:root {
  --bg: #0f172a;
  --text: #f8fafc;
  --accent: #38bdf8;
  --card-bg: #1e293b;
  --card-text: #94a3b8;
}

body.light {
  --bg: #f8fafc;
  --text: #0f172a;
  --accent: #2563eb;
  --card-bg: #e2e8f0;
  --card-text: #334155;
}

body {
  background: var(--bg);
  color: var(--text);
  margin: 0;
  font-family: 'Inter', sans-serif;
  transition: background 0.3s, color 0.3s;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  margin: 0;
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a {
  font-weight: 600;
  text-decoration: none;
  color: var(--card-text);
  transition: color 0.3s;
}

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

header {
  background: var(--card-bg);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}

#hamburger {
  display: none;
  font-size: 1.8rem;
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  position: absolute;
  margin-left: 85%;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 100px);
  padding: 2rem;
  margin-top: 80px;
  box-sizing: border-box;
}

.container {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 0 20px rgba(0,0,0,0.3);
  text-align: center;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
}


h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.generator {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
}

.length-group {
  flex-basis: 100%;
  margin-bottom: 10px;
}

#length {
  background: var(--bg);
}

.options label {
  display: block;
  margin: 0.3rem 0;
  white-space: nowrap;
}

input[type="number"] {
  width: 60px;
  padding: 0.3rem;
  margin-left: 0.5rem;
  background: var(--bg);
  border: none;
  border-radius: 0.3rem;
  color: var(--text);
}

.output {
  display: flex;
  align-items: center;
  justify-content: center;
}

#password {
  flex: 1;
  padding: 0.5rem;
  font-size: 1.1rem;
  border-radius: 5px 0 0 5px;
  border: none;
  background: var(--bg);
  color: var(--text);
}

#hashedPassword {
  flex: 1;
  padding: 0.5rem;
  font-size: 1.1rem;
  border-radius: 5px 0 0 5px;
  border: none;
  background: var(--bg);
  color: var(--text);
}

#copy {
  padding: 0.5rem;
  font-size: 1rem;
  border: none;
  background: var(--accent);
  color: var(--bg);
  border-radius: 0 5px 5px 0;
  cursor: pointer;
}

#generate {
  padding: 0.8rem;
  font-size: 1rem;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: var(--bg);
  cursor: pointer;
  transition: background 0.3s ease;
}

#generate:hover {
  background: #0ea5e9;
}

#encrypt {
  background: var(--accent);
  color: var(--bg);
}

#themeToggle {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  z-index: 1000 !important;
  background: none;
  border: 2px solid var(--accent);
  color: var(--accent);
  padding: 0.4rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.3s;
}

#themeToggle:hover {
  background: var(--accent);
  color: var(--bg);
}

nav#navMenu {
  display: flex;
  gap: 1.5rem;
}

footer {
  text-align: center;
  padding: 2rem;
  background: var(--card-bg);
  color: var(--card-text);
  font-size: 0.9rem;
}

@media (max-width: 600px) {
      header {
        flex-wrap: wrap;
        padding: 1rem 1.5rem;
      }
      header h1 {
        flex-grow: 1;
      }
      #hamburger {
        display: block;
        position: static;
        margin-left: auto;
      }
      nav#navMenu {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        width: 100%;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        background: var(--card-bg);
        border-radius: 0.5rem;
        box-shadow: 0 8px 20px rgba(0,0,0,0.25);
        margin-top: 0.5rem;
        padding: 0 1rem;
        transition: max-height 0.5s ease, opacity 0.5s ease, padding 0.5s ease;
      }
      nav#navMenu.active {
        max-height: 350px;
        opacity: 1;
        padding: 1rem 1rem;
      }
      nav#navMenu a {
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--bg);
        font-weight: 600;
        color: var(--card-text);
        text-align: center;
        transition: color 0.3s ease;
      }
      nav#navMenu a:nth-last-child(-n+2) {
        border-bottom: none;
      }
      nav#navMenu a:hover {
        color: var(--accent);
      }

  main {
    padding: 1rem;
    margin-top: 60px;
  }

  .container {
    padding: 1.5rem 1rem;
    width: 100%;
  }

  h2 {
    font-size: 1.5rem;
  }

  #password {
    font-size: 1rem;
  }

  #generate,
  #copy {
    width: 100%;
    box-sizing: border-box;
  }

  .output {
    flex-direction: column;
    gap: 0.5rem;
  }

  input[type="number"] {
    width: 100%;
    max-width: 80px;
  }

  #themeToggle {
    bottom: 0.5rem;
    right: 0.5rem;
    padding: 0.3rem 0.8rem;
    font-size: 0.9rem;
    z-index: 1000;
  }

  #hamburger {
    display: block;
  }
}