@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body{
  min-height: 100vh;
  color: white;
  overflow-x: hidden;

  background:
    radial-gradient(circle at top left, #1f2937, transparent 30%),
    radial-gradient(circle at bottom right, #111827, transparent 30%),
    #050505;
}

/* Navbar */

.navbar{
  width: 100%;
  padding: 24px 80px;

  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo{
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0;
}

.nav-buttons{
  display: flex;
  gap: 16px;
}

.login-btn,
.signup-btn{
  padding: 12px 22px;
  border-radius: 14px;

  border: none;
  cursor: pointer;

  font-weight: 600;

  transition: 0.25s ease;
}

.login-btn{
  background: white;
  color: black;

  border: 1px solid white;
}

.login-btn:hover{
  transform: translateY(-2px);
}
.signup-btn{
  background: white;
  color: black;
}

.signup-btn:hover{
  transform: translateY(-2px);
}

/* Hero */

.hero{
  min-height: calc(82vh - 90px);

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  text-align: center;
  padding: 20px;
}

.hero h1{
  font-size: 76px;
  line-height: 1.05;

  margin-bottom: 24px;

  letter-spacing: 0;
}

.hero p{
  max-width: 700px;

  font-size: 20px;
  line-height: 1.7;

  color: #9ca3af;

  margin-bottom: 40px;
}

.hero-buttons{
  display: flex;
  gap: 18px;
}

.primary-btn,
.secondary-btn{
  padding: 16px 30px;

  border-radius: 18px;

  border: none;

  cursor: pointer;

  font-size: 15px;
  font-weight: 600;

  transition: 0.25s ease;
}

.primary-btn{
  background: white;
  color: black;

  box-shadow:
    0 10px 30px rgba(255,255,255,0.08);
}

.primary-btn:hover{
  transform: translateY(-3px);
}

.secondary-btn{
  background: rgba(255,255,255,0.05);

  color: white;

  border: 1px solid rgba(255,255,255,0.08);
}

.secondary-btn:hover{
  background: rgba(255,255,255,0.08);
}

/* Problems */

.problems-section{
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto 80px;
  padding: 48px 0 70px;
}

/* Home components centered on landing page */
.home-components{ }

.section-heading{
  max-width: 680px;
  margin-bottom: 28px;
}

.section-kicker{
  display: inline-block;
  margin-bottom: 12px;
  color: #93c5fd;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.section-heading h2{
  font-size: 46px;
  line-height: 1.1;
  margin-bottom: 14px;
}

.section-heading p{
  color: #9ca3af;
  font-size: 18px;
  line-height: 1.7;
}

.problem-card{
  width: 100%;
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  background: rgba(255,255,255,0.05);
  box-shadow: 0 20px 50px rgba(0,0,0,0.22);
}

.problem-meta{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
  color: #cbd5e1;
  font-size: 13px;
  font-weight: 600;
}

.problem-meta span{
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px;
  background: rgba(0,0,0,0.22);
}

.problem-meta .easy{
  color: #86efac;
  border-color: rgba(134,239,172,0.28);
}

.problem-card h3{
  margin-bottom: 12px;
  font-size: 28px;
}

.problem-card p{
  max-width: 760px;
  color: #a7b0c0;
  font-size: 16px;
  line-height: 1.7;
}

.problem-footer{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-top: 26px;
  color: #94a3b8;
  font-size: 14px;
  font-weight: 600;
}

.solve-btn{
  padding: 13px 20px;
  border: none;
  border-radius: 8px;
  background: white;
  color: #050505;
  cursor: pointer;
  font-weight: 700;
  transition: 0.25s ease;
}

.solve-btn:hover{
  transform: translateY(-2px);
}

@media (max-width: 760px){
  .navbar{
    padding: 20px;
  }

  .hero{
    min-height: auto;
    padding: 74px 20px 58px;
  }

  .hero h1{
    font-size: 48px;
    letter-spacing: 0;
  }

  .hero p{
    font-size: 17px;
  }

  .hero-buttons,
  .problem-footer{
    flex-direction: column;
    align-items: stretch;
  }

  .primary-btn,
  .secondary-btn,
  .solve-btn{
    width: 100%;
  }

  .section-heading h2{
    font-size: 34px;
  }

  .problem-card{
    padding: 22px;
  }
}