body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, var(--accent-soft) 0, transparent 30rem),
    var(--bg);
}

.home-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.home-hero {
  position: relative;
  overflow: hidden;
  min-height: 330px;
  padding: 28px clamp(24px, 5vw, 64px) 40px;
  color: #fff;
  background: #231d2a;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.home-hero::after {
  content: "IELTS";
  position: absolute;
  right: -0.04em;
  bottom: -0.28em;
  color: rgba(255, 255, 255, 0.045);
  font-size: clamp(8rem, 21vw, 16rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.08em;
  pointer-events: none;
}

.home-brand {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
}

.home-brand-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 9px;
  background: var(--accent-bright);
  font-weight: 800;
}

.home-brand strong { font-weight: 700; }

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 690px;
  margin-top: clamp(38px, 7vw, 74px);
}

.eyebrow {
  color: var(--accent);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.home-hero .eyebrow { color: #ffb0c9; }

.home-hero h1 {
  max-width: 700px;
  margin-top: 8px;
  font-size: clamp(2.25rem, 6vw, 4.4rem);
  font-weight: 750;
  line-height: 1.03;
  letter-spacing: -0.055em;
}

.hero-lead {
  max-width: 62ch;
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.98rem;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 34px;
}

.hero-stat {
  display: flex;
  align-items: baseline;
  gap: 7px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.78rem;
}

.hero-stat strong {
  color: #fff;
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
}

.resume-card {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  width: calc(100% - clamp(24px, 6vw, 72px));
  margin: -20px auto 0;
  padding: 17px 20px;
  color: var(--text);
  text-decoration: none;
  background: color-mix(in srgb, var(--card) 94%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px);
}

.resume-card[hidden] { display: none; }
.resume-icon { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 13px; color: var(--accent); background: var(--accent-soft); }
.resume-icon svg { width: 20px; fill: currentColor; }
.resume-copy { min-width: 0; }
.resume-copy small { display: block; color: var(--muted); font-size: 0.72rem; font-weight: 750; letter-spacing: 0.08em; text-transform: uppercase; }
.resume-copy strong { display: block; overflow: hidden; margin-top: 2px; font-size: 1rem; text-overflow: ellipsis; white-space: nowrap; }
.resume-copy span { display: block; overflow: hidden; color: var(--muted); font-size: 0.8rem; text-overflow: ellipsis; white-space: nowrap; }
.resume-action { display: flex; align-items: center; gap: 6px; color: var(--accent); font-size: 0.84rem; font-weight: 750; white-space: nowrap; }
.resume-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.library { margin-top: 64px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.section-heading h2, .anki-panel h2 { margin-top: 3px; font-size: clamp(1.55rem, 3vw, 2.15rem); letter-spacing: -0.035em; }

.lesson-search {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 9px;
  width: min(340px, 100%);
  padding: 10px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 13px;
  box-shadow: var(--shadow-sm);
}
.lesson-search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.lesson-search svg { width: 18px; fill: none; stroke: var(--muted); stroke-width: 1.8; stroke-linecap: round; }
.lesson-search input { min-width: 0; border: 0; outline: 0; background: transparent; font-size: 0.88rem; }
.lesson-search input::placeholder { color: var(--muted); }
.lesson-search kbd { padding: 1px 6px; color: var(--muted); background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; font: 0.72rem var(--font-ui); }

.skill-tabs { margin-top: 24px; }
.skill-tabs .ui-tab { gap: 7px; }
.skill-dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; opacity: 0.55; }

.book-section, .shelf-section { margin-top: 34px; }
.book-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.book-head h3 { font-size: 1.15rem; font-weight: 800; letter-spacing: -0.02em; }
.book-head p { color: var(--muted); font-size: 0.82rem; margin-top: 2px; }
.book-head-right { display: flex; align-items: center; gap: 10px; }
.book-learned-badge {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  padding: 5px 11px;
  font-size: 0.78rem;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9999px;
  white-space: nowrap;
}
.book-learned-badge strong { color: var(--text); font-weight: 800; }
.book-learned-badge.is-all-done {
  color: var(--green);
  background: color-mix(in srgb, var(--green) 12%, var(--card));
  border-color: color-mix(in srgb, var(--green) 30%, transparent);
}
.book-learned-badge.is-all-done strong { color: var(--green); }

/* Nút chuyển đổi chế độ xem Lưới thẻ / Bảng */
.view-toggle {
  display: inline-flex;
  align-items: center;
  padding: 2px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  gap: 2px;
}
.view-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
}
.view-btn svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.view-btn:hover { color: var(--text); }
.view-btn.is-active {
  background: var(--card);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Khung hiển thị tổng quan (chuyển đổi Bảng vs Lưới thẻ) */
.book-overview { margin-top: 10px; }

/* Desktop default (>= 768px): hiện bảng, ẩn lưới thẻ */
@media (min-width: 768px) {
  .book-overview:not([data-view="cards"]) .book-table-wrap { display: block; }
  .book-overview:not([data-view="cards"]) .book-cards-wrap { display: none; }
  .book-overview[data-view="cards"] .book-table-wrap { display: none; }
  .book-overview[data-view="cards"] .book-cards-wrap { display: flex; flex-direction: column; gap: 12px; }
}

/* Mobile default (< 768px): hiện lưới thẻ tiện vuốt ngón cái, ẩn bảng (hoặc hiện bảng khi người dùng chọn) */
@media (max-width: 767px) {
  .book-overview:not([data-view="table"]) .book-table-wrap { display: none; }
  .book-overview:not([data-view="table"]) .book-cards-wrap { display: flex; flex-direction: column; gap: 12px; }
  .book-overview[data-view="table"] .book-table-wrap { display: block; }
  .book-overview[data-view="table"] .book-cards-wrap { display: none; }
}

/* Dạng Lưới Thẻ theo từng Test (Mobile-friendly) */
.book-cards-wrap { width: 100%; }
.mobile-test-card {
  padding: 12px;
  background: color-mix(in srgb, var(--card) 65%, var(--bg));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.mobile-test-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}
.mobile-test-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-decoration: none;
  color: var(--text);
}
.mobile-test-link:hover .mobile-test-title { color: var(--accent); }
.mobile-test-title { font-size: 0.95rem; font-weight: 800; letter-spacing: -0.01em; }
.mobile-test-count {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 9999px;
  background: var(--surface-2);
  color: var(--muted);
  border: 1px solid var(--border);
}
.mobile-test-count.is-complete {
  color: var(--green);
  background: color-mix(in srgb, var(--green) 12%, var(--card));
  border-color: color-mix(in srgb, var(--green) 30%, transparent);
  font-weight: 800;
}
.mobile-test-body { display: flex; flex-direction: column; gap: 10px; }
.mobile-skill-group { display: flex; flex-direction: column; }
.mobile-skill-label {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.mobile-skill-group.group-l .mobile-skill-label { color: var(--listening); }
.mobile-skill-group.group-r .mobile-skill-label { color: var(--reading); }
.mobile-lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}
@media (max-width: 350px) {
  .mobile-lesson-grid { grid-template-columns: 1fr; }
}

/* Bảng tổng quát 4 Test */
.book-table-wrap {
  position: relative;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 10px;
  background: color-mix(in srgb, var(--card) 45%, var(--bg));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.book-table-wrap::-webkit-scrollbar { height: 6px; }
.book-table-wrap::-webkit-scrollbar-track { background: transparent; }
.book-table-wrap::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--muted) 35%, transparent);
  border-radius: 3px;
}

.book-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 6px;
  table-layout: fixed;
  min-width: 840px;
}
.book-table-wrap[data-skill="L"] .book-table { min-width: 540px; }
.book-table-wrap[data-skill="R"] .book-table { min-width: 440px; }

.col-w-test { width: 86px; }

/* Header hàng nhóm và cột */
.table-group-row th {
  padding: 6px 10px;
  text-align: center;
}
.col-test-head {
  position: sticky;
  left: 0;
  z-index: 3;
  background: color-mix(in srgb, var(--card) 45%, var(--bg));
  text-align: left !important;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 8px;
}
.col-group-head {
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 8px;
}
.group-l {
  color: var(--listening);
  background: color-mix(in srgb, var(--listening) 14%, var(--card));
  border: 1px solid color-mix(in srgb, var(--listening) 25%, transparent);
}
.group-r {
  color: var(--reading);
  background: color-mix(in srgb, var(--reading) 14%, var(--card));
  border: 1px solid color-mix(in srgb, var(--reading) 25%, transparent);
}
.table-sub-row th {
  padding: 2px 4px 6px;
  text-align: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
}
.part-short { display: none; }
@media (max-width: 1024px) {
  .part-full { display: none; }
  .part-short { display: inline; }
}

/* Ô Test (cột đầu tiên cố định bên trái) */
.cell-test {
  position: sticky;
  left: 0;
  z-index: 2;
  padding: 0;
  vertical-align: stretch;
  background: color-mix(in srgb, var(--card) 45%, var(--bg));
}
.test-row-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  height: 100%;
  min-height: 64px;
  padding: 8px 10px;
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: all 0.15s ease;
}
.test-row-link:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--card));
  transform: translateY(-1px);
}
.test-row-title {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
}
.test-row-link:hover .test-row-title { color: var(--accent); }
.test-row-count {
  margin-top: 4px;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--muted);
}
.test-row-count.is-complete {
  color: var(--green);
  font-weight: 800;
}

/* Ô Bài học */
.cell-lesson {
  padding: 0;
  vertical-align: stretch;
}
.lesson-cell-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  min-height: 64px;
  padding: 7px 9px 8px;
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.lesson-cell-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.lesson-cell-card[data-skill="L"]:hover {
  border-color: color-mix(in srgb, var(--listening) 65%, var(--border));
}
.lesson-cell-card[data-skill="R"]:hover {
  border-color: color-mix(in srgb, var(--reading) 65%, var(--border));
}

.cell-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
  margin-bottom: 4px;
}
.cell-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  line-height: 1.2;
  padding: 1px 5px;
  border-radius: 5px;
}
.lesson-cell-card[data-skill="L"] .cell-tag {
  color: var(--listening);
  background: var(--listening-soft);
}
.lesson-cell-card[data-skill="R"] .cell-tag {
  color: var(--reading);
  background: var(--reading-soft);
}
.cell-badges {
  display: flex;
  align-items: center;
  gap: 4px;
}
.cell-anki-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--green);
  color: #ffffff;
  font-size: 9px;
  font-weight: 900;
  line-height: 1;
}
.cell-check-btn,
.card-check-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 17px;
  height: 17px;
  padding: 0;
  border-radius: 50%;
  border: 1.5px solid color-mix(in srgb, var(--border) 90%, transparent);
  background: var(--surface-2, transparent);
  color: transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 1;
  flex-shrink: 0;
}
.lesson-cell-card:hover .cell-check-btn,
.lesson-card:hover .card-check-btn {
  border-color: color-mix(in srgb, var(--green) 45%, var(--border));
  color: color-mix(in srgb, var(--green) 50%, transparent);
}
.cell-check-btn:hover,
.card-check-btn:hover {
  border-color: var(--green) !important;
  background: color-mix(in srgb, var(--green) 16%, var(--card)) !important;
  color: var(--green) !important;
  transform: scale(1.15);
}
.cell-check-btn.is-learned,
.card-check-btn.is-learned {
  border-color: var(--green) !important;
  background: var(--green) !important;
  color: #ffffff !important;
}
.cell-check-btn.is-learned:hover,
.card-check-btn.is-learned:hover {
  background: color-mix(in srgb, var(--green) 85%, #000) !important;
  border-color: color-mix(in srgb, var(--green) 85%, #000) !important;
  transform: scale(1.15);
}
.card-tail {
  display: flex;
  align-items: center;
  gap: 8px;
}
.cell-last-badge {
  font-size: 0.58rem;
  font-weight: 800;
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--accent);
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.2;
}
.cell-name {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.77rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
  word-break: break-word;
}
.lesson-cell-card:hover .cell-name { color: var(--text); }

/* Bài đã học (tự tích hoặc đã nạp thẻ) */
.lesson-cell-card.is-learned,
.lesson-cell-card.has-anki {
  border-color: color-mix(in srgb, var(--green) 30%, var(--border));
  background: color-mix(in srgb, var(--green) 6%, var(--card));
}
.lesson-cell-card.is-learned:hover,
.lesson-cell-card.has-anki:hover {
  border-color: var(--green);
}
.lesson-cell-card.is-learned .cell-tag,
.lesson-cell-card.has-anki .cell-tag {
  color: var(--green) !important;
  background: color-mix(in srgb, var(--green) 16%, var(--card)) !important;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--green) 30%, transparent);
}

/* Bài đang học */
.lesson-cell-card.is-last {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 2px var(--accent-soft);
}

/* Bài chỉ có thẻ Anki (off) */
.lesson-cell-card.off {
  background: transparent;
  border-style: dashed;
  box-shadow: none;
}
.lesson-cell-card.off:hover {
  transform: none;
  border-color: var(--border);
}
.lesson-cell-card.off .cell-name { color: var(--muted); }

/* Ô trống */
.cell-empty {
  padding: 0;
  vertical-align: stretch;
}
.cell-dash {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 64px;
  color: var(--muted);
  opacity: 0.35;
  border: 1px dashed color-mix(in srgb, var(--border) 60%, transparent);
  border-radius: 10px;
  font-size: 0.85rem;
}
.skill-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.skill-columns.cols-1 { grid-template-columns: minmax(0, 1fr); }
.skill-columns.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.skill-column {
  min-width: 0;
  padding: 16px;
  background: color-mix(in srgb, var(--card) 74%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.skill-column-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.skill-column-head h4 { font-size: 0.82rem; letter-spacing: 0.055em; text-transform: uppercase; }
.skill-column-head span { color: var(--muted); font-size: 0.72rem; }
.lesson-list { display: grid; gap: 8px; list-style: none; }

.lesson-card {
  position: relative;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  min-height: 68px;
  padding: 10px 11px;
  color: var(--text);
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 13px;
  box-shadow: var(--shadow-sm);
}
.lesson-card:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.lesson-card.off { color: var(--muted); background: transparent; border-style: dashed; box-shadow: none; }
.lesson-card.off:hover { transform: none; border-color: var(--border); }
.lesson-index { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 11px; color: var(--accent); background: var(--accent-soft); font-size: 0.78rem; font-weight: 800; }
.lesson-card[data-skill="L"] .lesson-index { color: var(--listening); background: var(--listening-soft); }
.lesson-card[data-skill="R"] .lesson-index { color: var(--reading); background: var(--reading-soft); }
.lesson-card[data-skill="W"] .lesson-index { color: var(--writing); background: var(--writing-soft); }
.lesson-card[data-skill="S"] .lesson-index { color: var(--speaking); background: var(--speaking-soft); }
.lesson-title { display: block; overflow: hidden; font-size: 0.87rem; font-weight: 700; line-height: 1.3; text-overflow: ellipsis; }
.lesson-meta { display: block; margin-top: 3px; color: var(--muted); font-size: 0.72rem; }
.lesson-go { color: var(--muted); font-size: 1.2rem; }

.empty-panel {
  padding: 46px 24px;
  color: var(--muted);
  text-align: center;
  background: var(--surface-2);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}
.empty-panel strong { display: block; color: var(--text); margin-bottom: 4px; }

.search-results { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 26px; }
.search-results .empty-panel { grid-column: 1 / -1; }

.shelf-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.shelf-card { min-height: 96px; }
.shelf-card .lesson-index { width: 48px; height: 48px; }

.anki-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: 42px;
  align-items: center;
  margin-top: 66px;
  padding: clamp(24px, 5vw, 48px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}
.anki-panel p:not(.eyebrow) { max-width: 58ch; margin-top: 10px; color: var(--muted); }
.anki-panel details { padding: 14px 16px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 13px; }
.anki-panel summary { cursor: pointer; font-size: 0.86rem; font-weight: 700; }
.commands { display: grid; gap: 7px; margin-top: 12px; }
.commands code { overflow-x: auto; padding: 8px 10px; color: var(--text); background: var(--code); border-radius: 7px; font-size: 0.74rem; white-space: nowrap; }

/* Thẻ bài học gần nhất (trang Test / Sách, browse.js) */
.lesson-card.is-last { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.lesson-badge { margin-right: 6px; padding: 1px 6px; color: var(--accent); background: var(--accent-soft); border-radius: 6px; font-size: 0.66rem; font-weight: 800; }

/* Bài đã học (tự tích hoặc đã nạp thẻ) */
.lesson-card.is-learned,
.lesson-card.has-anki {
  border-color: color-mix(in srgb, var(--green) 26%, var(--border));
}
.lesson-card.is-learned:hover,
.lesson-card.has-anki:hover {
  border-color: color-mix(in srgb, var(--green) 55%, var(--border));
}
.lesson-card.is-learned .lesson-index,
.lesson-card.is-learned[data-skill] .lesson-index,
.lesson-card.has-anki .lesson-index,
.lesson-card.has-anki[data-skill] .lesson-index {
  position: relative;
  color: var(--green) !important;
  background: color-mix(in srgb, var(--green) 14%, var(--card)) !important;
  box-shadow: inset 0 0 0 1.5px color-mix(in srgb, var(--green) 32%, transparent);
}
.lesson-card.is-learned .lesson-index::after,
.lesson-card.has-anki .lesson-index::after {
  content: "✓";
  position: absolute;
  top: -5px;
  right: -5px;
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 900;
  color: #ffffff;
  background: var(--green);
  border-radius: 9999px;
  border: 2px solid var(--card);
  line-height: 1;
}
.lesson-card.is-learned .lesson-go,
.lesson-card.has-anki .lesson-go {
  color: var(--green);
}
.lesson-badge.learned-badge,
.lesson-badge.anki-badge {
  color: var(--green);
  background: color-mix(in srgb, var(--green) 12%, var(--card));
  border: 1px solid color-mix(in srgb, var(--green) 28%, transparent);
}

/* Trang Sách lessons/<sách>/ và trang Test lessons/<sách>/test<N>/ (browse.js) */
.browse-head { margin-bottom: 24px; }
.browse-head h1 { margin-top: 4px; font-size: clamp(1.9rem, 4vw, 2.6rem); line-height: 1.1; letter-spacing: -0.04em; }
.browse-head p:not(.eyebrow) { margin-top: 6px; color: var(--muted); font-size: 0.88rem; }
.browse-test + .browse-test { margin-top: 34px; }
.browse-test .book-head h3 a { color: inherit; text-decoration: none; }
.browse-test .book-head h3 a:hover { color: var(--accent); }
.browse-open {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 7px 13px;
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.browse-open:hover { border-color: var(--accent); background: var(--accent-soft); }

footer { padding-top: 32px; color: var(--muted); font-size: 0.76rem; text-align: center; }

@media (max-width: 900px) {
  .skill-columns, .search-results { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .skill-column:last-child { grid-column: 1 / -1; }
  .anki-panel { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 640px) {
  .home-shell { width: min(100% - 24px, 1180px); padding-top: 12px; }
  .home-hero { min-height: 370px; padding: 20px 20px 42px; border-radius: 22px; }
  .hero-copy { margin-top: 48px; }
  .home-hero h1 { font-size: 2.5rem; }
  .hero-lead { font-size: 0.9rem; }
  .hero-stats { gap: 10px 20px; margin-top: 26px; }
  .resume-card { width: calc(100% - 16px); grid-template-columns: auto minmax(0, 1fr); gap: 12px; padding: 14px; }
  .resume-action { display: none; }
  .library { margin-top: 48px; }
  .section-heading { align-items: stretch; flex-direction: column; gap: 16px; }
  .lesson-search { width: 100%; }
  .skill-tabs { width: 100%; overflow-x: auto; }
  .book-head { align-items: stretch; flex-direction: column; gap: 8px; }
  .book-head-right { justify-content: space-between; }
  .browse-open { justify-content: center; }
  .book-table-wrap { padding: 6px; border-radius: var(--radius-md); }
  .book-table { border-spacing: 4px; }
  .col-w-test { width: 72px; }
  .test-row-link { padding: 6px 6px; min-height: 56px; }
  .test-row-title { font-size: 0.82rem; }
  .lesson-cell-card { min-height: 56px; padding: 5px 6px 6px; }
  .cell-name { font-size: 0.72rem; }
  .skill-columns, .skill-columns.cols-1, .skill-columns.cols-2, .skill-columns.cols-3,
  .search-results, .shelf-grid { grid-template-columns: 1fr; }
  .skill-column:last-child { grid-column: auto; }
  .anki-panel { margin-top: 48px; padding: 24px 20px; border-radius: 20px; }
}