:root {
  color-scheme: light;
  --ink: #172230;
  --ink-soft: #52606d;
  --paper: #f3efe5;
  --paper-deep: #e9e1d2;
  --surface: rgba(255, 253, 247, 0.86);
  --surface-solid: #fffdf7;
  --navy: #15304a;
  --navy-2: #244b69;
  --vermilion: #c84932;
  --vermilion-soft: #f4ddd6;
  --gold: #aa7a22;
  --rule: rgba(23, 34, 48, 0.16);
  --rule-strong: rgba(23, 34, 48, 0.32);
  --shadow: 0 24px 70px rgba(34, 39, 45, 0.12);
  --shadow-small: 0 10px 28px rgba(34, 39, 45, 0.08);
  --phase: #27738e;
  --phase-soft: #d9edf1;
  --display: "Iowan Old Style", "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --body: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Code", "Source Code Pro", monospace;
  --content: 820px;
  --header-h: 66px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e9eced;
  --ink-soft: #a9b3bb;
  --paper: #111a22;
  --paper-deep: #0b1218;
  --surface: rgba(25, 36, 46, 0.86);
  --surface-solid: #18232d;
  --navy: #d7e7ef;
  --navy-2: #9bc4d5;
  --vermilion: #ee765e;
  --vermilion-soft: #4a2925;
  --gold: #ddb35e;
  --rule: rgba(230, 237, 240, 0.15);
  --rule-strong: rgba(230, 237, 240, 0.32);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  --shadow-small: 0 10px 28px rgba(0, 0, 0, 0.24);
  --phase-soft: rgba(62, 139, 165, 0.2);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 12%, color-mix(in srgb, var(--phase) 10%, transparent), transparent 28rem),
    radial-gradient(circle at 92% 20%, color-mix(in srgb, var(--vermilion) 8%, transparent), transparent 24rem),
    repeating-linear-gradient(0deg, transparent 0, transparent 28px, rgba(87, 71, 47, 0.028) 29px),
    var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.24;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.12'/%3E%3C/svg%3E");
}

a {
  color: var(--navy-2);
  text-decoration-color: color-mix(in srgb, var(--navy-2) 40%, transparent);
  text-underline-offset: 0.18em;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

a:hover {
  color: var(--vermilion);
  text-decoration-color: var(--vermilion);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 6px;
  color: #fff;
  background: var(--vermilion);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 80;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--phase), var(--vermilion), var(--gold));
  box-shadow: 0 1px 10px color-mix(in srgb, var(--vermilion) 50%, transparent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  min-height: var(--header-h);
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(18px) saturate(125%);
}

.site-header__inner {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  max-width: 1540px;
  min-height: var(--header-h);
  margin: 0 auto;
  padding: 8px 28px;
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 38px;
  height: 38px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  place-items: center;
  font-family: var(--display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  background:
    linear-gradient(90deg, transparent 47%, var(--ink) 48%, var(--ink) 52%, transparent 53%),
    linear-gradient(0deg, transparent 47%, var(--ink) 48%, var(--ink) 52%, transparent 53%);
}

.brand__text {
  display: grid;
  line-height: 1.1;
}

.brand__text strong {
  font-family: var(--display);
  font-size: 15px;
  letter-spacing: 0.04em;
}

.brand__text small {
  margin-top: 4px;
  color: var(--ink-soft);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.icon-button,
.status-button {
  display: inline-flex;
  min-height: 38px;
  gap: 8px;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.icon-button:hover,
.status-button:hover {
  border-color: var(--phase);
  background: var(--surface-solid);
  transform: translateY(-1px);
}

.icon-button svg {
  width: 17px;
  height: 17px;
}

.site-layout {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr) 240px;
  gap: 34px;
  width: min(1540px, calc(100% - 48px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.site-layout--index {
  grid-template-columns: 1fr;
  width: min(1300px, calc(100% - 48px));
}

.course-rail,
.page-toc {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  align-self: start;
  max-height: calc(100vh - var(--header-h) - 52px);
  overflow: auto;
  scrollbar-width: thin;
}

.rail-label,
.toc-label,
.eyebrow,
.section-kicker {
  color: var(--vermilion);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.course-rail__phase {
  margin: 0 0 18px;
}

.course-rail__phase h2 {
  margin: 0 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--display);
  font-size: 14px;
  font-weight: 650;
}

.course-rail__phase ol {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.course-rail__phase a {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 6px;
  align-items: baseline;
  padding: 6px 8px;
  border-left: 2px solid transparent;
  border-radius: 0 5px 5px 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.35;
  text-decoration: none;
}

.course-rail__phase a:hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--phase) 8%, transparent);
}

.course-rail__phase a[aria-current="page"] {
  border-left-color: var(--phase);
  color: var(--ink);
  background: var(--phase-soft);
  font-weight: 700;
}

.course-rail__week {
  color: var(--phase);
  font-family: var(--mono);
  font-size: 10px;
}

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

.lesson-hero {
  position: relative;
  isolation: isolate;
  margin-bottom: 26px;
  padding: 42px 46px 0;
  overflow: hidden;
  border: 1px solid var(--rule-strong);
  border-radius: 4px 28px 4px 28px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--surface-solid) 92%, var(--phase-soft)), var(--surface-solid));
  box-shadow: var(--shadow);
}

.lesson-hero::after {
  position: absolute;
  top: -90px;
  right: -60px;
  z-index: -1;
  width: 320px;
  height: 320px;
  border: 1px solid color-mix(in srgb, var(--phase) 32%, transparent);
  border-radius: 48% 52% 60% 40%;
  content: "";
  transform: rotate(22deg);
}

.lesson-hero__meta {
  display: flex;
  gap: 10px;
  align-items: center;
}

.week-stamp {
  display: inline-grid;
  min-width: 72px;
  min-height: 28px;
  place-items: center;
  border: 1px solid var(--phase);
  border-radius: 999px;
  color: var(--phase);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.phase-chip {
  color: var(--ink-soft);
  font-size: 12px;
}

.lesson-hero h1 {
  max-width: 900px;
  margin: 18px 0 14px;
  font-family: var(--display);
  font-size: clamp(34px, 4.4vw, 58px);
  font-weight: 620;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.lesson-hero__summary {
  max-width: 760px;
  margin: 0 0 26px;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.62;
}

.lesson-hero__insight {
  display: grid;
  grid-template-columns: 5px 1fr;
  gap: 14px;
  max-width: 760px;
  margin-bottom: 34px;
  font-family: var(--display);
  font-size: 17px;
}

.lesson-hero__insight::before {
  border-radius: 99px;
  background: var(--vermilion);
  content: "";
}

.lesson-hero figure {
  margin: 0 -46px;
  padding: 20px 26px 0;
  border-top: 1px solid var(--rule);
  background: color-mix(in srgb, var(--phase-soft) 60%, transparent);
}

.lesson-hero figcaption,
.data-figure figcaption {
  padding: 8px 8px 13px;
  color: var(--ink-soft);
  font-size: 11px;
  text-align: center;
}

.supplement-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 20px;
  margin-bottom: 28px;
}

.panel {
  border: 1px solid var(--rule);
  border-radius: 4px 18px 4px 18px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
}

.panel__head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 24px 26px 14px;
  border-bottom: 1px solid var(--rule);
}

.panel__head h2 {
  margin: 3px 0 0;
  font-family: var(--display);
  font-size: 24px;
  line-height: 1.2;
}

.panel__body {
  padding: 24px 26px 28px;
}

.case-question {
  margin: 0 0 20px;
  color: var(--ink-soft);
}

.data-figure {
  margin: 0 0 22px;
  padding: 14px 12px 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: color-mix(in srgb, var(--surface-solid) 82%, var(--phase-soft));
}

.data-table-wrap {
  margin: 0 -2px 22px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

thead {
  color: var(--surface-solid);
  background: var(--navy);
}

th,
td {
  padding: 10px 12px;
  border: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--phase) 5%, transparent);
}

.calculation-box {
  position: relative;
  margin: 18px 0;
  padding: 18px 20px 18px 48px;
  border-left: 3px solid var(--gold);
  background: color-mix(in srgb, var(--gold) 9%, transparent);
}

.calculation-box::before {
  position: absolute;
  top: 16px;
  left: 15px;
  content: "Σ";
  color: var(--gold);
  font-family: var(--display);
  font-size: 22px;
  font-weight: 700;
}

.calculation-box ol {
  margin: 0;
  padding-left: 20px;
}

.calculation-box li + li {
  margin-top: 7px;
}

.result-stack {
  display: grid;
  gap: 10px;
}

.result-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 14px;
  align-items: start;
  padding-top: 10px;
  border-top: 1px dashed var(--rule);
}

.result-row strong {
  color: var(--phase);
  font-size: 12px;
}

.result-row--boundary strong {
  color: var(--vermilion);
}

.literature-list {
  display: grid;
  gap: 14px;
}

.literature-card {
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--rule);
  border-radius: 3px 12px 3px 12px;
  color: var(--ink);
  background: var(--surface-solid);
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.literature-card:hover {
  border-color: var(--phase);
  color: var(--ink);
  box-shadow: var(--shadow-small);
  transform: translateY(-3px);
}

.literature-card__tag {
  width: fit-content;
  padding: 2px 7px;
  border-radius: 999px;
  color: var(--phase);
  background: var(--phase-soft);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.literature-card h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 16px;
  line-height: 1.35;
}

.literature-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.55;
}

.literature-card__focus {
  padding-top: 8px;
  border-top: 1px dashed var(--rule);
}

.source-note {
  margin-top: 16px;
  color: var(--ink-soft);
  font-size: 11px;
}

.lesson-content {
  position: relative;
  padding: 48px clamp(28px, 6vw, 72px) 70px;
  overflow-x: hidden;
  border: 1px solid var(--rule);
  border-radius: 4px 28px 4px 28px;
  background: var(--surface-solid);
  box-shadow: var(--shadow);
}

.lesson-content::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 7px;
  height: 150px;
  background: linear-gradient(var(--phase), transparent);
  content: "";
}

.lesson-content > h1:first-child {
  display: none;
}

.lesson-content h2,
.lesson-content h3,
.lesson-content h4 {
  font-family: var(--display);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.lesson-content h2 {
  position: relative;
  margin: 60px 0 20px;
  padding: 14px 0 12px;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule);
  font-size: 27px;
  font-weight: 620;
  line-height: 1.25;
}

.lesson-content h2:first-of-type {
  margin-top: 0;
}

.lesson-content h2::after {
  position: absolute;
  top: -2px;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--phase);
  content: "";
}

.lesson-content h3 {
  margin: 34px 0 12px;
  color: var(--navy);
  font-size: 21px;
  font-weight: 650;
}

.lesson-content h4 {
  margin: 26px 0 8px;
  font-size: 17px;
}

.lesson-content p {
  margin: 0 0 16px;
}

.lesson-content ul,
.lesson-content ol {
  margin: 12px 0 22px;
  padding-left: 1.45em;
}

.lesson-content li + li {
  margin-top: 6px;
}

.lesson-content li::marker {
  color: var(--phase);
  font-weight: 700;
}

.lesson-content blockquote {
  position: relative;
  margin: 26px 0;
  padding: 20px 24px 20px 54px;
  border: 0;
  border-radius: 3px 14px 3px 14px;
  background: var(--phase-soft);
  font-family: var(--display);
  font-size: 18px;
}

.lesson-content blockquote::before {
  position: absolute;
  top: 8px;
  left: 16px;
  color: var(--phase);
  content: "“";
  font-family: Georgia, serif;
  font-size: 52px;
  line-height: 1;
}

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

code {
  padding: 0.1em 0.35em;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion-soft) 70%, transparent);
  font-family: var(--mono);
  font-size: 0.88em;
}

pre {
  position: relative;
  margin: 22px 0;
  padding: 22px 24px;
  overflow-x: auto;
  border: 1px solid color-mix(in srgb, var(--navy) 65%, transparent);
  border-radius: 3px 14px 3px 14px;
  color: #e8eef2;
  background: #142432;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.06);
}

pre code {
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
  font-size: 12px;
  line-height: 1.7;
}

.lesson-content hr {
  height: 1px;
  margin: 44px 0;
  border: 0;
  background: var(--rule);
}

.lesson-content img {
  margin: 24px auto;
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-small);
}

.lesson-content :not(pre) > code {
  overflow-wrap: anywhere;
  white-space: normal;
}

.lesson-content .data-table-wrap {
  max-width: 100%;
  margin: 20px 0 24px;
}

.lesson-content .task-list-item {
  list-style: none;
}

.lesson-content input[type="checkbox"] {
  margin-left: -1.4em;
  accent-color: var(--phase);
}

.page-toc {
  padding-left: 20px;
  border-left: 1px solid var(--rule);
}

.page-toc nav {
  margin-top: 12px;
}

.page-toc a {
  display: block;
  padding: 5px 0 5px 11px;
  border-left: 2px solid transparent;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.45;
  text-decoration: none;
}

.page-toc a[data-level="3"] {
  padding-left: 24px;
  font-size: 10px;
}

.page-toc a:hover,
.page-toc a.is-active {
  border-left-color: var(--phase);
  color: var(--ink);
}

.page-toc__progress {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 11px;
}

.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 26px;
}

.lesson-nav a {
  display: grid;
  gap: 3px;
  min-height: 88px;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: 3px 14px 3px 14px;
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.lesson-nav a:hover {
  border-color: var(--phase);
  transform: translateY(-2px);
}

.lesson-nav a:last-child {
  text-align: right;
}

.lesson-nav small {
  color: var(--ink-soft);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lesson-nav strong {
  font-family: var(--display);
}

.index-hero {
  position: relative;
  margin: 18px 0 34px;
  padding: clamp(42px, 7vw, 88px);
  overflow: hidden;
  border: 1px solid var(--rule-strong);
  border-radius: 4px 38px 4px 38px;
  color: #f5f2ea;
  background:
    linear-gradient(125deg, rgba(16, 43, 63, 0.98), rgba(21, 64, 81, 0.92)),
    #15304a;
  box-shadow: var(--shadow);
}

.index-hero::before,
.index-hero::after {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  content: "";
}

.index-hero::before {
  top: -150px;
  right: -80px;
  width: 480px;
  height: 480px;
}

.index-hero::after {
  right: 160px;
  bottom: -220px;
  width: 380px;
  height: 380px;
}

.index-hero__serial {
  color: #e5bd72;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.index-hero h1 {
  position: relative;
  z-index: 1;
  max-width: 850px;
  margin: 20px 0 18px;
  font-family: var(--display);
  font-size: clamp(46px, 8vw, 94px);
  font-weight: 580;
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.index-hero p {
  position: relative;
  z-index: 1;
  max-width: 660px;
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 19px;
}

.index-hero__stats {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin-top: 38px;
}

.index-hero__stats span {
  display: grid;
  gap: 2px;
}

.index-hero__stats strong {
  font-family: var(--display);
  font-size: 30px;
}

.index-hero__stats small {
  color: rgba(255, 255, 255, 0.6);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.index-visual {
  margin: 0 0 34px;
  padding: 20px;
  border: 1px solid var(--rule);
  border-radius: 4px 24px 4px 24px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
}

.course-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 24px;
  padding: 16px;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.search-box {
  position: relative;
  flex: 1 1 260px;
  max-width: 520px;
}

.search-box input {
  width: 100%;
  height: 44px;
  padding: 0 16px 0 42px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  outline: none;
  color: var(--ink);
  background: var(--surface-solid);
}

.search-box input:focus {
  border-color: var(--phase);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--phase) 15%, transparent);
}

.search-box::before {
  position: absolute;
  top: 12px;
  left: 16px;
  content: "⌕";
  color: var(--phase);
  font-size: 20px;
  line-height: 1;
}

.phase-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.phase-filter {
  padding: 7px 11px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
}

.phase-filter.is-active,
.phase-filter:hover {
  border-color: var(--phase);
  color: var(--surface-solid);
  background: var(--phase);
}

.week-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.week-card {
  position: relative;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 270px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 3px 20px 3px 20px;
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow-small);
  text-decoration: none;
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.week-card::after {
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 100px;
  height: 100px;
  border: 1px solid var(--card-accent, var(--phase));
  border-radius: 50%;
  opacity: 0.25;
  content: "";
}

.week-card:hover {
  border-color: var(--card-accent, var(--phase));
  color: var(--ink);
  box-shadow: var(--shadow);
  transform: translateY(-7px);
}

.week-card[hidden] {
  display: none;
}

.week-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.week-card__number {
  color: var(--card-accent, var(--phase));
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}

.week-card__phase {
  padding: 3px 8px;
  border-radius: 999px;
  color: var(--ink-soft);
  background: color-mix(in srgb, var(--card-accent, var(--phase)) 10%, transparent);
  font-size: 9px;
}

.week-card h2 {
  margin: 26px 0 12px;
  font-family: var(--display);
  font-size: 25px;
  font-weight: 620;
  line-height: 1.18;
}

.week-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.58;
}

.week-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  color: var(--card-accent, var(--phase));
  font-size: 11px;
}

.empty-state {
  display: none;
  padding: 60px 20px;
  color: var(--ink-soft);
  text-align: center;
}

.empty-state.is-visible {
  display: block;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.resource-card {
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: 3px 18px 3px 18px;
  background: var(--surface);
}

.resource-card h2 {
  margin: 0 0 10px;
  font-family: var(--display);
}

.site-footer {
  max-width: 1540px;
  margin: 0 auto;
  padding: 32px 28px 46px;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 11px;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: center;
  justify-content: space-between;
}

.print-only {
  display: none;
}

@media (max-width: 1240px) {
  .site-layout {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  .page-toc {
    display: none;
  }

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

@media (max-width: 900px) {
  :root {
    --header-h: 58px;
  }

  .site-header__inner {
    padding: 6px 16px;
  }

  .brand__text small,
  .status-button span {
    display: none;
  }

  .site-layout,
  .site-layout--index {
    display: block;
    width: min(100% - 28px, 820px);
    padding-top: 20px;
  }

  .course-rail {
    position: static;
    display: flex;
    gap: 8px;
    margin: 0 0 18px;
    padding: 8px 0 12px;
    overflow-x: auto;
  }

  .course-rail > .rail-label {
    display: none;
  }

  .course-rail__phase {
    display: contents;
  }

  .course-rail__phase h2 {
    display: none;
  }

  .course-rail__phase ol {
    display: flex;
    gap: 5px;
  }

  .course-rail__phase a {
    display: block;
    min-width: 42px;
    padding: 8px 10px;
    border: 1px solid var(--rule);
    border-radius: 999px;
    text-align: center;
  }

  .course-rail__phase a span:last-child {
    display: none;
  }

  .course-rail__phase a[aria-current="page"] {
    border-color: var(--phase);
  }

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

  .lesson-hero {
    padding: 32px 28px 0;
  }

  .lesson-hero figure {
    margin-right: -28px;
    margin-left: -28px;
  }

  .lesson-content {
    padding: 38px 28px 56px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .week-grid,
  .resource-grid,
  .lesson-nav {
    grid-template-columns: 1fr;
  }

  .index-hero {
    padding: 42px 28px;
  }

  .index-hero h1 {
    font-size: 48px;
  }

  .index-hero__stats {
    gap: 14px 24px;
  }

  .course-toolbar {
    align-items: stretch;
  }

  .search-box {
    max-width: none;
  }

  .phase-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 4px;
  }

  .phase-filter {
    flex: 0 0 auto;
  }

  .lesson-hero h1 {
    font-size: 36px;
  }

  .lesson-hero__summary {
    font-size: 16px;
  }

  .panel__head,
  .panel__body {
    padding-right: 20px;
    padding-left: 20px;
  }

  .result-row {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .lesson-content h2 {
    font-size: 23px;
  }

  .lesson-nav a:last-child {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  :root {
    --paper: #fff;
    --surface-solid: #fff;
    --ink: #111;
    --ink-soft: #444;
  }

  body {
    background: #fff;
    font-size: 10.5pt;
  }

  body::before,
  .site-header,
  .course-rail,
  .page-toc,
  .reading-progress,
  .lesson-nav,
  .site-footer {
    display: none !important;
  }

  .site-layout {
    display: block;
    width: 100%;
    margin: 0;
    padding: 0;
  }

  .lesson-hero,
  .panel,
  .lesson-content {
    border: 0;
    box-shadow: none;
  }

  .lesson-hero {
    padding: 20mm 16mm 8mm;
  }

  .lesson-hero figure {
    margin: 0;
  }

  .supplement-grid {
    display: block;
  }

  .panel {
    break-inside: avoid;
    margin-bottom: 8mm;
  }

  .lesson-content {
    padding: 8mm 16mm;
  }

  .lesson-content h2,
  .lesson-content h3,
  table,
  figure {
    break-inside: avoid;
  }

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

  .print-only {
    display: block;
  }
}