/* ============================================================
   LANDING – DE THI THU TIENG ANH (scoped .knv-etl-*)
   All layout via Bootstrap .row/.col-* – no CSS Grid
   max-width media queries only
   ============================================================ */

/* ---- BASE SECTION ---------------------------------------- */
.knv-etl-section {
  padding: 80px 0;
  position: relative;
}
.knv-etl-section--alt {
  background: var(--surface-alt, #f4f6f9);
}
.knv-etl-section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}
.knv-etl-section__eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}
.knv-etl-section__title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.2;
}
.knv-etl-section__subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 0;
}

/* ---- HERO – centered typography, no split col ------------ */
.knv-etl-hero {
  position: relative;
  padding: 140px 0 148px; /* large bottom for paper rail to sit in */
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, #0ea5e9 100%);
  color: #fff;
  text-align: center;
  overflow: hidden;
}
.knv-etl-hero::before,
.knv-etl-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
}
.knv-etl-hero::before {
  width: 420px;
  height: 420px;
  background: var(--secondary);
  top: -120px;
  right: -80px;
}
.knv-etl-hero::after {
  width: 360px;
  height: 360px;
  background: #0ea5e9;
  bottom: -80px;
  left: -60px;
}
.knv-etl-hero__inner {
  position: relative;
  z-index: 2;
}
.knv-etl-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 13px;
  font-weight: 600;
  backdrop-filter: blur(8px);
  margin-bottom: 20px;
}
.knv-etl-hero__title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.12;
  margin: 0 0 18px;
}
.knv-etl-hero__title em {
  font-style: normal;
  background: linear-gradient(90deg, var(--secondary), #fff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.knv-etl-hero__desc {
  font-size: 18px;
  opacity: 0.92;
  margin: 0 auto 28px;
  max-width: 560px;
}
.knv-etl-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
  justify-content: center;
}
.knv-etl-hero__trust {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}
.knv-etl-hero__avatars {
  display: flex;
}


.knv-etl-hero__avatars span {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: var(--secondary);
  margin-left: -10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--navy);
  overflow: hidden;
  pointer-events: none;
}
.knv-etl-hero__avatars img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.knv-etl-hero__avatars span:first-child {
  margin-left: 0;
}
.knv-etl-hero__trust-text {
  font-size: 14px;
  opacity: 0.9;
}
.knv-etl-hero__trust-text strong {
  font-weight: 700;
}

/* ---- PAPER RAIL ------------------------------------------ */
.knv-etl-paper-rail {
  position: relative;
  z-index: 4;
  margin-top: -88px;  /* pull up over hero bottom */
  margin-bottom: -44px; /* overlap gallery section top */
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 0 16px;
  pointer-events: none;
  overflow: visible;
}
.knv-etl-paper {
  flex-shrink: 0;
  width: 130px;
  min-height: 170px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.16), 0 2px 8px rgba(0, 0, 0, 0.08);
  padding: 14px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.knv-etl-paper--1 { transform: rotate(-4deg) translateY(8px); }
.knv-etl-paper--2 { transform: rotate(2deg)  translateY(-4px); }
.knv-etl-paper--3 { transform: rotate(-2deg) translateY(4px); }
.knv-etl-paper--4 { transform: rotate(3deg)  translateY(-6px); }
.knv-etl-paper__title {
  width: 70%;
  height: 9px;
  background: var(--primary-light);
  border-radius: 4px;
  margin-bottom: 3px;
}
.knv-etl-paper__line {
  height: 6px;
  background: var(--border);
  border-radius: 4px;
}
.knv-etl-paper__line--short { width: 55%; }
.knv-etl-paper__line--mid   { width: 80%; }
.knv-etl-paper__badge {
  height: 18px;
  width: 52%;
  border-radius: 100px;
  margin-top: 4px;
}
.knv-etl-paper--1 .knv-etl-paper__badge { background: var(--primary-light); }
.knv-etl-paper--2 .knv-etl-paper__badge { background: var(--secondary-light); }
.knv-etl-paper--3 .knv-etl-paper__badge { background: #dbf4e7; }
.knv-etl-paper--4 .knv-etl-paper__badge { background: #ffe9d6; }

/* ---- EXAM GALLERY CARDS ---------------------------------- */
.knv-etl-gallery {
  padding-top: 100px; /* accounts for paper rail overlap */
}
.knv-etl-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 20px;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.knv-etl-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--primary-light);
}
.knv-etl-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
}
.knv-etl-card__grade {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
}
.knv-etl-card__tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: var(--secondary-light);
  color: var(--secondary);
  font-size: 11px;
  font-weight: 700;
}
.knv-etl-card__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  margin: 0;
  line-height: 1.4;
}
.knv-etl-card__preview {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  padding: 10px 12px;
  background: var(--surface-alt, #f4f6f9);
  border-left: 3px solid var(--primary-light);
  border-radius: 0 6px 6px 0;
  margin: 0;
  line-height: 1.5;
  flex: 1;
}
.knv-etl-card__meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.knv-etl-card__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--text-secondary);
}
.knv-etl-card__meta-item iconify-icon {
  font-size: 13px;
  color: var(--primary);
}
.knv-etl-card__topics {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}
.knv-etl-card__topic {
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 11px;
  font-weight: 600;
}
.knv-etl-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.knv-etl-card__attempted {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}
.knv-etl-card__attempted iconify-icon {
  color: var(--secondary);
  font-size: 13px;
}
.knv-etl-diff {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}
.knv-etl-diff--easy { background: #dbf4e7; color: var(--success); }
.knv-etl-diff--med  { background: #fff3cd; color: var(--warning); }
.knv-etl-diff--hard { background: #fde8e8; color: var(--danger); }

/* ---- CARD ACTION BUTTON ---------------------------------- */
.knv-etl-card__actions {
  display: flex;
  margin-top: 2px;
}
.knv-etl-card__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 10px 16px;
  border-radius: var(--radius-md, 12px);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  -webkit-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  -moz-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  -ms-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  -o-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.knv-etl-card__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 94, 184, 0.45);
  color: #fff;
}
.knv-etl-card__btn iconify-icon {
  font-size: 13px;
}

/* ---- LOAD MORE BUTTON ------------------------------------ */
.knv-etl-load-more {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 32px;
  border-radius: var(--radius-pill, 50px);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.knv-etl-load-more:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 94, 184, 0.45);
  -webkit-transform: translateY(-2px);
  -moz-transform: translateY(-2px);
  -ms-transform: translateY(-2px);
  -o-transform: translateY(-2px);
}
.knv-etl-load-more iconify-icon {
  font-size: 14px;
  transition: transform 0.3s ease;
}
.knv-etl-load-more:hover iconify-icon {
  transform: translateY(2px);
}

/* ---- LAZY SECTION REVEAL --------------------------------- */
.knv-etl-lazy-section {
  transition: opacity 0.34s cubic-bezier(0.4, 0, 0.2, 1), transform 0.34s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}
.knv-etl-lazy-section--loading {
  opacity: 0;
  transform: translateY(8px);
}

/* ---- SKELETON LOADING ------------------------------------ */
@keyframes knv-etl-shimmer {
  0%   { background-position: -600px 0; }
  100% { background-position: 600px 0; }
}
.knv-etl-skeleton {
  background: linear-gradient(90deg, #E2E8F0 0%, #F1F5F9 20%, #FFFFFF 40%, #F1F5F9 60%, #E2E8F0 80%);
  background-size: 1200px 100%;
  animation: knv-etl-shimmer 1.6s ease-in-out infinite;
  border-radius: var(--radius-sm, 8px);
  will-change: background-position;
}
.knv-etl-card--skeleton {
  pointer-events: none;
}
.knv-etl-skeleton--grade {
  display: inline-block;
  width: 80px;
  height: 22px;
  border-radius: var(--radius-pill);
}
.knv-etl-skeleton--tag {
  display: inline-block;
  width: 60px;
  height: 18px;
  border-radius: var(--radius-pill);
}
.knv-etl-skeleton--title {
  width: 85%;
  height: 18px;
  margin: 2px 0;
}
.knv-etl-skeleton--preview {
  width: 100%;
  height: 44px;
  border-radius: 0 6px 6px 0;
}
.knv-etl-skeleton--meta {
  width: 70px;
  height: 14px;
}
.knv-etl-skeleton--topic {
  display: inline-block;
  width: 48px;
  height: 18px;
  border-radius: 4px;
}
.knv-etl-skeleton--attempted {
  width: 90px;
  height: 14px;
}
.knv-etl-skeleton--diff {
  width: 50px;
  height: 18px;
  border-radius: var(--radius-pill);
}
.knv-etl-gallery-fade {
  transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.knv-etl-skeleton--anatomy-nav {
  width: 100%;
  height: 46px;
  border-radius: var(--radius-lg);
  margin-bottom: 6px;
}
.knv-etl-skeleton--anatomy-title {
  width: 55%;
  height: 26px;
  margin-bottom: 12px;
}
.knv-etl-skeleton--anatomy-lead {
  width: 90%;
  height: 44px;
  margin-bottom: 20px;
}
.knv-etl-skeleton--anatomy-topic {
  width: 100%;
  height: 50px;
  margin-bottom: 10px;
  border-radius: var(--radius-lg);
}
.knv-etl-skeleton--anatomy-sample {
  width: 100%;
  height: 120px;
  border-radius: var(--radius-xl);
  margin-top: 22px;
}
.knv-etl-skeleton--grade-tab {
  display: inline-block;
  width: 80px;
  height: 42px;
  border-radius: var(--radius-pill);
}
.knv-etl-skeleton--grade-card {
  width: 100%;
  height: 360px;
  border-radius: var(--radius-xl);
  margin-top: 28px;
}

/* ---- MINI QUIZ ------------------------------------------- */
.knv-etl-quiz-wrap {
  max-width: 680px;
  margin: 0 auto;
}
.knv-etl-quiz {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

/* Splash – redesigned: gold-ring badge, eyebrow chip, polished meta pills */
.knv-etl-quiz__splash {
  padding: 56px 32px 40px;
  text-align: center;
  position: relative;
  background:
    radial-gradient(circle at 50% 0%, rgba(196,163,90,0.10), transparent 55%),
    var(--surface);
}
.knv-etl-quiz__splash::before {
  /* Subtle paper-grid texture */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(1,42,74,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(1,42,74,0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000, transparent 75%);
  pointer-events: none;
}
.knv-etl-quiz__splash > * { position: relative; z-index: 1; }

.knv-etl-quiz__splash-badge {
  position: relative;
  width: 84px;
  height: 84px;
  margin: 0 auto 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.knv-etl-quiz__splash-badge-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px dashed var(--primary);
  opacity: 0.5;
  animation: knv-etl-spin 18s linear infinite;
  -webkit-animation: knv-etl-spin 18s linear infinite;
}
.knv-etl-quiz__splash-badge-core {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  color: var(--white-color);
}
.knv-etl-quiz__splash-badge-core iconify-icon {
  font-size: 30px;
}
@keyframes knv-etl-spin {
  to { transform: rotate(360deg); -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); -o-transform: rotate(360deg); }
}

.knv-etl-quiz__splash-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 14px;
}
.knv-etl-quiz__splash-eyebrow iconify-icon {
  color: var(--secondary);
  font-size: 14px;
}
.knv-etl-quiz__splash-title {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 10px;
  letter-spacing: -0.3px;
}
.knv-etl-quiz__splash-desc {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 460px;
  margin: 0 auto 26px;
  line-height: 1.65;
}
.knv-etl-quiz__splash-meta {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.knv-etl-quiz__splash-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
}
.knv-etl-quiz__splash-meta-item strong {
  color: var(--navy);
  font-weight: 800;
}
.knv-etl-quiz__splash-meta-item iconify-icon {
  color: var(--primary);
  font-size: 16px;
}
.knv-etl-quiz__splash-meta-item img {
  width:16px;
  height:16px;
  object-fit: contain;
}

.knv-etl-quiz__splash-cta {
  margin-bottom: 18px;
}
.knv-etl-quiz__splash-foot {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  line-height: 1.2;
}
.knv-etl-quiz__splash-foot iconify-icon {
  color: var(--success);
  font-size: 13px;
}

/* Active (running) */
.knv-etl-quiz__active {
  display: none;
}
.knv-etl-quiz__result {
  display: none;
}

.knv-etl-quiz__hdr {
  padding: 14px 20px;
  background: var(--navy);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 12px;
}
.knv-etl-quiz__progress-bar {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  overflow: hidden;
}
.knv-etl-quiz__progress-fill {
  height: 100%;
  background: var(--secondary);
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}
.knv-etl-quiz__qcount {
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  opacity: 0.9;
}
.knv-etl-quiz__timer {
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: rgba(255, 255, 255, 0.12);
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.knv-etl-quiz__timer--warn {
  background: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.knv-etl-quiz__body {
  padding: 28px 28px 16px;
}
.knv-etl-quiz__q-type {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 8px;
}
.knv-etl-quiz__q-text {
  font-size: 17px;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.55;
  margin-bottom: 20px;
}
.knv-etl-quiz__options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.knv-etl-quiz__option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
  font-size: 15px;
  color: var(--text-primary);
  text-align: left;
  width: 100%;
}
.knv-etl-quiz__option:hover:not([disabled]) {
  border-color: var(--primary);
  background: var(--primary-light);
}
.knv-etl-quiz__option--selected {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}
.knv-etl-quiz__option--correct {
  border-color: var(--success);
  background: #dbf4e7;
  color: var(--success);
  font-weight: 600;
}
.knv-etl-quiz__option--wrong {
  border-color: var(--danger);
  background: #fde8e8;
  color: var(--danger);
  font-weight: 600;
}
.knv-etl-quiz__opt-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.knv-etl-quiz__option--selected .knv-etl-quiz__opt-letter {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.knv-etl-quiz__option--correct .knv-etl-quiz__opt-letter {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}
.knv-etl-quiz__option--wrong .knv-etl-quiz__opt-letter {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.knv-etl-quiz__nav {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
}
.knv-etl-quiz__nav-prev,
.knv-etl-quiz__nav-next,
.knv-etl-quiz__nav-submit {
  padding: 9px 20px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}
.knv-etl-quiz__nav-prev {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
}
.knv-etl-quiz__nav-prev:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.knv-etl-quiz__nav-next {
  background: var(--primary);
  color: #fff;
  margin-left: auto;
}
.knv-etl-quiz__nav-next:hover { background: var(--primary-dark); }
.knv-etl-quiz__nav-submit {
  background: var(--secondary);
  color: var(--navy);
  margin-left: auto;
  display: none;
}
.knv-etl-quiz__nav-submit:hover { background: var(--secondary-hover); }

/* Result */
.knv-etl-quiz__result-inner {
  padding: 40px 32px;
  text-align: center;
}
.knv-etl-quiz__score-ring {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  border: 4px solid var(--primary);
}
.knv-etl-quiz__score-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--navy);
  line-height: 1;
}
.knv-etl-quiz__score-den {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}
.knv-etl-quiz__result-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 8px;
}
.knv-etl-quiz__result-msg {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 380px;
  margin: 0 auto 24px;
  line-height: 1.6;
}
.knv-etl-quiz__result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- EXAM ANATOMY ---------------------------------------- */
.knv-etl-anatomy__nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: sticky;
  top: 80px;
}
.knv-etl-anatomy__nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  width: 100%;
}
.knv-etl-anatomy__nav-item:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  background: var(--primary-light);
}
.knv-etl-anatomy__nav-item--active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}
.knv-etl-anatomy__nav-item iconify-icon {
  font-size: 18px;
  flex-shrink: 0;
}
.knv-etl-anatomy__panel {
  display: none;
}
.knv-etl-anatomy__panel--active {
  display: block;
}
.knv-etl-anatomy__panel-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 10px;
}
.knv-etl-anatomy__panel-lead {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.65;
}
.knv-etl-anatomy__topics {
  list-style: none;
  padding: 0;
  margin: 0 0 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: knv-etl-topic;
}
.knv-etl-anatomy__topic {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px 14px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: 14.5px;
  color: var(--text-primary);
  line-height: 1.55;
  position: relative;
  transition: all var(--transition-fast);
  counter-increment: knv-etl-topic;
}
.knv-etl-anatomy__topic::before {
  content: counter(knv-etl-topic, decimal-leading-zero);
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px -2px rgba(0,94,184,0.35);
}
.knv-etl-anatomy__topic:nth-child(2)::before {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
  color: var(--navy);
  box-shadow: 0 4px 12px -2px rgba(196,163,90,0.45);
}
.knv-etl-anatomy__topic:nth-child(3)::before {
  background: linear-gradient(135deg, var(--success), #34d399);
  box-shadow: 0 4px 12px -2px rgba(16,185,129,0.35);
}
.knv-etl-anatomy__topic:hover {
  transform: translateX(4px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-card);
}
.knv-etl-anatomy__topic iconify-icon {
  /* Hide the legacy check icon — number badge replaces it */
  display: none;
}

.knv-etl-anatomy__sample {
  padding: 22px 24px 20px;
  background:
    linear-gradient(135deg, var(--navy), var(--primary-dark));
  color: rgba(255, 255, 255, 0.92);
  border-radius: var(--radius-xl);
  font-size: 15px;
  font-style: normal;
  line-height: 1.7;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(196,163,90,0.25);
}
.knv-etl-anatomy__sample::before {
  /* Big gold quote mark in the background */
  content: "\201C";
  position: absolute;
  top: -28px;
  right: 12px;
  font-size: 140px;
  font-family: Georgia, serif;
  color: var(--secondary);
  opacity: 0.14;
  line-height: 1;
  pointer-events: none;
}

.knv-etl-anatomy__sample > * { position: relative; z-index: 1; }
.knv-etl-anatomy__sample strong {
  color: var(--secondary);
  font-weight: 700;
  font-style: italic;
  text-decoration: underline;
  text-decoration-color: rgba(196,163,90,0.45);
  text-underline-offset: 3px;
}
.knv-etl-anatomy__sample-ans {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed rgba(196,163,90,0.35);
  font-style: normal;
  font-size: 13px;
  color: var(--secondary);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.knv-etl-anatomy__sample-ans::before {
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--secondary);
  color: var(--navy);
  font-size: 12px;
  font-weight: 800;
  flex-shrink: 0;
}

/* ---- GRADE TABS ------------------------------------------ */
.knv-etl-grade-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 32px;
}
.knv-etl-grade-tab {
  padding: 11px 28px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: 0.3px;
}
.knv-etl-grade-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}
.knv-etl-grade-tab--active {
  border-color: var(--navy);
  background: linear-gradient(135deg, var(--navy), var(--primary-dark));
  color: #fff;
  box-shadow: 0 8px 20px -6px rgba(1, 42, 74, 0.45);
}
.knv-etl-grade-tab--active:hover { color: #fff; transform: translateY(-2px); }

.knv-etl-grade-panel {
  display: none;
}
.knv-etl-grade-panel--active {
  display: block;
  animation: knv-etl-fade-in 0.35s ease;
}
@keyframes knv-etl-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Grade card — main wrapper */
.knv-etl-grade-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
}

/* Header */
.knv-etl-grade-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 28px 32px 24px;
  border-bottom: 1px dashed var(--border);
}
.knv-etl-grade-card__head-left {
  flex: 1 1 280px;
  min-width: 0;
}
.knv-etl-grade-card__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--navy);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.knv-etl-grade-card[data-grade-tone="gold"] .knv-etl-grade-card__badge {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
  color: var(--navy);
}
.knv-etl-grade-card__title {
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 800;
  color: var(--navy);
  margin: 0 0 6px;
  letter-spacing: -0.3px;
}
.knv-etl-grade-card__sub {
  font-size: 14.5px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}
.knv-etl-grade-card__stats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.knv-etl-grade-card__stat {
  min-width: 88px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  text-align: center;
  line-height: 1.1;
}
.knv-etl-grade-card__stat strong {
  display: block;
  font-size: 20px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 2px;
}
.knv-etl-grade-card__stat strong small {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
}
.knv-etl-grade-card__stat span {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

/* Body */
.knv-etl-grade-card__body {
  padding: 26px 32px 22px;
}
.knv-etl-grade-card__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.knv-etl-grade-card__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.knv-etl-grade-card__item-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.5px;
}
.knv-etl-grade-card[data-grade-tone="gold"] .knv-etl-grade-card__item-num {
  background: var(--secondary-light);
  color: var(--secondary);
}
.knv-etl-grade-card[data-grade-tone="success"] .knv-etl-grade-card__item-num {
  background: #dbf4e7;
  color: var(--success);
}
.knv-etl-grade-card__item > div { min-width: 0; }
.knv-etl-grade-card__item strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 3px;
  line-height: 1.4;
}
.knv-etl-grade-card__item span {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Paper preview — right column */
.knv-etl-grade-card__preview {
  background: linear-gradient(180deg, #fdfaf2 0%, #f5eedb 100%);
  border: 1px solid #ead9a6;
  border-radius: var(--radius-lg);
  padding: 0;
  overflow: hidden;
  box-shadow:
    0 14px 30px -16px rgba(1,42,74,0.25),
    inset 0 1px 0 rgba(255,255,255,0.6);
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.knv-etl-grade-card__preview-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 14px 16px 10px;
  font-size: 11px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: 1.2px;
  border-bottom: 1px dashed #d8c98a;
}
.knv-etl-grade-card__preview-head > span:first-child { flex: 1; }
.knv-etl-grade-card__preview-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #d8c98a;
}
.knv-etl-grade-card__preview-body {
  padding: 14px 16px 12px;
  flex: 1;
}
.knv-etl-grade-card__preview-body p {
  margin: 0 0 8px;
  font-size: 13.5px;
  color: var(--navy);
  line-height: 1.55;
}
.knv-etl-grade-card__preview-body p.text-muted {
  color: var(--text-secondary) !important;
  font-style: italic;
}
.knv-etl-grade-card__preview-opts {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 6px;
}
.knv-etl-grade-card__preview-opts span {
  font-size: 12.5px;
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(216,201,138,0.5);
}
.knv-etl-grade-card__preview-foot {
  padding: 10px 16px;
  background: rgba(255,255,255,0.5);
  border-top: 1px dashed #d8c98a;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.3px;
}
.knv-etl-grade-card__preview-foot iconify-icon {
  color: var(--secondary);
  font-size: 13px;
}

/* Footer with topics + CTA */
.knv-etl-grade-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px 32px 24px;
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
}
.knv-etl-grade-card__topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.knv-etl-grade-card__topics span {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.knv-etl-grade-card__foot .knv-btn {
  margin-left: auto;
}

/* Responsive tweaks for grade card */
@media (max-width: 991.98px) {
  .knv-etl-grade-card__head,
  .knv-etl-grade-card__body,
  .knv-etl-grade-card__foot {
    padding-left: 22px;
    padding-right: 22px;
  }
  .knv-etl-grade-card__stats { width: 100%; }
  .knv-etl-grade-card__stat  { flex: 1; min-width: 0; }
}
@media (max-width: 576px) {
  .knv-etl-grade-card__head { padding: 20px 18px 16px; }
  .knv-etl-grade-card__body { padding: 18px 18px 14px; }
  .knv-etl-grade-card__foot { padding: 14px 18px 18px; flex-direction: column; align-items: stretch; }
  .knv-etl-grade-card__foot .knv-btn { margin-left: 0; justify-content: center; }
  .knv-etl-grade-card__stat { padding: 10px 12px; min-width: 0; }
  .knv-etl-grade-card__stat strong { font-size: 17px; }
  .knv-etl-grade-card__title { font-size: 20px; }
}

/* ---- FAQ ------------------------------------------------- */
.knv-etl-faq .accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg) !important;
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--surface);
}
.knv-etl-faq .accordion-button {
  font-size: 16px;
  font-weight: 600;
  color: var(--navy);
  padding: 18px 22px;
  background: var(--surface);
}
.knv-etl-faq .accordion-button:not(.collapsed) {
  background: var(--primary-light);
  color: var(--primary);
  box-shadow: none;
}
.knv-etl-faq .accordion-button:focus {
  box-shadow: none;
  border-color: transparent;
}
.knv-etl-faq .accordion-body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 10px 22px 15px;
}

/* ---- FINAL CTA ------------------------------------------- */
.knv-etl-finalcta {
  position: relative;
  overflow: hidden;
  padding: 80px 0;
  background: #003d7a;
  color: #fff;
  text-align: center;
}

.knv-etl-finalcta__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}
.knv-etl-finalcta__title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 14px;
}
.knv-etl-finalcta__desc {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 28px;
}
.knv-btn-gold {
  color: var(--white-color);
}
.knv-btn-gold:hover {
  color: var(--white-color);
}
/* Iter 4: trạng thái "Đã đóng" cho card đề thi */
.knv-etl-card__btn--closed {
  background: var(--bg, #f3f6fb);
  color: var(--text-muted, #8896a6);
  cursor: not-allowed;
  pointer-events: none;
  border: 1px solid var(--border, #e3e8ef);
}
.knv-etl-card__btn--closed iconify-icon {
  color: var(--text-muted, #8896a6);
}
.knv-etl-card[data-closed="true"] {
  opacity: 0.75;
}

/* ---- RESPONSIVE (max-width only) ------------------------- */
@media (max-width: 991.98px) {
  .knv-etl-section {
    padding: 64px 0;
  }
  .knv-etl-hero {
    padding: 130px 0 128px;
  }
  .knv-etl-paper-rail {
    gap: 10px;
    margin-top: -72px;
    margin-bottom: -36px;
  }
  .knv-etl-paper {
    width: 112px;
    min-height: 145px;
  }
  .knv-etl-gallery {
    padding-top: 88px;
  }
  .knv-etl-anatomy__nav {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    margin-bottom: 24px;
  }
  .knv-etl-anatomy__nav-item {
    width: auto;
    flex: 0 0 auto;
  }
}

@media (max-width: 768px) {
  .knv-etl-section {
    padding: 48px 0;
  }
  .knv-etl-section__header {
    margin-bottom: 32px;
  }
  .knv-etl-hero {
    padding: 115px 0px 80px;
  }
  .knv-etl-hero__desc {
    font-size: 16px;
  }
  .knv-etl-paper-rail {
    gap: 8px;
    margin-top: -60px;
    margin-bottom: -28px;
  }
  .knv-etl-paper {
    width: 90px;
    min-height: 120px;
    padding: 10px 8px;
    gap: 5px;
  }
  .knv-etl-gallery {
    padding-top: 72px;
  }
  .knv-etl-quiz__body {
    padding: 20px 20px 12px;
  }
  .knv-etl-quiz__splash {
    padding: 32px 20px;
  }
  .knv-etl-quiz__result-inner {
    padding: 32px 20px;
  }
  .knv-etl-finalcta {
    padding: 56px 0;
  }
}

@media (max-width: 576px) {
  .knv-etl-hero__cta {
    flex-direction: column;
    align-items: stretch;
  }
  .knv-etl-paper-rail {
    gap: 6px;
    margin-top: -52px;
    margin-bottom: -20px;
  }
  .knv-etl-paper {
    width: 76px;
    min-height: 100px;
    padding: 8px 6px;
    gap: 4px;
  }
  .knv-etl-paper--1 { transform: rotate(-3deg); }
  .knv-etl-paper--2 { transform: rotate(2deg); }
  .knv-etl-paper--3 { transform: rotate(-2deg); }
  .knv-etl-paper--4 { transform: rotate(2.5deg); }
  .knv-etl-gallery {
    padding-top: 56px;
  }
  .knv-etl-quiz__option {
    padding: 10px 12px;
    font-size: 14px;
  }
  .knv-etl-grade-tabs {
    gap: 6px;
  }
  .knv-etl-grade-tab {
    padding: 8px 16px;
    font-size: 14px;
  }
}

@media (max-width: 350px) {
  .knv-etl-hero__title {
    font-size: 28px;
  }
  .knv-etl-paper-rail {
    gap: 4px;
    margin-top: -40px;
  }
  .knv-etl-paper {
    width: 60px;
    min-height: 82px;
  }
}