.video-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 28px;
  align-items: start;
  max-width: 1400px;
  margin: 0 auto;
}
.video-layout > learning-support {
  grid-column: 2;
  grid-row: 1;
  position: sticky;
  top: 24px;
  min-width: 0;
}
.video-layout > .video-main,
.video-layout > .episodes-section {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  min-width: 0;
}
learning-support {
  display: block;
  font-family: inherit;
}
.learning-support {
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  background: var(--panel-bg);
  overflow: hidden;
}
.support-books {
  padding: 18px 16px 14px;
}
.learning-support h2 {
  font-size: 16px;
  line-height: 1.5;
  font-weight: 700;
}
.support-book-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}
.support-book-list figure {
  margin: 0;
  min-width: 0;
}
.support-book-list img {
  width: 100%;
  height: auto;
  aspect-ratio: 164/272;
  object-fit: contain;
  display: block;
  border-radius: 4px;
}
.support-book-list figcaption {
  text-align: center;
  font-size: 12px;
  line-height: 1.6;
  margin-top: 6px;
  color: var(--muted);
}
.support-connect { padding: 14px 16px 16px; border-top: 1px solid var(--line); container-type: inline-size; }
.support-connect-title { font-size: 17px; line-height: 1.5; }
.support-connect-intro { margin-top: 4px; font-size: 11px; line-height: 1.8; color: var(--muted); }
.support-service-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr) auto; gap: 14px 8px; align-items: center; margin-top: 14px; }
.support-service { display: flex; gap: 7px; align-items: flex-start; min-width: 0; }
.service-icon { display: none; place-items: center; flex: 0 0 24px; height: 24px; border-radius: 6px; background: #1c3348; color: var(--accent); }
.support-service strong { display: block; font-size: 12px; font-weight: 500; line-height: 1.6; }
.support-service small { display: block; color: var(--muted); font-size: 10px; line-height: 1.8; }
.support-contact { grid-column: 3; grid-row: 1 / span 2; display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center; }
.support-qr-button {
  flex-shrink: 0;
  padding: 0;
  border: 0;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  cursor: zoom-in;
}
.support-qr-button img {
  display: block;
  width: 112px; /* Fallback for browsers without container query units. */
  width: clamp(112px, 30cqw, 132px);
  height: auto;
  aspect-ratio: 1;
}
.support-contact small { font-size: 10px; line-height: 1.8; color: var(--accent); }
.support-ai {
  padding: 18px 16px;
  border-top: 1px solid var(--line);
  background: #102335;
}
.support-ai-heading { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.support-ai-logo { display: block; width: 32px; height: 32px; flex-shrink: 0; border-radius: 50%; object-fit: contain; }
.support-ai h3 { font-size: 15px; font-weight: 700; line-height: 1.5; }
.support-ai-lead { margin: 12px 0 6px; font-size: 19px; font-weight: 700; line-height: 1.5; letter-spacing: -.3px; }
.support-ai-intro { font-size: 12px; line-height: 1.85; color: var(--muted); }
.support-dialog {
  margin: auto;
  width: min(390px, calc(100vw - 24px));
  max-width: none;
  padding: 28px 20px 22px;
  border: 0;
  border-radius: 14px;
  background: #fff;
  color: #192737;
  text-align: center;
}
.support-dialog::backdrop {
  background: #030912d9;
}
.support-dialog h2 {
  font-size: 20px;
  margin: 8px 0;
}
.support-dialog img {
  display: block;
  width: 100%;
  height: auto;
}
.support-dialog p {
  font-size: 14px;
  line-height: 1.6;
}
.support-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: #edf1f5;
  color: #192737;
  font-size: 18px;
  cursor: pointer;
}
/* QR images must retain the phone's native long-press menu. */
.support-qr-button img,
.support-dialog img {
  -webkit-touch-callout: default;
  -webkit-user-select: auto;
  user-select: auto;
  -webkit-user-drag: auto;
}
@media (max-width: 980px) {
  .video-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .video-layout > learning-support {
    grid-column: 1;
    grid-row: 1;
    position: static;
  }
  .video-layout > .video-main,
  .video-layout > .episodes-section {
    grid-column: 1;
    grid-row: 2;
  }
  .learning-support {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  .support-books {
    grid-column: 1;
    grid-row: 1;
  }
  .support-connect {
    grid-column: 2;
    padding-top: 18px;
  }
  .support-ai {
    grid-column: 1 / -1;
  }
  .support-book-list {
    max-width: 320px;
  }
}
@media (max-width: 620px) {
  .learning-support {
    display: block;
  }
  .support-books {
    padding: 14px 16px 10px;
  }
  .support-book-list {
    max-width: 280px;
    gap: 16px;
    margin: 10px auto 0;
  }
  .support-book-list img {
    max-height: 110px;
  }
  .support-connect { padding: 14px 16px 16px; }
  .support-ai {
    padding: 12px 16px;
  }
}

.service-icon svg { width: 16px; height: 16px; }
@container (min-width:360px) { .service-icon { display: grid; } .support-service small { font-size: 11px; } }


.learning-support .support-ai-link { display: block; color: inherit; text-decoration: none; }
.support-ai-link h3 { color: var(--accent); text-decoration: underline; text-decoration-color: #45677f; text-underline-offset: 4px; }
.support-ai-link:hover h3 { text-decoration-color: currentColor; }
.support-ai-link:focus-visible { outline: 2px solid var(--accent); outline-offset: -4px; border-radius: 3px; }