@charset "UTF-8";

/* ==========================================================================
   Hero Grid - Multi-Subject Homepage Layout
   Two labelled groups that always fill complete rows:
   - Âm nhạc hiện đại (6): 3 columns x 3 rows, Piano is a 2x2 feature.
   - Nhạc cụ dân tộc (5): 3 columns x 2 rows, Đàn tranh is a 1x2 feature.
   Tablet: 2 columns, wide feature / pairs (Drum closes the first group).
   Small phones: 1 column.
   Each card sets its accent via --accent / --accent-2 / --accent-ink / --tint.
   ========================================================================== */

/* Tokens are scoped to the homepage block (no :root side effects) */
.hero-grid {
  --grid-bg: #0b0b0f;
  --grid-line: rgba(255, 255, 255, 0.08);
  --grid-line-strong: rgba(255, 255, 255, 0.16);
  --grid-text: #ffffff;
  --grid-text-muted: rgba(255, 255, 255, 0.72);
  --grid-text-faint: rgba(255, 255, 255, 0.5);
  --grid-radius: 22px;
  --grid-gap: 18px;
  --grid-max: 1360px;
  --grid-row: 320px;
  --grid-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --grid-transition: 0.5s var(--grid-ease);
  /* Reserved space above card copy so the icon/logo never overlaps text */
  --card-pad: 1.5rem;
  --card-icon-zone: 5.75rem;
  --feature-pad: 2.25rem;
  --feature-icon-zone: 7.25rem;
}

/* Per-subject accents */
.hero-grid__card--piano     { --accent: #b9a2ff; --accent-2: #7c3aed; --accent-ink: #ffffff; --tint: 109, 40, 217; }
.hero-grid__card--vocal     { --accent: #f9a8d4; --accent-2: #db2777; --accent-ink: #ffffff; --tint: 190, 24, 93; }
.hero-grid__card--acoustic  { --accent: #e7b98a; --accent-2: #a16207; --accent-ink: #1c1406; --tint: 161, 98, 7; }
.hero-grid__card--electric  { --accent: #fca5a5; --accent-2: #dc2626; --accent-ink: #ffffff; --tint: 185, 28, 28; }
.hero-grid__card--ukulele   { --accent: #edc77f; --accent-2: #b8862e; --accent-ink: #1c1406; --tint: 15, 118, 110; }
.hero-grid__card--drum      { --accent: #b5e7d9; --accent-2: #77b7aa; --accent-ink: #153542; --tint: 73, 133, 124; }
.hero-grid__card--dantranh  { --accent: #6ee7b7; --accent-2: #059669; --accent-ink: #052e1f; --tint: 4, 120, 87; }
.hero-grid__card--dantyba   { --accent: #fcd34d; --accent-2: #d97706; --accent-ink: #1c1406; --tint: 180, 83, 9; }
.hero-grid__card--danbau    { --accent: #93c5fd; --accent-2: #2563eb; --accent-ink: #ffffff; --tint: 29, 78, 216; }
.hero-grid__card--dannguyet { --accent: #fbb6ce; --accent-2: #be185d; --accent-ink: #ffffff; --tint: 157, 23, 77; }
.hero-grid__card--saotruc   { --accent: #bef264; --accent-2: #65a30d; --accent-ink: #1a2e05; --tint: 77, 124, 15; }

/* Card photos not set inline in the view */
.hero-grid__card--piano .hero-grid__card-bg {
  background-image: url('https://images.unsplash.com/photo-1552422535-c45813c61732?w=1400&auto=format&fit=crop&q=80');
}

.hero-grid__card--vocal .hero-grid__card-bg {
  background-image: url('https://images.unsplash.com/photo-1516280440614-37939bbacd81?w=900&auto=format&fit=crop&q=80');
}

.hero-grid__card--acoustic .hero-grid__card-bg {
  background-image: url('https://images.unsplash.com/photo-1510915361894-db8b60106cb1?w=900&auto=format&fit=crop&q=80');
}

.hero-grid__card--electric .hero-grid__card-bg {
  background-image: url('https://images.unsplash.com/photo-1516924962500-2b4b3b99ea02?w=900&auto=format&fit=crop&q=80');
}

.hero-grid__card--danbau .hero-grid__card-bg {
  background-position: center 40%;
}

.hero-grid__card--saotruc .hero-grid__card-bg {
  background-position: 60% 30%;
}

/* Main Container */
.hero-grid {
  min-height: 100vh;
  min-height: 100dvh;
  background-color: var(--grid-bg);
  background-image:
    radial-gradient(60% 40% at 15% 0%, rgba(124, 58, 237, 0.14) 0%, transparent 70%),
    radial-gradient(50% 35% at 90% 55%, rgba(5, 150, 105, 0.1) 0%, transparent 70%),
    radial-gradient(45% 30% at 10% 100%, rgba(219, 39, 119, 0.08) 0%, transparent 70%);
  padding: 48px 1.5rem 4rem;
  position: relative;
  overflow: hidden;
  font-family: 'Be Vietnam Pro', system-ui, sans-serif;
}

/* Compact page intro (visible H1) */
.hero-grid__intro {
  max-width: var(--grid-max);
  margin: 0 auto 2.25rem;
  position: relative;
  z-index: 1;
}

.hero-grid__heading {
  margin: 0 0 0.5rem;
  font-family: 'Be Vietnam Pro', system-ui, sans-serif;
  font-size: clamp(1.5rem, 1.05rem + 1.5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--grid-text);
  text-wrap: balance;
}

.hero-grid__heading-sub {
  font-weight: 600;
  color: var(--grid-text-muted);
}

.hero-grid__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(0.95rem, 0.9rem + 0.2vw, 1.05rem);
  line-height: 1.55;
  color: var(--grid-text-muted);
}

/* Course groups */
.hero-grid__group {
  max-width: var(--grid-max);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-grid__group + .hero-grid__group {
  margin-top: 3rem;
}

.hero-grid__group--modern      { --group-accent: #b9a2ff; }
.hero-grid__group--traditional { --group-accent: #6ee7b7; }

.hero-grid__group-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.1rem;
  font-family: 'Be Vietnam Pro', system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grid-text);
}

.hero-grid__group-title::before {
  content: '';
  flex: none;
  width: 24px;
  height: 3px;
  border-radius: 3px;
  background: var(--group-accent);
}

.hero-grid__group-title::after {
  content: '';
  flex: 1 1 auto;
  height: 1px;
  background: var(--grid-line-strong);
}

/* Grid Container: 3 columns, equal row heights within each group */
.hero-grid__container {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-auto-rows: minmax(var(--grid-row), 1fr);
  gap: var(--grid-gap);
  position: relative;
  z-index: 1;
}

/* Piano: 2x2 at top-left; Thanh nhạc and Guitar Acoustic stack on the right,
   the remaining three fill row 3. Đàn tranh: 1x2 at left, four cards in a 2x2. */
.hero-grid__card--piano {
  grid-column: span 2;
  grid-row: span 2;
}

.hero-grid__card--dantranh {
  grid-row: span 2;
}

/* Individual Cards */
.hero-grid__card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-width: 0;
  padding-top: var(--card-icon-zone);
  border-radius: var(--grid-radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--grid-text);
  background: #16161c;
  box-shadow: 0 0 0 1px var(--grid-line), 0 20px 40px -24px rgba(0, 0, 0, 0.8);
  transition: transform var(--grid-transition), box-shadow var(--grid-transition);
}

.hero-grid__card:hover,
.hero-grid__card:focus-visible {
  color: var(--grid-text);
  transform: translateY(-6px);
  box-shadow:
    0 0 0 1px rgba(var(--tint), 0.9),
    0 30px 60px -20px rgba(var(--tint), 0.55);
}

.hero-grid__card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Card Backgrounds */
.hero-grid__card-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-size: cover;
  background-position: center;
  transform: scale(1.04);
  filter: saturate(0.9);
  transition: transform 1.2s var(--grid-ease), filter 0.6s ease;
}

.hero-grid__card:hover .hero-grid__card-bg {
  transform: scale(1.1);
  filter: saturate(1.1);
}

/* Card Overlays: neutral fade for legibility + a soft subject-coloured wash at the bottom */
.hero-grid__card-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 60% at 0% 100%, rgba(var(--tint), 0.55) 0%, transparent 65%),
    linear-gradient(180deg, rgba(10, 10, 14, 0.25) 0%, rgba(10, 10, 14, 0.15) 30%, rgba(10, 10, 14, 0.78) 62%, rgba(10, 10, 14, 0.96) 100%);
  transition: opacity 0.5s ease;
}

/* Card Icon/Logo: pinned top-left inside the reserved icon zone */
.hero-grid__card-icon {
  position: absolute;
  top: var(--card-pad);
  left: var(--card-pad);
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  color: var(--accent);
  background: rgba(12, 12, 16, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--grid-transition);
}

.hero-grid__card-icon--logo {
  width: auto;
  height: 60px;
  padding: 0;
  background: none;
  border: 0;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.hero-grid__card:hover .hero-grid__card-icon {
  transform: translateY(-2px) rotate(-3deg);
}

.hero-grid__card-logo {
  height: 100%;
  width: auto;
  max-width: 130px;
  object-fit: contain;
  filter: drop-shadow(0 4px 14px rgba(0, 0, 0, 0.55));
}

.hero-grid__card-svg {
  width: 32px;
  height: 32px;
}

/* Card Content: anchored to the bottom so CTAs align across a row */
.hero-grid__card-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--card-pad);
  width: 100%;
  min-width: 0;
}

/* Card Label */
.hero-grid__card-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  max-width: 100%;
  margin-bottom: 0.6rem;
  font-size: 0.68rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.6);
}

.hero-grid__card-label::before {
  content: '';
  flex: none;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

/* Card Title */
.hero-grid__card-title {
  max-width: 100%;
  font-family: 'Be Vietnam Pro', system-ui, sans-serif;
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
  color: var(--grid-text);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.35);
  text-wrap: balance;
  overflow-wrap: break-word;
}

.hero-grid__card-title em {
  font-style: normal;
  color: var(--accent);
}

/* Card Description */
.hero-grid__card-desc {
  max-width: 100%;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--grid-text-muted);
  margin: 0 0 0.9rem;
  text-wrap: pretty;
}

/* Card Tags */
.hero-grid__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.hero-grid__card-tag {
  padding: 0.28rem 0.7rem;
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.3;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Card CTA: text + accent arrow chip, fills with the accent on hover/focus */
.hero-grid__card-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.35rem 0.35rem 0.35rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 999px;
  color: var(--grid-text);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--grid-transition), color var(--grid-transition), border-color var(--grid-transition);
}

.hero-grid__card-cta-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  transition: transform var(--grid-transition), background var(--grid-transition);
}

.hero-grid__card-cta-icon svg {
  width: 15px;
  height: 15px;
}

.hero-grid__card:hover .hero-grid__card-cta,
.hero-grid__card:focus-visible .hero-grid__card-cta {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: transparent;
}

.hero-grid__card:hover .hero-grid__card-cta-icon,
.hero-grid__card:focus-visible .hero-grid__card-cta-icon {
  transform: translateX(3px);
  color: var(--accent);
  background: var(--accent-ink);
}

/* Feature cards (Piano, Đàn tranh) get more presence */
.hero-grid__card--feature {
  padding-top: var(--feature-icon-zone);
}

.hero-grid__card--feature .hero-grid__card-content {
  padding: var(--feature-pad);
}

.hero-grid__card--feature .hero-grid__card-icon {
  top: var(--feature-pad);
  left: var(--feature-pad);
  width: 64px;
  height: 64px;
  border-radius: 20px;
}

.hero-grid__card--feature .hero-grid__card-svg {
  width: 40px;
  height: 40px;
}

.hero-grid__card--feature .hero-grid__card-title {
  font-size: clamp(2.2rem, 3.6vw, 3.25rem);
  line-height: 1.05;
  margin-bottom: 0.6rem;
}

.hero-grid__card--feature .hero-grid__card-title em {
  display: block;
}

.hero-grid__card--feature .hero-grid__card-desc {
  font-size: 1.05rem;
  max-width: 34ch;
}

.hero-grid__card--feature .hero-grid__card-cta {
  font-size: 0.95rem;
  padding: 0.4rem 0.4rem 0.4rem 1.3rem;
}

.hero-grid__card--feature .hero-grid__card-cta-icon {
  width: 36px;
  height: 36px;
}

/* Stats Section */
.hero-grid__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: var(--grid-max);
  margin: 3.5rem auto 0;
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
  position: relative;
  z-index: 1;
}

.hero-grid__stat {
  padding: 1.75rem 1rem;
  text-align: center;
}

.hero-grid__stat + .hero-grid__stat {
  border-left: 1px solid var(--grid-line);
}

.hero-grid__stat-number {
  display: block;
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--grid-text);
  font-variant-numeric: tabular-nums;
}

.hero-grid__stat-label {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grid-text-faint);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet: 2 columns. Full-width features open each group; pairs follow;
   Drum closes the first group full-width so no row is left half-empty. */
@media (max-width: 1023.98px) {
  .hero-grid__container {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: auto;
  }

  .hero-grid__card {
    min-height: 300px;
  }

  .hero-grid__card--piano,
  .hero-grid__card--dantranh,
  .hero-grid__card--drum {
    grid-column: 1 / -1;
    grid-row: auto;
  }

  .hero-grid__card--feature {
    min-height: 420px;
  }

  .hero-grid__card--feature .hero-grid__card-title {
    font-size: clamp(2rem, 4.6vw, 2.75rem);
  }
}

@media (max-width: 767.98px) {
  .hero-grid {
    --grid-gap: 12px;
    --card-pad: 1rem;
    --card-icon-zone: 4.5rem;
    --feature-pad: 1.25rem;
    --feature-icon-zone: 5.5rem;
    padding: 24px 1rem 2.5rem;
  }

  .hero-grid__intro {
    margin-bottom: 1.5rem;
  }

  .hero-grid__group + .hero-grid__group {
    margin-top: 2.25rem;
  }

  .hero-grid__group-title {
    margin-bottom: 0.85rem;
    font-size: 0.8rem;
    letter-spacing: 0.12em;
  }

  .hero-grid__card {
    min-height: 250px;
    border-radius: 18px;
  }

  .hero-grid__card--feature {
    min-height: 340px;
  }

  .hero-grid__card-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
  }

  .hero-grid__card-svg {
    width: 26px;
    height: 26px;
  }

  .hero-grid__card-icon--logo {
    width: auto;
    height: 44px;
  }

  .hero-grid__card-logo {
    max-width: 100px;
  }

  .hero-grid__card-label {
    gap: 0.4rem;
    margin-bottom: 0.4rem;
    font-size: 0.64rem;
    letter-spacing: 0.1em;
  }

  .hero-grid__card-label::before {
    width: 12px;
  }

  .hero-grid__card-title {
    font-size: 1.35rem;
    margin-bottom: 0.3rem;
  }

  .hero-grid__card-desc {
    font-size: 0.875rem;
    line-height: 1.45;
    margin-bottom: 0.75rem;
  }

  .hero-grid__card-tags {
    gap: 0.35rem;
    margin-bottom: 0.85rem;
  }

  .hero-grid__card-tag {
    padding: 0.22rem 0.6rem;
    font-size: 0.7rem;
  }

  .hero-grid__card-cta {
    gap: 0.55rem;
    padding: 0.25rem 0.25rem 0.25rem 0.9rem;
    font-size: 0.8rem;
  }

  .hero-grid__card-cta-icon {
    width: 28px;
    height: 28px;
  }

  .hero-grid__card-cta-icon svg {
    width: 14px;
    height: 14px;
  }

  .hero-grid__card--feature .hero-grid__card-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
  }

  .hero-grid__card--feature .hero-grid__card-svg {
    width: 32px;
    height: 32px;
  }

  .hero-grid__card--feature .hero-grid__card-label {
    font-size: 0.68rem;
    letter-spacing: 0.14em;
  }

  .hero-grid__card--feature .hero-grid__card-title {
    font-size: clamp(1.85rem, 1.4rem + 2.2vw, 2.4rem);
    margin-bottom: 0.4rem;
  }

  .hero-grid__card--feature .hero-grid__card-desc {
    font-size: 0.95rem;
    margin-bottom: 0.85rem;
  }

  .hero-grid__card--feature .hero-grid__card-cta {
    font-size: 0.85rem;
    padding: 0.3rem 0.3rem 0.3rem 1rem;
  }

  .hero-grid__card--feature .hero-grid__card-cta-icon {
    width: 32px;
    height: 32px;
  }

  .hero-grid__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 2.5rem;
  }

  .hero-grid__stat {
    padding: 1.25rem 0.5rem;
  }

  .hero-grid__stat:nth-child(3) {
    border-left: 0;
  }

  .hero-grid__stat:nth-child(n + 3) {
    border-top: 1px solid var(--grid-line);
  }
}

/* Small phones: one card per row so every title and description stays legible */
@media (max-width: 575.98px) {
  .hero-grid__container {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-grid__card {
    min-height: 240px;
  }

  .hero-grid__card--feature {
    min-height: 320px;
  }
}

/* ==========================================================================
   Animations
   ========================================================================== */

.hero-grid__card {
  animation: cardFadeIn 0.8s var(--grid-ease) backwards;
}

.hero-grid__card:nth-child(1) { animation-delay: 0.05s; }
.hero-grid__card:nth-child(2) { animation-delay: 0.1s; }
.hero-grid__card:nth-child(3) { animation-delay: 0.15s; }
.hero-grid__card:nth-child(4) { animation-delay: 0.2s; }
.hero-grid__card:nth-child(5) { animation-delay: 0.25s; }
.hero-grid__card:nth-child(6) { animation-delay: 0.3s; }

/* Continue the stagger into the second group */
.hero-grid__container--traditional .hero-grid__card:nth-child(1) { animation-delay: 0.35s; }
.hero-grid__container--traditional .hero-grid__card:nth-child(2) { animation-delay: 0.4s; }
.hero-grid__container--traditional .hero-grid__card:nth-child(3) { animation-delay: 0.45s; }
.hero-grid__container--traditional .hero-grid__card:nth-child(4) { animation-delay: 0.5s; }
.hero-grid__container--traditional .hero-grid__card:nth-child(5) { animation-delay: 0.55s; }

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(28px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-grid__stats {
  animation: statsSlideIn 0.8s var(--grid-ease) 0.6s backwards;
}

@keyframes statsSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-grid__card,
  .hero-grid__stats {
    animation: none;
  }

  .hero-grid__card,
  .hero-grid__card-bg,
  .hero-grid__card-icon,
  .hero-grid__card-cta,
  .hero-grid__card-cta-icon {
    transition: none;
  }

  .hero-grid__card:hover,
  .hero-grid__card:focus-visible,
  .hero-grid__card:hover .hero-grid__card-bg,
  .hero-grid__card:hover .hero-grid__card-icon,
  .hero-grid__card:hover .hero-grid__card-cta-icon,
  .hero-grid__card:focus-visible .hero-grid__card-cta-icon {
    transform: none;
  }

  .hero-grid__card-bg {
    transform: none;
  }
}

/* Smooth scrolling (pre-existing global rule, kept unchanged for other pages) */
html {
  scroll-behavior: smooth;
}