/* XCryp - Cryptography & Security Excellence */
/* shadcn/ui + Tailwind CSS inspired design system */

/* CSS Variables - Security Purple Theme */
:root {
    /* Colors - Security Purple Theme */
    --color-background: #0a0a0f;
    --color-foreground: #f4f4f5;
    --color-muted: #27272a;
    --color-muted-foreground: #a1a1aa;
    --color-card: #18181b;
    --color-card-foreground: #f4f4f5;
    --color-border: #27272a;
    --color-input: #27272a;

    /* Primary - Security Purple */
    --color-primary: #8b5cf6;
    --color-primary-foreground: #ffffff;
    --color-primary-50: #f5f3ff;
    --color-primary-100: #ede9fe;
    --color-primary-500: #8b5cf6;
    --color-primary-600: #7c3aed;
    --color-primary-700: #6d28d9;
    --color-primary-900: #4c1d95;

    /* Secondary - Cyber Blue */
    --color-secondary: #3b82f6;
    --color-secondary-foreground: #ffffff;
    --color-secondary-50: #eff6ff;
    --color-secondary-500: #3b82f6;
    --color-secondary-600: #2563eb;

    /* Accent - Security Green */
    --color-accent: #10b981;
    --color-accent-foreground: #ffffff;

    /* Destructive - Security Red */
    --color-destructive: #ef4444;
    --color-destructive-foreground: #ffffff;

    /* Status Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-foreground);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    color: var(--color-muted-foreground);
    margin-bottom: var(--spacing-md);
}

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-primary-foreground);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-600);
    border-color: var(--color-primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-secondary-foreground);
    border-color: var(--color-secondary);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-600);
    border-color: var(--color-secondary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-foreground);
    border-color: var(--color-border);
}

.btn-outline:hover {
    background-color: var(--color-muted);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-icon {
    font-size: 1rem;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(2px);
}

/* Badge Component */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    background-color: var(--color-muted);
    color: var(--color-muted-foreground);
}

/* Card Components */
.card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-foreground);
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-muted-foreground);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 3px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 20px;
    height: 2px;
    background-color: var(--color-foreground);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    background: radial-gradient(ellipse at top, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-badge {
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-muted-foreground);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

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

.hero-visual {
    display: flex;
    justify-content: center;
}

.crypto-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.crypto-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    min-width: 120px;
}

.crypto-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.crypto-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.crypto-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-foreground);
    font-family: var(--font-mono);
}

/* Sections */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background-color: var(--color-muted);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-muted-foreground);
    max-width: 600px;
    margin: 0 auto;
}

/* Topic Cards */
.topic-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.topic-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.topic-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.topic-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-foreground);
}

.topic-description {
    color: var(--color-muted-foreground);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.topic-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-muted);
    color: var(--color-muted-foreground);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

/* Algorithm Cards */
.algorithm-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.algorithm-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.algorithm-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.algorithm-icon {
    font-size: 2rem;
    background-color: var(--color-primary);
    color: var(--color-primary-foreground);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 3rem;
    min-height: 3rem;
}

.algorithm-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-foreground);
    flex: 1;
}

.algorithm-type {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-secondary);
    color: var(--color-secondary-foreground);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.algorithm-description {
    color: var(--color-muted-foreground);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.algorithm-specs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.spec {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.spec:last-child {
    border-bottom: none;
}

.spec-label {
    font-weight: 500;
    color: var(--color-foreground);
}

.spec-value {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-muted-foreground);
}

/* Security Cards */
.security-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
    position: relative;
}

.security-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.security-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.security-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-foreground);
}

.security-description {
    color: var(--color-muted-foreground);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.security-level {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
}

.level-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.level-high {
    background-color: var(--color-error);
    color: var(--color-destructive-foreground);
}

.level-medium {
    background-color: var(--color-warning);
    color: var(--color-destructive-foreground);
}

.level-emerging {
    background-color: var(--color-info);
    color: var(--color-destructive-foreground);
}

/* Blockchain Section */
.blockchain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.blockchain-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.blockchain-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.blockchain-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.blockchain-icon {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-primary-foreground);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 3rem;
    min-height: 3rem;
}

.blockchain-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-foreground);
}

.blockchain-description {
    color: var(--color-muted-foreground);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.blockchain-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.feature {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-muted);
    color: var(--color-muted-foreground);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

/* Resources Section */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.resource-category {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-foreground);
}

.resource-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.resource-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background-color: var(--color-muted);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.resource-item:hover {
    background-color: var(--color-border);
    transform: translateX(4px);
}

.resource-title {
    font-weight: 500;
    color: var(--color-foreground);
}

.resource-author {
    font-size: 0.875rem;
    color: var(--color-muted-foreground);
}

/* Footer */
.footer {
    background-color: var(--color-card);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-foreground);
    margin-bottom: var(--spacing-lg);
}

.footer-description {
    color: var(--color-muted-foreground);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: var(--spacing-3xl);
}

.link-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.link-title {
    font-weight: 600;
    color: var(--color-foreground);
    margin-bottom: var(--spacing-sm);
}

.footer-link {
    color: var(--color-muted-foreground);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: var(--color-muted-foreground);
    font-size: 0.875rem;
}

.author-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.author-link:hover {
    text-decoration: underline;
}

.footer-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-muted-foreground);
    font-size: 0.875rem;
}

.meta-separator {
    opacity: 0.5;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-xl);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

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

/* 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 Styles */
.btn:focus,
.nav-link:focus,
.footer-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Smooth Scrolling */
html {
    scroll-padding-top: 80px;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Animation Classes */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .section {
        page-break-inside: avoid;
    }
}