@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=Newsreader:opsz,wght@6..72,700&display=swap");

:root {
  --ink: #1b201f;
  --muted: #65716e;
  --line: #d8dfd9;
  --paper: #fbfaf5;
  --panel: #ffffff;
  --green: #0f766e;
  --red: #b23b2e;
  --blue: #2457a6;
  --gold: #b7791f;
  --wash: #eef4ed;
  --soft: #f4efe3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(15, 118, 110, 0.07) 1px, transparent 1px),
    linear-gradient(180deg, rgba(36, 87, 166, 0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
  font-family: "IBM Plex Sans", sans-serif;
}

a {
  color: var(--blue);
}

.shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
}

header {
  padding: 34px 0 22px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

nav a {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 8px 11px;
  border-radius: 6px;
  font-size: 13px;
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 26px;
  padding: 46px 0 38px;
  align-items: stretch;
}

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

h1 {
  font-family: "Newsreader", serif;
  font-size: clamp(44px, 7vw, 86px);
  line-height: 0.94;
  max-width: 10ch;
}

.lead {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
  margin: 22px 0 0;
}

.hero-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  box-shadow: 0 18px 40px rgba(27, 32, 31, 0.08);
}

.hero-panel h2 {
  font-size: 18px;
  margin-bottom: 14px;
}

.mission-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.metric {
  min-height: 116px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 13px;
  background: linear-gradient(180deg, #fff, #f9fbf7);
}

.metric strong {
  display: block;
  font-size: 28px;
  line-height: 1;
  color: var(--green);
}

.metric span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

section {
  padding: 34px 0;
}

.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.section-title h2 {
  font-family: "Newsreader", serif;
  font-size: clamp(31px, 4vw, 48px);
}

.section-title p {
  color: var(--muted);
  max-width: 440px;
  margin: 0;
  line-height: 1.45;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

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

.card h3 {
  font-size: 18px;
  margin-bottom: 9px;
}

.card p,
.card li {
  color: var(--muted);
  line-height: 1.45;
  font-size: 14px;
}

.card ul {
  padding-left: 18px;
  margin: 10px 0 0;
}

.flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-top: 14px;
}

.step {
  min-height: 118px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 5px solid var(--green);
  border-radius: 8px;
  padding: 13px;
}

.step:nth-child(2) {
  border-top-color: var(--blue);
}

.step:nth-child(3) {
  border-top-color: var(--gold);
}

.step:nth-child(4) {
  border-top-color: var(--red);
}

.step strong {
  display: block;
  font-size: 14px;
}

.step span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 7px;
  line-height: 1.35;
}

.lesson {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  margin-top: 18px;
}

.lesson-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 20px;
  background: linear-gradient(90deg, var(--wash), #fff);
  border-bottom: 1px solid var(--line);
}

.lesson-head h3 {
  font-family: "Newsreader", serif;
  font-size: 34px;
}

.duration {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  padding: 10px 13px;
  font-weight: 700;
  color: var(--green);
}

.lesson-body {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 20px;
  padding: 20px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 11px 9px;
}

th {
  color: var(--muted);
  font-weight: 600;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, monospace;
}

pre {
  background: #17211f;
  color: #e9f5ef;
  border-radius: 8px;
  padding: 14px;
  overflow: auto;
  font-size: 13px;
  line-height: 1.45;
}

.callout {
  border-left: 5px solid var(--green);
  background: var(--wash);
  padding: 14px 16px;
  border-radius: 0 8px 8px 0;
  color: var(--ink);
  line-height: 1.45;
}

.matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.choice {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.choice strong {
  display: block;
  margin-bottom: 8px;
}

.choice p {
  margin: 0;
  color: var(--muted);
  line-height: 1.42;
  font-size: 14px;
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.source-list a {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  text-decoration: none;
  font-weight: 600;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 36px;
  padding: 22px 0 34px;
  color: var(--muted);
}

@media (max-width: 880px) {
  .hero,
  .lesson-body {
    grid-template-columns: 1fr;
  }

  .cards,
  .matrix,
  .source-list,
  .flow {
    grid-template-columns: 1fr;
  }

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

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

  nav,
  .hero-panel {
    display: none;
  }

  section {
    break-inside: avoid;
  }
}