:root {
    --bg-color: #111827;
    --card-bg: #1f2937;
    --text: #f9fafb;
    --text-muted: #9ca3af;
    --primary: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: #374151;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 500px;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

.shield-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.highlight {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.input-area {
    position: relative;
    margin-bottom: 2rem;
}

#password-input {
    width: 100%;
    background: var(--card-bg);
    border: 2px solid var(--border);
    padding: 1rem 3rem 1rem 1rem;
    border-radius: 0.75rem;
    color: white;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    outline: none;
    transition: border-color 0.2s;
}

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

#toggle-visibility {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
}

.strength-meter-container {
    margin-bottom: 2rem;
}

.strength-bar-bg {
    height: 8px;
    background: #374151;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.strength-bar {
    height: 100%;
    width: 0%;
    background: var(--danger);
    transition: width 0.3s ease, background-color 0.3s ease;
}

.strength-text {
    text-align: right;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-card {
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 0.75rem;
    text-align: center;
    border: 1px solid var(--border);
}

.label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.value {
    font-weight: 700;
    font-size: 1.1rem;
}

.checklist {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 0.75rem;
}

.checklist h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.checklist ul {
    list-style: none;
}

.req {
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.req::before {
    content: '○';
    font-weight: bold;
}

.req.valid {
    color: var(--success);
}

.req.valid::before {
    content: '✓';
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--text);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.stat-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 0.5rem;
    border-radius: 0.5rem;
    text-align: center;
    border: 1px solid var(--border);
}

.stat-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.stat-value {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
}

/* Tips Section */
.tips-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tip-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    transition: transform 0.2s;
}

.tip-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.tip-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.tip-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}