:root {
    /* LIGHT THEME (Default) */
    --primary: #008B8B;      /* Teal from logo */
    --primary-hover: #006666;
    --secondary: #708090;    /* Slate Grey */
    --platinum: #E5E4E2;     /* Silver accent */
    --bg-body: #ffffff;
    --text-main: #333333;
    --card-bg: #f8f9fa;
    --border-color: #ddd;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

[data-theme="dark"] {
    /* DARK THEME */
    --primary: #20B2AA;      /* Brighter Teal for dark backgrounds */
    --primary-hover: #48D1CC;
    --secondary: #A9A9A9;
    --bg-body: #121212;      /* Deep dark grey */
    --text-main: #E0E0E0;    /* Off-white */
    --card-bg: #1E1E1E;
    --border-color: #333;
    --shadow: 0 4px 6px rgba(0,0,0,0.5);
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s;
    margin: 0;
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 2px solid var(--primary);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.navbar a { text-decoration: none; color: var(--text-main); font-weight: 600; margin-left: 20px; }
.btn-primary {
    background-color: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-weight: bold;
}
.btn-primary:hover { background-color: var(--primary-hover); }

/* Theme Toggle */
#theme-toggle { background: none; border: none; color: var(--text-main); cursor: pointer; font-size: 1.2rem; }

/* Quote Form Grid */
.quote-form-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 30px;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    border-top: 5px solid var(--primary);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.full-width { grid-column: span 2; }

label { display: block; margin-bottom: 5px; font-weight: bold; color: var(--primary); }
input, select, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background: var(--bg-body);
    color: var(--text-main);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .form-grid { grid-template-columns: 1fr; }
    .full-width { grid-column: span 1; }
}