:root {
    --bg-color: #0A1A12;
    --card-bg: rgba(16, 185, 129, 0.05);
    --card-border: rgba(16, 185, 129, 0.15);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    --primary-color: #10B981;
    --secondary-color: #6EE7B7;
    --accent-color: #F59E0B;
    
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --success: #10B981;
    
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
    background-image: 
        radial-gradient(circle at 50% 0%, rgba(16, 185, 129, 0.1), transparent 40%),
        radial-gradient(circle at 0% 100%, rgba(245, 158, 11, 0.05), transparent 40%);
}

.app-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.header-icon {
    width: 60px;
    height: 60px;
    background: var(--card-bg);
    border: 1px solid var(--primary-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    box-shadow: 0 0 24px rgba(16, 185, 129, 0.2);
}

.header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: #fff;
}

.header p {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.75rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.3);
}

/* Input Section */
.input-section {
    position: relative;
    padding: 2.5rem;
    border-color: rgba(16, 185, 129, 0.3);
}

.input-wrapper {
    position: relative;
    width: 100%;
    margin-bottom: 2rem;
}

#passwordInput {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid var(--card-border);
    border-radius: 8px;
    padding: 1rem 3rem 1rem 1.25rem;
    font-size: 1.5rem;
    color: #fff;
    outline: none;
    transition: all 0.2s ease;
    font-family: var(--font-mono);
    letter-spacing: 2px;
}

#passwordInput:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

.visibility-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s ease;
}

.visibility-btn:hover {
    color: #fff;
}

.visibility-btn .hidden {
    display: none;
}

/* Strength Meter */
.strength-meter-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.strength-label {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    font-size: 1.1rem;
}

.strength-value {
    transition: color 0.3s ease;
}

.strong-0 { color: var(--danger); text-shadow: 0 0 10px rgba(239, 68, 68, 0.4); }
.strong-1 { color: #f97316; }
.strong-2 { color: var(--warning); }
.strong-3 { color: #84cc16; }
.strong-4 { color: var(--success); text-shadow: 0 0 10px rgba(16, 185, 129, 0.4); }

.strength-bars {
    display: flex;
    gap: 0.5rem;
    height: 8px;
}

.strength-bars .bar {
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

/* Grid Layout */
.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

/* Custom Card Layouts */
.stats-card {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-content {
    flex: 1;
}

.card-content h3 {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.crack-time {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #fff;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.scenario-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.scenario {
    display: flex;
    justify-content: space-between;
    padding-bottom: 0.25rem;
    border-bottom: 1px dotted rgba(255,255,255,0.1);
}

.entropy-val {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #fff;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.entropy-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Checklist */
.checklist-card h3, .feedback-card h3 {
    font-size: 1.125rem;
    color: var(--secondary-color);
    margin-bottom: 1.25rem;
    font-weight: 600;
}

.check-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.req-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.req-item .icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    font-weight: bold;
    font-size: 0.75rem;
    transition: all 0.3s ease;
}

.req-item.met {
    color: var(--text-primary);
}

.req-item.met .icon {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    content: "✓";
}

/* Feedback */
.feedback-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.empty-state {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.95rem;
}

.feedback-msg {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-left: 4px solid var(--info);
    font-size: 0.9rem;
}

.feedback-msg.warning {
    border-left-color: var(--warning);
    background: rgba(245, 158, 11, 0.05);
}

.feedback-msg.danger {
    border-left-color: var(--danger);
    background: rgba(239, 68, 68, 0.05);
}

@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}