:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
}

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

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 500px;
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    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: 32px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.tabs {
    display: flex;
    gap: 8px;
    background: rgba(0, 0, 0, 0.2);
    padding: 4px;
    border-radius: 12px;
    margin-bottom: 24px;
}

.tab-btn {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-muted);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(10px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.input-group {
    margin-bottom: 20px;
    position: relative;
}

label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

input[type="text"],
input[type="password"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    padding: 14px 16px;
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

input:focus {
    border-color: var(--primary);
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 38px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.strength-meter {
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    margin: 16px 0;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 16px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-value {
    font-weight: 700;
    font-size: 1rem;
}

.feedback-list {
    margin-top: 20px;
    list-style: none;
}

.feedback-item {
    font-size: 0.85rem;
    color: var(--warning);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.feedback-item::before {
    content: '•';
    color: var(--warning);
}

.btn-primary {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 12px;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    color: white;
    border: 1px solid var(--glass-border);
    padding: 12px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 12px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.result-area {
    background: rgba(0, 0, 0, 0.3);
    padding: 16px;
    border-radius: 12px;
    margin: 20px 0;
    text-align: center;
    border: 1px dashed var(--glass-border);
    word-break: break-all;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 1.2rem;
    color: var(--primary);
}

.slider-group {
    margin: 24px 0;
}

input[type="range"] {
    width: 100%;
    margin-top: 12px;
    accent-color: var(--primary);
}

@media (max-width: 480px) {
    .container {
        padding: 24px;
    }
}