/* style.css */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #8b5cf6;
  --dark: #0b0f19;
  --card-bg: #151b2b;
  --accent: #f59e0b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: #1e293b;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background-color: var(--dark);
  color: var(--text-main);
  line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header {
  position: fixed; top: 0; left: 0; right: 0;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

nav { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; }
.logo-img { height: 40px; width: auto; display: block; }
.nav-links { display: flex; gap: 24px; list-style: none; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-main); font-weight: 500; transition: color 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

.btn {
  display: inline-block; padding: 10px 24px; border-radius: 8px;
  font-weight: 600; text-decoration: none; transition: all 0.3s;
  cursor: pointer; border: none; font-size: 15px; font-family: inherit;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: #7c3aed; transform: translateY(-2px); }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }

/* Секции */
section { padding: 100px 0; }
.section-title { text-align: center; font-size: clamp(28px, 4vw, 42px); font-weight: 900; margin-bottom: 16px; }
.section-subtitle { text-align: center; color: var(--text-muted); font-size: 18px; margin-bottom: 60px; }

/* Hero */
.hero {
  padding: 160px 0 100px;
  background: radial-gradient(circle at top right, rgba(139,92,246,0.15) 0%, transparent 50%), var(--dark);
  border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: clamp(36px, 6vw, 64px); line-height: 1.1; margin-bottom: 24px; font-weight: 900; }
.hero h1 span { color: var(--primary); }
.hero p { font-size: 20px; color: var(--text-muted); margin-bottom: 36px; max-width: 600px; }

/* Карточки (для курсов, групп, уроков) */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card {
  background: var(--card-bg); border-radius: 16px; padding: 30px;
  border: 1px solid var(--border); transition: all 0.3s;
}
.card:hover { transform: translateY(-5px); border-color: var(--primary); }
.card h3 { font-size: 20px; margin-bottom: 12px; }
.card p { color: var(--text-muted); margin-bottom: 20px; }

/* Модальное окно (Авторизация) */
.modal-overlay {
  display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.8); z-index: 9999; align-items: center; justify-content: center;
  backdrop-filter: blur(5px);
}
.modal-content {
  background: var(--card-bg); padding: 40px; border-radius: 16px;
  border: 1px solid var(--border); width: 100%; max-width: 400px;
}
.modal-content input {
  width: 100%; padding: 14px; margin-bottom: 16px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--dark); color: white;
  font-size: 16px;
}
.modal-content input:focus { outline: 2px solid var(--primary); }

/* Футер */
footer { background: var(--dark); border-top: 1px solid var(--border); color: var(--text-muted); padding: 40px 0 20px; text-align: center; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 120px 0 60px; }
}