/* ===========================
   Root Variables
   =========================== */
:root {
    /* Typography */
    --font-family-base: "Arial", sans-serif;
    --font-lg: 3rem;
    --font-md: 1.25rem;
    --font-sm: 1rem;

    /* Colors */
    --color-bg: #f9f9f9;
    --color-text: #333;
    --color-primary: #007bff;
    --color-primary-hover: #0056b3;
    --color-white: #fff;
    --color-dark: #222;
    --color-overlay: rgba(0, 0, 0, 0.5);

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 15px;

    /* Spacing */
    --section-padding: 60px;
    --border-radius: 6px;

    /* Transitions & Shadow */
    --transition-fast: 0.2s ease;
    --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.1);
}

/* ===========================
     Responsive Overrides
     =========================== */
@media (max-width: 768px) {
    :root {
        --font-lg: 2rem;
        --font-md: 1rem;
        --font-sm: 0.875rem;
        --section-padding: 30px;
    }
}

/* ===========================
     Global Reset & Base Styles
     =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    font-family: var(--font-family-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
    display: block;
}

/* ===========================
     Layout Helpers
     =========================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.main-content {
    flex: 1;
}

/* ===========================
     Typography Utilities
     =========================== */
.text-center {
    text-align: center;
}
.text-uppercase {
    text-transform: uppercase;
}

/* ===========================
     Buttons
     =========================== */
button,
.btn {
    padding: 10px 20px;
    font-size: var(--font-sm);
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

button:hover,
.btn:hover {
    background-color: var(--color-primary-hover);
}

/* ===========================
     Hero Section Example
     =========================== */
.hero {
    position: relative;
    height: 100vh;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    color: var(--color-white);
}

.hero .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay);
    z-index: 1;
}

.hero .content {
    position: relative;
    z-index: 2;
    padding: 20px;
}
.heading {
    font-size: var(--font-lg);
}
.content {
    font-size: var(--font-sm);
}
/* ===========================
     Footer
     =========================== */
footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    text-align: center;
    padding: 20px 0;
    margin-top: auto;
}

/* ===========================
     Card & Grid (optional)
     =========================== */

.grid {
    display: grid;
    gap: 20px;
}
@media (min-width: 768px) {
    .grid-cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}