/* 
   Precision Core Automation & Industrial Robotics 
   Design System - Industrial Precision Style
*/

:root {
    /* Core Colors */
    --color-bg: #1B1E21;          /* 工業碳黑 */
    --color-accent: #FF6D00;      /* 高能警示橘 */
    --color-logic: #00A8FF;       /* 邏輯線路藍 */
    --color-silver: #E0E0E0;      /* 鋁合金銀 */
    --color-dark-gray: #2C3034;
    --color-border: #3D4248;
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body {
    background-color: var(--color-bg);
    color: var(--color-silver);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.text-accent { color: var(--color-accent) !important; }
.text-logic { color: var(--color-logic) !important; }
.font-mono { font-family: var(--font-mono); }

/* Background Patterns */
.bg-circuit {
    background-image: radial-gradient(var(--color-border) 1px, transparent 1px);
    background-size: 30px 30px;
}

.bg-brushed-metal {
    background: linear-gradient(135deg, #2c3034 0%, #1b1e21 100%);
    position: relative;
}

.bg-brushed-metal::before {
    content: "";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: repeating-linear-gradient(90deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 2px);
    pointer-events: none;
}

/* Components */
.navbar {
    background-color: rgba(27, 30, 33, 0.95);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
}

.nav-link {
    color: var(--color-silver) !important;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem !important;
    transition: all 0.3s ease;
}

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

.btn-industrial {
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: 0;
    padding: 0.75rem 2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-industrial:hover {
    background-color: #e66200;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 109, 0, 0.3);
}

.btn-outline-industrial {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: 0;
    padding: 0.75rem 2rem;
    font-weight: 700;
    text-transform: uppercase;
    transition: all 0.3s ease;
}

.btn-outline-industrial:hover {
    background-color: var(--color-accent);
    color: white;
}

/* Section Styling */
section {
    padding: 80px 0;
}

.section-title {
    margin-bottom: 50px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--color-accent);
}

/* Cards */
.industrial-card {
    background-color: var(--color-dark-gray);
    border: 1px solid var(--color-border);
    border-radius: 0;
    padding: 30px;
    height: 100%;
    transition: all 0.3s ease;
}

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

/* Footer */
footer {
    background-color: #121416;
    border-top: 1px solid var(--color-border);
    padding: 60px 0 30px;
}

/* Animations */
@keyframes scanline {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

.scanline {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 2px;
    background: rgba(0, 168, 255, 0.2);
    animation: scanline 4s linear infinite;
    pointer-events: none;
}