@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;800&display=swap');

:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8; /* Фирменный цвет Lake Digital */
  --border-color: rgba(255, 255, 255, 0.1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* HEADER */
.site-header {
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 24px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--text-main);
}

/* HERO SECTION */
.hero {
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 15px;
  letter-spacing: -1px;
}

.hero .lead {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* SECTIONS */
.section {
  padding: 80px 0;
  text-align: center;
}

.section.alt {
  background: rgba(255, 255, 255, 0.02);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 40px;
}

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

.course-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 40px 30px;
  position: relative;
  transition: transform 0.3s, box-shadow 0.3s;
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.course-card.featured {
  border: 2px solid var(--accent);
  background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

.course-card h3 {
  font-size: 1.5rem;
  margin-top: 0;
}

.badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #0f172a;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
}

.price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 20px 0;
}

.features {
  list-style: none;
  padding: 0;
  margin: 0 0 30px 0;
  text-align: left;
}

.features li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.95rem;
}

.features li:last-child {
  border-bottom: none;
}

/* BUTTONS */
.btn {
  display: inline-block;
  width: 100%;
  padding: 15px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 800;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: opacity 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #0f172a;
}

.btn-primary:hover {
  opacity: 0.9;
}

/* MODAL WINDOWS (TERMS/PRIVACY) */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.9);
  overflow: auto;
}

.modal-content {
  background-color: var(--card-bg);
  margin: 10% auto;
  padding: 40px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 90%;
  max-width: 700px;
  position: relative;
  color: var(--text-muted);
}

.modal-content h2, .modal-content h3 {
  color: var(--text-main);
}

.close {
  color: var(--text-muted);
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close:hover {
  color: var(--text-main);
}

/* FOOTER */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
}

.footer-brand span {
  font-weight: 800;
  color: var(--text-main);
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

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

.separator {
  margin: 0 10px;
  color: var(--border-color);
}