

.locale-button {
  padding: 0.35rem 0.55rem;
  border-color: var(--border);
  color: var(--forest);
  background: transparent;
  font-size: 0.78rem;
}

.locale-button[aria-pressed="true"] {
  border-color: var(--forest);
  background: var(--forest-soft);
}

.eyebrow,
.module-number,
.section-number {
  margin: 0 0 0.25rem;
  color: var(--forest);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.5rem;
  font-family: "Alegreya", "Georgia", serif;
  font-size: clamp(2.35rem, 7vw, 4.2rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

h2 {
  margin-bottom: 0.65rem;
  font-family: "Alegreya", "Georgia", serif;
  font-size: clamp(1.45rem, 4vw, 2rem);
  font-weight: 500;
}

.intro,
.module-description,
.duration,
.module-action p,
.learning-note,
.field-note,
.exercise-handoff p,
.practice-action p,
.continue-action p {
  color: var(--muted);
}

.intro {
  max-width: 42rem;
}

.quiet-link {
  color: var(--forest);
  text-underline-offset: 0.2rem;
}

.lesson-link {
  color: var(--ink);
  text-underline-offset: 0.2rem;
}

.module-card {
  margin-top: 2rem;
  padding: clamp(1.1rem, 4vw, 2rem);
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--paper);
  box-shadow: 0 16px 35px rgba(17, 24, 39, 0.09);
}

.module-heading h2 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 5vw, 2.7rem);
}

.duration {
  flex: 0 0 auto;
  text-align: right;
}

.duration .duration-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.duration-value {
  display: block;
}

.module-description {
  max-width: 48rem;
  margin: 1.25rem 0;
}

.lesson-list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: lessons;
}

.lesson-list li {
  display: grid;
  grid-template-columns: minmax(4.4rem, 5.5rem) minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.75rem;
  border-radius: 0.55rem;
  background: color-mix(in srgb, var(--paper) 94%, var(--forest-soft));
}

.lesson-list span {
  color: var(--forest);
  font-size: 0.78rem;
  font-weight: 750;
}

.module-action {
  align-items: center;
  margin-top: 1.5rem;
}

.module-action p {
  margin: 0;
  font-size: 0.85rem;
}

.primary-link,
button {
  border: 1px solid var(--forest);
  border-radius: 0.55rem;
  padding: 0.6rem 1rem;
  color: #fff;
  background: linear-gradient(135deg, var(--forest), var(--brand-2));
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.primary-link:visited {
  color: #fff;
}

.learning-note {
  margin: 1rem 0 0;
  text-align: center;
  font-size: 0.82rem;
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.2rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
}

.site-footer-links a {
  color: var(--forest);
  font-weight: 700;
  text-underline-offset: 0.2rem;
}

.site-footer-attribution {
  flex-basis: 100%;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer-attribution a {
  color: var(--forest);
  font-weight: 700;
  text-underline-offset: 0.2rem;
}

.breadcrumb {
  display: flex;
  gap: 0.55rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.lesson-tools {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.75rem;
}

.breadcrumb a {
  color: var(--forest);
}

.lesson-header {
  padding: 2.5rem 0 1.25rem;
}

.lesson-share {
  display: grid;
  gap: 0.4rem;
  margin-top: 1rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  background: color-mix(in srgb, var(--paper) 94%, var(--forest-soft));
}

.lesson-share-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.lesson-share-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.lesson-share-actions button {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.28rem 0.64rem;
  color: var(--forest);
  background: color-mix(in srgb, var(--paper) 96%, transparent);
  font-size: 0.74rem;
  font-weight: 700;
}

.lesson-share-status {
  min-height: 1rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.lesson-content {
  display: grid;
  gap: 1rem;
}

.lesson-content > section {
  padding: clamp(1rem, 4vw, 1.6rem);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--paper);
}

.lesson-content p:last-child {
  margin-bottom: 0;
}

blockquote {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--forest);
  background: var(--forest-soft);
}

.distinction {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin: 1rem 0;
}

.distinction div {
  padding: 0.8rem;
  border-radius: 0.55rem;
  background: color-mix(in srgb, var(--sand) 88%, var(--paper));
}

dt {
  color: var(--forest);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

dd {
  margin: 0.3rem 0 0;
}

.exercise-options {
  padding-left: 1.4rem;
}

.exercise-options li {
  margin-bottom: 0.55rem;
}

label {
  display: block;
  margin: 1rem 0 0.35rem;
  font-weight: 700;
}

textarea {
  display: block;
  width: 100%;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.75rem;
  color: var(--ink);
  background: var(--paper);
}

input[type="text"] {
  display: block;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.68rem 0.75rem;
  color: var(--ink);
  background: var(--paper);
}

input[type="text"]::placeholder {
  color: var(--muted);
  opacity: 0.95;
}

textarea::placeholder {
  color: var(--muted);
  opacity: 0.95;
}

textarea:focus,
input[type="text"]:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--forest) 35%, transparent);
  outline-offset: 2px;
}

.module-certificate {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--forest-soft) 80%, transparent), transparent),
    var(--paper);
}

.certificate-eyebrow {
  margin: 0;
  color: var(--forest);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.certificate-intro {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.certificate-form {
  margin-top: 0.7rem;
}

.certificate-preview {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 0.9rem 0 0;
}

.certificate-preview div {
  padding: 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  background: color-mix(in srgb, var(--paper) 94%, var(--forest-soft));
}

.certificate-preview dt {
  font-size: 0.66rem;
}

.certificate-preview dd {
  margin-top: 0.28rem;
  word-break: break-word;
}

.certificate-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.52rem;
  margin-top: 0.85rem;
}

.certificate-actions button {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.32rem 0.82rem;
  color: var(--forest);
  background: color-mix(in srgb, var(--paper) 97%, transparent);
  font-size: 0.76rem;
  font-weight: 700;
}

.certificate-branding {
  margin: 0.85rem 0 0;
  color: var(--forest);
  font-family: "Alegreya", "Georgia", serif;
  font-size: 1.05rem;
  font-weight: 600;
}

.certificate-footer {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.certificate-status {
  min-height: 1rem;
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.field-note {
  margin-top: 0.45rem;
  font-size: 0.78rem;
}

.exercise-handoff {
  align-items: center;
  margin-top: 1rem;
}

.exercise-handoff p {
  margin: 0;
  font-size: 0.8rem;
}

.practice-action,
.continue-action {
  align-items: center;
  margin-top: 0.75rem;
}

.practice-action p,
.continue-action p {
  margin: 0;
  font-size: 0.8rem;
}

.practice-transcript {
  min-height: 5.5rem;
  margin-top: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  background: color-mix(in srgb, var(--paper) 90%, var(--sand));
}

.empty-practice {
  color: var(--muted);
  text-align: center;
}

.practice-message {
  max-width: 90%;
  margin-bottom: 0.75rem;
}

.practice-message:last-child {
  margin-bottom: 0;
}

.practice-message.learner {
  margin-left: auto;
}

.practice-message p {
  margin: 0;
  padding: 0.7rem 0.8rem;
  border-radius: 0.6rem;
  color: var(--ink);
  background: var(--forest-soft);
  white-space: pre-wrap;
}

.practice-message.learner p {
  background: var(--sand);
}

.practice-takeaway {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-style: italic;
}

.takeaway-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
  margin-top: 0.45rem;
}

.takeaway-actions button {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.22rem 0.62rem;
  color: var(--forest);
  background: color-mix(in srgb, var(--paper) 97%, transparent);
  font-size: 0.72rem;
  font-weight: 700;
}

.ask-next-lesson {
  margin-top: 0.8rem;
}

.practice-label {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

button:disabled {
  cursor: default;
  opacity: 0.55;
}

.hidden {
  display: none;
}

#module-return {
  display: inline-block;
  margin-top: 1rem;
}

.next-lesson {
  display: inline-block;
  margin: 1rem 0 0 1rem;
}

#module-return.hidden {
  display: none;
}

.next-lesson.hidden {
  display: none;
}

.lesson-footer {
  padding: 2rem 0 0;
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  text-align: center;
}

@media (max-width: 640px) {
  .learning-shell {
    width: min(100% - 20px, 880px);
    padding: 1.25rem 0 2rem;
  }

  .learning-header,
  .module-heading,
  .module-action,
  .exercise-handoff,
  .practice-action,
  .continue-action {
    align-items: stretch;
    flex-direction: column;
  }

  .theme-button {
    top: -0.55rem;
    left: 0;
  }

  .learning-header-actions {
    justify-items: start;
  }

  .locale-button {
    width: auto;
  }

  .duration {
    text-align: left;
  }

  .lesson-list li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

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

  .certificate-preview {
    grid-template-columns: 1fr;
  }

  .primary-link,
  button {
    width: 100%;
    text-align: center;
  }

  .next-lesson {
    margin-left: 0;
  }

  .practice-message {
    max-width: 96%;
  }
}

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

  .home-topbar,
  .breadcrumb,
  .lesson-share,
  .exercise-handoff,
  .practice-form,
  .practice-transcript,
  .ask-next-lesson,
  #complete-lesson,
  #module-return,
  #next-lesson,
  .certificate-actions,
  .certificate-status,
  .feedback-fab {
    display: none !important;
  }

  .lesson-content > section {
    border: 0;
    box-shadow: none;
    padding: 0;
    background: #fff;
  }

  .module-certificate {
    border: 2px solid #1e3a8a;
    border-radius: 0;
    page-break-inside: avoid;
  }
}