:root {
  --sn-primary: #4146E5;
  --sn-primary-dark: #3438c9;
  --sn-secondary: #8B5CF6;
  --sn-accent: #F59E0B;
  --sn-dark: #0F172A;
  --sn-gray: #94A3B8;
  --sn-gray-dark: #64748B;
  --sn-border: #E2E8F0;
  --sn-light: #F8FAFC;
  --sn-white: #FFFFFF;
  --sn-success: #16A34A;
  --sn-danger: #DC2626;
  --sn-warning: #F59E0B;
  --sn-radius-sm: 8px;
  --sn-radius-md: 12px;
  --sn-radius-lg: 16px;
  --sn-radius-xl: 24px;
  --sn-shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
  --sn-shadow-lg: 0 18px 48px rgba(15, 23, 42, 0.12);
  --sn-font-heading: Montserrat, system-ui, sans-serif;
  --sn-font-body: Inter, system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sn-font-body);
  color: var(--sn-dark);
  background: var(--sn-light);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--sn-font-heading); line-height: 1.2; margin: 0 0 .5em; color: var(--sn-dark); }
h1 { font-size: clamp(2rem, 4vw, 3.25rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); font-weight: 700; }
h3 { font-size: 1.35rem; font-weight: 700; }
p { margin: 0 0 1rem; }
a { color: var(--sn-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.sn-container { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.sn-container-narrow { max-width: 720px; }
.sn-section { padding: 72px 0; }
.sn-section-sm { padding: 40px 0; }
.sn-bg-white { background: var(--sn-white); }
.sn-bg-light { background: var(--sn-light); }

/* Header */
.sn-header { position: sticky; top: 0; z-index: 40; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--sn-border); }
.sn-header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 72px; }
.sn-brand { display: flex; align-items: center; gap: 10px; font-family: var(--sn-font-heading); font-weight: 800; font-size: 1.3rem; color: var(--sn-dark); }
.sn-brand:hover { text-decoration: none; }
.sn-logo-mark { width: 38px; height: 38px; border-radius: 11px; background: linear-gradient(135deg, var(--sn-primary), var(--sn-secondary)); display: grid; place-items: center; color: #fff; font-weight: 800; }
.sn-nav { display: flex; align-items: center; gap: 26px; }
.sn-nav a { color: var(--sn-dark); font-weight: 500; font-size: .95rem; }
.sn-nav a:hover { color: var(--sn-primary); text-decoration: none; }

/* Buttons */
.sn-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 22px; border-radius: var(--sn-radius-md); font-family: var(--sn-font-heading); font-weight: 600; font-size: .95rem; border: 1px solid transparent; cursor: pointer; transition: transform .12s ease, box-shadow .12s ease, background .12s ease; text-decoration: none; line-height: 1; }
.sn-btn:hover { text-decoration: none; transform: translateY(-1px); }
.sn-btn-primary { background: var(--sn-primary); color: #fff; }
.sn-btn-primary:hover { background: var(--sn-primary-dark); box-shadow: 0 10px 24px rgba(65,70,229,.28); }
.sn-btn-secondary { background: var(--sn-secondary); color: #fff; }
.sn-btn-accent { background: var(--sn-accent); color: var(--sn-dark); }
.sn-btn-outline { background: transparent; border-color: var(--sn-primary); color: var(--sn-primary); }
.sn-btn-ghost { background: var(--sn-light); color: var(--sn-dark); border-color: var(--sn-border); }
.sn-btn-danger { background: var(--sn-danger); color: #fff; }
.sn-btn-sm { padding: 8px 14px; font-size: .82rem; border-radius: var(--sn-radius-sm); }
.sn-btn-block { width: 100%; }
.sn-btn-lg { padding: 15px 30px; font-size: 1.02rem; }
.sn-btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }

/* Cards */
.sn-card { background: var(--sn-white); border: 1px solid var(--sn-border); border-radius: var(--sn-radius-lg); box-shadow: var(--sn-shadow); overflow: hidden; }
.sn-card-body { padding: 24px; }
.sn-card-hover { transition: transform .15s ease, box-shadow .15s ease; }
.sn-card-hover:hover { transform: translateY(-4px); box-shadow: var(--sn-shadow-lg); text-decoration: none; }

/* Grid */
.sn-grid { display: grid; gap: 24px; }
.sn-grid-2 { grid-template-columns: repeat(2, 1fr); }
.sn-grid-3 { grid-template-columns: repeat(3, 1fr); }
.sn-grid-4 { grid-template-columns: repeat(4, 1fr); }
.sn-flex { display: flex; }
.sn-flex-between { display: flex; align-items: center; justify-content: space-between; }
.sn-flex-center { display: flex; align-items: center; }
.sn-gap-8 { gap: 8px; } .sn-gap-12 { gap: 12px; } .sn-gap-16 { gap: 16px; } .sn-gap-24 { gap: 24px; }
.sn-wrap { flex-wrap: wrap; }
.sn-mt-8 { margin-top: 8px; } .sn-mt-16 { margin-top: 16px; } .sn-mt-24 { margin-top: 24px; } .sn-mt-32 { margin-top: 32px; }
.sn-mb-0 { margin-bottom: 0; } .sn-mb-8 { margin-bottom: 8px; } .sn-mb-16 { margin-bottom: 16px; } .sn-mb-24 { margin-bottom: 24px; }
.sn-text-center { text-align: center; }
.sn-muted { color: var(--sn-gray-dark); }
.sn-small { font-size: .85rem; }
.sn-accent-text { color: var(--sn-accent); }
.sn-primary-text { color: var(--sn-primary); }
.sn-white-text { color: #fff; }

/* Hero */
.sn-hero { background: linear-gradient(135deg, #4146E5 0%, #8B5CF6 100%); color: #fff; border-radius: 0 0 var(--sn-radius-xl) var(--sn-radius-xl); position: relative; overflow: hidden; }
.sn-hero::after { content: ""; position: absolute; right: -80px; top: -80px; width: 340px; height: 340px; border-radius: 50%; background: rgba(255,255,255,.08); }
.sn-hero h1, .sn-hero h2 { color: #fff; }
.sn-hero p { color: rgba(255,255,255,.9); font-size: 1.1rem; }
.sn-hero-inner { padding: 88px 0 96px; max-width: 720px; position: relative; z-index: 1; }
.sn-eyebrow { display: inline-block; background: rgba(255,255,255,.16); padding: 6px 14px; border-radius: 999px; font-size: .8rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; margin-bottom: 18px; }

/* Forms */
.sn-field { margin-bottom: 18px; }
.sn-label { display: block; font-weight: 600; font-size: .88rem; margin-bottom: 6px; }
.sn-input, .sn-select, .sn-textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--sn-border); border-radius: var(--sn-radius-sm); font-family: inherit; font-size: .95rem; background: #fff; color: var(--sn-dark); }
.sn-input:focus, .sn-select:focus, .sn-textarea:focus { outline: none; border-color: var(--sn-primary); box-shadow: 0 0 0 3px rgba(65,70,229,.15); }
.sn-textarea { min-height: 120px; resize: vertical; }
.sn-checkbox { display: flex; align-items: center; gap: 10px; font-size: .92rem; }

/* Badge */
.sn-badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 11px; border-radius: 999px; font-size: .75rem; font-weight: 600; }
.sn-badge-primary { background: rgba(65,70,229,.12); color: var(--sn-primary); }
.sn-badge-success { background: rgba(22,163,74,.12); color: var(--sn-success); }
.sn-badge-warning { background: rgba(245,158,11,.16); color: #b45309; }
.sn-badge-danger { background: rgba(220,38,38,.12); color: var(--sn-danger); }
.sn-badge-gray { background: #eef2f7; color: var(--sn-gray-dark); }

/* Course card */
.sn-course-thumb { aspect-ratio: 16/10; background: linear-gradient(135deg, #eef0ff, #f3ebff); display: grid; place-items: center; color: var(--sn-primary); font-family: var(--sn-font-heading); font-weight: 700; font-size: 1.1rem; overflow: hidden; }
.sn-course-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sn-course-meta { display: flex; align-items: center; gap: 14px; color: var(--sn-gray-dark); font-size: .82rem; flex-wrap: wrap; }
.sn-price { font-family: var(--sn-font-heading); font-weight: 800; font-size: 1.15rem; color: var(--sn-dark); }
.sn-price-old { text-decoration: line-through; color: var(--sn-gray); font-weight: 500; font-size: .9rem; margin-left: 6px; }

/* Progress */
.sn-progress { height: 10px; background: #eef2f7; border-radius: 999px; overflow: hidden; }
.sn-progress span { display: block; height: 100%; background: linear-gradient(90deg, var(--sn-primary), var(--sn-secondary)); border-radius: 999px; }

/* Table */
.sn-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.sn-table th { text-align: left; padding: 12px 14px; background: var(--sn-light); color: var(--sn-gray-dark); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; border-bottom: 1px solid var(--sn-border); }
.sn-table td { padding: 14px; border-bottom: 1px solid var(--sn-border); vertical-align: middle; }
.sn-table tr:hover td { background: #fbfcfe; }

/* Alerts */
.sn-alert { padding: 14px 16px; border-radius: var(--sn-radius-md); margin-bottom: 18px; font-size: .92rem; border: 1px solid transparent; }
.sn-alert-success { background: rgba(22,163,74,.1); color: #166534; border-color: rgba(22,163,74,.2); }
.sn-alert-error { background: rgba(220,38,38,.08); color: #991b1b; border-color: rgba(220,38,38,.18); }
.sn-alert-info { background: rgba(65,70,229,.08); color: #3730a3; border-color: rgba(65,70,229,.18); }

/* Footer */
.sn-footer { background: var(--sn-dark); color: #cbd5e1; padding: 60px 0 28px; margin-top: 80px; }
.sn-footer h4 { color: #fff; font-size: .95rem; margin-bottom: 14px; }
.sn-footer a { color: #cbd5e1; display: block; margin-bottom: 8px; font-size: .9rem; }
.sn-footer a:hover { color: #fff; text-decoration: none; }
.sn-footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 36px; padding-top: 22px; font-size: .82rem; color: #94a3b8; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* Admin layout */
.sn-admin { display: flex; min-height: 100vh; background: var(--sn-light); }
.sn-sidebar { width: 256px; background: var(--sn-dark); color: #cbd5e1; padding: 22px 16px; position: sticky; top: 0; height: 100vh; overflow-y: auto; flex-shrink: 0; }
.sn-sidebar .sn-brand { color: #fff; margin-bottom: 26px; padding: 0 6px; }
.sn-side-link { display: flex; align-items: center; gap: 11px; padding: 11px 13px; border-radius: var(--sn-radius-sm); color: #cbd5e1; font-size: .9rem; font-weight: 500; margin-bottom: 3px; }
.sn-side-link:hover { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.sn-side-link.active { background: var(--sn-primary); color: #fff; }
.sn-side-heading { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; color: #64748b; margin: 20px 13px 8px; }
.sn-admin-main { flex: 1; min-width: 0; }
.sn-admin-topbar { height: 64px; background: #fff; border-bottom: 1px solid var(--sn-border); display: flex; align-items: center; justify-content: space-between; padding: 0 26px; position: sticky; top: 0; z-index: 30; }
.sn-admin-content { padding: 28px 26px 60px; }
.sn-stat { background: #fff; border: 1px solid var(--sn-border); border-radius: var(--sn-radius-lg); padding: 20px; box-shadow: var(--sn-shadow); }
.sn-stat-label { font-size: .78rem; color: var(--sn-gray-dark); text-transform: uppercase; letter-spacing: .04em; font-weight: 600; }
.sn-stat-value { font-family: var(--sn-font-heading); font-weight: 800; font-size: 1.85rem; margin-top: 6px; }
.sn-page-title { font-size: 1.55rem; font-weight: 800; font-family: var(--sn-font-heading); margin-bottom: 4px; }

/* Landing feature / steps */
.sn-icon-badge { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; background: rgba(65,70,229,.1); color: var(--sn-primary); margin-bottom: 16px; }
.sn-step-num { width: 40px; height: 40px; border-radius: 50%; background: var(--sn-primary); color: #fff; display: grid; place-items: center; font-weight: 700; font-family: var(--sn-font-heading); margin-bottom: 14px; }
.sn-testimonial { background: #fff; border: 1px solid var(--sn-border); border-radius: var(--sn-radius-lg); padding: 24px; }
.sn-stars { color: var(--sn-accent); letter-spacing: 2px; }

/* Verify certificate */
.sn-cert-valid { background: linear-gradient(135deg, #4146E5, #8B5CF6); color: #fff; border-radius: var(--sn-radius-lg); padding: 32px; }
.sn-cert-row { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,.18); }
.sn-cert-row:last-child { border-bottom: none; }

/* Responsive */
@media (max-width: 900px) {
  .sn-grid-3, .sn-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .sn-nav { display: none; }
  .sn-sidebar { position: fixed; left: -260px; transition: left .2s ease; z-index: 50; }
  .sn-sidebar.open { left: 0; }
}
@media (max-width: 620px) {
  .sn-grid-2, .sn-grid-3, .sn-grid-4 { grid-template-columns: 1fr; }
  .sn-section { padding: 48px 0; }
  .sn-hero-inner { padding: 60px 0 68px; }
}

.sn-hidden { display: none !important; }
.sn-w-full { width: 100%; }
.sn-divider { height: 1px; background: var(--sn-border); margin: 24px 0; border: 0; }