/* Global Reset & Brand Identity Colors */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #000000; 
    --dark-bg: #ffffff;      
    --light-bg: #ffffff;     
    --text-dark: #000000;    
    --text-light: #000000;   
    --border-color: #e0e0e0; 
}

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

header {
    background-color: var(--dark-bg);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 2px solid var(--primary-color); 
}

.logo a {
    display: flex;
    align-items: center;
}

.logo img {
    height: 75px; 
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    padding: 0.5rem 0;
    transition: color 0.2s, border-bottom 0.2s;
}

nav a:hover, nav a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 5%;
}

/* Calculator Grid Structure */
.calc-grid { 
    display: grid; 
    grid-template-columns: 1.2fr 1fr; 
    gap: 2.5rem; 
    margin-top: 2rem; 
}

@media(max-width: 768px) { 
    .calc-grid { grid-template-columns: 1fr; } 
}

.setup-card { 
    background: #fff; 
    border: 1px solid #000; 
    padding: 2rem; 
}

.summary-card { 
    background: #fafafa; 
    border: 1px solid #000; 
    padding: 2rem; 
    position: sticky; 
    top: 6rem; 
    height: fit-content;
}

.form-row { 
    margin-bottom: 1.2rem; 
}

.form-row label { 
    display: block; 
    font-weight: bold; 
    text-transform: uppercase; 
    font-size: 0.8rem; 
    margin-bottom: 0.4rem; 
}

.form-row select, .form-row input { 
    width: 100%; 
    padding: 0.7rem; 
    border: 1px solid #000; 
    font-size: 1rem; 
    box-sizing: border-box; 
    background: #fff; 
}

/* Size Grid Matrix */
.size-matrix { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(75px, 1fr)); 
    gap: 0.5rem; 
    margin-top: 0.5rem; 
}

.size-box { 
    border: 1px solid #000; 
    padding: 0.5rem; 
    text-align: center; 
    background: #fff; 
}

.size-box label { 
    display: block; 
    font-weight: bold; 
    font-size: 0.8rem; 
    margin-bottom: 0.2rem; 
}

.size-box input { 
    width: 100%; 
    text-align: center; 
    border: 1px solid #000; 
    padding: 0.3rem; 
    font-size: 0.95rem; 
}

/* Placement Blocks */
.placement-group { 
    display: none; 
    margin-top: 1.5rem; 
    padding-top: 1rem; 
    border-top: 1px solid #000; 
}

.placement-row { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    margin-bottom: 0.8rem; 
}

.placement-row label { 
    font-size: 0.85rem; 
    font-weight: bold; 
    text-transform: uppercase; 
}

.placement-row select { 
    width: 120px; 
    padding: 0.4rem; 
    border: 1px solid #000; 
}

/* Actions & Buttons */
.action-btn { 
    display: block; 
    text-align: center; 
    padding: 1rem; 
    text-transform: uppercase; 
    font-weight: bold; 
    font-size: 0.85rem; 
    letter-spacing: 0.5px; 
    border: 1px solid #000; 
    margin-bottom: 0.8rem; 
    text-decoration: none; 
    cursor: pointer; 
    transition: background 0.2s, color 0.2s; 
}

.action-btn:hover {
    background: #000;
    color: #fff;
}

.email-btn { background: #000; color: #fff; }
.email-btn:hover { background: #333; }
.whatsapp-btn { background: #25D366; color: #fff; border-color: #25D366; }
.whatsapp-btn:hover { background: #1ebd54; }

.grand-display { 
    font-size: 2.8rem; 
    font-weight: 900; 
    color: #000; 
    margin: 0.5rem 0; 
    font-family: monospace; 
}

footer {
    background-color: #000;
    color: #fff;
    text-align: center;
    padding: 2rem;
    margin-top: 5rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Print Layout Spec */
@media print {
    header, nav, footer, .setup-card, .action-btn, style, script {
        display: none !important;
    }
    body {
        background: #fff !important;
        color: #000 !important;
        font-family: Arial, sans-serif !important;
        font-size: 12pt !important;
        margin: 0 !important;
        padding: 0 !important;
    }
    .calc-grid {
        display: block !important;
    }
    .summary-card {
        border: none !important;
        background: transparent !important;
        padding: 0 !important;
        margin: 0 !important;
        position: static !important;
        width: 100% !important;
    }
    .summary-card::before {
        content: "GUY ON THE COUCH DESIGNS\A PILGRIM'S REST, MPUMALANGA\A Web: www.guyonthecouch.co.za\A Email: info@guyonthecouch.co.za\A\A ESTIMATED PRODUCTION SPECIFICATION\A------------------------------------------------------------";
        white-space: pre-wrap;
        display: block;
        font-weight: bold;
        margin-bottom: 20px;
        line-height: 1.4;
    }
}