:root {
    --bg-base: #06080D;
    --bg-surface: #121824;
    --bg-elevated: #1A2333;
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --accent-red: #EF4444;
    --accent-orange: #F59E0B;
    --accent-green: #10B981;
    --accent-blue: #38BDF8;
    
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --shadow: 0 20px 40px rgba(0,0,0,0.4);
    
    --font-ui: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light-mode {
    --bg-base: #F8FAFC;
    --bg-surface: #FFFFFF;
    --bg-elevated: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --border: rgba(0, 0, 0, 0.1);
    --border-hover: rgba(0, 0, 0, 0.2);
    --shadow: 0 20px 40px rgba(0,0,0,0.05);
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-ui);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Layout */
.layout-wrapper {
    display: grid;
    grid-template-columns: 160px minmax(auto, 800px) 160px;
    gap: 40px;
    justify-content: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
}

/* AdSense Sidebars */
.ads-sidebar {
    padding: 40px 0;
    display: flex;
    justify-content: center;
    position: sticky;
    top: 0;
    height: 100vh;
}

.ads-placeholder-vertical {
    width: 160px;
    height: 600px;
    background-color: rgba(255,255,255,0.02);
    border: 1px dashed var(--border-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 12px;
    border-radius: 8px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

/* Main Application Container */
.app-container {
    padding: 60px 0;
    display: flex;
    flex-direction: column;
    gap: 60px;
}

/* Header */
.app-header {
    text-align: center;
}

.app-header h1 {
    font-size: 42px;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.app-header h1 span {
    color: var(--accent-blue);
}

.app-header p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 24px;
}

.privacy-warning {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: rgba(239, 68, 68, 0.1);
    color: #FCA5A5;
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 13px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Calculator Panel */
.calculator-panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow);
}

/* Input Area */
.input-group {
    position: relative;
    margin-bottom: 40px;
}

#passwordInput {
    width: 100%;
    background-color: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 60px 20px 24px;
    font-family: var(--font-mono);
    font-size: 20px;
    color: var(--text-primary);
    transition: var(--transition);
}

#passwordInput:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.toggle-btn {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
}

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

/* Gauge */
.gauge-container {
    margin-bottom: 40px;
}

.gauge-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
}

.strength-label {
    font-weight: 600;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    transition: var(--transition);
}

.entropy-bits {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    font-size: 14px;
}

.gauge-track {
    width: 100%;
    height: 12px;
    background-color: var(--bg-elevated);
    border-radius: 6px;
    overflow: hidden;
}

.gauge-fill {
    height: 100%;
    width: 0%;
    background-color: var(--text-muted);
    border-radius: 6px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.5s ease;
}

/* Stats Table */
.stats-card {
    background-color: var(--bg-elevated);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border);
}

.stats-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.stats-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.stats-table {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background-color: var(--bg-surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stat-icon {
    font-size: 24px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-base);
    border-radius: 8px;
}

.stat-info h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 2px;
}

.stat-info span {
    font-size: 12px;
    color: var(--text-muted);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 15px;
    font-weight: 700;
    color: var(--accent-red);
    text-align: right;
}

/* SEO Content */
.seo-content {
    border-top: 1px solid var(--border);
    padding-top: 60px;
}

.seo-content h2 {
    font-size: 24px;
    margin-bottom: 32px;
    text-align: center;
}

.seo-content article {
    margin-bottom: 40px;
}

.seo-content h3 {
    font-size: 18px;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.seo-content p {
    color: var(--text-secondary);
    font-size: 15px;
}

.seo-content code {
    background-color: var(--bg-surface);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--text-primary);
}

footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-muted);
    font-size: 13px;
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 1200px) {
    .layout-wrapper {
        grid-template-columns: 1fr;
    }
    
    .ads-sidebar {
        display: none; /* Hide vertical ads on smaller screens, they interfere with UX */
    }
}

@media (max-width: 600px) {
    .calculator-panel {
        padding: 24px;
    }
    
    .stat-row {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 8px;
    }
    
    .stat-icon {
        margin: 0 auto;
    }
    
    .stat-value {
        text-align: center;
        margin-top: 8px;
    }
}