/* ============================================================
   DESIGN SYSTEM — SkillUp Vietnam
   Mobile-first | CSS Variables | Component Classes
   ============================================================ */

/* ── 1. RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }

/* ── FIX A11Y-1: Liên kết bỏ qua điều hướng (Skip link) ── */
.skip-link {
  position: absolute;
  top: -9999px;
  left: -9999px;
  z-index: 9999;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-weight: var(--fw-semi);
  text-decoration: none;
}
.skip-link:focus {
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* ── FIX A11Y-2: Vòng chỉ báo tiêu điểm (Focus indicator) ── */
/* Hiện rõ khi người dùng điều hướng bằng bàn phím */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
/* Ẩn viền khi click chuột bình thường — không làm xấu giao diện */
:focus:not(:focus-visible) {
  outline: none;
}

/* Trạng thái đang được chọn cho các chip/nút toggle (aria-pressed) */
[aria-pressed="true"] {
  border-color: var(--color-primary) !important;
  color: var(--color-primary) !important;
  background: #FFF5EE !important;
}

/* Trạng thái đang được chọn cho quiz options (aria-checked) */
[aria-checked="true"] {
  border-color: var(--color-accent) !important;
  background: rgba(255,214,10,.1) !important;
}

/* ── 2. CSS VARIABLES — LUXURY LIGHT ── */
:root {
  /* ── Màu sắc chính ── */
  --color-primary:    #EA580C;   /* deep warm orange — sang trọng */
  --color-primary-d:  #C2410C;
  --color-primary-lt: #FFF7ED;   /* nền tint cam nhạt */
  --color-secondary:  #111118;   /* near-black — chữ đậm */
  --color-accent:     #EA580C;
  --color-accent-lt:  #FFF7ED;
  --color-success:    #1F9E5A;
  --color-danger:     #C0392B;

  /* ── Nền & bề mặt ── */
  --color-bg:         #FAFAF6;   /* ivory white — nền toàn trang */
  --color-bg-soft:    #FEF3E8;   /* warm cream — section xen kẽ */
  --color-bg-alt:     #FFFFFF;   /* white thuần — card, form */
  --color-bg-dark:    #1A1816;   /* charcoal — footer */

  /* ── Chữ ── */
  --color-heading:    #0D0D0D;
  --color-text:       #1C1916;
  --color-body:       #3C3530;
  --color-muted:      #7A6E64;
  --color-text-muted: #7A6E64;

  /* ── Đường viền ── */
  --color-border:     #FDDCB5;
  --color-border-lt:  #FEE9CC;

  /* ── Sao đánh giá ── */
  --color-star:       #F59E0B;

  /* Typography */
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semi:   600;
  --fw-bold:   700;
  --fw-black:  900;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Layout */
  --max-width:      1200px;
  --container-pad:  var(--space-4);
  --radius-sm:      0.375rem;
  --radius-md:      0.5rem;
  --radius-lg:      0.875rem;
  --radius-xl:      1.25rem;
  --radius-pill:    9999px;
  --radius-full:    9999px;

  /* Shadows — warm gold-tinted */
  --shadow-sm: 0 1px 4px rgba(234,88,12,.07);
  --shadow-md: 0 4px 16px rgba(234,88,12,.10);
  --shadow-lg: 0 10px 32px rgba(234,88,12,.14);
  --shadow-xl: 0 20px 48px rgba(234,88,12,.16);

  /* Transition */
  --ease: 0.2s ease;
}

/* ── 3. LAYOUT ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}
.section { padding-block: var(--space-10); }
.section--lg { padding-block: var(--space-16); }

/* ── 4. TYPOGRAPHY ── */
h1 { font-size: clamp(var(--text-2xl), 5vw, var(--text-4xl)); font-weight: var(--fw-bold); line-height: 1.2; }
h2 { font-size: clamp(var(--text-xl), 4vw, var(--text-3xl)); font-weight: var(--fw-bold); line-height: 1.3; }
h3 { font-size: var(--text-xl); font-weight: var(--fw-semi); }
h4 { font-size: var(--text-lg); font-weight: var(--fw-semi); }
p  { font-size: var(--text-base); line-height: 1.65; }
.text-muted { color: var(--color-text-muted); }
.text-sm    { font-size: var(--text-sm); }
.text-xs    { font-size: var(--text-xs); }
.text-center { text-align: center; }
.highlight  { color: var(--color-primary); }

/* ── 5. BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.625rem;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: var(--fw-semi);
  letter-spacing: 0.01em;
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease), border-color var(--ease);
  white-space: nowrap;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  border: 2px solid transparent;
}
.btn:active { transform: scale(0.97); }

/* Deep warm orange — CTA chính */
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn--primary:hover {
  background: var(--color-primary-d);
  border-color: var(--color-primary-d);
  box-shadow: 0 6px 20px rgba(234,88,12,.30);
}

/* Luxury gold — accent CTA */
.btn--accent {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn--accent:hover {
  background: #9A7808;
  border-color: #9A7808;
  box-shadow: 0 6px 20px rgba(184,146,10,.30);
}

/* Charcoal — secondary solid */
.btn--secondary {
  background: var(--color-secondary);
  color: #fff;
  border-color: var(--color-secondary);
}
.btn--secondary:hover { background: #2A2A30; border-color: #2A2A30; }

/* Outline orange */
.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--outline:hover { background: var(--color-primary); color: #fff; box-shadow: 0 4px 14px rgba(234,88,12,.22); }

/* Outline dark — elegant on light bg */
.btn--outline-dark {
  background: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}
.btn--outline-dark:hover { background: var(--color-secondary); color: #fff; }

/* Ghost */
.btn--ghost {
  background: transparent;
  color: var(--color-muted);
  border-color: transparent;
}
.btn--ghost:hover { color: var(--color-primary); background: var(--color-primary-lt); }

.btn--lg   { padding: 1rem 2.25rem; font-size: var(--text-lg); border-radius: var(--radius-lg); }
.btn--sm   { padding: 0.45rem 1rem; font-size: var(--text-sm); }
.btn--full { width: 100%; }
.btn--pill { border-radius: var(--radius-pill); }

/* CTA pulse */
.btn--pulse { animation: pulse 2.2s infinite; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(234,88,12,.35); }
  50%       { box-shadow: 0 0 0 12px rgba(234,88,12,0); }
}

/* ── 6. BADGE & TAGS ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--fw-semi);
}
.badge--hot      { background: #FEE2E2; color: #DC2626; }
.badge--new      { background: #DCFCE7; color: #16A34A; }
.badge--sale     { background: var(--color-primary); color: #fff; }
.badge--free     { background: var(--color-accent); color: var(--color-secondary); }
.badge--popular  { background: #EDE9FE; color: #7C3AED; }

/* ── 7. COURSE CARD ── */
.card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.28s ease, transform 0.28s ease;
  border: 1px solid var(--color-border-lt);
}
.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
  border-color: var(--color-border);
}

.card__thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-bg-soft);
}
.card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.card:hover .card__thumb img { transform: scale(1.04); }

.card__badge {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
}

.card__body { padding: var(--space-4); }
.card__title {
  font-size: var(--text-base);
  font-weight: var(--fw-semi);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-2);
}
.card__instructor { font-size: var(--text-xs); color: var(--color-text-muted); margin-bottom: var(--space-2); }

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
}
.card__rating {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--fw-semi);
}
.card__stars { color: var(--color-star); font-size: var(--text-sm); }
.card__students { font-size: var(--text-xs); color: var(--color-text-muted); }

/* Progress bar inside card */
.card__progress { margin-bottom: var(--space-3); }
.card__progress-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}
.progress-bar {
  height: 4px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  background: var(--color-success);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}
.card__price { display: flex; align-items: center; gap: var(--space-2); }
.price--sale { font-size: var(--text-lg); font-weight: var(--fw-bold); color: var(--color-primary); }
.price--original { font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: line-through; }

/* ── 8. GRID ── */
.grid-courses {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}
@media (min-width: 768px)  { .grid-courses { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .grid-courses { grid-template-columns: repeat(4, 1fr); } }

/* ── 9. CATEGORY SCROLL ── */
.categories-scroll {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scroll-snap-type: x mandatory;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.categories-scroll::-webkit-scrollbar { display: none; }

.category-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-alt);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  white-space: nowrap;
  scroll-snap-align: start;
  transition: border-color var(--ease), color var(--ease), background var(--ease), box-shadow var(--ease);
  cursor: pointer;
  color: var(--color-body);
}
.category-chip:hover,
.category-chip.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-lt);
  box-shadow: 0 2px 8px rgba(234,88,12,.12);
}
.category-chip .icon { font-size: 1.1rem; }

/* ── 10. STAR RATING ── */
.stars {
  display: inline-flex;
  gap: 1px;
  color: var(--color-star);
  font-size: var(--text-sm);
}

/* ── 11. NAVBAR ── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253,250,246,.96);
  border-bottom: 1px solid var(--color-border-lt);
  box-shadow: 0 1px 12px rgba(234,88,12,.07);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.navbar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 64px;
}
.navbar__logo {
  font-size: var(--text-xl);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  flex-shrink: 0;
  letter-spacing: -0.01em;
}
.navbar__search {
  flex: 1;
  display: flex;
  align-items: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0 var(--space-4);
  gap: var(--space-2);
  max-width: 480px;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.navbar__search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(234,88,12,.10);
}
.navbar__search input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.625rem 0;
  font-size: var(--text-sm);
  font-family: inherit;
  outline: none;
  color: var(--color-text);
}
.navbar__search input::placeholder { color: var(--color-muted); }
.navbar__search-icon { color: var(--color-muted); flex-shrink: 0; }

.navbar__actions { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; }
.navbar__actions .btn { padding: 0.45rem 1.1rem; font-size: var(--text-sm); }

/* ── 12. HERO — LUXURY LIGHT ── */
.hero {
  background: linear-gradient(150deg, #FDFAF4 0%, #F6EDD8 55%, #F0E4C8 100%);
  color: var(--color-heading);
  padding: var(--space-16) 0 calc(var(--space-16) + 20px);
  overflow: hidden;
  position: relative;
}
/* Decorative gold orb top-right */
.hero::before {
  content: '';
  position: absolute;
  top: -120px; right: -120px;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184,146,10,.12) 0%, transparent 70%);
  pointer-events: none;
}
/* Bottom wave clip into next section */
.hero::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 48px;
  background: var(--color-bg);
  clip-path: ellipse(55% 100% at 50% 100%);
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(184,146,10,.10);
  color: var(--color-accent);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--fw-semi);
  margin-bottom: var(--space-4);
  border: 1px solid rgba(184,146,10,.25);
  letter-spacing: 0.04em;
}
.hero__headline {
  margin-bottom: var(--space-4);
  color: var(--color-heading);
}
.hero__headline .highlight {
  color: var(--color-primary);
  position: relative;
}
/* Underline accent dưới highlight */
.hero__headline .highlight::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
  border-radius: 2px;
}
.hero__sub {
  font-size: var(--text-lg);
  color: var(--color-body);
  margin-bottom: var(--space-6);
  max-width: 520px;
  line-height: 1.7;
}
.hero__search {
  display: flex;
  background: #fff;
  border-radius: var(--radius-xl);
  overflow: hidden;
  max-width: 540px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}
.hero__search input {
  flex: 1;
  padding: var(--space-4) var(--space-5);
  border: none;
  font-size: var(--text-base);
  font-family: inherit;
  outline: none;
  color: var(--color-text);
  background: transparent;
}
.hero__search button {
  padding: var(--space-4) var(--space-6);
  background: var(--color-primary);
  color: #fff;
  font-weight: var(--fw-semi);
  font-size: var(--text-base);
  font-family: inherit;
  transition: background var(--ease);
  white-space: nowrap;
}
.hero__search button:hover { background: var(--color-primary-d); }
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-top: var(--space-8);
}
.hero__stat-num {
  font-size: var(--text-2xl);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
}
.hero__stat-label {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: 2px;
}

/* ── 13. SECTION HEADER ── */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.section-header__eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--fw-semi);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
}
.section-header h2 { margin-bottom: 0; }

/* ── 14. SOCIAL PROOF TICKER ── */
.social-ticker {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-secondary);
}
.social-ticker__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  animation: blink 1.5s infinite;
  flex-shrink: 0;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: .3; }
}

/* ── 15. COUNTDOWN TIMER ── */
.countdown {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--fw-semi);
  color: var(--color-danger);
}
.countdown__block {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #FEE2E2;
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.5rem;
  min-width: 2.2rem;
}
.countdown__num { font-size: var(--text-lg); font-weight: var(--fw-bold); line-height: 1; }
.countdown__label { font-size: 0.6rem; text-transform: uppercase; color: var(--color-text-muted); }
.countdown__sep { font-weight: var(--fw-bold); }

/* ── 16. TRUST BAR ── */
.trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-border-lt);
  border-bottom: 1px solid var(--color-border-lt);
  background: var(--color-bg-alt);
}
.trust-bar__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-muted);
  font-weight: var(--fw-medium);
}
.trust-bar__icon { font-size: 1.2rem; }

/* ── 17. ACCORDION ── */
.accordion { border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; }
.accordion__item { border-bottom: 1px solid var(--color-border); }
.accordion__item:last-child { border-bottom: none; }
.accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: #fff;
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  text-align: left;
  cursor: pointer;
  transition: background var(--ease);
  font-family: inherit;
  color: var(--color-text);
}
.accordion__trigger:hover { background: var(--color-bg-soft); }
.accordion__trigger.active { background: var(--color-bg-soft); color: var(--color-primary); }
.accordion__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  transition: transform var(--ease);
  color: var(--color-text-muted);
}
.accordion__trigger.active .accordion__icon { transform: rotate(180deg); color: var(--color-primary); }
.accordion__body {
  display: none;
  padding: 0 var(--space-5) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  background: var(--color-bg-soft);
}
.accordion__body.open { display: block; }
.accordion__lesson-list { margin-top: var(--space-3); }
.accordion__lesson {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}
.accordion__lesson:last-child { border-bottom: none; }
.lesson-icon { color: var(--color-primary); flex-shrink: 0; }
.lesson-duration { margin-left: auto; color: var(--color-text-muted); font-size: var(--text-xs); }
.lesson-free { color: var(--color-success); font-size: var(--text-xs); font-weight: var(--fw-semi); }

/* ── 18. CHECKOUT SPECIFIC ── */
.checkout-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 900px) {
  .checkout-layout { grid-template-columns: 1fr 380px; }
}

.checkout-section {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
}
.checkout-section h3 { margin-bottom: var(--space-5); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-border); }

/* Payment method selector */
.payment-methods { display: flex; flex-direction: column; gap: var(--space-3); }
.payment-option {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--ease), background var(--ease);
}
.payment-option:hover { border-color: var(--color-primary); background: var(--color-primary-lt); }
.payment-option.selected { border-color: var(--color-primary); background: var(--color-primary-lt); }
.payment-option input[type="radio"] { accent-color: var(--color-primary); width: 18px; height: 18px; }
.payment-option__logo { height: 28px; object-fit: contain; }
.payment-option__label { font-weight: var(--fw-medium); }
.payment-option__desc { font-size: var(--text-xs); color: var(--color-text-muted); }

/* Order summary */
.order-summary { background: var(--color-bg-soft); border-radius: var(--radius-lg); padding: var(--space-5); }
.order-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
}
.order-row--total {
  border-top: 2px solid var(--color-border);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  font-weight: var(--fw-bold);
  font-size: var(--text-lg);
}
.order-row--saving { color: var(--color-success); font-weight: var(--fw-semi); }

/* Order bump */
.order-bump {
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  background: var(--color-primary-lt);
  margin-block: var(--space-5);
}
.order-bump__header { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.order-bump__checkbox { accent-color: var(--color-primary); width: 20px; height: 20px; cursor: pointer; }
.order-bump__label { font-weight: var(--fw-semi); cursor: pointer; line-height: 1.4; }
.order-bump__discount { color: var(--color-primary); font-weight: var(--fw-bold); }

/* Form inputs */
.form-group { margin-bottom: var(--space-4); }
.form-label { display: block; font-size: var(--text-sm); font-weight: var(--fw-medium); margin-bottom: var(--space-2); }
.form-input {
  width: 100%;
  padding: 0.75rem var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: inherit;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--ease), box-shadow var(--ease);
  outline: none;
}
.form-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(234,88,12,.12); }
.form-input::placeholder { color: var(--color-text-muted); }

/* ── 19. COURSE DETAIL ── */
.course-hero {
  background: linear-gradient(150deg, #FDFAF4 0%, #F3EAD5 60%, #EDE0C4 100%);
  color: var(--color-heading);
  padding: var(--space-12) 0 var(--space-16);
  position: relative;
  overflow: hidden;
}
.course-hero::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 360px; height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(234,88,12,.10) 0%, transparent 70%);
  pointer-events: none;
}
.course-hero h1 { color: var(--color-heading); max-width: 680px; }
.course-hero__meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); margin-top: var(--space-4); font-size: var(--text-sm); }
.course-hero__rating { display: flex; align-items: center; gap: var(--space-2); color: var(--color-accent); font-weight: var(--fw-semi); }

.course-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  position: relative;
}
@media (min-width: 1024px) {
  .course-layout { grid-template-columns: 1fr 360px; }
}

/* Sticky sidebar */
.sidebar {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
@media (min-width: 1024px) {
  .sidebar--sticky { position: sticky; top: 80px; }
}
.sidebar__video { aspect-ratio: 16/9; position: relative; background: #000; }
.sidebar__video video, .sidebar__video iframe { width: 100%; height: 100%; object-fit: cover; }
.sidebar__play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.3);
  cursor: pointer;
  transition: background var(--ease);
}
.sidebar__play-overlay:hover { background: rgba(0,0,0,.45); }
.sidebar__play-btn {
  width: 60px;
  height: 60px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-lg);
  transition: transform var(--ease);
}
.sidebar__play-overlay:hover .sidebar__play-btn { transform: scale(1.1); }

.sidebar__body { padding: var(--space-5); }
.sidebar__price { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-4); }
.sidebar__price-sale { font-size: var(--text-3xl); font-weight: var(--fw-bold); color: var(--color-secondary); }
.sidebar__price-original { font-size: var(--text-lg); text-decoration: line-through; color: var(--color-text-muted); }
.sidebar__price-save { background: var(--color-primary); color: #fff; padding: 0.2rem 0.6rem; border-radius: var(--radius-full); font-size: var(--text-xs); font-weight: var(--fw-bold); }

.sidebar__cta { margin-bottom: var(--space-4); }
.sidebar__guarantee {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-3);
  background: #F0FDF4;
  border-radius: var(--radius-md);
  border: 1px solid #BBF7D0;
}
.sidebar__guarantee-icon { color: var(--color-success); font-size: 1.4rem; flex-shrink: 0; }

/* Mobile sticky bar */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: #fff;
  border-top: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  box-shadow: 0 -4px 20px rgba(0,0,0,.1);
}
@media (max-width: 1023px) {
  .mobile-sticky-bar { display: flex; align-items: center; gap: var(--space-3); }
}
.mobile-sticky-bar__price { flex: 1; }
.mobile-sticky-bar__price .price--sale { font-size: var(--text-xl); }

/* ── 20. INSTRUCTOR ── */
.instructor {
  display: flex;
  gap: var(--space-5);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-border);
}
.instructor__avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--color-primary);
}
.instructor__name { font-size: var(--text-xl); font-weight: var(--fw-bold); margin-bottom: var(--space-1); }
.instructor__title { color: var(--color-primary); font-size: var(--text-sm); margin-bottom: var(--space-3); }
.instructor__stats { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-bottom: var(--space-3); }
.instructor__stat { text-align: center; }
.instructor__stat-num { font-weight: var(--fw-bold); font-size: var(--text-lg); display: block; }
.instructor__stat-label { font-size: var(--text-xs); color: var(--color-text-muted); }

/* ── 21. FAQ ── */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: #fff;
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: var(--color-text);
  transition: background var(--ease);
}
.faq-question:hover { background: var(--color-bg-soft); }
.faq-question.active { color: var(--color-primary); }
.faq-icon { flex-shrink: 0; transition: transform var(--ease); color: var(--color-text-muted); }
.faq-question.active .faq-icon { transform: rotate(45deg); color: var(--color-primary); }
.faq-answer {
  display: none;
  padding: var(--space-1) var(--space-5) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.75;
  background: var(--color-bg-soft);
}
.faq-answer.open { display: block; }

/* ── 22. FOOTER ── */
.footer {
  background: var(--color-secondary);
  color: rgba(255,255,255,.8);
  padding: var(--space-16) 0 var(--space-8);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
@media (min-width: 640px) { .footer__grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer__logo { font-size: var(--text-2xl); font-weight: var(--fw-bold); color: #fff; margin-bottom: var(--space-3); }
.footer__desc { font-size: var(--text-sm); line-height: 1.7; }
.footer__heading { font-size: var(--text-sm); font-weight: var(--fw-semi); color: #fff; margin-bottom: var(--space-4); text-transform: uppercase; letter-spacing: 0.08em; }
.footer__links { display: flex; flex-direction: column; gap: var(--space-2); }
.footer__links a { font-size: var(--text-sm); transition: color var(--ease); }
.footer__links a:hover { color: var(--color-primary); }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
}

/* ── 23. NOTIFICATION TOAST ── */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-secondary);
  color: #fff;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  box-shadow: var(--shadow-lg);
  transition: transform 0.35s cubic-bezier(.34,1.56,.64,1);
  z-index: 9999;
  white-space: nowrap;
  pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }
@media (max-width: 1023px) { .toast { bottom: 90px; } }

/* ── 24. QUIZ WIDGET ── */
.quiz-widget {
  background: linear-gradient(135deg, var(--color-secondary), #16213E);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  color: #fff;
  text-align: center;
}
.quiz-widget h3 { color: #fff; margin-bottom: var(--space-6); font-size: var(--text-2xl); }
.quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
@media (min-width: 640px) { .quiz-options { grid-template-columns: repeat(4, 1fr); } }
.quiz-option {
  background: rgba(255,255,255,.08);
  border: 2px solid rgba(255,255,255,.2);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  cursor: pointer;
  transition: border-color var(--ease), background var(--ease);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: #fff;
}
.quiz-option:hover,
.quiz-option.selected {
  border-color: var(--color-accent);
  background: rgba(255,214,10,.1);
}
.quiz-option .option-icon { font-size: 2rem; margin-bottom: var(--space-2); display: block; }

/* ── 25. LOGO CLOUD ── */
.logo-cloud {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-6);
  opacity: 0.5;
  filter: grayscale(1);
  transition: opacity var(--ease);
}
.logo-cloud:hover { opacity: 0.7; }
.logo-cloud img { height: 28px; object-fit: contain; }

/* ── 26. SKELETON LOADER ── */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: var(--radius-md);
}
@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── 27. UTILITY ── */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col     { display: flex; flex-direction: column; }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.mt-4   { margin-top: var(--space-4); }
.mt-6   { margin-top: var(--space-6); }
.mb-4   { margin-bottom: var(--space-4); }
.mb-6   { margin-bottom: var(--space-6); }
.fw-bold { font-weight: var(--fw-bold); }
.d-none { display: none !important; }
@media (min-width: 768px) { .d-md-flex { display: flex !important; } .d-md-none { display: none !important; } }
@media (min-width: 1024px) { .d-lg-flex { display: flex !important; } .d-lg-none { display: none !important; } }

/* ── 28. ABOUT PAGE ── */

/* Hero — luxury ivory */
.hero-about {
  background: linear-gradient(150deg, #FDFAF4 0%, #F3EAD5 55%, #EDE0C4 100%);
  color: var(--color-heading);
  padding: 3rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero-about::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 420px; height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184,146,10,.12) 0%, transparent 70%);
  pointer-events: none;
}
.about-hero-grid { display:grid; grid-template-columns:1fr; gap:2rem; align-items:center; }
@media (min-width:768px) { .about-hero-grid { grid-template-columns:220px 1fr; gap:3rem; } }

.about-avatar-wrap { position:relative; display:flex; justify-content:center; }
.about-avatar-ring { width:180px; height:180px; border-radius:50%; padding:4px; background:linear-gradient(135deg,var(--color-accent),var(--color-primary)); margin:0 auto; box-shadow: var(--shadow-lg); }
.about-avatar { width:100%; height:100%; border-radius:50%; object-fit:cover; border:3px solid var(--color-bg); }
.about-avatar-badge { position:absolute; bottom:0; right:calc(50% - 90px); background:var(--color-accent); color:#fff; font-size:.8rem; font-weight:var(--fw-bold); padding:.25rem .6rem; border-radius:var(--radius-pill); border:2px solid var(--color-bg); box-shadow:var(--shadow-sm); }
@media (min-width:768px) { .about-avatar-ring { width:200px; height:200px; } .about-avatar-badge { right:-8px; } }

.about-tag { font-size:.8rem; font-weight:var(--fw-semi); letter-spacing:.08em; text-transform:uppercase; color:var(--color-accent); margin-bottom:.5rem; }
.about-name { font-size:clamp(1.8rem,5vw,2.8rem); font-weight:var(--fw-black); line-height:1.1; margin-bottom:.5rem; color:var(--color-heading); }
.about-subtitle { font-size:1.1rem; color:var(--color-body); margin-bottom:1.5rem; }

.about-stats-row { display:grid; grid-template-columns:repeat(4,1fr); gap:1rem; margin-bottom:1.75rem; }
@media (max-width:480px) { .about-stats-row { grid-template-columns:repeat(2,1fr); } }
.about-stat { text-align:center; }
.about-stat__num { display:block; font-size:1.6rem; font-weight:var(--fw-black); color:var(--color-primary); line-height:1; }
.about-stat__label { font-size:.75rem; color:var(--color-muted); margin-top:.2rem; }

.about-hero-cta { display:flex; flex-wrap:wrap; gap:.75rem; }
.about-ghost-light { color:var(--color-body); border-color:var(--color-border); }
.about-ghost-light:hover { background:var(--color-bg-soft); border-color:var(--color-primary); color:var(--color-primary); }

/* Trust bar */
.trust-bar-about { background:#fff; border-bottom:1px solid var(--color-border); padding:1rem 0; }
.trust-bar-about .container { display:flex; align-items:center; gap:1.5rem; flex-wrap:wrap; }
.trust-bar-about__label { font-size:.8rem; color:var(--color-muted); white-space:nowrap; }
.trust-logos { display:flex; gap:1.5rem; flex-wrap:wrap; }
.trust-logo-item { font-size:.85rem; font-weight:var(--fw-semi); color:var(--color-muted); opacity:.6; }

/* Story section */
.about-story-grid { display:grid; grid-template-columns:1fr; gap:3rem; }
@media (min-width:900px) { .about-story-grid { grid-template-columns:1fr 400px; } }

.about-story__title { font-size:clamp(1.3rem,3vw,1.8rem); font-weight:var(--fw-bold); line-height:1.3; margin:1rem 0 1.25rem; }
.about-story__text { color:var(--color-body); line-height:1.75; margin-bottom:1rem; }
.about-quote { background:var(--color-bg-alt); border-left:4px solid var(--color-accent); padding:1.25rem 1.5rem; border-radius:0 var(--radius-md) var(--radius-md) 0; margin-top:1.5rem; }
.about-quote p { font-size:1.05rem; font-style:italic; color:var(--color-heading); line-height:1.6; margin-bottom:.75rem; }
.about-quote footer { font-size:.85rem; font-weight:var(--fw-semi); color:var(--color-muted); }

/* Timeline */
.timeline { position:relative; padding-left:1.75rem; }
.timeline::before { content:''; position:absolute; left:.5rem; top:.5rem; bottom:.5rem; width:2px; background:var(--color-border); }
.timeline-item { position:relative; margin-bottom:1.5rem; }
.timeline-dot { position:absolute; left:-1.25rem; top:.3rem; width:12px; height:12px; border-radius:50%; background:var(--color-border); border:2px solid #fff; }
.timeline-item--active .timeline-dot { background:var(--color-primary); border-color:var(--color-primary); }
.timeline-year { display:inline-block; font-size:.8rem; font-weight:var(--fw-bold); color:var(--color-primary); background:var(--color-primary-lt); padding:.15rem .5rem; border-radius:var(--radius-sm); margin-bottom:.35rem; }
.timeline-content p { font-size:.9rem; color:var(--color-body); line-height:1.6; }

/* Courses grid */
.about-courses-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:1.25rem; }
@media (min-width:900px) { .about-courses-grid { grid-template-columns:repeat(4,1fr); } }
@media (max-width:480px) { .about-courses-grid { grid-template-columns:1fr; } }
.about-course-card { position:relative; }
.course-card__link { position:absolute; inset:0; opacity:0; }
.about-courses-footer { text-align:center; margin-top:2rem; }

/* Testimonials */
.testimonials-grid { display:grid; grid-template-columns:1fr; gap:1.25rem; margin-bottom:3rem; }
@media (min-width:640px) { .testimonials-grid { grid-template-columns:repeat(3,1fr); } }
.testimonial-card { background:#fff; border:1px solid var(--color-border); border-radius:var(--radius-lg); padding:1.5rem; box-shadow:var(--shadow-sm); display:flex; flex-direction:column; gap:1rem; }
.testimonial-card__stars { color:var(--color-star); font-size:1rem; letter-spacing:.05em; }
.testimonial-card__text { font-size:.95rem; line-height:1.65; color:var(--color-body); flex:1; }
.testimonial-card__author { display:flex; align-items:center; gap:.75rem; }
.testimonial-card__avatar { width:40px; height:40px; border-radius:50%; object-fit:cover; flex-shrink:0; }
.testimonial-card__author strong { display:block; font-size:.9rem; color:var(--color-heading); }
.testimonial-card__author span { font-size:.8rem; color:var(--color-muted); }

/* Rating summary */
.about-rating-summary { display:flex; align-items:center; gap:2.5rem; flex-wrap:wrap; background:var(--color-bg-alt); border-radius:var(--radius-lg); padding:1.75rem 2rem; }
.about-rating-big { font-size:4rem; font-weight:var(--fw-black); color:var(--color-primary); line-height:1; }
.about-rating-details { flex:1; min-width:200px; }
.about-rating-stars { color:var(--color-star); font-size:1.1rem; letter-spacing:.05em; margin-bottom:.4rem; }
.about-rating-details p { font-size:.9rem; color:var(--color-body); margin-bottom:.75rem; }
.about-rating-bars { display:flex; flex-direction:column; gap:.4rem; }
.rating-bar-row { display:flex; align-items:center; gap:.6rem; font-size:.8rem; color:var(--color-muted); }
.rating-bar { flex:1; height:8px; background:var(--color-border); border-radius:var(--radius-pill); overflow:hidden; }
.rating-bar__fill { height:100%; background:var(--color-accent); border-radius:var(--radius-pill); }

/* FAQ about */
.about-faq-wrap { max-width:740px; margin:0 auto; }

/* CTA section — luxury ivory với border gold */
.about-cta { background: var(--color-bg-soft); }
.about-cta-box {
  position: relative; overflow: hidden;
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xl);
}
@media (min-width:768px) { .about-cta-box { padding:4rem 3rem; } }
.about-cta__title { font-size:clamp(1.3rem,3vw,2rem); font-weight:var(--fw-bold); color:var(--color-heading); line-height:1.3; margin-bottom:.75rem; }
.about-cta__sub { color:var(--color-body); margin-bottom:1.75rem; }
.about-cta-btns { display:flex; flex-wrap:wrap; gap:.75rem; margin-bottom:1.25rem; }
.about-ghost-cta { color:var(--color-body); border-color:var(--color-border); }
.about-ghost-cta:hover { background:var(--color-bg-soft); border-color:var(--color-primary); color:var(--color-primary); }
.about-cta__guarantee { font-size:.82rem; color:var(--color-muted); display:flex; align-items:center; gap:.4rem; }
.about-cta__guarantee svg { flex-shrink:0; stroke:var(--color-muted); }

.about-cta-decoration { position:absolute; inset:0; pointer-events:none; }
.cta-deco-circle { position:absolute; border-radius:50%; }
.cta-deco-circle--1 { width:320px; height:320px; right:-80px; top:-80px; background:radial-gradient(circle, rgba(184,146,10,.08) 0%, transparent 70%); }
.cta-deco-circle--2 { width:220px; height:220px; left:-60px; bottom:-60px; background:radial-gradient(circle, rgba(234,88,12,.07) 0%, transparent 70%); }

/* Dot grid — light luxury version */
.hero-dots { position:absolute; inset:0; pointer-events:none; opacity:.35; background-image:radial-gradient(circle, rgba(234,88,12,.18) 1px, transparent 1px); background-size:30px 30px; }

/* ── 29. RESPONSIVE ADJUSTMENTS ── */
@media (max-width: 767px) {
  :root { --container-pad: var(--space-4); }
  .section { padding-block: var(--space-8); }
  .section-header { flex-direction: column; align-items: flex-start; }
  .instructor { flex-direction: column; }
  .instructor__avatar { width: 64px; height: 64px; }
  .hero { padding: var(--space-8) 0 var(--space-10); }
  .hero__stats { gap: var(--space-4); }
  .sidebar { border-radius: 0; border-left: none; border-right: none; }
}