:root {
  --bg-color: #0d1117;
  --panel-bg: #161b22;
  --card-bg: #1c2128;
  --border-color: #30363d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --accent-color: #58a6ff;
  
  --str-weak: #f85149;
  --str-fair: #d29922;
  --str-good: #3fb950;
  --str-strong: #bc8cff;

  --font-sans: 'Inter', -apple-system, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
}

.code-font { font-family: var(--font-mono); }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.text-center { text-align: center; }
.highlight { color: var(--accent-color); font-weight: bold;}

header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 2rem;
}

.header-left h1 { font-size: 1.5rem; font-weight: 600; margin-top: 0.5rem; }
.header-right p { color: var(--text-secondary); font-size: 0.875rem; }

.back-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
  display: inline-block;
  margin-bottom: 0.5rem;
}
.back-link:hover { color: var(--accent-color); }

.main-content {
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
}

/* Generator specifically */
.password-display-wrapper {
  display: flex;
  gap: 0.5rem;
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  align-items: center;
}
.password-display-wrapper:focus-within {
  border-color: var(--accent-color);
}

#password-display {
  flex-grow: 1;
  background: transparent;
  border: none;
  color: var(--accent-color);
  font-size: 1.5rem;
  outline: none;
  padding: 0.5rem;
  letter-spacing: 2px;
  text-align: center;
}

.square-btn {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 48px;
  height: 48px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.square-btn:hover { background-color: var(--panel-bg); border-color: var(--accent-color); color: var(--accent-color); }
.square-btn.success { background-color: rgba(63, 185, 80, 0.1); border-color: var(--str-good); color: var(--str-good); }

/* Strength Meter */
.strength-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.strength-bars {
  display: flex;
  gap: 0.5rem;
  height: 8px;
}
.bar {
  flex-grow: 1;
  background-color: var(--panel-bg);
  border-radius: 4px;
  transition: background-color 0.3s;
}

.crack-time p { color: var(--text-secondary); font-size: 0.9rem; }
.crack-time strong { color: #fff; }

/* Controls */
.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  background-color: var(--panel-bg);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}
.full-width { grid-column: span 2; }

.control-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: #fff;
}

input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; background: transparent; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; height: 20px; width: 20px; border-radius: 50%; background: var(--accent-color); cursor: pointer; margin-top: -8px; }
input[type=range]::-webkit-slider-runnable-track { width: 100%; height: 4px; cursor: pointer; background: var(--border-color); border-radius: 2px; }

/* Custom Checkbox */
.checkbox-container {
  display: flex;
  position: relative;
  padding-left: 30px;
  cursor: pointer;
  user-select: none;
  align-items: center;
  font-weight: normal !important;
  color: var(--text-secondary) !important;
}

.checkbox-container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.checkmark {
  position: absolute;
  left: 0;
  height: 20px;
  width: 20px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  transition: 0.2s;
}

.checkbox-container:hover input ~ .checkmark { border-color: var(--accent-color); }
.checkbox-container input:checked ~ .checkmark { background-color: var(--accent-color); border-color: var(--accent-color); }

.checkmark:after {
  content: "";
  position: absolute;
  display: none;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.checkbox-container input:checked ~ .checkmark:after { display: block; }
.checkbox-container input:checked ~ span { color: #fff !important; }

/* Edu card */
.education-section h2 { border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; margin-bottom: 1.5rem; }
.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
@media(max-width: 768px) { .info-grid { grid-template-columns: 1fr; } .controls-grid { grid-template-columns: 1fr; } .full-width { grid-column: span 1;} }
.info-block h3 { font-size: 1rem; color: #fff; margin-bottom: 0.5rem; }
.info-block p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; }
.info-block code { background-color: rgba(255,255,255,0.1); padding: 0.2rem 0.4rem; border-radius: 4px; font-family: var(--font-mono); color: var(--accent-color); }