/* kogni.pl global styles */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700&family=Source+Sans+3:ital,wght@0,400;0,600;1,400&display=swap');

:root {
  --bg-deep: #111116;
  --bg-card: #1a1a22;
  --bg-card-hover: #22222e;
  --bg-surface: #16161c;

  --text-primary: #e8e4df;
  --text-secondary: #a09a92;
  --text-dim: #6b6660;

  --accent: #e8a84c;
  --accent-soft: rgba(232, 168, 76, 0.15);
  --accent-hover: #f0bc6a;

  --teal: #5ab8a0;
  --teal-soft: rgba(90, 184, 160, 0.12);

  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --font-heading: 'Sora', sans-serif;
  --font-body: 'Source Sans 3', sans-serif;

  --max-width: 960px;
  --radius: 10px;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

/* --- Layout --- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(17, 17, 22, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

/* --- Typography --- */

h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.4rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

h2 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* --- Course cards --- */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-decoration: none;
  transition: background 0.25s, border-color 0.25s, transform 0.2s;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.course-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.course-card .card-semester {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.course-card .card-semester.sem-winter {
  color: var(--teal);
}

.course-card h3 {
  margin: 0;
}

.course-card .card-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.5;
  flex-grow: 1;
}

.course-card .card-meta {
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 8px;
}

/* --- Section spacing --- */

section {
  padding: 56px 0;
}

section + section {
  border-top: 1px solid var(--border);
}

/* --- Tags / badges --- */

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.03em;
}

.badge-spring {
  background: var(--accent-soft);
  color: var(--accent);
}

.badge-winter {
  background: var(--teal-soft);
  color: var(--teal);
}

/* --- Footer --- */

footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

footer a {
  color: var(--text-secondary);
}

/* --- Course page --- */

.course-hero {
  padding: 60px 0 40px;
}

.course-hero .badge {
  margin-bottom: 14px;
}

.course-hero h1 {
  margin-bottom: 12px;
}

.course-hero .subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.info-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.info-box .label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.info-box .value {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

.course-content h2 {
  margin-top: 40px;
}

.course-content p, .course-content ul {
  color: var(--text-secondary);
}

.course-content ul {
  padding-left: 20px;
  margin: 12px 0;
}

.course-content li {
  margin-bottom: 6px;
}

/* --- Responsive --- */

@media (max-width: 640px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.25rem; }

  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 0.82rem;
  }

  .course-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: 40px 0;
  }

  .course-hero {
    padding: 40px 0 24px;
  }
}