:root {
  --lesson-bg: #e8e7e2;
  --lesson-paper: #fffaf0;
  --lesson-ink: #243b40;
  --lesson-muted: #5e6f70;
  --lesson-accent: #8b4a35;
  --lesson-accent-soft: #f1d9c6;
  --lesson-gold: #d79a2b;
  --lesson-deep: #234b4d;
  --lesson-line: rgba(36, 59, 64, .2);
  --lesson-shadow: 0 24px 70px rgba(45, 54, 53, .14);
}

body[data-visual-system="old-house-prediction"] {
  background:
    radial-gradient(circle at 90% 5%, rgba(211, 167, 95, .16), transparent 24rem),
    linear-gradient(180deg, #e9edf0 0, var(--lesson-bg) 36rem);
}

body[data-visual-system="old-house-prediction"] .lesson-hero {
  border-color: rgba(36, 75, 77, .22);
  background: #fffaf0;
}

.old-house-hero h1 {
  max-width: 8em;
  color: var(--lesson-deep);
  letter-spacing: .02em;
}

.old-house-author {
  margin: 0 0 16px;
  color: var(--lesson-accent);
  font-family: var(--lesson-serif);
  font-size: 19px;
  font-weight: 800;
}

.old-house-hero .hero-lead {
  max-width: 30em;
}

.old-house-hero .learning-path li:nth-child(2) {
  color: #fffaf0;
  background: var(--lesson-deep);
}

.old-house-hero .learning-path li:nth-child(3) {
  color: #fffaf0;
  background: var(--lesson-accent);
}

.old-house-hero .hero-visual {
  min-height: 500px;
  background: #b9c6ca;
}

.old-house-hero .hero-visual::before {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(30, 50, 56, .02), rgba(30, 50, 56, .48));
}

.old-house-hero .hero-visual img {
  object-position: 50% 48%;
}

.old-house-hero .hero-visual figcaption {
  z-index: 2;
  right: 20px;
  bottom: 20px;
  max-width: calc(100% - 40px);
  color: #fffdf5;
  background: rgba(35, 75, 77, .9);
  border-radius: 4px 16px 4px 16px;
  letter-spacing: .03em;
}

.old-house-original-card {
  background:
    linear-gradient(90deg, transparent 0 2.7rem, rgba(139, 74, 53, .12) 2.7rem 2.78rem, transparent 2.78rem),
    repeating-linear-gradient(0deg, transparent 0 3.2rem, rgba(36, 59, 64, .075) 3.2rem 3.24rem),
    #fffdf7;
}

.old-house-original-card [data-testid="textbook-original"] {
  display: grid;
  gap: 20px;
  color: var(--lesson-ink);
}

.old-house-original-card [data-testid="textbook-original"] > p {
  margin: 0;
  padding-left: 16px;
  border-left: 3px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

.old-house-original-card [data-testid="textbook-original"] > p[data-paragraph-id="P02"] {
  border-left-color: rgba(215, 154, 43, .58);
}

.old-house-original-card [data-testid="textbook-original"] > p[data-paragraph-id="P03"] {
  border-left-color: rgba(139, 74, 53, .5);
}

.old-house-original-card [data-testid="textbook-original"] > p[data-paragraph-id="P04"] {
  border-left-color: rgba(35, 75, 77, .58);
}

body[data-mode="listen"] .old-house-original-card [data-testid="textbook-original"] > p {
  color: var(--lesson-muted);
}

body[data-mode="listen"] .old-house-original-card [data-testid="textbook-original"] > p[data-paragraph-id="P01"] {
  color: var(--lesson-deep);
}

.old-house-pause-guide {
  color: var(--lesson-deep);
  background: #e7eef0;
  border-left-color: var(--lesson-accent);
}

.old-house-pause-guide b {
  color: var(--lesson-accent);
}

.segment-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 28px;
}

.segment-button {
  min-height: 54px;
  padding: 9px 12px;
  color: var(--lesson-deep);
  background: #f1e5d4;
  border: 1px solid rgba(36, 59, 64, .18);
  border-radius: 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
  line-height: 1.35;
}

.segment-button:hover,
.segment-button[aria-pressed="true"] {
  color: #fffaf0;
  background: var(--lesson-accent);
  border-color: var(--lesson-accent);
}

.segment-button:disabled {
  opacity: .52;
  cursor: not-allowed;
}

.old-house-pronunciations {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.old-house-pronunciations .sound-card {
  background: #edf1ef;
}

.old-house-pronunciations .sound-card strong {
  color: var(--lesson-deep);
}

.old-house-pronunciations .sound-card em {
  color: var(--lesson-accent);
}

.prediction-section {
  background:
    linear-gradient(135deg, rgba(231, 238, 240, .9), rgba(255, 250, 240, .94) 52%),
    var(--lesson-paper);
}

.prediction-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.prediction-card {
  min-width: 0;
  min-height: 196px;
  padding: 18px;
  background: rgba(255, 253, 247, .92);
  border: 1px solid var(--lesson-line);
  border-top: 4px solid var(--lesson-accent);
  border-radius: 14px 14px 4px 4px;
}

.prediction-card:nth-child(2) { border-top-color: var(--lesson-gold); }
.prediction-card:nth-child(3) { border-top-color: #a85b42; }
.prediction-card:nth-child(4) { border-top-color: var(--lesson-deep); }

.prediction-card b {
  display: block;
  color: var(--lesson-accent);
  font-family: var(--lesson-serif);
  font-size: 30px;
  line-height: 1;
}

.prediction-card h3 {
  margin: 12px 0 7px;
  color: var(--lesson-deep);
  font-size: 20px;
}

.prediction-card p {
  margin: 0;
  color: var(--lesson-muted);
  font-size: 14px;
  line-height: 1.75;
}

.prediction-note {
  margin: 20px 0 0;
  padding: 17px 18px;
  color: var(--lesson-deep);
  background: #f1dfcb;
  border-radius: 0 14px 0 14px;
  font-size: 15px;
}

.prediction-note strong {
  color: var(--lesson-accent);
}

.visual-section .section-heading p:last-child {
  max-width: 50em;
}

.old-house-story-strip .story-step {
  background: #fffdf7;
  border-radius: 14px 14px 4px 4px;
}

.old-house-story-strip .story-step:nth-child(1) { border-top: 4px solid var(--lesson-accent); }
.old-house-story-strip .story-step:nth-child(2) { border-top: 4px solid var(--lesson-gold); }
.old-house-story-strip .story-step:nth-child(3) { border-top: 4px solid #a85b42; }
.old-house-story-strip .story-step:nth-child(4) { border-top: 4px solid var(--lesson-deep); }

.old-house-story-strip .story-step img {
  aspect-ratio: 9 / 14;
}

.old-house-story-strip .story-step figcaption {
  min-height: 92px;
  color: var(--lesson-muted);
  background: #fffdf7;
}

.old-house-story-strip .story-step b {
  color: var(--lesson-deep);
}

.task-section {
  background: #f4eee3;
}

.task-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: task;
}

.task-list li {
  position: relative;
  min-height: 68px;
  padding: 17px 20px 17px 66px;
  color: var(--lesson-deep);
  background: #fffdf7;
  border: 1px solid var(--lesson-line);
  border-radius: 12px;
  font-family: var(--lesson-serif);
  font-size: 18px;
  line-height: 1.8;
}

.task-list li::before {
  counter-increment: task;
  content: counter(task);
  position: absolute;
  left: 18px;
  top: 17px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: #fffaf0;
  background: var(--lesson-accent);
  border-radius: 50%;
  font-family: var(--lesson-sans);
  font-size: 13px;
  font-weight: 900;
}

.old-house-recitation .recite-prompt {
  background: rgba(255, 255, 255, .1);
}

.old-house-recitation .recite-hint {
  color: #fffdf5;
}

.old-house-video video {
  max-height: 560px;
}

.old-house-disclosure {
  color: var(--lesson-muted);
}

@media (max-width: 900px) {
  .segment-grid,
  .prediction-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .old-house-pronunciations {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .old-house-hero .hero-visual {
    min-height: 300px;
    max-height: 360px;
  }

  .old-house-original-card [data-testid="textbook-original"] {
    gap: 18px;
    font-size: 23px;
    line-height: 2;
  }

  .old-house-original-card [data-testid="textbook-original"] > p {
    padding-left: 10px;
  }

  .segment-grid,
  .prediction-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .task-list li {
    padding-left: 58px;
    font-size: 16px;
  }
}

@media (max-width: 420px) {
  .prediction-card {
    min-height: 0;
    padding: 14px;
  }

  .prediction-card h3 {
    font-size: 18px;
  }

  .prediction-card p {
    font-size: 13px;
  }
}