:root {
  color-scheme: light;
  --bg: #eef4e8;
  --surface: #f8fbf4;
  --surface-strong: #ffffff;
  --text: #163221;
  --muted: #476350;
  --line: #cdddc8;
  --accent: #85b24a;
  --accent-deep: #3e6f3f;
  --accent-soft: #e4efd7;
  --shadow: rgba(27, 58, 35, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #f6fbef 0, #eef4e8 38%, #e5eee0 100%);
  color: var(--text);
}

a {
  color: var(--accent-deep);
}

img {
  max-width: 100%;
}

.page-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 96px 0 40px;
}

.page-shell-detail {
  padding-top: 32px;
}

.hero,
.objective-section,
.worksheet-panel,
.objective-card,
.objective-nav {
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 18px 44px var(--shadow);
}

.hero {
  position: sticky;
  top: 0;
  z-index: 30;
  width: 100%;
  padding: 10px 0;
  border-left: 0;
  border-right: 0;
  border-radius: 0;
  box-shadow: 0 10px 26px rgba(27, 58, 35, 0.08);
  background: linear-gradient(135deg, rgba(247, 251, 241, 0.97) 0%, rgba(237, 245, 227, 0.97) 52%, rgba(227, 238, 214, 0.97) 100%);
  backdrop-filter: blur(10px);
}

.hero-subpage {
  position: relative;
}

.hero-inner {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.hero-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.hero-logo {
  width: clamp(42px, 5vw, 56px);
  height: auto;
  flex: 0 0 auto;
  filter: drop-shadow(0 6px 10px rgba(39, 79, 42, 0.12));
}

.hero-copy {
  min-width: 0;
}

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

h1 {
  margin-bottom: 6px;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 8px;
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  line-height: 1.05;
}

h3 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.lead,
.card-copy,
.worksheet-panel-head p,
.detail-group p,
.question-diagram-note {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--accent-deep);
  border-radius: 14px;
  background: var(--accent-deep);
  color: white;
  text-decoration: none;
  font-weight: 700;
}

.button-secondary {
  background: white;
  color: var(--accent-deep);
}

.button-disabled {
  border-color: var(--line);
  color: var(--muted);
  background: #f4f7f0;
  pointer-events: none;
}

.header-menu {
  position: relative;
  margin-left: auto;
}

.header-menu summary {
  list-style: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 48px;
  height: 48px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
}

.header-menu summary::-webkit-details-marker {
  display: none;
}

.header-menu summary span {
  display: block;
  width: 100%;
  height: 3px;
  border-radius: 999px;
  background: var(--accent-deep);
}

.header-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 280px;
  max-height: min(70vh, 640px);
  overflow: auto;
  padding: 10px;
  background: rgba(248, 251, 244, 0.98);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 44px var(--shadow);
}

.header-dropdown a,
.objective-nav a {
  display: block;
  text-decoration: none;
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--accent-deep);
  font-weight: 700;
}

.header-dropdown a:hover,
.objective-nav a:hover {
  background: var(--accent-soft);
}

.objective-section,
.worksheet-panel,
.objective-card,
.objective-nav {
  padding: 24px;
}

.intro-section,
.detail-hero,
.objective-nav,
.worksheet-panel,
.objective-card-grid,
.objective-card + .objective-card,
.worksheet-panel + .worksheet-panel {
  margin-top: 20px;
}

.intro-grid,
.detail-grid,
.objective-card-grid {
  display: grid;
  gap: 18px;
}

.intro-grid {
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.9fr);
  align-items: center;
}

.intro-pills,
.detail-badges,
.mini-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.92rem;
  font-weight: 700;
}

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

.objective-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: linear-gradient(180deg, #fcfef9 0%, #f3f8ee 100%);
}

.objective-card-top {
  min-height: 132px;
}

.objective-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-weight: 600;
}

.objective-card-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mini-link {
  font-size: 0.92rem;
  font-weight: 700;
}

.mini-link-muted {
  color: var(--muted);
}

.detail-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.detail-group h3 {
  margin-bottom: 10px;
}

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

.chip-list li {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.95rem;
}

.objective-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px;
}

.worksheet-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.question-list {
  margin: 0;
  padding-left: 1.8rem;
  display: grid;
  grid-template-columns: repeat(var(--worksheet-columns, 1), minmax(0, 1fr));
  column-gap: 4.0rem;
  row-gap: var(--worksheet-row-gap, 1.2rem);
  align-items: start;
}

.question-list li {
  line-height: 1.55;
  padding-right: 0.4rem;
}

.blank-line {
  display: inline-block;
  min-width: 7rem;
  border-bottom: 2px solid var(--line);
  transform: translateY(-0.1em);
}

.question-diagram-note {
  font-style: italic;
}

.web-diagram-wrap {
  margin-top: 0.8rem;
}

.web-diagram {
  display: block;
  max-width: min(100%, 760px);
  width: auto;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
}

@media (max-width: 820px) {
  .page-shell {
    width: min(100% - 20px, 1160px);
    padding-top: 88px;
  }

  .question-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1.4rem;
  }

  .page-shell-detail {
    padding-top: 20px;
  }

  .hero-inner {
    width: min(100% - 20px, 1160px);
    gap: 12px;
    align-items: flex-start;
  }

  .intro-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .worksheet-panel-head {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 8px 0;
  }

  .question-list {
    grid-template-columns: 1fr;
    row-gap: 1rem;
  }

  .hero-brand {
    gap: 10px;
  }

  .hero-logo {
    width: 40px;
  }

  .header-menu summary {
    width: 42px;
    height: 42px;
    padding: 0 10px;
  }

  .header-dropdown {
    min-width: min(260px, calc(100vw - 28px));
    right: -4px;
  }

  .objective-section,
  .worksheet-panel,
  .objective-card,
  .objective-nav {
    padding: 20px;
    border-radius: 20px;
  }

  .button {
    width: 100%;
  }

  .objective-nav {
    grid-template-columns: 1fr;
  }
}