/* ──────────────────────────────────────────
   Password Generator – Brand-Matched Styles
   ────────────────────────────────────────────── */
:root {
  /* Brand colours */
  --primary: #2190b0;
  --primary-hover: #1a8bcd;
  --primary-active: #13759c;
  --primary-rgb: 33, 144, 176;

  /* Light theme */
  --bg: #fffdf6;
  --surface: #ffffff;
  --surface-2: #f5f6f4;
  --text: #182628;
  --text-muted: #4f6b77;
  --border: #e0e2e2;

  /* Radius & shadows */
  --r-sm: .5rem;
  --r-md: .75rem;
  --r-lg: 1rem;
  --sh-sm: 0 1px 2px rgba(0,0,0,.05);
  --sh-lg: 0 10px 15px -3px rgba(0,0,0,.12);
  font-family: "Inter",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
}

/* Dark mode overrides */
@media (prefers-color-scheme: dark){
  :root{
    --bg:#1f2121; 
    --surface:#262828; 
    --surface-2:#303232;
    --text:#f8fafc; 
    --text-muted:#a0a8b0; 
    --border:#334155;
    --sh-sm:0 1px 2px rgba(0,0,0,.4); 
    --sh-lg:0 10px 15px -3px rgba(0,0,0,.5);
  }
}

/* Base reset */
*{margin:0;padding:0;box-sizing:border-box}
body{
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

/* ======================================
   Particle Effects & Scroll Animations
   ====================================== */

/* Particles Container */
.particles-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  opacity: 0.6;
}

/* Scroll animations base */
[data-scroll-animation] {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-scroll-animation].scroll-animated {
  opacity: 1;
  transform: translateY(0);
}

/* Performance optimizations */
.particles-canvas {
  will-change: transform;
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Header */
.header{
  background:var(--surface);
  border-bottom:1px solid var(--border);
  padding:1rem 0;
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.header-content{
  max-width:72rem;
  margin:auto;
  padding:0 1.5rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.brand-link{
  display:flex;
  align-items:center;
  gap:.75rem;
  text-decoration:none;
  color:inherit;
  transition: color 0.25s ease;
}
.brand-link:hover{color:var(--primary)}
.brand-text{font-size:1.25rem;font-weight:600;letter-spacing:.02em}
.nav{display:flex;gap:1.25rem}
.nav-link{
  font-size:.875rem;
  color:var(--text-muted);
  text-decoration:none;
  transition: color 0.25s ease;
}
.nav-link:hover{color:var(--primary)}

/* logo fix */
img.logo, .brand-link img{height:2.5rem;width:auto}

/* Main layout */
.main{flex:1;padding:3rem 0}
.container{max-width:48rem;margin:auto;padding:0 1.5rem}
.tool-header{text-align:center;margin-bottom:3rem}
.tool-title{font-size:2.25rem;font-weight:700;margin-bottom:1rem}
.tool-description{font-size:1.125rem;color:var(--text-muted)}

/* Card */
.password-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  box-shadow:var(--sh-sm);
  padding:2rem;
  margin-bottom:2rem;
  position: relative;
  overflow: hidden;
}

.password-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 70% 20%, rgba(var(--primary-rgb), 0.03) 0%, transparent 60%);
  pointer-events: none;
}

.password-section {
  position: relative;
  z-index: 1;
}

.password-label{font-size:.875rem;font-weight:600;margin-bottom:.5rem;display:block}
.password-output{display:flex;gap:.5rem}
.password-input{
  flex:1;
  padding:.875rem 1rem;
  font:1rem/1.4 "Menlo",monospace;
  background:var(--surface-2);
  border:2px solid var(--border);
  border-radius:var(--r-md);
  letter-spacing:.05em;
  transition: all 0.25s ease;
}
.password-input:focus{
  outline:none;
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(var(--primary-rgb),.15);
}
.copy-btn{
  background:var(--primary);
  border:none;
  color:#fff;
  border-radius:var(--r-md);
  padding:.875rem 1rem;
  cursor:pointer;
  display:flex;
  align-items:center;
  transition: all 0.25s ease;
}
.copy-btn:hover{
  background:var(--primary-hover);
  transform: translateY(-1px);
}
.copy-btn:active{
  transform: scale(0.95);
}
.copy-icon{width:1.25rem;height:1.25rem}

/* Controls */
.controls-section{
  display:flex;
  flex-direction:column;
  gap:1.5rem;
  margin-top:1.5rem;
  position: relative;
  z-index: 1;
}
.control-label{font-size:.875rem;font-weight:600}
.slider-container{display:flex;align-items:center;gap:1rem}
.slider{
  flex:1;
  height:.5rem;
  border-radius:var(--r-sm);
  appearance:none;
  background:var(--surface-2);
  outline: none;
  cursor: pointer;
  transition: all 0.25s ease;
}
.slider::-webkit-slider-thumb{
  appearance:none;
  width:1.25rem;
  height:1.25rem;
  border-radius:50%;
  background:var(--primary);
  cursor:pointer;
  transition: all 0.25s ease;
}
.slider::-webkit-slider-thumb:hover{
  background:var(--primary-hover);
  transform: scale(1.1);
}
.slider::-moz-range-thumb{
  width:1.25rem;
  height:1.25rem;
  border-radius:50%;
  background:var(--primary);
  cursor:pointer;
  border: none;
  transition: all 0.25s ease;
}
.slider::-moz-range-thumb:hover{
  background:var(--primary-hover);
  transform: scale(1.1);
}
.slider-value{font-weight:600;color:var(--primary);min-width: 2rem;text-align: center;}

.checkbox-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}
.checkbox-item{
  display:flex;
  align-items:center;
  gap:.75rem;
  cursor:pointer;
  padding:.5rem;
  border-radius:var(--r-sm);
  transition: all 0.25s ease;
}
.checkbox-item:hover{background:var(--surface-2)}
.checkbox-item input{display:none}
.checkmark{
  width:1.25rem;
  height:1.25rem;
  border:2px solid var(--border);
  border-radius:var(--r-sm);
  flex-shrink:0;
  position:relative;
  transition: all 0.25s ease;
}
.checkbox-item input:checked + .checkmark{
  background:var(--primary);
  border-color:var(--primary);
}
.checkbox-item input:checked + .checkmark::after{
  content:'';
  position:absolute;
  left:.25rem;
  top:.125rem;
  width:.35rem;
  height:.6rem;
  border:solid #fff;
  border-width:0 2px 2px 0;
  transform:rotate(45deg);
}
.checkbox-label{font-size:.875rem}

/* Generate button */
.generate-btn{
  background:linear-gradient(135deg,var(--primary)0%,var(--primary-active)100%);
  color:#fff;
  border:none;
  border-radius:var(--r-md);
  padding:1rem 2rem;
  font-size:1rem;
  font-weight:600;
  cursor:pointer;
  display:flex;
  align-items:center;
  gap:.5rem;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.generate-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.6s;
}

.generate-btn:hover {
  opacity:.95;
  transform:translateY(-2px);
  box-shadow:var(--sh-lg);
}

.generate-btn:hover::before {
  left: 100%;
}

.generate-btn:active {
  transform: translateY(0) scale(0.98);
}

.generate-icon{width:1.25rem;height:1.25rem}

/* Info block */
.security-info{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:1.5rem;
  position: relative;
  overflow: hidden;
}

.security-info::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 80%, rgba(var(--primary-rgb), 0.02) 0%, transparent 60%);
  pointer-events: none;
}

.info-title{font-size:1.125rem;font-weight:600;margin-bottom:1rem;position: relative;z-index: 1;}
.info-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:1rem;
  position: relative;
  z-index: 1;
}
.info-item{font-size:.875rem;color:var(--text-muted)}
.info-item strong{color:var(--text)}

/* Footer */
.footer{
  background:var(--surface);
  border-top:1px solid var(--border);
  padding:1.5rem 0;
  text-align:center;
  font-size:.875rem;
  color:var(--text-muted);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Toast */
.toast{
  position:fixed;
  bottom:2rem;
  right:2rem;
  background:var(--primary);
  color:#fff;
  padding:.875rem 1.25rem;
  border-radius:var(--r-md);
  opacity:0;
  transform:translateY(2rem);
  pointer-events:none;
  transition:all .3s;
  box-shadow: var(--sh-lg);
  z-index: 1000;
}
.toast.show{
  opacity:1;
  transform:translateY(0);
}

/* Mobile tweaks */
@media(max-width:768px){
  .container{padding:0 1rem}
  .password-card{padding:1.5rem}
  .checkbox-grid{grid-template-columns:1fr}
  .particles-container {
    opacity: 0.4;
  }
  [data-scroll-animation] {
    transform: translateY(20px);
  }
}

@media(max-width:480px){
  .tool-title{font-size:1.75rem}
  .password-output{flex-direction:column}
  .copy-btn{width:100%;justify-content: center;}
  .slider-container{flex-direction: column;align-items: stretch;gap: 0.5rem;}
  .slider-value{text-align: left;margin-top: 0.5rem;}
  .toast{
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
    right: 1rem;
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  [data-scroll-animation],
  .tool-card,
  .particles-container,
  .generate-btn,
  .copy-btn,
  .slider::-webkit-slider-thumb,
  .slider::-moz-range-thumb {
    animation: none !important;
    transition: none !important;
  }
  
  .particles-container {
    display: none;
  }
}