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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #141938;
    --bg-card: #1a1f3a;
    --accent-primary: #00d4ff;
    --accent-secondary: #0091ff;
    --text-primary: #e8eaed;
    --text-secondary: #a0a8b8;
    --border: rgba(0, 212, 255, 0.2);
    --success: #00ff88;
}

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

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 1rem 2rem 2rem;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 145, 255, 0.05) 0%, transparent 50%);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    text-align: center;
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
}

.control-group {
    margin-bottom: 0;
}

.control-chartype {
    grid-column: 1 / -1;
}

.control-length {
    order: 1;
}

.control-symbol {
    order: 2;
    align-self: end;
}

label.control-label {
    display: block;
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.length-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
    transition: transform 0.2s;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.length-value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--accent-primary);
    min-width: 3rem;
    text-align: center;
}

.radio-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.radio-option {
    position: relative;
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.radio-option:hover {
    border-color: var(--border);
    background: rgba(0, 212, 255, 0.05);
}

input[type="radio"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    margin-right: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

input[type="radio"]:checked {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2);
}

input[type="radio"]:checked::after {
    content: none;
}

input[type="radio"]:checked + .radio-label {
    color: var(--accent-primary);
    font-weight: 500;
}

.radio-label {
    color: var(--text-primary);
    transition: color 0.2s;
}

.checkbox-option {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.checkbox-option:hover {
    border-color: var(--border);
    background: rgba(0, 212, 255, 0.05);
}

.checkbox-option.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.checkbox-option.disabled:hover {
    border-color: transparent;
    background: var(--bg-secondary);
}

input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 4px;
    margin-right: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
    position: relative;
}

input[type="checkbox"]:checked {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
}

input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--bg-card);
    font-size: 14px;
    font-weight: bold;
}

.passwords-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.password-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    animation: slideIn 0.4s ease-out backwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.password-card:nth-child(1) { animation-delay: 0.05s; }
.password-card:nth-child(2) { animation-delay: 0.1s; }
.password-card:nth-child(3) { animation-delay: 0.15s; }
.password-card:nth-child(4) { animation-delay: 0.2s; }
.password-card:nth-child(5) { animation-delay: 0.25s; }
.password-card:nth-child(6) { animation-delay: 0.3s; }
.password-card:nth-child(7) { animation-delay: 0.35s; }
.password-card:nth-child(8) { animation-delay: 0.4s; }
.password-card:nth-child(9) { animation-delay: 0.45s; }
.password-card:nth-child(10) { animation-delay: 0.5s; }

.password-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.password-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.2);
}

.password-card:hover::before {
    opacity: 1;
}

.password-card.copied {
    border-color: var(--success);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.password-text {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    word-break: break-all;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.password-footer {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.copy-hint,
.copied-indicator {
    justify-self: center;
    grid-column: 2;
    grid-row: 1;
    text-align: center;
}

.copy-hint {
    opacity: 0;
    transition: opacity 0.2s;
}

.password-card:hover .copy-hint {
    opacity: 1;
}

.password-card.copied .copy-hint {
    opacity: 0;
    transition: opacity 0s;
}

.copied-indicator {
    color: var(--success);
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.3s;
}

.password-card.copied .copied-indicator {
    opacity: 1;
}

.password-card.copied:hover .copy-hint {
    opacity: 0;
}

.strength-indicator {
    display: flex;
    gap: 2px;
}

.strength-bar {
    width: 20px;
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
}

.strength-bar.active {
    background: var(--accent-primary);
}

.regenerate-fab {
    display: none;
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0.875rem 1.5rem;
    background: #1791c2;
    color: #fff;
    border: none;
    border-radius: 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.4);
    transition: all 0.2s;
    z-index: 100;
}

.regenerate-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.5);
}

.regenerate-fab:active {
    transform: translateY(0);
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .controls {
        grid-template-columns: 1fr;
        padding: 1.5rem;
    }

    .control-chartype {
        grid-column: 1;
    }

    .control-symbol,
    .control-length {
        order: unset;
    }

    .radio-group {
        grid-template-columns: 1fr;
    }

    .passwords-grid {
        grid-template-columns: 1fr;
        padding-bottom: 5rem;
    }

    .regenerate-fab {
        display: block;
    }
}