:root {
    /* Theme: Dark Blue Page, Mid-Grey Card, Light Text */
    --body-background-color: #0D2249; /* Deep Navy Blue - Page BG */
    --card-background-color: #4A4E57; /* Mid-Dark Grey - Card BG */
    
    --primary-text-color: #F5F5F5;    /* Light Grey/Off-White - Main text on card */
    --secondary-text-color: #B0B8C4;  /* Softer Light Grey - Labels, less important text on card */
    
    --accent-color: #5DADE2;          /* Brighter, slightly desaturated Blue - Accents */
    --accent-hover-color: #3498DB;    /* More Saturated Blue for hover */
    
    --success-color: #2ECC71;         /* Vibrant Green - Cost display */
    --border-color: #60656F;          /* Slightly lighter grey for borders on card */
    --input-background-color: #3E424A; /* Darker grey for input fields */
    --input-text-color: #E0E0E0;      /* Light text for inputs */
    --input-focus-border-color: var(--accent-color);
    --input-focus-shadow-color: rgba(93, 173, 226, 0.3);
    
    --shadow: 0 8px 25px rgba(0, 0, 0, 0.2); /* Shadow for the card */
    --border-radius: 12px;

    --disclaimer-text-color: #95A5A6; /* Muted grey for disclaimer text on card */
    --footer-text-color: #AAB8C2; /* Light grey for footer text on dark blue page BG */
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--body-background-color);
    color: var(--primary-text-color); 
    margin: 0;
    padding: 20px; 
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    background-color: var(--card-background-color);
    color: var(--primary-text-color);
    padding: 30px 35px; 
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 580px; 
    text-align: center;
    margin-top: 30px; 
    margin-bottom: 30px;
}

header {
    margin-bottom: 30px; 
}

.header-content {
    display: flex;
    align-items: center; 
    justify-content: center; 
    gap: 18px; 
}

#logo {
    max-height: 70px; 
    width: auto;
    flex-shrink: 0;
    /* filter: brightness(0) invert(1); */
}

.header-text-group { 
    display: flex;
    flex-direction: column;
    align-items: center; 
    flex-shrink: 1;
    min-width: 0; 
}

header h1 { 
    color: var(--accent-color); 
    font-weight: 700;
    font-size: 2em; 
    margin: 0; 
    letter-spacing: 0.5px;
    line-height: 1.2; 
    text-align: center; 
}

.sub-heading { 
    color: var(--secondary-text-color); 
    font-size: 0.9em; 
    font-weight: 400;
    margin: 0; 
    line-height: 1.2; 
    text-align: center; 
}

.form-container {
    display: flex;
    flex-direction: column;
    gap: 22px; 
    margin-bottom: 30px;
}

.input-group {
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 8px; 
    font-weight: 500;
    color: var(--secondary-text-color); 
}

.input-group input[type="number"],
.input-group select {
    width: 100%;
    padding: 12px 15px; 
    border: 1px solid var(--border-color);
    border-radius: calc(var(--border-radius) - 6px); 
    box-sizing: border-box;
    font-size: 1em; 
    line-height: 1.4; /* ADDED: For consistent text height within form elements */
    vertical-align: middle; /* ADDED: To help with consistent vertical text alignment */
    background-color: var(--input-background-color); 
    color: var(--input-text-color);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-group input[type="number"]:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 0.2rem var(--input-focus-shadow-color);
    background-color: var(--input-background-color); 
}

button#calculateBtn,
.quote-button {
    display: inline-block; 
    text-decoration: none; 
    background: linear-gradient(45deg, var(--accent-color), var(--accent-hover-color));
    color: white; 
    border: none;
    padding: 14px 20px; 
    border-radius: calc(var(--border-radius) - 6px);
    cursor: pointer;
    font-size: 1.15em; 
    font-weight: 700;
    transition: background 0.3s ease, transform 0.1s ease, box-shadow 0.2s ease;
    width: 100%;
    margin-top: 10px; 
    letter-spacing: 0.5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center; 
}

button#calculateBtn:hover,
.quote-button:hover {
    background: linear-gradient(45deg, var(--accent-hover-color), var(--accent-color)); 
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(93, 173, 226, 0.3); 
}

button#calculateBtn:active,
.quote-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.result-container {
    margin-top: 30px;
    padding: 25px; 
    background-color: var(--input-background-color); 
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: left;
}

.result-container h2 {
    color: var(--accent-color);
    margin-top: 0;
    margin-bottom: 15px; 
    font-size: 1.5em; 
    text-align: center;
}

#estimatedCost {
    font-size: 2.3em; 
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: 10px; 
    text-align: center;
    display: block;
}

#costBreakdown {
    font-size: 0.95em; 
    color: var(--secondary-text-color);
    text-align: center;
    margin-bottom: 20px; 
}

.quote-button { 
    margin-bottom: 20px;
    width: auto; 
    padding: 12px 25px; 
    display: block; 
    margin-left: auto;
    margin-right: auto;
    max-width: 300px; 
}


.disclaimer {
    font-size: 0.85em; 
    color: var(--disclaimer-text-color); 
    background-color: transparent; 
    border: none; 
    padding: 10px 0; 
    line-height: 1.5;
    text-align: center; 
}

.disclaimer strong {
    color: var(--secondary-text-color); 
    font-weight: 600;
}

footer {
    margin-top: 35px; 
    padding-top: 20px; 
    border-top: 1px solid rgba(255,255,255,0.1); 
    font-size: 0.85em; 
    color: var(--footer-text-color); 
    text-align: center; 
}

/* Responsive adjustments */
@media (max-width: 600px) {
    body {
        padding: 15px;
    }
    .container {
        padding: 20px 25px; 
        margin-top: 15px;
        margin-bottom: 15px;
    }
    .header-content {
        gap: 10px; 
    }
    #logo {
        max-height: 65px; 
    }
    header h1 {
        font-size: 1.7em; 
    }
    .sub-heading { 
        font-size: 0.85em;
    }
    #estimatedCost {
        font-size: 2em;
    }
    button#calculateBtn, .quote-button {
        padding: 12px 18px;
        font-size: 1.1em;
    }
}

@media (max-width: 480px) { 
    .header-content {
        gap: 8px; 
        padding: 0 5px; 
    }
    
    #logo {
        max-height: 45px; 
    }

    header h1 {
        font-size: 1.35em; 
    }
    .sub-heading { 
        font-size: 0.75em; 
    }
}