/* ===================================================
   Password Generator — style.css
   Dark SaaS theme | Solid colors only | Responsive
   =================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

/* ── Reset & Base ───────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-page:       #0d1117;
  --bg-card:       #161b22;
  --bg-input:      #0d1117;
  --bg-section:    #1c2230;
  --bg-btn:        #2563eb;
  --bg-btn-hover:  #1d4ed8;
  --bg-copy:       #1e2d40;
  --bg-copy-hover: #1d3a55;

  --border:        #30363d;
  --border-focus:  #2563eb;

  --text-primary:  #e6edf3;
  --text-secondary:#8b949e;
  --text-muted:    #484f58;
  --text-mono:     #58a6ff;

  --strength-weak:   #f85149;
  --strength-fair:   #e3b341;
  --strength-good:   #3fb950;
  --strength-strong: #58a6ff;

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
  --transition:  0.18s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

/* ── Page Header ────────────────────────────────────── */
.page-header {
  text-align: center;
  margin-bottom: 32px;
}

.page-header .logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-header .logo-icon {
  width: 40px;
  height: 40px;
  background-color: var(--bg-btn);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.page-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.4px;
}

.page-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ── Card ───────────────────────────────────────────── */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 480px;
  padding: 32px 28px;
  animation: fadeInUp 0.35s ease both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Section Label ──────────────────────────────────── */
.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* ── Password Display ───────────────────────────────── */
.password-row {
  display: flex;
  align-items: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 8px;
  transition: border-color var(--transition);
}

.password-row:focus-within {
  border-color: var(--border-focus);
}

#passwordDisplay {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 14px 16px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-mono);
  letter-spacing: 0.04em;
  cursor: text;
}

#passwordDisplay::placeholder {
  color: var(--text-muted);
  font-weight: 400;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0;
}

.copy-btn {
  background-color: var(--bg-copy);
  border: none;
  border-left: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0 18px;
  height: 100%;
  min-height: 50px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: 'Inter', sans-serif;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.copy-btn:hover {
  background-color: var(--bg-copy-hover);
  color: var(--text-primary);
}

.copy-btn.copied {
  color: #3fb950;
}

.copy-btn svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* ── Strength Indicator ─────────────────────────────── */
.strength-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}

.strength-bars {
  display: flex;
  gap: 4px;
  flex: 1;
}

.strength-bar {
  height: 4px;
  flex: 1;
  background-color: var(--bg-section);
  border-radius: 99px;
  transition: background-color 0.25s ease;
}

.strength-label {
  font-size: 0.75rem;
  font-weight: 600;
  min-width: 48px;
  text-align: right;
  transition: color 0.25s ease;
  color: var(--text-muted);
}

/* Strength states applied via JS */
.strength-0 .strength-label { color: var(--text-muted); }
.strength-1 .strength-label { color: var(--strength-weak); }
.strength-2 .strength-label { color: var(--strength-fair); }
.strength-3 .strength-label { color: var(--strength-good); }
.strength-4 .strength-label { color: var(--strength-strong); }

/* ── Divider ────────────────────────────────────────── */
.divider {
  height: 1px;
  background-color: var(--border);
  margin: 24px 0;
}

/* ── Length Slider ──────────────────────────────────── */
.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.slider-header .label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

#lengthValue {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-mono);
  background-color: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  min-width: 36px;
  text-align: center;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 5px;
  background-color: var(--bg-section);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
  margin-bottom: 4px;
  border: 1px solid var(--border);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--bg-btn);
  border: 2px solid var(--bg-card);
  box-shadow: 0 0 0 2px var(--bg-btn);
  cursor: pointer;
  transition: box-shadow var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.25);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--bg-btn);
  border: 2px solid var(--bg-card);
  box-shadow: 0 0 0 2px var(--bg-btn);
  cursor: pointer;
}

.slider-bounds {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── Checkboxes ─────────────────────────────────────── */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 24px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition);
  user-select: none;
}

.checkbox-item:hover {
  border-color: var(--border-focus);
}

.checkbox-item input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border);
  border-radius: 4px;
  background-color: var(--bg-input);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background-color var(--transition), border-color var(--transition);
}

.checkbox-item input[type="checkbox"]:checked {
  background-color: var(--bg-btn);
  border-color: var(--bg-btn);
}

.checkbox-item input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 5px;
  height: 9px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.checkbox-item .cb-text {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.checkbox-item:has(input:checked) {
  border-color: rgba(37, 99, 235, 0.5);
  background-color: rgba(37, 99, 235, 0.07);
}

.checkbox-item:has(input:checked) .cb-text {
  color: var(--text-primary);
}

.cb-badge {
  margin-left: auto;
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ── Generate Button ────────────────────────────────── */
.generate-btn {
  width: 100%;
  background-color: var(--bg-btn);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 14px 20px;
  cursor: pointer;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.generate-btn:hover {
  background-color: var(--bg-btn-hover);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.generate-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.generate-btn svg {
  width: 16px;
  height: 16px;
}

/* ── Toast ──────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background-color: #1c2230;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #3fb950;
  flex-shrink: 0;
}

/* ── Flash animation on new password ───────────────── */
@keyframes flash {
  0%   { opacity: 0.3; }
  100% { opacity: 1; }
}

#passwordDisplay.flash {
  animation: flash 0.28s ease-out both;
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 520px) {
  .card {
    padding: 24px 18px;
  }

  .options-grid {
    grid-template-columns: 1fr;
  }

  .page-header h1 {
    font-size: 1.45rem;
  }
}