:root {
  --bg: #f6f1e8;
  --bg-soft: rgba(255, 255, 255, 0.58);
  --paper: rgba(255, 252, 247, 0.88);
  --ink: #1f2a37;
  --muted: #56606c;
  --line: rgba(31, 42, 55, 0.12);
  --accent: #b85c38;
  --accent-deep: #8f3f21;
  --accent-soft: #f0d5c6;
  --highlight: #284b63;
  --shadow: 0 18px 50px rgba(31, 42, 55, 0.08);
  --radius: 22px;
  --radius-sm: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(184, 92, 56, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(40, 75, 99, 0.12), transparent 32%),
    linear-gradient(180deg, #f8f2e7 0%, #f5ede1 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.3) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.2;
}

.page-shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.hero {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  background:
    linear-gradient(135deg, rgba(255, 250, 244, 0.94), rgba(255, 246, 236, 0.78)),
    var(--paper);
  box-shadow: var(--shadow);
}

.eyebrow,
.day-date {
  margin: 0;
  font-size: 0.84rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.hero-copy {
  max-width: 720px;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", serif;
  line-height: 1.05;
}

h1 {
  margin-top: 0.4rem;
  font-size: clamp(2.6rem, 6vw, 5rem);
}

h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
}

h3 {
  font-size: 1.3rem;
}

.lead,
.hero p,
.card p,
.task-card p,
li,
dd,
dt,
blockquote {
  line-height: 1.6;
}

.lead {
  margin: 1rem 0 0;
  max-width: 58ch;
  font-size: 1.1rem;
  color: var(--muted);
}

.hero-panels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

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

.panel {
  padding: 1.4rem;
}

.panel.accent {
  background:
    linear-gradient(180deg, rgba(184, 92, 56, 0.14), rgba(255, 249, 244, 0.95)),
    var(--paper);
}

.subpage-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.subpage-nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(40, 75, 99, 0.08);
  color: var(--highlight);
  text-decoration: none;
  font-weight: 600;
}

.subpage-nav a:hover,
.subpage-nav a:focus-visible {
  color: var(--accent-deep);
  background: rgba(184, 92, 56, 0.12);
}

.section-nav {
  position: sticky;
  top: 0.75rem;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.2rem 0 1.8rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 250, 244, 0.84);
  backdrop-filter: blur(18px);
}

.section-nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.section-nav a:hover,
.section-nav a:focus-visible {
  color: var(--accent-deep);
}

.overview {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

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

.overview-wide {
  grid-column: 1 / -1;
}

.card,
.task-card {
  padding: 1.4rem;
}

.pill-row,
.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  padding: 0;
  margin: 1.1rem 0 0;
  list-style: none;
}

.pill,
.topic-list li,
.time-chip {
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
}

.pill,
.topic-list li {
  padding: 0.55rem 0.9rem;
  background: rgba(40, 75, 99, 0.08);
  color: var(--highlight);
  font-weight: 600;
}

.topic-list a {
  color: inherit;
  text-decoration: none;
}

.topic-list a:hover,
.topic-list a:focus-visible {
  color: var(--accent-deep);
}

.topic-toggle-list {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.1rem;
}

.topic-toggle {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(40, 75, 99, 0.04);
  overflow: hidden;
}

.topic-toggle[open] {
  background:
    linear-gradient(180deg, rgba(184, 92, 56, 0.08), rgba(255, 252, 247, 0.96)),
    var(--paper);
}

.topic-toggle__label {
  position: relative;
  display: block;
  padding: 1rem 3.2rem 1rem 1rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--highlight);
  list-style: none;
}

.topic-toggle__label::-webkit-details-marker {
  display: none;
}

.topic-toggle__label::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 1rem;
  transform: translateY(-50%);
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgba(184, 92, 56, 0.14);
  color: var(--accent-deep);
  font-size: 1.2rem;
  line-height: 1;
}

.topic-toggle[open] .topic-toggle__label::after {
  content: "-";
}

.topic-toggle__label:hover,
.topic-toggle__label:focus-visible {
  color: var(--accent-deep);
}

.topic-toggle__content {
  padding: 0 1rem 1rem;
  color: var(--muted);
}

.topic-toggle__content p {
  margin: 0;
}

.split-list {
  margin: 1rem 0 0;
}

.split-list div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}

.split-list div:last-child {
  border-bottom: 0;
}

dt {
  font-weight: 600;
}

dd {
  margin: 0;
  color: var(--accent-deep);
  font-weight: 700;
}

.day-section {
  margin-top: 1.4rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  background: rgba(255, 252, 247, 0.72);
}

.day-header {
  max-width: 70ch;
  margin-bottom: 1.2rem;
}

.day-header p:last-child {
  margin: 0.55rem 0 0;
  color: var(--muted);
}

.task-card {
  position: relative;
  padding-top: 3.4rem;
}

.time-chip {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.35rem 0.7rem;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.84rem;
  font-weight: 700;
}

.chip-link {
  text-decoration: none;
}

.chip-link:hover,
.chip-link:focus-visible {
  background: #e8c3ae;
}

.feature-card {
  background:
    linear-gradient(180deg, rgba(40, 75, 99, 0.08), rgba(255, 252, 247, 0.95)),
    var(--paper);
}

.hint {
  color: var(--muted);
  font-style: italic;
}

.timeline {
  padding-left: 1.2rem;
}

blockquote {
  margin: 1rem 0 0;
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
  color: var(--highlight);
}

.topic-list.compact li {
  font-size: 0.95rem;
}

.closing {
  margin-top: 1.4rem;
  text-align: center;
}

.back-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 1.2rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 250, 244, 0.84);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--accent-deep);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.guide-list {
  padding-left: 1.2rem;
  margin: 1rem 0 0;
}

.formula-box {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px dashed rgba(40, 75, 99, 0.3);
  border-radius: var(--radius-sm);
  background: rgba(40, 75, 99, 0.05);
}

.formula-box p + p {
  margin-top: 0.8rem;
}

@media (max-width: 900px) {
  .hero-panels,
  .overview,
  .day-grid,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .section-nav {
    border-radius: 22px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 1rem, 100%);
    padding-top: 0.75rem;
  }

  .hero,
  .day-section,
  .card,
  .task-card {
    border-radius: 18px;
  }

  .hero,
  .day-section {
    padding: 1.2rem;
  }

  h1 {
    font-size: 2.5rem;
  }

  .section-nav {
    top: 0.4rem;
    gap: 0.5rem;
  }
}