:root {
  --bg: #0f1724;
  --card: #0b1624;
  --muted: #9aa4b2;
  --accent: #5eead4;
  --accent-2: #60a5fa;
  --white: #f8fafc;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --warning-text: #fcd34d;
  --info-bg: rgba(59, 130, 246, 0.1);
  --info-border: #3b82f6;
  --max-width: 1100px;
}

* { box-sizing: border-box; }

body {
  font-family: Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  margin: 0;
  color: var(--white);
  background: linear-gradient(180deg, #071025 0%, #071527 60%);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* --- HEADER --- */
.site-header {
  backdrop-filter: saturate(140%) blur(6px);
  position: sticky;
  top: 0;
  background: rgba(7, 13, 26, 0.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  z-index: 100;
}

.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.brand { font-weight: 700; font-size: 1.05rem; color: var(--white); }
.nav a { color: var(--muted); margin-left: 18px; text-decoration: none; transition: color 0.3s; }
.nav a:hover { color: var(--accent); }

/* --- HERO --- */
.hero { padding: 90px 0 80px; background: linear-gradient(90deg, rgba(6, 11, 26, 0.6), rgba(6, 11, 26, 0.1)); }
.hero-inner { display: flex; flex-direction: column; gap: 18px; }
.hero h1 { font-size: 2.25rem; line-height: 1.05; margin: 0; background: linear-gradient(to right, #fff, #9aa4b2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.lead { color: var(--muted); max-width: 700px; }

/* --- BUTTONS --- */
.btn {
  display: inline-block;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #022;
  padding: 12px 24px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: opacity 0.3s, transform 0.2s;
  width: 100%; /* Full width on mobile */
  text-align: center;
}
.btn:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* --- SECTIONS & CARDS --- */
.section { padding: 60px 0; }
.section.alt { background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent); }
.section-title { margin: 0 0 40px; font-size: 1.5rem; text-align: center; }

.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin-top: 40px; }

.course-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  padding: 40px 30px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s;
}

.course-card:hover { border-color: rgba(255, 255, 255, 0.15); }
.course-card.featured { border: 2px solid var(--accent); transform: scale(1.02); z-index: 2; }

.course-card h3 { margin: 0 0 15px; font-size: 1.4rem; color: var(--white); }
.price { font-size: 2.5rem; font-weight: 700; color: var(--accent); margin: 20px 0; }

.features { list-style: none; padding: 0; margin: 30px 0; flex-grow: 1; }
.features li { padding: 8px 0; color: var(--muted); border-bottom: 1px solid rgba(255, 255, 255, 0.03); }
.features li:last-child { border-bottom: none; }

.badge { position: absolute; top: 20px; right: 20px; background: var(--accent); color: #022; padding: 6px 12px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; }

/* --- MODALS --- */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--card);
  padding: 40px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  max-width: 500px;
  width: 90%;
  position: relative;
  margin: 5vh auto;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.term-modal .modal-content { max-width: 700px; }

.modal-body {
  max-height: 60vh;
  overflow-y: auto;
  margin: 20px 0;
  padding-right: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Scrollbar styles */
.modal-body::-webkit-scrollbar { width: 8px; }
.modal-body::-webkit-scrollbar-track { background: rgba(255,255,255,0.02); }
.modal-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }
.modal-body::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

.close { position: absolute; top: 15px; right: 20px; font-size: 28px; font-weight: bold; cursor: pointer; color: var(--muted); z-index: 10; }
.close:hover { color: var(--white); }

/* --- LEGAL BLOCKS --- */
.modal-body h3 { color: var(--white); margin-top: 25px; margin-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 5px; }
.modal-body ul, .modal-body ol { padding-left: 20px; margin-bottom: 15px; }
.modal-body p { margin-bottom: 15px; }

/* Billing & Refund */
.billing-notice {
  background-color: var(--warning-bg);
  color: var(--warning-text);
  padding: 15px;
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 0.9em;
}
.billing-notice strong { color: #fbbf24; }

.refund-policy {
  background-color: var(--info-bg);
  padding: 15px;
  border-left: 4px solid var(--info-border);
  margin-bottom: 20px;
  color: #dbeafe;
}
.refund-policy strong { color: var(--accent-2); }

/* --- CHECKBOX & PAYPAL --- */
.checkbox-container { display: flex; align-items: flex-start; gap: 12px; margin: 20px 0; }
.checkbox-container input[type="checkbox"] { margin-top: 4px; cursor: pointer; accent-color: var(--accent); }
.checkbox-container label { cursor: pointer; color: var(--muted); font-size: 0.9rem; line-height: 1.4; }
.checkbox-container a { color: var(--accent); text-decoration: none; }
.checkbox-container a:hover { text-decoration: underline; }

#paypal-button-container { margin-top: 25px; min-height: 150px; }

/* --- FOOTER & MEDIA (ОБНОВЛЕННЫЙ ФУТЕР) --- */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 60px;
  background: #0f1724; 
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand {
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-brand span {
  font-weight: 700;
  /* Градиентный текст для логотипа */
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--white);
}

.separator {
  color: rgba(255, 255, 255, 0.1);
}

@media (min-width: 900px) {
  .hero-inner { flex-direction: row; justify-content: space-between; align-items: center; }
  .hero h1 { font-size: 3rem; }
  .course-card.featured { transform: scale(1.05); }
  .btn { width: auto; }
}

/* --- ADMIN PANEL STYLES (Оставлено для совместимости) --- */

.table-container { 
  overflow-x: auto; 
  background: var(--card); 
  border-radius: 16px; 
  border: 1px solid rgba(255, 255, 255, 0.06); 
  margin-top: 20px;
}

table { width: 100%; border-collapse: collapse; background: transparent; }

th { 
  text-align: left; 
  padding: 18px; 
  color: var(--muted); 
  border-bottom: 1px solid rgba(255, 255, 255, 0.06); 
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
}

th:hover { color: var(--accent); }

td { 
  padding: 18px; 
  border-bottom: 1px solid rgba(255, 255, 255, 0.03); 
  color: var(--white); 
  font-size: 0.95rem; 
}

tr:hover { background: rgba(255, 255, 255, 0.01); }

.badge-paid { 
  background: rgba(94, 234, 212, 0.1); 
  color: var(--accent); 
  padding: 5px 12px; 
  border-radius: 20px; 
  font-size: 0.8rem; 
  font-weight: 700; 
  border: 1px solid rgba(94, 234, 212, 0.2); 
}

.action-buttons { 
  display: flex; 
  gap: 12px; 
  opacity: 0; 
  transition: opacity 0.2s ease-in-out;
  justify-content: flex-end;
}

tr:hover .action-buttons { opacity: 1; }

.btn-icon { 
  background: transparent; 
  border: none; 
  cursor: pointer; 
  font-size: 1.2rem; 
  padding: 5px;
  transition: transform 0.2s ease, filter 0.2s ease;
  filter: grayscale(1) opacity(0.5); 
}

.btn-edit:hover { 
  transform: scale(1.3); 
  filter: grayscale(0) opacity(1) drop-shadow(0 0 8px var(--accent-2)); 
}

.btn-delete:hover { 
  transform: scale(1.3); 
  filter: grayscale(0) opacity(1) drop-shadow(0 0 8px #ef4444); 
}

.add-form {
  background: var(--card);
  padding: 25px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
  align-items: end;
}

.add-form label { display: block; color: var(--muted); font-size: 0.8rem; margin-bottom: 8px; }

.add-form input, .add-form select {
  width: 100%;
  padding: 12px;
  background: #0f1724;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--white);
  border-radius: 10px;
  outline: none;
}

.add-form input:focus { border-color: var(--accent); }

.stats-grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); 
  gap: 20px; 
  margin-bottom: 30px; 
}

.stat-card { 
  background: var(--card); 
  padding: 25px; 
  border-radius: 16px; 
  border: 1px solid rgba(255, 255, 255, 0.06); 
  text-align: center; 
}

.stat-number { 
  font-size: 2.5rem; 
  font-weight: 800; 
  color: var(--accent); 
  margin-top: 10px; 
}