/* Base Styles */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #0f172a;
    --accent: #3b82f6;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><rect fill="rgba(255,255,255,0.1)" x="0" y="0" width="100" height="100"/></svg>') repeat;
    opacity: 0.1;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

.badge i {
    font-size: 1rem;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 3rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Navigation */
.page-nav {
    background: var(--card-bg);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 0 2rem;
}

.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.nav-item:hover {
    color: var(--primary);
    background: var(--background);
}

.nav-item.active {
    color: var(--primary);
    background: var(--background);
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.content-section {
    margin-bottom: 4rem;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.icon-circle {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary);
}

.content-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.highlight-card {
    border-left: 4px solid var(--primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--background);
    border-radius: 0.5rem;
    transition: transform 0.3s ease;
}

.info-item:hover {
    transform: translateY(-2px);
}

.info-item i {
    font-size: 1.5rem;
    color: var(--primary);
}

/* Importance Grid */
.importance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.importance-item {
    padding: 1.5rem;
    background: var(--background);
    border-radius: 1rem;
    transition: transform 0.3s ease;
}

.importance-item:hover {
    transform: translateY(-5px);
}

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

.item-header i {
    font-size: 1.5rem;
    color: var(--primary);
}

.item-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--secondary);
}

/* Levels Grid */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.level-card {
    padding: 2rem;
    background: var(--background);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.level-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.level-header {
    margin-bottom: 1.5rem;
}

.level-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: white;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.level-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--secondary);
}

.level-features {
    list-style: none;
    margin-top: 1.5rem;
}

.level-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.level-features li::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.benefit-item {
    text-align: center;
    padding: 2rem;
    background: var(--background);
    border-radius: 1rem;
    transition: transform 0.3s ease;
}

.benefit-item:hover {
    transform: translateY(-5px);
}

.benefit-item i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.benefit-item h3 {
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--secondary);
}

/* PCI DSS Requirements Section */
.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.requirement-group {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.requirement-group:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.group-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.group-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    margin-right: 1rem;
    flex-shrink: 0;
}

.group-icon i {
    font-size: 1.25rem;
}

.group-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.requirement-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.requirement-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.4;
}

.requirement-list li:last-child {
    margin-bottom: 0;
}

.requirement-list li::before {
    content: "•";
    color: var(--primary);
    position: absolute;
    left: 0.5rem;
    font-size: 1.2rem;
}

/* Implementation Steps Section */
.implementation-steps {
    position: relative;
    margin-top: 1.5rem;
}

.implementation-steps::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 20px;
    width: 2px;
    background-color: var(--primary);
    opacity: 0.3;
}

.step-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 1.5rem;
}

.step-item:last-child {
    margin-bottom: 0;
}

.step-number {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.2rem;
    z-index: 2;
}

.step-content {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.step-details {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.step-details li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.step-details li:last-child {
    margin-bottom: 0;
}

.step-details li::before {
    content: "✓";
    color: var(--success);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-section h1 {
        font-size: 2.5rem;
    }

    .hero-stats {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 1rem;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .nav-container {
        overflow-x: auto;
        justify-content: flex-start;
        padding: 0 1rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .levels-grid,
    .benefits-grid,
    .importance-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-section h1 {
        font-size: 1.75rem;
    }

    .content-card {
        padding: 1.5rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}

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

.content-section {
    animation: fadeIn 0.5s ease-out;
}