/* DataCenter Hardware Security - Main CSS Framework */

/* ===== CSS VARIABLES ===== */
:root {
    /* Primary Color Palette */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --info-color: #8e44ad;

    /* Neutral Colors */
    --bg-color: #ecf0f1;
    --surface-color: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #bdc3c7;

    /* Interactive Colors */
    --hover-color: #34495e;
    --focus-color: #3498db;
    --border-color: #bdc3c7;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-security: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'Fira Code', 'Courier New', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 3px 6px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 15px 35px rgba(0, 0, 0, 0.15), 0 5px 15px rgba(0, 0, 0, 0.07);

    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--hover-color);
    text-decoration: underline;
}

code {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    background-color: rgba(0, 0, 0, 0.05);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

pre {
    font-family: var(--font-family-mono);
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* ===== LAYOUT COMPONENTS ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xxl) 0;
}

.section.bg-light {
    background-color: #f8f9fa;
}

.section.bg-dark {
    background-color: var(--primary-color);
    color: white;
}

.section.bg-dark h1,
.section.bg-dark h2,
.section.bg-dark h3,
.section.bg-dark h4,
.section.bg-dark h5,
.section.bg-dark h6 {
    color: white;
}

.section.bg-dark p {
    color: rgba(255, 255, 255, 0.8);
}

.section.text-light {
    color: white;
}

.section.text-light h1,
.section.text-light h2,
.section.text-light h3,
.section.text-light h4,
.section.text-light h5,
.section.text-light h6 {
    color: white;
}

.section.text-light p {
    color: rgba(255, 255, 255, 0.9);
}

/* ===== NAVIGATION ===== */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.nav-brand h1 {
    color: white;
    margin: 0;
    font-size: var(--font-size-2xl);
}

.nav-brand p {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    font-size: var(--font-size-sm);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
}

.nav-link:hover {
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 120px;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
    color: white;
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    text-decoration: none;
}

.btn-outline {
    background: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-outline:hover {
    background: var(--secondary-color);
    color: white;
    text-decoration: none;
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.1);
    color: var(--secondary-color);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.2);
    text-decoration: none;
}

/* ===== HERO SECTION ===== */
.hero {
    background: var(--gradient-security);
    color: white;
    padding: var(--spacing-xxl) 0;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-content h1 {
    color: white;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-4xl);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xxl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: white;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.8);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

/* ===== LEARNING PATHS ===== */
.learning-paths {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.path-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: transform var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.path-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.path-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.path-duration {
    color: var(--info-color);
    font-weight: 600;
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(142, 68, 173, 0.1);
    border-radius: var(--border-radius-md);
}

/* ===== MODULE CARDS ===== */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.module-card {
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.module-header {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.module-number {
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.progress-bar {
    width: 100px;
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: white;
    border-radius: var(--border-radius-full);
    transition: width var(--transition-base);
}

.module-card h3 {
    padding: 0 var(--spacing-lg);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
}

.module-card p {
    padding: 0 var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.module-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.feature {
    background: rgba(52, 152, 219, 0.1);
    color: var(--secondary-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.module-actions {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===== GAMES GRID ===== */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.game-card {
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.game-preview {
    background: var(--gradient-secondary);
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-4xl);
}

.game-card h3 {
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
    color: var(--primary-color);
}

.game-card p {
    padding: 0 var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.game-stats {
    display: flex;
    justify-content: space-around;
    padding: 0 var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.game-card .btn {
    margin: 0 var(--spacing-lg) var(--spacing-lg);
    width: calc(100% - var(--spacing-xl));
}

/* ===== REFERENCE GRID ===== */
.reference-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.reference-card {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-decoration: none;
    color: inherit;
}

.reference-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
    text-decoration: none;
    color: inherit;
}

.reference-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

.reference-card h3 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.reference-card p {
    color: rgba(255, 255, 255, 0.8);
}

/* ===== PROGRESS DASHBOARD ===== */
.progress-dashboard {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.overall-progress {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.circular-progress {
    position: relative;
    display: inline-block;
    margin-top: var(--spacing-lg);
}

.progress-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: conic-gradient(var(--secondary-color) 0deg, var(--border-color) 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-percentage {
    background: white;
    border-radius: 50%;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--primary-color);
}

.achievements-panel {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.badge {
    background: var(--bg-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.badge.locked {
    opacity: 0.5;
}

.badge:not(.locked) {
    background: var(--gradient-success);
    color: white;
    transform: scale(1.05);
}

.badge-icon {
    font-size: var(--font-size-2xl);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.badge-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-section a:hover {
    color: white;
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .progress-dashboard {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-menu {
        width: 100%;
        justify-content: center;
    }

    .hero-content h1 {
        font-size: var(--font-size-3xl);
    }

    .hero-actions {
        justify-content: center;
    }

    .modules-grid,
    .learning-paths,
    .games-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .section {
        padding: var(--spacing-xl) 0;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .module-actions,
    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .badges-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

:focus {
    outline: 2px solid var(--focus-color);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* ===== DARK MODE SUPPORT ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --surface-color: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --border-color: #404040;
    }
}