:root {
  --color-ink: #18201d;
  --color-paper: #f6f1e7;
  --color-surface: #fffcf7;
  --color-surface-strong: #ffffff;
  --color-primary: #b83a2d;
  --color-primary-dark: #8f291f;
  --color-teal: #1e5a57;
  --color-gold: #94600f;
  --color-purple: #594168;
  --color-muted: #5e6863;
  --color-border: #ded6c9;
  --color-focus: #1268a5;
  --shadow-sm: 0 6px 18px rgba(40, 33, 25, 0.08);
  --shadow-md: 0 18px 48px rgba(40, 33, 25, 0.12);
  --shadow-lg: 0 28px 72px rgba(26, 25, 22, 0.18);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --container: 1180px;
  --header-height: 76px;
  --font-heading: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --font-body: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--color-ink);
  background-color: var(--color-paper);
  background-image:
    radial-gradient(circle at 12% 12%, rgba(184, 58, 45, 0.055) 0 1px, transparent 1.5px),
    radial-gradient(circle at 80% 30%, rgba(30, 90, 87, 0.045) 0 1px, transparent 1.5px);
  background-size: 34px 34px, 46px 46px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

button,
a {
  touch-action: manipulation;
}

button {
  font: inherit;
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 12px 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--color-focus);
  font-weight: 700;
  transform: translateY(-150%);
  transition: transform 180ms ease;
}

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

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-height);
  border-bottom: 1px solid rgba(24, 32, 29, 0.12);
  background: rgba(246, 241, 231, 0.94);
  backdrop-filter: blur(14px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
  filter: drop-shadow(2px 3px 0 rgba(230, 201, 173, 0.9));
}

.brand b,
.brand small {
  display: block;
  line-height: 1.25;
}

.brand b {
  font-family: var(--font-heading);
  font-size: 16px;
  letter-spacing: 0.03em;
}

.brand small {
  margin-top: 2px;
  color: var(--color-muted);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.main-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  color: #37413c;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: color 200ms ease, background-color 200ms ease;
}

.main-nav a:hover {
  color: var(--color-primary-dark);
  background: #fff8ef;
}

.main-nav a.is-active,
.main-nav a[aria-current="true"] {
  color: #fff;
  background: var(--color-primary);
}

.header-progress {
  min-width: 114px;
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.25;
}

.header-progress b {
  color: var(--color-ink);
  font-size: 15px;
}

.mini-progress {
  width: 100%;
  height: 4px;
  display: block;
  overflow: hidden;
  margin-top: 7px;
  border-radius: 999px;
  background: #dcd3c5;
}

.mini-progress span {
  width: 0;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: var(--color-primary);
  transition: width 260ms var(--ease);
}

.hero {
  position: relative;
  min-height: 690px;
  overflow: hidden;
  padding: 88px 0 82px;
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 520px;
  height: 520px;
  top: -240px;
  right: -110px;
  border-radius: 50%;
  border: 1px solid rgba(184, 58, 45, 0.2);
  box-shadow: 0 0 0 62px rgba(184, 58, 45, 0.035), 0 0 0 130px rgba(184, 58, 45, 0.02);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  align-items: center;
  gap: 72px;
}

.overline,
.section-label,
.lesson-kicker,
.exercise-header > div:nth-child(2) > p {
  margin: 0;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.hero h1 {
  max-width: 680px;
  margin: 18px 0 28px;
  font-family: var(--font-heading);
  font-size: clamp(52px, 6.4vw, 88px);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1.11;
}

.hero h1 span {
  position: relative;
  color: var(--color-primary-dark);
}

.hero h1 span::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -6px;
  bottom: 6px;
  left: -7px;
  height: 14px;
  border-radius: 53% 47% 48% 52%;
  background: rgba(195, 138, 44, 0.24);
  transform: rotate(-1.5deg);
}

.hero-lead {
  max-width: 610px;
  margin: 0;
  color: #4e5953;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-top: 34px;
}

.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 0 22px;
  border-radius: 10px;
  font-weight: 800;
  text-decoration: none;
  transition: background-color 200ms ease, box-shadow 200ms ease, transform 200ms ease;
}

.button-primary {
  color: #fff;
  background: var(--color-primary);
  box-shadow: 0 10px 24px rgba(143, 41, 31, 0.22);
}

.button-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 14px 30px rgba(143, 41, 31, 0.28);
  transform: translateY(-2px);
}

.text-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: #3d4742;
  font-weight: 700;
  text-underline-offset: 5px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--color-gold);
}

.text-link:hover {
  color: var(--color-primary-dark);
}

.hero-stats {
  display: flex;
  gap: 0;
  margin: 44px 0 0;
}

.hero-stats > div {
  min-width: 112px;
  padding: 0 22px;
  border-left: 1px solid #cfc6b8;
}

.hero-stats > div:first-child {
  padding-left: 0;
  border-left: 0;
}

.hero-stats dt {
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.15;
}

.hero-stats dd {
  margin: 3px 0 0;
  color: var(--color-muted);
  font-size: 12px;
}

.hero-visual {
  position: relative;
  min-height: 520px;
}

.visual-note {
  position: absolute;
  z-index: 4;
  top: 12px;
  left: 0;
  width: 172px;
  padding: 17px 18px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  background: var(--color-teal);
  box-shadow: var(--shadow-sm);
}

.visual-note span,
.visual-note strong,
.visual-note small {
  display: block;
}

.visual-note span {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.visual-note strong {
  margin: 5px 0 8px;
  font-family: Georgia, serif;
  font-size: 30px;
  line-height: 1;
}

.visual-note small {
  font-size: 11px;
  line-height: 1.5;
}

.visual-card {
  position: absolute;
  overflow: hidden;
  margin: 0;
  border: 10px solid #fff;
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.visual-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.visual-card-main {
  width: 72%;
  height: 70%;
  right: 5%;
  top: 15%;
  transform: rotate(2.2deg);
}

.visual-card-top {
  width: 38%;
  height: 35%;
  top: 4%;
  right: -4%;
  transform: rotate(7deg);
}

.visual-card-bottom {
  width: 43%;
  height: 38%;
  left: 2%;
  bottom: 0;
  transform: rotate(-5deg);
}

.visual-caption {
  position: absolute;
  z-index: 5;
  right: 0;
  bottom: 18px;
  margin: 0;
  padding: 10px 14px;
  color: #fff;
  background: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 13px;
  line-height: 1.55;
  transform: rotate(1.5deg);
}

.intro {
  color: #f7f2e8;
  background: var(--color-ink);
  border-top: 1px solid #050706;
  border-bottom: 1px solid #050706;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(250px, 0.85fr) minmax(260px, 0.9fr) minmax(340px, 1.15fr);
  gap: 50px;
  align-items: center;
  padding-top: 58px;
  padding-bottom: 58px;
}

.intro .section-label {
  color: #e3a44d;
}

.intro h2 {
  margin: 9px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(28px, 3.3vw, 43px);
  line-height: 1.35;
}

.intro-grid > p {
  margin: 0;
  color: #c8cec9;
  font-size: 15px;
}

.path-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: #3a433e;
  border: 1px solid #3a433e;
}

.path-list li {
  min-height: 112px;
  padding: 17px 14px;
  background: #222b27;
}

.path-list span,
.path-list b,
.path-list small {
  display: block;
}

.path-list span {
  color: #e3a44d;
  font-family: Georgia, serif;
  font-size: 12px;
}

.path-list b {
  margin-top: 10px;
  font-size: 15px;
}

.path-list small {
  margin-top: 3px;
  color: #9fab9f;
  font-size: 10px;
}

.lessons {
  padding: 94px 0 110px;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.section-heading h2 {
  margin: 6px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(36px, 4.5vw, 56px);
  line-height: 1.2;
}

.progress-panel {
  width: min(310px, 100%);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 7px 18px;
}

.progress-panel > span {
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 700;
}

.progress-panel strong {
  font-family: Georgia, serif;
  font-size: 20px;
}

.progress-track {
  grid-column: 1 / -1;
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #ded5c8;
}

.progress-track span {
  width: 0;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: var(--color-primary);
  transition: width 260ms var(--ease);
}

.exercise-block {
  padding-top: 88px;
}

.exercise-header {
  display: grid;
  grid-template-columns: 82px minmax(280px, 1fr) minmax(280px, 0.8fr);
  gap: 22px;
  align-items: end;
  margin-bottom: 28px;
}

.exercise-number {
  color: var(--color-primary);
  font-family: Georgia, serif;
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
}

.exercise-header h2 {
  margin: 4px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(27px, 3.5vw, 42px);
  line-height: 1.25;
}

.exercise-summary {
  margin: 0 0 3px;
  color: var(--color-muted);
  font-size: 15px;
}

.lesson-grid {
  display: grid;
  gap: 22px;
}

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

.lesson-card {
  --card-accent: var(--color-primary);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-top: 5px solid var(--card-accent);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: border-color 220ms ease, box-shadow 220ms ease, transform 220ms var(--ease);
}

.lesson-card:hover,
.lesson-card:focus-within {
  border-color: color-mix(in srgb, var(--card-accent) 48%, var(--color-border));
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.lesson-card-red { --card-accent: var(--color-primary); }
.lesson-card-gold { --card-accent: var(--color-gold); }
.lesson-card-teal { --card-accent: var(--color-teal); }
.lesson-card-ink { --card-accent: #2f302f; }
.lesson-card-purple { --card-accent: var(--color-purple); }

.lesson-main {
  display: block;
  color: inherit;
  text-decoration: none;
}

.lesson-image {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: #ece4d8;
}

.lesson-image::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 -60px 70px rgba(17, 20, 18, 0.08);
  pointer-events: none;
}

.lesson-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 360ms var(--ease), filter 260ms ease;
}

.lesson-card:hover .lesson-image img,
.lesson-card:focus-within .lesson-image img {
  transform: scale(1.025);
  filter: saturate(1.04);
}

.level-badge {
  position: absolute;
  z-index: 2;
  top: 14px;
  left: 14px;
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 999px;
  color: #fff;
  background: var(--card-accent);
  font-size: 12px;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.lesson-content {
  padding: 28px 28px 22px;
}

.lesson-kicker {
  color: var(--card-accent);
}

.lesson-content h3 {
  margin: 8px 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(25px, 2.5vw, 34px);
  line-height: 1.35;
}

.lesson-content > p:not(.lesson-kicker) {
  margin: 0;
  color: var(--color-muted);
  font-size: 15px;
}

.lesson-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.lesson-tags li {
  padding: 5px 9px;
  border: 1px solid #d9d0c2;
  border-radius: 999px;
  color: #59635e;
  background: #fbf7f0;
  font-size: 11px;
  font-weight: 700;
}

.open-label {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  color: var(--card-accent);
  font-size: 14px;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 5px;
  text-decoration-thickness: 2px;
}

.complete-button {
  width: calc(100% - 56px);
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 28px 25px;
  border: 1px solid #d2c9bc;
  border-radius: 10px;
  color: #46504b;
  background: transparent;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease;
}

.complete-button:hover {
  border-color: var(--card-accent);
  color: var(--card-accent);
  background: #fffaf3;
}

.check-mark {
  width: 20px;
  height: 20px;
  display: inline-block;
  border: 2px solid currentColor;
  border-radius: 50%;
}

.complete-button[aria-pressed="true"] {
  border-color: var(--color-teal);
  color: #fff;
  background: var(--color-teal);
}

.complete-button[aria-pressed="true"] .check-mark {
  position: relative;
  border-color: #fff;
}

.complete-button[aria-pressed="true"] .check-mark::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 4px;
  top: 5px;
  left: 4px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
}

.lesson-card.is-complete {
  box-shadow: inset 0 0 0 2px rgba(30, 90, 87, 0.18), var(--shadow-sm);
}

.lesson-card-feature {
  overflow: hidden;
}

.feature-main {
  display: grid;
  grid-template-columns: minmax(380px, 1fr) minmax(360px, 0.95fr);
}

.feature-main .lesson-image {
  height: 100%;
  min-height: 480px;
  aspect-ratio: auto;
}

.feature-main .lesson-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 48px;
}

.feature-main .lesson-content h3 {
  font-size: clamp(30px, 4vw, 47px);
}

.feature-points {
  display: grid;
  gap: 0;
  margin: 25px 0 2px;
  border-top: 1px solid #ded6c9;
}

.feature-points span {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  border-bottom: 1px solid #ded6c9;
  color: #57605c;
  font-size: 13px;
}

.feature-points b {
  color: var(--color-purple);
}

.lesson-card-feature .complete-button {
  width: auto;
  margin-left: calc(50% + 48px);
  margin-right: 48px;
}

.review-tips {
  position: relative;
  overflow: hidden;
  padding: 84px 0 96px;
  color: #f7f2e8;
  background: var(--color-teal);
}

.review-tips::before {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -180px;
  bottom: -250px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 0 0 54px rgba(255, 255, 255, 0.025), 0 0 0 108px rgba(255, 255, 255, 0.02);
}

.tips-heading {
  border-color: rgba(255, 255, 255, 0.25);
}

.review-tips .section-label {
  color: #f2c26d;
}

.tips-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 36px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.25);
}

.tips-grid article {
  min-height: 245px;
  padding: 30px;
  background: var(--color-teal);
}

.tip-number {
  display: block;
  color: #f2c26d;
  font-family: Georgia, serif;
  font-size: 30px;
  font-weight: 700;
}

.tips-grid h3 {
  margin: 18px 0 10px;
  font-family: var(--font-heading);
  font-size: 22px;
}

.tips-grid p {
  margin: 0;
  color: #d6e2df;
  font-size: 14px;
}

.site-footer {
  padding: 54px 0 30px;
  color: #dfe4e1;
  background: #111714;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: flex-start;
}

.footer-inner b {
  font-family: var(--font-heading);
  font-size: 20px;
}

.footer-inner p {
  margin: 6px 0 0;
  color: #9da9a3;
  font-size: 13px;
}

.footer-inner a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #f2c26d;
  font-weight: 700;
  text-underline-offset: 5px;
}

.footer-note {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid #303934;
  color: #87928c;
  font-size: 12px;
}

.toast {
  position: fixed;
  z-index: 100;
  right: 22px;
  bottom: 22px;
  max-width: min(360px, calc(100% - 44px));
  padding: 12px 16px;
  border-radius: 10px;
  color: #fff;
  background: #18201d;
  box-shadow: var(--shadow-md);
  font-size: 14px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms var(--ease);
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  .hero {
    min-height: auto;
  }

  .hero-grid {
    grid-template-columns: 1fr 0.86fr;
    gap: 40px;
  }

  .hero-visual {
    min-height: 470px;
  }

  .visual-card-main {
    width: 80%;
  }

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

  .path-list {
    grid-column: 1 / -1;
  }

  .exercise-header {
    grid-template-columns: 70px 1fr;
  }

  .exercise-summary {
    grid-column: 2;
  }

  .lesson-content {
    padding: 24px 24px 20px;
  }

  .complete-button {
    width: calc(100% - 48px);
    margin: 0 24px 22px;
  }

  .feature-main .lesson-content {
    padding: 36px;
  }

  .lesson-card-feature .complete-button {
    margin-left: calc(50% + 36px);
    margin-right: 36px;
  }
}

@media (max-width: 820px) {
  :root {
    --header-height: 68px;
  }

  .container {
    width: min(var(--container), calc(100% - 32px));
  }

  .header-inner {
    gap: 18px;
  }

  .main-nav {
    display: none;
  }

  .header-progress {
    margin-left: auto;
  }

  .hero {
    padding: 66px 0 58px;
  }

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

  .hero h1 {
    max-width: 720px;
  }

  .hero-visual {
    width: min(600px, 100%);
    min-height: 480px;
    margin: 6px auto 0;
  }

  .visual-card-main {
    width: 70%;
  }

  .intro-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .path-list {
    grid-column: auto;
  }

  .lessons {
    padding: 72px 0 82px;
  }

  .two-columns,
  .tips-grid {
    grid-template-columns: 1fr;
  }

  .feature-main {
    grid-template-columns: 1fr;
  }

  .feature-main .lesson-image {
    min-height: 0;
    aspect-ratio: 3 / 2;
  }

  .lesson-card-feature .complete-button {
    width: calc(100% - 72px);
    margin: 0 36px 30px;
  }

  .tips-grid article {
    min-height: 0;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(var(--container), calc(100% - 24px));
  }

  .brand-mark {
    width: 46px;
    height: 46px;
  }

  .brand b {
    font-size: 13px;
  }

  .brand small {
    font-size: 9px;
  }

  .header-progress {
    min-width: 88px;
  }

  .hero {
    padding-top: 48px;
  }

  .hero h1 {
    font-size: clamp(43px, 14vw, 61px);
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button,
  .text-link {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-stats > div {
    min-width: 0;
    padding: 0 12px;
  }

  .hero-stats dt {
    font-size: 23px;
  }

  .hero-visual {
    min-height: 370px;
  }

  .visual-note {
    width: 144px;
    padding: 13px;
  }

  .visual-card {
    border-width: 6px;
  }

  .visual-card-main {
    width: 76%;
    height: 66%;
  }

  .visual-card-top {
    width: 41%;
    height: 32%;
  }

  .visual-card-bottom {
    width: 46%;
    height: 34%;
  }

  .visual-caption {
    right: 3px;
    bottom: 0;
    font-size: 11px;
  }

  .path-list {
    grid-template-columns: 1fr;
  }

  .path-list li {
    min-height: 84px;
  }

  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .progress-panel {
    width: 100%;
  }

  .exercise-block {
    padding-top: 66px;
  }

  .exercise-header {
    grid-template-columns: 52px 1fr;
    gap: 12px;
  }

  .exercise-number {
    font-size: 35px;
  }

  .exercise-summary {
    grid-column: 1 / -1;
    padding-left: 64px;
  }

  .lesson-content,
  .feature-main .lesson-content {
    padding: 23px 20px 18px;
  }

  .lesson-content h3 {
    font-size: 27px;
  }

  .complete-button,
  .lesson-card-feature .complete-button {
    width: calc(100% - 40px);
    margin: 0 20px 20px;
  }

  .feature-points span {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 0;
    min-height: 58px;
  }

  .review-tips {
    padding: 66px 0 72px;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .header-progress {
    display: none;
  }

  .brand {
    max-width: 100%;
  }

  .brand b {
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  .site-header,
  .hero-actions,
  .complete-button,
  .toast,
  .site-footer {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .hero,
  .lessons,
  .review-tips {
    padding: 32px 0;
  }

  .lesson-card,
  .tips-grid article {
    break-inside: avoid;
    box-shadow: none;
  }
}