/* RailShield - Liquid Glass Design System */

:root {
    /* Colors - Cybersecurity Theme */
    --color-bg-dark: #0f172a;
    --color-bg-darker: #020617;
    --color-primary: #1e40af;
    --color-accent: #06b6d4;
    --color-accent-bright: #0ea5e9;
    --color-text: #f1f5f9;
    --color-text-muted: #cbd5e1;
    
    /* Glass Effects */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-bg-hover: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: 20px;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Border Radius - Only 2 values (Liquid Glass Rule) */
    --radius-soft: 1rem;
    --radius-full: 9999px;
    
    /* Animations */
    --ease-fluid: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 200ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 100%);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(30, 64, 175, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Navigation */
.glass-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-sm) 0;
    transition: all var(--duration-normal) var(--ease-fluid);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.nav-logo {
    width: 32px;
    height: 32px;
    color: var(--color-accent);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: var(--radius-full);
    transition: all var(--duration-normal) var(--ease-fluid);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-md);
}

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-soft);
    transition: all var(--duration-normal) var(--ease-fluid);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
    background: rgba(6, 182, 212, 0.1);
}

/* Glass Card Component */
.glass-card {
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-soft);
    padding: var(--space-lg);
    transition: all var(--duration-normal) var(--ease-fluid);
}

.glass-card:hover {
    transform: translateY(-4px);
    background: var(--glass-bg-hover);
    box-shadow: 0 12px 40px rgba(6, 182, 212, 0.2),
                0 0 0 1px rgba(255, 255, 255, 0.1);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    position: relative;
    z-index: 1;
}

/* Sections */
.section {
    padding: var(--space-2xl) 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

/* Hero Section */
#hero {
    padding-top: calc(var(--space-2xl) + 60px);
}

.hero-content {
    max-width: 600px;
}

.glass-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    backdrop-filter: blur(var(--glass-blur));
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.hero-visual {
    margin-top: var(--space-xl);
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.stat strong {
    display: block;
    font-size: 2rem;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.stat span {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-soft);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-fluid);
    cursor: pointer;
    border: none;
    font-family: inherit;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: white;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
    backdrop-filter: blur(var(--glass-blur));
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: var(--glass-bg-hover);
    border-color: var(--color-accent);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Section Headers */
h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
    text-align: center;
}

.subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
    font-size: 1.125rem;
}

/* Grid Layouts */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.glass-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.glass-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.glass-card ul {
    list-style: none;
    padding: 0;
}

.glass-card li {
    padding: var(--space-xs) 0;
    color: var(--color-text-muted);
    position: relative;
    padding-left: var(--space-md);
}

.glass-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Technology Section */
.tech-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.tech-list > div {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--glass-border);
}

.tech-list > div:last-child {
    border-bottom: none;
}

.tech-list strong {
    display: block;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.tech-list p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.badge {
    padding: var(--space-xs) var(--space-sm);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-full);
    color: var(--color-accent);
    font-size: 0.875rem;
    font-weight: 500;
}

/* About Section */
.about-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.lead {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.values {
    margin-top: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.values > div {
    padding: var(--space-md);
    border-left: 3px solid var(--color-accent);
    background: rgba(6, 182, 212, 0.05);
    border-radius: var(--radius-soft);
}

.values strong {
    display: block;
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
}

.values p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.stats-grid > div {
    text-align: center;
}

.stats-grid strong {
    display: block;
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.stats-grid span {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Contact Section */
.contact-layout {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.contact-form {
    padding: var(--space-xl);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-soft);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--duration-normal) var(--ease-fluid);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-info > div {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--glass-border);
}

.contact-info > div:last-child {
    border-bottom: none;
}

.contact-info strong {
    display: block;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.contact-info p {
    color: var(--color-text-muted);
}

/* Footer */
.footer {
    padding: var(--space-lg) 0;
    backdrop-filter: blur(var(--glass-blur));
    background: var(--glass-bg);
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .tech-layout,
    .about-layout,
    .contact-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--glass-bg);
        backdrop-filter: blur(var(--glass-blur));
        border-bottom: 1px solid var(--glass-border);
        padding: var(--space-md);
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--duration-normal) var(--ease-fluid);
    }
    
    .nav-menu.active {
        max-height: 400px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
}

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

.section {
    animation: fadeInUp var(--duration-slow) var(--ease-fluid);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}