/* 
   Orbital-Link Rail Transit - Heavy-Industrial Minimalism Design System
   Project: PRJ-227-RAIL-CORE
*/

:root {
    /* Core Colors */
    --steel-gray: #263238;
    --signal-green: #00C853;
    --kinetic-orange: #FF6D00;
    --eco-blue: #00B0FF;
    --dark-bg: #121212;
    --light-text: #ECEFF1;
    --muted-text: #90A4AE;
    --border-color: #37474F;
    
    /* Typography */
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body {
    background-color: var(--dark-bg);
    color: var(--light-text);
    font-family: var(--font-display);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--light-text);
}

.mono-num {
    font-family: var(--font-mono);
}

/* Navbar Styling */
.navbar {
    background-color: rgba(38, 50, 56, 0.95);
    border-bottom: 2px solid var(--border-color);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 900;
    letter-spacing: 1px;
    color: var(--light-text) !important;
}

.navbar-brand span {
    color: var(--kinetic-orange);
}

.nav-link {
    color: var(--muted-text) !important;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    margin: 0 0.5rem;
}

.nav-link:hover, .nav-link.active {
    color: var(--signal-green) !important;
}

/* Buttons */
.btn-industrial {
    border-radius: 0;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.8rem 2rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-orange {
    background-color: var(--kinetic-orange);
    color: white;
}

.btn-orange:hover {
    background-color: transparent;
    border-color: var(--kinetic-orange);
    color: var(--kinetic-orange);
}

.btn-outline-green {
    border-color: var(--signal-green);
    color: var(--signal-green);
}

.btn-outline-green:hover {
    background-color: var(--signal-green);
    color: var(--dark-bg);
}

/* Sections */
section {
    padding: 80px 0;
}

.section-title {
    border-left: 5px solid var(--kinetic-orange);
    padding-left: 1.5rem;
    margin-bottom: 3rem;
}

/* Cards */
.industrial-card {
    background-color: var(--steel-gray);
    border: 1px solid var(--border-color);
    border-radius: 0;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.industrial-card:hover {
    transform: translateY(-5px);
    border-color: var(--signal-green);
}

/* Footer */
footer {
    background-color: #0a0a0a;
    border-top: 2px solid var(--border-color);
    padding: 60px 0 20px;
}

.footer-logo {
    font-weight: 900;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-link {
    color: var(--muted-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Utilities */
.text-signal-green { color: var(--signal-green); }
.text-kinetic-orange { color: var(--kinetic-orange); }
.text-eco-blue { color: var(--eco-blue); }
.bg-steel { background-color: var(--steel-gray); }

/* Animations */
@keyframes pulse-green {
    0% { box-shadow: 0 0 0 0 rgba(0, 200, 83, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(0, 200, 83, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 200, 83, 0); }
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 8px;
    background-color: var(--signal-green);
    animation: pulse-green 2s infinite;
}