:root {
    --dk-violet: hsl(220, 40%, 12%);
    --lt-violet: hsl(220, 35%, 20%);
    --lt-violet2: hsl(220, 45%, 25%);
    --vb-violet: hsl(200, 98%, 39%);
    --vb-violet2: hsl(200, 70%, 35%);
    --vb-yellow: hsl(45, 100%, 65%);
    --pl-white: hsl(0, 0%, 95%);
    --vb-cyan: hsl(170, 100%, 50%);
    --vb-cyan2: hsl(170, 80%, 60%);
    --dk-text: hsl(220, 20%, 10%);
    --success: hsl(145, 63%, 42%);
    --warning: hsl(35, 100%, 50%);
    --danger: hsl(0, 78%, 62%);
    --accent: hsl(280, 65%, 60%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'League Spartan', sans-serif;
}

html {
    font-size: 62.5%;
}

body {
    font-size: 1.6rem;
    background: linear-gradient(135deg, 
                hsl(220, 50%, 15%) 0%, 
                hsl(250, 45%, 20%) 50%, 
                hsl(280, 40%, 25%) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    position: relative;
    overflow-x: hidden;
}

/* Fixed animated background elements */
body::before {
    content: '';
    position: fixed; /* Changed from absolute to fixed */
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(120, 119, 198, 0.1) 0%, transparent 70%);
    animation: float 20s infinite linear;
    z-index: -1;
}

body::after {
    content: '';
    position: fixed; /* Changed from absolute to fixed */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(100, 119, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(200, 100, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 200, 100, 0.08) 0%, transparent 50%);
    z-index: -1;
}

@keyframes float {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Wrapper and Container */
.wrapper {
    width: 100%;
    max-width: 50rem;
    animation: slideUp 0.8s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container {
    background: linear-gradient(145deg, var(--dk-violet), hsl(220, 45%, 15%));
    border-radius: 2rem;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(10px);
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--vb-cyan), 
        var(--accent), 
        var(--vb-cyan), 
        transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Header */
header {
    padding: 3rem 3rem 1.5rem;
    text-align: center;
    position: relative;
}

.app-name {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--pl-white);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.app-name .material-icons {
    font-size: 3.2rem;
    color: var(--vb-cyan);
    filter: drop-shadow(0 0 8px rgba(100, 255, 218, 0.4));
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.app-description {
    font-size: 1.6rem;
    color: var(--pl-white);
    opacity: 0.8;
    line-height: 1.5;
    font-weight: 300;
}

/* Display Container */
.display-container {
    padding: 2rem 3rem;
    background: linear-gradient(135deg, var(--lt-violet), hsl(220, 40%, 18%));
    margin: 0 2rem 2rem;
    border-radius: 1.5rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
}

.password-display-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, hsl(220, 45%, 15%), hsl(220, 40%, 12%));
    border-radius: 1rem;
    overflow: hidden;
    border: 2px solid var(--lt-violet2);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.display {
    width: 100%;
    padding: 1.5rem 2rem;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--vb-yellow);
    background: transparent;
    border: none;
    outline: none;
    letter-spacing: 1px;
    text-shadow: 0 0 10px rgba(255, 193, 7, 0.3);
}

.display::placeholder {
    color: var(--vb-yellow);
    opacity: 0.6;
}

.refresh-btn {
    background: transparent;
    border: none;
    padding: 1rem;
    cursor: pointer;
    color: var(--vb-cyan);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
}

.refresh-btn:hover {
    color: var(--vb-yellow);
    background: rgba(100, 255, 218, 0.1);
    transform: rotate(180deg);
    box-shadow: 0 0 15px rgba(100, 255, 218, 0.3);
}

.copy-btn {
    background: linear-gradient(135deg, var(--vb-violet), var(--vb-violet2));
    border: none;
    border-radius: 1rem;
    padding: 1.5rem;
    cursor: pointer;
    color: var(--pl-white);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.copy-btn:hover {
    background: linear-gradient(135deg, var(--vb-violet2), var(--vb-violet));
    transform: translateY(-2px);
    box-shadow: 
        0 6px 20px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

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

.copy-tooltip {
    position: absolute;
    top: -4.5rem;
    left: 50%;
    transform: translateX(-50%) scale(0);
    background: linear-gradient(135deg, var(--accent), hsl(280, 60%, 50%));
    color: var(--pl-white);
    font-size: 1.4rem;
    font-weight: 600;
    padding: 0.8rem 1.5rem;
    border-radius: 1rem;
    transition: all 0.3s ease;
    opacity: 0;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.copy-tooltip.active {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

/* Input Container */
.input-container {
    padding: 0 3rem 3rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.option-section {
    background: linear-gradient(135deg, var(--lt-violet), hsl(220, 40%, 18%));
    padding: 2rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 
        inset 0 1px 3px rgba(0, 0, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.option-section:hover {
    transform: translateY(-2px);
}

.option-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.option-header h3 {
    font-size: 1.8rem;
    color: var(--pl-white);
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.option-header .material-icons {
    color: var(--vb-cyan);
    font-size: 2.4rem;
    filter: drop-shadow(0 0 6px rgba(100, 255, 218, 0.3));
}

/* Length Container */
.length-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.length-value {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.length-value span:first-child {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--vb-yellow);
    text-shadow: 0 0 10px rgba(255, 193, 7, 0.3);
}

.characters {
    font-size: 1.2rem;
    color: var(--pl-white);
    opacity: 0.7;
    font-weight: 300;
}

/* Slider */
.slider {
    appearance: none;
    width: 100%;
    height: 0.8rem;
    border-radius: 1rem;
    background: linear-gradient(90deg, 
        var(--vb-cyan) 0%, 
        var(--accent) 50%, 
        var(--vb-violet) 100%);
    outline: none;
    cursor: pointer;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--vb-yellow), hsl(45, 90%, 55%));
    cursor: pointer;
    box-shadow: 
        0 0 20px rgba(255, 193, 7, 0.5),
        0 4px 12px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.8);
}

.slider::-webkit-slider-thumb:hover {
    background: linear-gradient(135deg, var(--vb-cyan), hsl(170, 90%, 55%));
    transform: scale(1.1);
    box-shadow: 
        0 0 25px rgba(100, 255, 218, 0.7),
        0 6px 16px rgba(0, 0, 0, 0.4);
}

.slider::-moz-range-thumb {
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--vb-yellow), hsl(45, 90%, 55%));
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 
        0 0 20px rgba(255, 193, 7, 0.5),
        0 4px 12px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.slider::-moz-range-thumb:hover {
    background: linear-gradient(135deg, var(--vb-cyan), hsl(170, 90%, 55%));
    transform: scale(1.1);
    box-shadow: 
        0 0 25px rgba(100, 255, 218, 0.7),
        0 6px 16px rgba(0, 0, 0, 0.4);
}

/* Checkboxes */
.checkbox-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
}

.checkbox-container input[type="checkbox"] {
    display: none;
}

.checkbox-container label {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.6rem;
    color: var(--pl-white);
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0.8rem 1rem;
    border-radius: 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
}

.checkbox-container label:hover {
    background: rgba(100, 255, 218, 0.1);
    border-color: rgba(100, 255, 218, 0.3);
    transform: translateX(5px);
}

.checkbox-container .material-icons {
    font-size: 2.2rem;
    color: var(--vb-cyan2);
    transition: all 0.3s ease;
}

.checkbox-container input[type="checkbox"]:checked + label {
    background: linear-gradient(135deg, 
        rgba(100, 255, 218, 0.15), 
        rgba(120, 119, 198, 0.1));
    border-color: var(--vb-cyan);
    box-shadow: 0 0 15px rgba(100, 255, 218, 0.2);
}

.checkbox-container input[type="checkbox"]:checked + label .material-icons {
    color: var(--vb-cyan);
    filter: drop-shadow(0 0 8px rgba(100, 255, 218, 0.5));
}

/* Strength Container */
.strength-display {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.strength-text {
    font-size: 1.6rem;
    font-weight: 600;
    text-align: center;
    padding: 0.8rem 1.5rem;
    border-radius: 0.8rem;
    background: linear-gradient(135deg, hsl(220, 45%, 15%), hsl(220, 40%, 12%));
    color: var(--pl-white);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.strength-bar {
    height: 1rem;
    background: linear-gradient(135deg, hsl(220, 45%, 15%), hsl(220, 40%, 12%));
    border-radius: 1rem;
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.indicator {
    height: 100%;
    width: 50%;
    border-radius: 1rem;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: linear-gradient(90deg, 
        var(--danger), 
        var(--warning), 
        var(--success));
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 2rem;
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--vb-violet), var(--accent));
    color: var(--pl-white);
    border: none;
    border-radius: 1.5rem;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    border-bottom: 0.4rem solid var(--vb-violet2);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    box-shadow: 
        0 8px 25px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    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 {
    background: linear-gradient(135deg, var(--accent), var(--vb-violet));
    transform: translateY(-4px);
    box-shadow: 
        0 12px 35px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

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

.generate-btn:active {
    transform: translateY(-1px);
    border-bottom-width: 0.2rem;
}

.generate-btn .material-icons {
    font-size: 2.2rem;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
    transition: transform 0.3s ease;
}

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

/* Media Queries */
@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .app-name {
        font-size: 2.4rem;
    }
    
    .display-container {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .password-display-wrapper {
        width: 100%;
    }
    
    .copy-btn {
        width: 100%;
    }
    
    .input-container {
        padding: 0 2rem 2rem;
    }
    
    .option-section {
        padding: 1.5rem;
    }
}

@media (max-width: 350px) {
    .app-name {
        font-size: 2rem;
    }
    
    .display {
        font-size: 1.6rem;
    }
    
    .option-header h3 {
        font-size: 1.6rem;
    }
    
    .checkbox-container label {
        font-size: 1.4rem;
    }
    
    .generate-btn {
        font-size: 1.6rem;
        padding: 1.8rem;
    }
}