/* ==========================================================================
   RikMakersHub Global Style System - RikAquaShield-Pro
   ========================================================================== */

/* Layout Architecture Variables */
:root {
    --bg-main: #fdfaf2;         /* Crisp off-white engineering canvas */
    --bg-surface: #ffffff;      /* Pure white block backgrounds */
    --bg-dark: #121824;         /* High-contrast charcoal slate for code */
    --text-primary: #1e2432;    /* Deep technical text */
    --text-secondary: #576073;  /* Subdued diagnostics & comments */
    --accent-red: #b91c1c;      /* Structural heading accents */
    --accent-blue: #0284c7;     /* Secondary active links */
    --accent-green: #16a34a;    /* Success state triggers */
    --border-color: #e2e8f0;    /* High-density grid dividers */
}

/* Base Reset Rules */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Global Top Alert Notification Banner */
.top-banner {
    background: #fef2f2;
    border-bottom: 1px solid #fee2e2;
    color: var(--accent-red);
    padding: 10px 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
}

/* Master Grid Wrapper */
.wrapper {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Sub-Navigation Grid */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 0;
    border-bottom: 1px solid var(--accent-red);
}

.brand-logo {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    text-transform: uppercase;
}

.brand-logo span {
    color: var(--accent-red);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.15s ease;
}

.nav-item:hover {
    color: var(--accent-red);
}

.btn-external {
    background: var(--text-primary);
    color: #ffffff;
    padding: 6px 14px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: opacity 0.15s ease;
}

.btn-external:hover {
    opacity: 0.9;
}

/* Technical Documentation Context Headers */
.doc-intro {
    padding: 50px 0 30px 0;
}

.system-tag {
    color: var(--accent-red);
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    display: block;
    margin-bottom: 10px;
}

.doc-intro h1 {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 15px;
    letter-spacing: -0.5px;
}

.doc-intro p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Section Header Typography */
section {
    padding: 35px 0;
}

section h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-red);
    border-bottom: 1px solid var(--accent-red);
    padding-bottom: 8px;
    margin-bottom: 25px;
    letter-spacing: 0.5px;
}

.section-sub {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

/* Info Architecture Grid blocks (Advantages) */
.info-block {
    margin-bottom: 10px;
}

.info-item {
    margin-bottom: 25px;
}

.info-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.info-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.price-tag {
    display: inline-block;
    margin-top: 6px;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* High-Density Value-Engineering Data Table */
.table-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    margin-top: 15px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.data-table th {
    background: #f8fafc;
    color: var(--text-primary);
    font-weight: 600;
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    vertical-align: top;
}

.data-table .bold-cell {
    color: var(--text-primary);
    font-weight: 600;
}

.total-row {
    background: #fdf8f6;
    font-weight: 700;
}

.total-row td {
    color: var(--accent-red);
    font-size: 1.05rem;
    border-bottom: none;
}

/* Responsive Structural Schematic Box */
.schematic-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 24px;
    margin-top: 15px;
}

.circuit-diagram-block {
    background: #1e2432;
    padding: 30px;
    border-radius: 6px;
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.node-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    width: 100%;
}

.vertical-drop {
    margin: 5px 0;
    color: #94a3b8;
    font-weight: bold;
}

.circuit-line-down {
    font-family: monospace;
}

.split-row {
    justify-content: space-around;
    max-width: 600px;
    margin-bottom: 20px;
}

.bidirectional {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    width: 100%;
    max-width: 800px;
    border-top: 1px dashed #334155;
    padding-top: 20px;
}

.circuit-node {
    padding: 10px 18px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    border: 1px solid rgba(255,255,255,0.1);
}

.solar   { background: #fef3c7; color: #d97706; }
.battery { background: #dcfce7; color: #15803d; }
.mcu     { background: #e0f2fe; color: #0369a1; }
.load    { background: #fee2e2; color: #b91c1c; }

.circuit-arrow {
    font-size: 1.2rem;
    color: #94a3b8;
    display: flex;
    align-items: center;
    justify-content: center;
}

.circuit-col {
    background: #121824;
    padding: 15px;
    border-radius: 4px;
    border: 1px solid #2d3748;
    text-align: left;
    min-width: 260px;
}

.circuit-col p {
    font-family: monospace;
    font-size: 0.85rem;
    color: #cbd5e1 !important;
    margin-bottom: 6px;
}

.circuit-col p:last-child {
    margin-bottom: 0;
}

.schematic-notes {
    border-top: 1px dashed var(--border-color);
    padding-top: 20px;
}

.schematic-notes h4 {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.schematic-notes ul {
    padding-left: 20px;
}

.schematic-notes li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.schematic-notes li strong {
    color: var(--text-primary);
}

/* Monospace Code Shell Box Modules */
.code-box {
    background: var(--bg-dark);
    border-radius: 6px;
    overflow: hidden;
    margin-top: 15px;
}

.code-bar {
    background: #0f141c;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #1e293b;
}

.code-bar span {
    font-family: monospace;
    font-size: 0.8rem;
    color: #94a3b8;
}

.btn-copy {
    background: transparent;
    color: #94a3b8;
    border: 1px solid #334155;
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.15s ease;
}

.btn-copy:hover {
    color: #ffffff;
    border-color: #64748b;
}

pre {
    padding: 20px;
    overflow-x: auto;
    color: #e2e8f0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
}

/* Document Footer Element Area */
footer {
    text-align: center;
    padding: 40px 0;
    color: #94a3b8;
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
}

/* Mobile Responsiveness Adaptive Rules */
@media (max-width: 768px) {
    header { flex-direction: column; gap: 15px; text-align: center; }
    .nav-links { gap: 12px; }
    .doc-intro h1 { font-size: 1.8rem; }
    
    /* Responsive Table Conversion */
    .data-table, .data-table tbody, .data-table tr, .data-table td, .data-table th { 
        display: block; 
        width: 100%; 
    }
    .data-table th { 
        display: none; 
    }
    .data-table td { 
        border-bottom: 1px solid var(--border-color); 
        padding: 12px 15px; 
    }
    
    /* Responsive Circuit Matrix System */
    .bidirectional { grid-template-columns: 1fr; }
    .split-row { flex-direction: column; gap: 10px; align-items: center; }
}