/* =====================================================
   RESET & GLOBAL
===================================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Arial, sans-serif;
  background: #f0f2f5;
  line-height: 1.5;
}

/* =====================================================
   WRAPPER
===================================================== */
.password-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* =====================================================
   CONTAINER
===================================================== */
.password-generator-container {
  width: 100%;
  max-width: 520px;
  margin: 20px auto;
  background-color: #ffffff;
  padding: 28px 24px;
  border-radius: 14px;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.12);
}

/* =====================================================
   TITLE
===================================================== */
.password-generator-container h1 {
  text-align: center;
  color: #333333;
  margin-bottom: 26px;
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 700;
}

/* =====================================================
   PASSWORD DISPLAY
===================================================== */
.password-display {
  background-color: #f7f7f7;
  padding: 14px 16px;
  border: 1px solid #dddddd;
  border-radius: 10px;
  margin-bottom: 20px;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.password-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(14px, 4vw, 18px);
  color: #333333;
  word-break: break-all;
}

/* =====================================================
   COPY BUTTON
===================================================== */
.copy-btn {
  background-color: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  position: relative;
}

.copy-btn svg {
  width: 20px;
  height: 20px;
}

/* =====================================================
   STRENGTH METER
===================================================== */
.strength-text {
  text-align: right;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 14px;
  color: #444;
}

.strength-meter {
  height: 10px;
  background-color: #dddddd;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 24px;
}

.strength-meter-fill {
  height: 100%;
  width: 30%;
  border-radius: 6px;
  transition: width 0.3s ease, background-color 0.3s ease;
}

/* =====================================================
   OPTIONS
===================================================== */
.password-options {
  margin-bottom: 24px;
}

.option-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.option-item label {
  font-size: 15px;
  color: #555555;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

/* =====================================================
   LENGTH SLIDER
===================================================== */
.length-value {
  font-weight: 700;
  color: #333333;
}

input[type="range"] {
  width: 100%;
  margin: 12px 0;
  height: 6px;
  background: #dddddd;
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #003049;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  background: #001520;
}

input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: #003049;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  background: #001520;
}

/* ====================================================
   CUSTOM CHECKBOX
===================================================== */
input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid #003049;
  border-radius: 5px;
  cursor: pointer;
  position: relative;
  transition: background-color 0.25s, border-color 0.25s;
}

input[type="checkbox"]:checked {
  background-color: #003049;
  border-color: #003049;
}

input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 6px;
  border: 2px solid #ffffff;
  border-top: none;
  border-right: none;
  transform: translate(-50%, -60%) rotate(-45deg);
}

input[type="checkbox"]:hover {
  border-color: #001520;
}

/* =====================================================
   GENERATE BUTTON
===================================================== */
.generate-btn {
  width: 100%;
  padding: 14px;
  background-color: #003049;
  color: #ffffff;
  border-radius: 8px;
  border: none;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.generate-btn:hover {
  background-color: #001520;
}

.generate-btn:active {
  transform: translateY(1px);
}

/* =====================================================
   TOOLTIP
===================================================== */
.tooltip {
  position: absolute;
  right: 0;
  bottom: 110%;
  background-color: #333333;
  padding: 6px 10px;
  color: #ffffff;
  border-radius: 6px;
  font-size: 12px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
  white-space: nowrap;
  z-index: 10;
}

.tooltip.visible {
  opacity: 1;
}

/* =====================================================
   SMALL SCREENS (≤ 480px)
===================================================== */
@media (max-width: 480px) {
  .password-generator-container {
    padding: 22px 18px;
  }

  .option-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .strength-text {
    text-align: left;
  }
}