.page-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}
.page-heading h1 {
  margin: 0 0 8px;
  font-size: 29px;
  line-height: 1.15;
}
.page-heading p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}
.page-search {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 44px;
  align-items: center;
  min-height: 48px;
  margin-bottom: 18px;
  padding: 0 8px 0 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
  color: #7f8aad;
}
.page-search input {
  min-width: 0;
  border: 0;
  outline: 0;
  color: var(--ink);
  font: inherit;
}
.page-search button {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 10px;
  background: var(--primary);
  color: #ffffff;
}
.side-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}
.side-card h3,
.side-card p {
  margin: 0;
}
.side-card label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: #4f5d82;
  font-size: 13px;
  line-height: 1.45;
}
.side-title {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}
.side-title span,
.side-title button {
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}
.lesson-screen {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 24px;
  align-items: start;
}
.lesson-main {
  min-width: 0;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 18px;
  color: #8a94b4;
  font-size: 13px;
}
.breadcrumb button {
  border: 0;
  background: transparent;
  color: var(--primary);
  font-weight: 700;
}
.lesson-hero-head {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  margin-bottom: 26px;
}
.lesson-level-badge {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: #f0edff;
  color: var(--primary);
  font-weight: 950;
}
.lesson-hero-head h1 {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.15;
}
.lesson-hero-head p {
  margin: 0 0 14px;
  color: var(--muted);
}
.lesson-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  color: #697694;
  font-size: 13px;
  font-weight: 700;
}
.complete-button {
  min-width: 158px;
  border-radius: 10px;
}
.video-card {
  position: relative;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) minmax(210px, 0.8fr);
  align-items: center;
  min-height: 302px;
  overflow: hidden;
  padding: 42px 32px 58px;
  border-radius: 16px;
  background:
    radial-gradient(circle at 78% 32%, rgba(85, 190, 255, 0.4), transparent 210px),
    radial-gradient(circle at 48% 42%, rgba(116, 100, 255, 0.42), transparent 220px),
    linear-gradient(135deg, #101d66 0%, #2930a8 52%, #6555ff 100%);
  color: #ffffff;
  box-shadow: var(--shadow);
}
.video-play {
  display: grid;
  place-items: center;
  width: 78px;
  height: 78px;
  border: 4px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
  background: #ffffff;
  color: #101936;
  font-size: 28px;
  box-shadow: 0 18px 42px rgba(2, 12, 43, 0.28);
}
.video-copy h2 {
  max-width: 360px;
  margin: 0 0 10px;
  font-size: 32px;
  line-height: 1.05;
}
.video-copy p {
  margin: 0;
  color: #dbe4ff;
  font-weight: 800;
}
.video-robot {
  position: relative;
  display: grid;
  place-items: center;
  justify-self: center;
  width: 210px;
  height: 174px;
  border-radius: 42% 42% 46% 46%;
  background: radial-gradient(circle at 50% 30%, #1e3265 0 28%, #d9e7ff 29% 58%, #ffffff 59%);
  color: #68e7ff;
  font-size: 48px;
}
.video-robot i {
  position: absolute;
  left: -18px;
  top: 38px;
  color: #ffc94c;
  font-style: normal;
  font-size: 36px;
}
.video-controls {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 16px;
  display: grid;
  grid-template-columns: 26px 26px auto 1fr 26px 26px 26px;
  gap: 12px;
  align-items: center;
  color: #ffffff;
  font-size: 13px;
}
.video-controls::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -12px;
  height: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
}
.lesson-tabs {
  display: flex;
  gap: 44px;
  margin: 28px 0 20px;
  border-bottom: 1px solid var(--line);
}
.lesson-tabs button {
  min-height: 42px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: #64708f;
  font-weight: 800;
}
.lesson-tabs .active {
  border-color: var(--primary);
  color: var(--primary);
}
.lesson-article {
  display: grid;
  gap: 14px;
  color: #4d5c81;
  line-height: 1.65;
}
.lesson-article h3,
.lesson-article p,
.lesson-article ul {
  margin: 0;
}
.lesson-article ul {
  display: grid;
  gap: 8px;
  padding: 0;
  list-style: none;
}
.note-box {
  display: grid;
  gap: 6px;
  padding: 14px 18px;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  background: #f4f3ff;
  color: #596487;
}
.lesson-side {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 16px;
}
.lesson-outline {
  display: grid;
  gap: 8px;
}
.outline-item,
.resource-item,
.popular-check,
.prompt-category {
  width: 100%;
  border: 1px solid var(--line);
  background: #ffffff;
  text-align: left;
}
.outline-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 42px 20px;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border-radius: 14px;
  color: #536083;
}
.outline-item.active {
  border-color: #d9d4ff;
  background: #f0edff;
  color: var(--primary);
}
.outline-item span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #eef1ff;
  font-weight: 900;
}
.outline-item strong,
.resource-item strong,
.popular-check strong {
  color: var(--ink);
  font-size: 13px;
}
.outline-item small,
.resource-item small,
.popular-check small {
  color: var(--muted);
  font-size: 12px;
}
.resource-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 26px;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border: 0;
  border-radius: 12px;
}
.resource-item span,
.popular-check span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #eef6ff;
  color: #2982e8;
}
.lesson-footer {
  grid-column: 1 / -1;
  position: sticky;
  bottom: 0;
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) 160px;
  gap: 16px;
  align-items: center;
  padding: 14px 0 0;
  background: rgba(247, 248, 255, 0.86);
  backdrop-filter: blur(16px);
}
.lesson-footer .ghost-button:nth-child(2) {
  justify-self: center;
  min-width: 160px;
}
.prompt-page {
  display: grid;
  gap: 18px;
}
.prompt-suggest {
  min-width: 176px;
}
.prompt-tabs {
  margin-bottom: 4px;
}
.prompt-stats,
.featured-prompts,
.prompt-category-grid {
  display: grid;
  gap: 16px;
}
.prompt-stats {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.prompt-stat,
.featured-prompt {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}
.prompt-stat {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 18px;
}
.prompt-stat strong,
.prompt-stat span,
.prompt-stat small {
  display: block;
}
.prompt-stat strong {
  color: var(--ink);
  font-size: 22px;
}
.prompt-stat span {
  font-weight: 800;
}
.prompt-stat small {
  color: var(--muted);
}
.featured-prompts {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.featured-prompt {
  display: grid;
  gap: 14px;
  min-height: 190px;
  padding: 18px;
}
.featured-prompt.green { background: linear-gradient(135deg, #ffffff, #effcf6); }
.featured-prompt.orange { background: linear-gradient(135deg, #ffffff, #fff1e8); }
.featured-prompt.blue { background: linear-gradient(135deg, #ffffff, #eef7ff); }
.featured-prompt.violet { background: linear-gradient(135deg, #ffffff, #f2efff); }
.featured-top,
.prompt-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.featured-prompt h3,
.featured-prompt p,
.featured-prompt small {
  margin: 0;
}
.featured-prompt p,
.featured-prompt small,
.prompt-card-foot span {
  color: var(--muted);
  font-size: 13px;
}
.prompt-card-foot .ghost-button {
  min-height: 34px;
  padding: 0 12px;
}
.prompt-category-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}
.prompt-category {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: center;
  min-height: 68px;
  padding: 12px;
  border-radius: 12px;
}
.prompt-category .prompt-icon {
  grid-row: span 2;
}
.prompt-category small {
  color: var(--muted);
}
.prompt-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}
.prompt-table table {
  min-width: 920px;
}
.prompt-table .ghost-button {
  min-height: 34px;
  padding: 0 12px;
}
.check-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 318px;
  gap: 24px;
  align-items: start;
}
.check-main h2 {
  margin: 18px 0 14px;
  font-size: 20px;
}
.check-list,
.check-side {
  display: grid;
  gap: 14px;
}
.check-side {
  position: sticky;
  top: 96px;
}
.check-row {
  display: grid;
  grid-template-columns: 58px 58px minmax(0, 1fr) 180px 110px;
  gap: 18px;
  align-items: center;
  min-height: 92px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}
.check-code,
.check-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #f0edff;
  color: var(--primary);
  font-weight: 950;
}
.check-icon {
  font-size: 26px;
}
.check-row.green .check-code,
.check-row.green .check-icon { background: #e9fbf3; color: var(--green); }
.check-row.amber .check-code,
.check-row.amber .check-icon { background: #fff4e3; color: var(--orange); }
.check-row.blue .check-code,
.check-row.blue .check-icon { background: #eef6ff; color: #3b7cff; }
.check-row.teal .check-code,
.check-row.teal .check-icon { background: #e8fbfd; color: #12a2af; }
.check-row h3,
.check-row p {
  margin: 0 0 6px;
}
.check-row p,
.check-row small {
  color: var(--muted);
}
.check-progress {
  display: grid;
  gap: 8px;
}
.check-progress strong {
  color: var(--primary);
  font-size: 20px;
}
.progress-summary .progress-ring {
  width: 132px;
  height: 132px;
  margin: 0 auto;
}
.progress-summary .progress-ring > div {
  width: 94px;
  height: 94px;
}
.progress-summary dl {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin: 0;
  color: #536083;
  font-size: 13px;
}
.progress-summary dd {
  margin: 0;
  color: var(--ink);
  font-weight: 900;
}
.filter-field {
  display: grid;
  gap: 7px;
  color: #536083;
  font-size: 13px;
  font-weight: 800;
}
.filter-field select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfcff;
  color: #6b7593;
}
.popular-check {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 2px 10px;
  align-items: center;
  border: 0;
  border-radius: 12px;
}
.popular-check span {
  grid-row: span 2;
}
.real-video-card .video-controls i{position:relative;height:5px;border-radius:99px;background:rgba(255,255,255,.28);overflow:hidden}
.real-video-card .video-controls i b{display:block;height:100%;border-radius:inherit;background:#fff;transition:width .25s ease}
.lesson-panel{display:grid;gap:16px}.lesson-panel[hidden]{display:none}
.practice-box,.quiz-box,.notes-panel,.resource-grid-real .resource-item{border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow-soft)}
.practice-box,.quiz-box,.notes-panel{display:grid;gap:12px;padding:18px}
.practice-box textarea,.notes-panel textarea{width:100%;min-height:150px;padding:12px;border:1px solid var(--line);border-radius:12px;background:#fbfcff;color:var(--ink);resize:vertical}
.quiz-box label{display:flex;gap:10px;align-items:flex-start;padding:10px;border:1px solid var(--line);border-radius:12px;color:#4f5d82}.quiz-box .primary-button{justify-self:start}
.resource-grid-real{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.resource-grid-real .resource-item{min-height:92px;padding:14px}
.lesson-article ol{display:grid;gap:8px;margin:0;padding-left:20px}.lesson-side small{color:var(--muted);font-weight:800}
@media (max-width:760px){.resource-grid-real{grid-template-columns:1fr}.practice-box,.quiz-box,.notes-panel{max-width:calc(100vw - 32px)}}
@media (max-width: 1180px) {
  .lesson-screen,
  .check-page {
    grid-template-columns: 1fr;
  }
  .lesson-side,
  .check-side {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .prompt-stats,
  .featured-prompts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .prompt-category-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (max-width: 760px) {
  .lesson-screen,
  .lesson-main,
  .lesson-side,
  .prompt-page,
  .check-page,
  .check-main,
  .check-side,
  .page-search,
  .video-card,
  .check-row,
  .featured-prompt,
  .prompt-stat,
  .prompt-category {
    box-sizing: border-box;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
  }
  .page-heading,
  .lesson-hero-head,
  .lesson-footer,
  .check-row {
    grid-template-columns: 1fr;
  }
  .page-heading {
    display: grid;
    align-items: stretch;
  }
  .prompt-suggest,
  .complete-button,
  .page-heading .ghost-button,
  .lesson-footer .ghost-button,
  .lesson-footer .primary-button {
    width: 100%;
    min-width: 0;
  }
  .page-heading h1,
  .page-heading p,
  .lesson-hero-head h1,
  .lesson-hero-head p,
  .check-row h3,
  .check-row p,
  .featured-prompt h3,
  .featured-prompt p {
    max-width: 100%;
    overflow-wrap: break-word;
  }  .page-heading p,
  .lesson-hero-head p,
  .lesson-article p,
  .check-row p,
  .featured-prompt p {
    max-width: 260px;
  }
  .lesson-meta-row {
    max-width: 300px;
  }
  .check-progress .progress-bar {
    max-width: 260px;
  }
  .page-search,
  .tool-tabs,
  .lesson-tabs,
  .video-card,
  .check-row {
    max-width: calc(100vw - 32px);
  }
  .tool-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
  }
  .tool-tab {
    flex: 0 0 auto;
  }
  .lesson-hero-head {
    align-items: start;
  }
  .video-card {
    grid-template-columns: 1fr;
    min-height: 380px;
    padding: 30px 24px 66px;
  }
  .video-copy h2 {
    max-width: 270px;
    font-size: 25px;
  }
  .lesson-meta-row {
    gap: 10px;
  }
  .page-search {
    grid-template-columns: 28px minmax(0, 1fr) 38px;
  }
  .video-robot {
    width: 170px;
    height: 142px;
  }
  .video-controls {
    grid-template-columns: 24px 24px auto 1fr 24px;
  }
  .video-controls span:nth-last-child(-n+2) {
    display: none;
  }
  .lesson-tabs {
    gap: 12px;
    overflow-x: auto;
  }
  .lesson-tabs button {
    white-space: nowrap;
  }
  .lesson-side,
  .check-side,
  .prompt-stats,
  .featured-prompts,
  .prompt-category-grid {
    grid-template-columns: 1fr;
  }
  .check-row {
    justify-items: start;
  }
  .check-progress {
    width: 100%;
  }
}