/* ===== PassGen — Modern Glassmorphism UI ===== */
:root {
  --bg: #0a0a0f;
  --bg-2: #12121a;
  --glass: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --text: #f0f0f5;
  --text-dim: #8a8a9a;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --accent-grad: linear-gradient(135deg, #7c5cff 0%, #00d4ff 100%);
  --danger: #ff4d6d;
  --warn: #ffb84d;
  --ok: #4dff88;
  --radius: 18px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow-x: hidden;
  position: relative;
}

/* Animated background orbs */
.bg-orbs {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  will-change: transform;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: float 18s ease-in-out infinite;
}

.orb-1 {
  width: 420px; height: 420px;
  background: #7c5cff;
  top: -120px; left: -100px;
}

.orb-2 {
  width: 380px; height: 380px;
  background: #00d4ff;
  bottom: -140px; right: -80px;
  animation-delay: -6s;
}

.orb-3 {
  width: 300px; height: 300px;
  background: #ff4d8d;
  top: 40%; left: 60%;
  animation-delay: -12s;
  opacity: 0.3;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(40px, -30px) scale(1.08); }
  66%      { transform: translate(-30px, 40px) scale(0.95); }
}

/* Mouse-following glow */
.mouse-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 600px;
  height: 600px;
  margin: -300px 0 0 -300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.18) 0%, rgba(0, 212, 255, 0.08) 35%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.4s ease;
  will-change: transform;
}

.mouse-glow.active {
  opacity: 1;
}

/* Container */
.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 480px;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 28px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 2rem;
  filter: drop-shadow(0 0 12px rgba(124, 92, 255, 0.6));
}

.logo h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.accent {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-top: 6px;
  font-weight: 400;
}

/* Glass card */
.glass {
  background: var(--glass);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  padding: 28px;
}

/* Password display */
.password-display {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color 0.25s, box-shadow 0.25s;
  min-height: 64px;
}

.password-display:hover {
  border-color: rgba(124, 92, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.1);
}

.password-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.15rem;
  font-weight: 500;
  word-break: break-all;
  flex: 1;
  letter-spacing: 0.02em;
  color: var(--text);
  transition: opacity 0.2s;
}

.password-text.empty {
  color: var(--text-dim);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 400;
}

.copy-btn {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.copy-btn:hover {
  color: var(--accent-2);
  background: rgba(0, 212, 255, 0.1);
}

.copy-btn.copied {
  color: var(--ok);
}

/* Strength meter */
.strength {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.strength-bar {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 99px;
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  width: 0%;
  border-radius: 99px;
  transition: width 0.4s ease, background 0.4s ease;
  background: var(--danger);
}

.strength-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  min-width: 70px;
  text-align: right;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Controls */
.control-group {
  margin-top: 24px;
}

.control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.control-header label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.value-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-2);
  background: rgba(0, 212, 255, 0.1);
  padding: 3px 12px;
  border-radius: 99px;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

/* Slider */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-grad);
  cursor: pointer;
  border: 3px solid var(--bg-2);
  box-shadow: 0 0 12px rgba(124, 92, 255, 0.5);
  transition: transform 0.15s;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #7c5cff;
  cursor: pointer;
  border: 3px solid var(--bg-2);
  box-shadow: 0 0 12px rgba(124, 92, 255, 0.5);
}

/* Options */
.options {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}

.toggle input {
  display: none;
}

.toggle-track {
  width: 44px;
  height: 26px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--glass-border);
  position: relative;
  transition: background 0.25s;
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform 0.25s, background 0.25s;
}

.toggle input:checked + .toggle-track {
  background: rgba(124, 92, 255, 0.3);
  border-color: rgba(124, 92, 255, 0.4);
}

.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(18px);
  background: var(--accent);
}

.toggle-label {
  font-size: 0.9rem;
  color: var(--text);
  font-weight: 400;
}

/* Generate button */
.generate-btn {
  width: 100%;
  margin-top: 28px;
  padding: 16px;
  border: none;
  border-radius: 14px;
  background: var(--accent-grad);
  color: white;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: transform 0.15s, box-shadow 0.25s, opacity 0.2s;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
  position: relative;
  overflow: hidden;
}

.generate-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(124, 92, 255, 0.45);
}

.generate-btn:hover::before {
  opacity: 1;
}

.generate-btn:active {
  transform: translateY(0);
}

.generate-btn svg {
  transition: transform 0.5s;
}

.generate-btn:hover svg {
  transform: rotate(180deg);
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 28px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer a {
  color: var(--accent-2);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}

.footer a:hover { opacity: 0.8; }

.footer-note {
  margin-top: 8px;
  font-size: 0.78rem;
  opacity: 0.7;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(20, 20, 28, 0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  color: var(--ok);
  padding: 12px 24px;
  border-radius: 99px;
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 100;
  pointer-events: none;
  box-shadow: var(--shadow);
}

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

/* Responsive */
@media (max-width: 520px) {
  .card { padding: 22px; }
  .logo h1 { font-size: 1.8rem; }
  .password-text { font-size: 1rem; }
}

/* Fade-in animation */
.card, .header, .footer {
  animation: fadeUp 0.6s ease both;
}

.footer { animation-delay: 0.15s; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Light theme ===== */
body.light {
  --bg: #eef1f8;
  --bg-2: #ffffff;
  --glass: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(0, 0, 0, 0.08);
  --text: #1a1a2e;
  --text-dim: #5a5a72;
  --shadow: 0 20px 60px rgba(60, 60, 120, 0.15);
}

body.light .orb { opacity: 0.25; }

body.light .password-display {
  background: rgba(0, 0, 0, 0.04);
}

body.light .strength-bar {
  background: rgba(0, 0, 0, 0.08);
}

body.light .toggle-track {
  background: rgba(0, 0, 0, 0.08);
}

body.light .slider {
  background: rgba(0, 0, 0, 0.1);
}

body.light .toast {
  background: rgba(255, 255, 255, 0.95);
}

body.light .mouse-glow {
  background: radial-gradient(circle, rgba(124, 92, 255, 0.12) 0%, rgba(0, 212, 255, 0.06) 35%, transparent 70%);
}

/* ===== Theme toggle button ===== */
.theme-toggle {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.theme-toggle:hover {
  transform: scale(1.1);
  border-color: rgba(124, 92, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.1);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

body.light .theme-toggle .icon-sun { display: block; }
body.light .theme-toggle .icon-moon { display: none; }