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

body {
  background: #0b0e17;
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: #eef5ff;
  scroll-behavior: smooth;
}

.bg-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 30%, #0f172f, #02040c);
  z-index: -2;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  position: relative;
  z-index: 2;
}

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
  background: rgba(10, 20, 35, 0.6);
  backdrop-filter: blur(12px);
  border-radius: 2rem;
  padding: 2rem 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.25);
  box-shadow: 0 20px 35px -12px black;
}

.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: #1a2a3f;
  padding: 0.45rem 1.2rem;
  border-radius: 60px;
  font-weight: 600;
  font-size: 0.85rem;
  color: #9ad0f5;
  text-decoration: none;
  margin-bottom: 1.2rem;
  transition: 0.2s;
}

.repo-link:hover {
  background: #2c4f6e;
  color: white;
}

h1 {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff, #7bc5ff, #38bdf8);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}

.sub {
  color: #b4d0f0;
  max-width: 680px;
  margin: 0.8rem auto 0;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin: 2rem 0 1.8rem;
}

.filter-btn {
  background: #141e2c;
  border: none;
  padding: 0.5rem 1.4rem;
  border-radius: 40px;
  font-weight: 600;
  color: #c9e2ff;
  cursor: pointer;
  transition: 0.2s;
  font-size: 0.85rem;
  backdrop-filter: blur(4px);
}

.filter-btn i {
  margin-right: 6px;
}

.filter-btn.active,
.filter-btn:hover {
  background: #2d6a8f;
  color: white;
  box-shadow: 0 4px 12px rgba(0, 160, 210, 0.3);
}

.days-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.day-card {
  background: rgba(18, 28, 45, 0.85);
  backdrop-filter: blur(4px);
  border-radius: 1.5rem;
  padding: 1.2rem;
  border-left: 4px solid #2c9cd4;
  transition: all 0.2s ease;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
}

.day-card:hover {
  transform: translateY(-5px);
  background: #1a293f;
  border-left-color: #5ee0fa;
}

.day-number {
  font-size: 0.75rem;
  font-weight: 700;
  background: #0f2633;
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: 20px;
  width: fit-content;
  color: #8bcbff;
  letter-spacing: 0.5px;
}

.day-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0.6rem 0 0.4rem;
  line-height: 1.3;
}

.day-desc {
  font-size: 0.85rem;
  color: #cbdff5;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.resource-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #0c1a28;
  padding: 0.5rem 0.8rem;
  border-radius: 40px;
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  color: #e0f0ff;
  transition: 0.2s;
  border: 1px solid #2c577a;
  width: fit-content;
}

.resource-link i {
  font-size: 0.8rem;
  color: #4bc0ff;
}

.resource-link:hover {
  background: #00a3c4;
  border-color: #00e0ff;
  color: #0a0f1f;
}

.resource-link:hover i {
  color: #0a0f1f;
}

.phase-badge {
  font-size: 0.7rem;
  background: #182b3c;
  border-radius: 20px;
  padding: 0.2rem 0.6rem;
  width: fit-content;
  margin-bottom: 0.6rem;
}

.footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  font-size: 0.8rem;
  border-top: 1px solid #1f3b4f;
}

@media (max-width: 700px) {
  .container {
    padding: 1.2rem;
  }
  h1 {
    font-size: 1.8rem;
  }
  .days-grid {
    grid-template-columns: 1fr;
  }
}