:root {
  --bg: #f7f5ef;
  --panel: #fffdf7;
  --panel-2: #eef5f1;
  --text: #20211f;
  --muted: #696c66;
  --line: #d9d7cc;
  --accent: #146c5f;
  --accent-2: #a43f2f;
  --ink: #101211;
  --shadow: 0 16px 40px rgba(30, 33, 31, 0.09);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(20, 108, 95, 0.08), transparent 320px),
    var(--bg);
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid rgba(16, 18, 17, 0.12);
  background: rgba(247, 245, 239, 0.94);
  backdrop-filter: blur(16px);
}

.brand {
  font-weight: 760;
  letter-spacing: 0;
}

.nav {
  display: flex;
  gap: 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(24px, 5vw, 56px) clamp(16px, 4vw, 40px) 64px;
}

.hero {
  display: grid;
  gap: 18px;
  max-width: 850px;
  min-height: 42vh;
  align-content: center;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 5.6rem);
  max-width: 900px;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}

h3 {
  font-size: 1.08rem;
}

p {
  line-height: 1.72;
}

.hero-copy {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.08rem;
}

.actions,
.lesson-nav,
.catalog-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.small {
  min-height: 36px;
  padding: 0 12px;
  font-size: 0.9rem;
}

.button.wide {
  width: 100%;
}

.button.disabled {
  opacity: 0.45;
  pointer-events: none;
}

.button.complete {
  background: var(--accent-2);
  border-color: var(--accent-2);
}

.dashboard {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0 48px;
}

.metric,
.phase-card,
.catalog-phase,
.lesson-card,
.lesson-sidebar {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.metric {
  padding: 18px;
}

.metric strong {
  display: block;
  font-size: 2rem;
}

.metric span,
.phase-progress,
.lesson-meta,
.tags,
.lesson-row small {
  color: var(--muted);
}

.section-head,
.phase-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
}

.phase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.phase-card {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.phase-card p {
  margin: 0;
  color: var(--muted);
}

.phase-number {
  color: var(--accent);
  font-weight: 800;
  font-size: 0.78rem;
}

.page-head {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}

.search {
  display: grid;
  gap: 6px;
  min-width: min(420px, 100%);
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.search.compact {
  min-width: 0;
}

input[type="search"],
input[type="text"],
input[type="email"],
input[type="url"],
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  padding: 0 12px;
  font: inherit;
}

.catalog-list {
  display: grid;
  gap: 18px;
}

.catalog-phase {
  padding: 18px;
}

.phase-heading {
  align-items: start;
  flex-direction: column;
  margin-bottom: 18px;
}

.phase-heading span {
  color: var(--accent);
  font-weight: 800;
}

.phase-heading p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
}

.lesson-list {
  display: grid;
  gap: 8px;
}

.lesson-row {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 8px 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.lesson-row small,
.lesson-row .tags {
  grid-column: 2;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--line);
}

.lesson-row.done .status-dot {
  background: var(--accent);
}

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

.tags em {
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--panel-2);
  font-size: 0.78rem;
  font-style: normal;
}

.lesson-shell {
  display: grid;
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  gap: 18px;
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(16px, 4vw, 36px);
}

.lesson-sidebar,
.lesson-card {
  padding: 18px;
}

.lesson-sidebar {
  position: sticky;
  top: 78px;
  display: grid;
  gap: 16px;
  align-self: start;
}

.lesson-card {
  min-width: 0;
}

.markdown {
  max-width: 860px;
}

.markdown h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  margin-bottom: 24px;
}

.markdown h2 {
  margin-top: 32px;
  margin-bottom: 10px;
}

.markdown h3 {
  margin-top: 24px;
}

.markdown p,
.markdown li {
  color: #30332f;
}

.markdown ul {
  padding-left: 22px;
}

.markdown pre {
  overflow: auto;
  padding: 14px;
  border-radius: var(--radius);
  background: #17201d;
  color: #effaf4;
}

.markdown code {
  border-radius: 4px;
  background: rgba(20, 108, 95, 0.1);
  padding: 2px 5px;
}

.markdown pre code {
  background: transparent;
  padding: 0;
}

.check {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 8px 0;
}

.check-list {
  display: grid;
  gap: 8px;
  margin: 12px 0;
}

.check input {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  min-height: 0;
  margin-top: 0.35em;
  padding: 0;
  accent-color: var(--accent);
}

.check span {
  min-width: 0;
  line-height: 1.65;
}

.mini-table {
  width: 100%;
  margin: 14px 0;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.mini-table td {
  padding: 8px 10px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.resource-panel,
.quiz-panel {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.resource-panel a {
  display: block;
  padding: 12px;
  border-radius: var(--radius);
  background: var(--panel-2);
  color: var(--accent);
  font-weight: 700;
}

.file-preview {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.file-preview summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  cursor: pointer;
  color: var(--muted);
  font-weight: 750;
}

.file-preview summary a {
  display: inline-flex;
  flex: 0 0 auto;
  padding: 6px 10px;
  font-size: 0.84rem;
}

.file-preview pre {
  overflow: auto;
  max-height: 460px;
  margin: 0;
  padding: 14px;
  background: #17201d;
  color: #effaf4;
}

.file-preview code {
  white-space: pre;
}

.quiz-question {
  display: grid;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.choice {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  text-align: left;
  padding: 8px 10px;
  cursor: pointer;
}

.choice.correct {
  border-color: var(--accent);
  background: rgba(20, 108, 95, 0.12);
}

.choice.wrong {
  border-color: var(--accent-2);
  background: rgba(164, 63, 47, 0.12);
}

.quiz-explain {
  margin: 4px 0 0;
  color: var(--muted);
}

.error {
  max-width: 720px;
  padding: 32px;
  border: 1px solid var(--accent-2);
  border-radius: var(--radius);
  background: #fff;
}

@media (max-width: 760px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .dashboard {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lesson-shell {
    grid-template-columns: 1fr;
  }

  .lesson-sidebar {
    position: static;
  }
}

@media (max-width: 480px) {
  .dashboard {
    grid-template-columns: 1fr;
  }

  .shell,
  .lesson-shell {
    padding-left: 12px;
    padding-right: 12px;
  }
}