:root {
    --energy-blue: #0D47A1;
    --discharge-yellow: #FFEA00;
    --insulation-gray: #455A64;
    --load-green: #00C853;
    --dark-bg: #0a0a0a;
    --text-light: #e0e0e0;
}

body {
    background-color: var(--dark-bg);
    color: var(--text-light);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    overflow-x: hidden;
}

.mono-font {
    font-family: 'Fira Code', 'Courier New', monospace;
}

/* 導覽列樣式 */
.navbar {
    background-color: rgba(13, 71, 161, 0.95) !important;
    border-bottom: 2px solid var(--discharge-yellow);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--discharge-yellow) !important;
}

.nav-link {
    color: var(--text-light) !important;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--discharge-yellow) !important;
    text-shadow: 0 0 8px rgba(255, 234, 0, 0.6);
}

/* 電流流光效果 */
.circuit-line {
    position: relative;
    height: 2px;
    background: rgba(255, 234, 0, 0.1);
    overflow: hidden;
}

.circuit-line::after {
    content: "";
    position: absolute;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--discharge-yellow), transparent);
    animation: flow 3s infinite linear;
}

@keyframes flow {
    0% { left: -100%; }
    100% { left: 200%; }
}

/* 卡片樣式 */
.card {
    background: rgba(69, 90, 100, 0.2);
    border: 1px solid rgba(255, 234, 0, 0.2);
    border-radius: 0;
    transition: all 0.3s ease;
}

.card:hover {
    border-color: var(--discharge-yellow);
    box-shadow: 0 0 15px rgba(255, 234, 0, 0.2);
    transform: translateY(-5px);
}

.section-title {
    border-left: 5px solid var(--discharge-yellow);
    padding-left: 15px;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

footer {
    background-color: #050505;
    border-top: 1px solid var(--insulation-gray);
    padding: 50px 0;
    margin-top: 100px;
}