/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 1440 Fluid Container */
body {
    font-family: "Times New Roman", Georgia, serif;
    font-size: 17px;
    padding: 30px;
    background-color: var(--second-color);
}

.container {
    width: 90%;
    max-width: 1440px;
    margin: 0 auto;
}

/* 12-Column Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    margin-bottom: 45px;
    gap: 20px;
}

/* Column Spans */
.col-1  { grid-column: span 1; }
.col-2  { grid-column: span 2; }
.col-3  { grid-column: span 3; }
.col-4  { grid-column: span 4; }
.col-5  { grid-column: span 5; }
.col-6  { grid-column: span 6; }
.col-7  { grid-column: span 7; }
.col-8  { grid-column: span 8; }
.col-9  { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* Header */
header {
    font-size: 1.4rem;
    font-weight: bold;
}

.demo-block {
    background-color: var(--first-color);
    color: #ffffff;
    padding: 30px;
    margin-bottom: 25px;
    text-align: center;
    height: 180px;
}

/* Navigation Cells */
.demo-cell {
    background-color: var(--fourth-color);
    text-align: center;
    padding: 25px;
    font-weight: bold;
    border: 3px solid white;
    border-radius: 6px;
}

.demo-cell a {
    font-size: 1rem;
    display: block;
    text-decoration: none;
    color: #000;
}

.demo-cell:hover {
    background-color: var(--first-color);
}

/* Hero Section */
.hero {
    padding: 50px;
    border: 3px solid white;
    border-radius: 6px;
    text-align: center;
    background-color: var(--fourth-color);
}

/* Content Sections */
.content {
    background-color: var(--fourth-color);
    padding: 70px;
    border: 3px solid white;
    border-radius: 6px;
    text-align: center;
}

/* Sidebar */
.sidebar {
    background-color: var(--fourth-color);
    padding: 30px;
    border: 3px solid white;
    border-radius: 6px;
    text-align: center;
}

/* Cards */
.card {
    background-color: var(--third-color);
    padding: 25px;
    border: 3px solid white;
    border-radius: 6px;
    text-align: center;
    color: #fff;
}

.card2 {
    background-color: var(--third-color);
    padding: 25px;
    border: 3px solid white;
    border-radius: 6px;
    text-align: center;
    color: #fff;
}

/* Headings and Paragraphs */
h1,
h2,
h3 {
    margin-bottom: 15px;
}

p {
    line-height: 1.6;
}

/* Height Utilities */

.height-100  { height: 100px; }
.height-200  { height: 200px; }
.height-300  { height: 300px; }
.height-400  { height: 400px; }
.height-500  { height: 500px; }
.height-600  { height: 600px; }