:root {
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', sans-serif;
  --color-primary: #52896F;      /* Efor Sage Green */
  --color-primary-light: #E2EAD8;/* Efor Light Green Box */
  --color-accent: #E86B67;       /* Efor Highlight Accent */
  --color-dark: #1F2226;         /* Efor Dark Header */
  --color-muted: #6B7280;
  --color-bg-light: #FDFBF7;     /* Warm Cream Background */
  --color-bg-blue: #EBF2F7;      /* Light Blue Box */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 30px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); color: var(--color-dark); background: #FFF; line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: all 0.2s; }
img { max-width: 100%; height: auto; display: block; }

/* --- Navigation & Mobile Drawer --- */
header { background: #FFF; position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid #F0F0F0; }
.nav-container { display: flex; justify-content: space-between; align-items: center; padding: 18px 5%; max-width: 1300px; margin: 0 auto; }
.brand-logo h1 { font-family: var(--font-serif); font-size: 1.6rem; font-weight: 700; color: var(--color-dark); }
.brand-logo p { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 2px; color: var(--color-primary); font-weight: 700; }

nav ul { display: flex; gap: 28px; font-weight: 600; font-size: 0.9rem; list-style: none; }
nav ul a:hover, nav ul a.active { color: var(--color-accent); }

.nav-actions { display: flex; align-items: center; gap: 16px; }
.cart-btn { position: relative; font-size: 1.2rem; cursor: pointer; }
.cart-count { position: absolute; top: -8px; right: -10px; background: var(--color-accent); color: #FFF; font-size: 0.7rem; font-weight: 700; width: 18px; height: 18px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }

.mobile-menu-toggle { display: none; font-size: 1.6rem; background: none; border: none; cursor: pointer; color: var(--color-dark); }

/* --- Global UI Components --- */
.badge { display: inline-block; background: var(--color-primary-light); color: var(--color-primary); padding: 5px 14px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.section-subtitle { color: var(--color-muted); font-size: 0.85rem; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px; text-align: center; }
.section-title { font-family: var(--font-serif); font-size: 2.4rem; color: var(--color-dark); margin-bottom: 40px; text-align: center; }
.section-title span { color: var(--color-accent); border-bottom: 2px solid var(--color-accent); }

.btn-black { background: var(--color-dark); color: #FFF; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 700; font-size: 0.9rem; display: inline-block; text-align: center; cursor: pointer; border: none; }
.btn-black:hover { background: var(--color-primary); }
.btn-green { background: var(--color-primary); color: #FFF; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 700; display: inline-block; text-align: center; border: none; cursor: pointer; }
.btn-green:hover { background: var(--color-dark); }

/* --- Page Header Banner --- */
.page-banner { background: var(--color-bg-light); padding: 60px 5% 40px; text-align: center; border-bottom: 1px solid #F0F0F0; }
.page-banner h1 { font-family: var(--font-serif); font-size: 2.8rem; color: var(--color-dark); }

/* --- Course Grid & Sidebar (Catalog) --- */
.catalog-container { max-width: 1300px; margin: 50px auto; padding: 0 5%; display: grid; grid-template-columns: 260px 1fr; gap: 40px; }
.sidebar-filter { background: #FFF; border: 1px solid #EFEFEF; padding: 24px; border-radius: var(--radius-md); height: fit-content; }
.sidebar-filter h3 { font-family: var(--font-serif); font-size: 1.2rem; margin-bottom: 16px; border-bottom: 1px solid #EEE; padding-bottom: 8px; }
.filter-group { margin-bottom: 20px; }
.filter-group label { display: block; font-size: 0.85rem; color: var(--color-muted); margin-bottom: 8px; cursor: pointer; }

.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 30px; }
.course-card { background: #FFF; border-radius: var(--radius-md); overflow: hidden; border: 1px solid #EFEFEF; box-shadow: 0 4px 15px rgba(0,0,0,0.03); transition: transform 0.2s; }
.course-card:hover { transform: translateY(-5px); }
.course-thumb { height: 180px; background-size: cover; background-position: center; position: relative; }
.course-body { padding: 20px; }
.course-stars { color: #FFB800; font-size: 0.85rem; margin-bottom: 6px; }
.course-title { font-family: var(--font-serif); font-size: 1.2rem; color: var(--color-dark); margin-bottom: 10px; line-height: 1.3; }
.course-meta { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--color-muted); border-top: 1px solid #F5F5F5; padding-top: 12px; margin-top: 12px; align-items: center; }
.price-tag { font-weight: 800; font-size: 1.1rem; color: var(--color-dark); }

/* --- Single Course Page Layout --- */
.single-course-container { max-width: 1300px; margin: 40px auto; padding: 0 5%; display: grid; grid-template-columns: 1fr 360px; gap: 50px; }
.course-hero-details h1 { font-family: var(--font-serif); font-size: 2.5rem; margin-bottom: 16px; }
.course-media-box { background: #000; border-radius: var(--radius-md); overflow: hidden; margin: 24px 0; aspect-ratio: 16/9; display: flex; align-items: center; justify-content: center; color: #FFF; }
.course-tab-nav { display: flex; gap: 20px; border-bottom: 2px solid #EEE; margin-bottom: 24px; }
.course-tab-nav button { background: none; border: none; padding: 12px 0; font-size: 1rem; font-weight: 700; color: var(--color-muted); cursor: pointer; border-bottom: 3px solid transparent; }
.course-tab-nav button.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.sticky-enroll-card { background: #FFF; border: 1px solid #EFEFEF; padding: 30px; border-radius: var(--radius-md); box-shadow: 0 10px 30px rgba(0,0,0,0.06); position: sticky; top: 100px; }
.sticky-enroll-card .price { font-size: 2rem; font-weight: 800; color: var(--color-dark); margin-bottom: 16px; }
.course-features-list { list-style: none; margin: 20px 0; border-top: 1px solid #EEE; padding-top: 16px; }
.course-features-list li { font-size: 0.9rem; color: var(--color-muted); margin-bottom: 10px; display: flex; justify-content: space-between; }

/* --- Footer & Instagram Feed --- */
.instagram-feed { display: grid; grid-template-columns: repeat(8, 1fr); height: 120px; overflow: hidden; }
.instagram-feed img { width: 100%; height: 100%; object-fit: cover; }
footer { background: #FFF; padding: 24px 5%; text-align: center; font-size: 0.85rem; color: var(--color-muted); border-top: 1px solid #F0F0F0; }

/* ==========================================
   MOBILE & TABLET RESPONSIVE OVERRIDES
   ========================================== */
@media (max-width: 992px) {
  .catalog-container { grid-template-columns: 1fr; }
  .single-course-container { grid-template-columns: 1fr; }
  .sticky-enroll-card { position: static; margin-top: 30px; }
  .instagram-feed { grid-template-columns: repeat(4, 1fr); height: auto; }
}

@media (max-width: 768px) {
  .mobile-menu-toggle { display: block; }
  nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #FFF; padding: 20px 5%; border-bottom: 1px solid #EEE; box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
  nav.open { display: block; }
  nav ul { flex-direction: column; gap: 16px; }
  
  .section-title { font-size: 1.8rem; }
  .page-banner h1 { font-size: 2rem; }
  .hero-container, .about-container { grid-template-columns: 1fr !important; text-align: center; gap: 30px !important; }
  .hero-text h1 { font-size: 2.2rem !important; }
  .hero-stats { justify-content: center; }
  .scallop-frame, .diamond-mask { width: 100% !important; max-width: 320px; height: 320px !important; margin: 0 auto; }
}