/* --- Ultra-Compatible Design System for Plant Grow Learn --- */
/* --- All modern features (variables, imports) have been removed for 100% compatibility. --- */

body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #FBFBF8; /* Warm Soil Off-White */
    color: #313131;            /* Charcoal Gray */
    line-height: 1.7;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 0;
}

h1, h2, h3 {
    font-family: Georgia, Times, serif;
    color: #2A402E; /* Deep Forest Green */
    font-weight: 700;
}

a {
    color: #5D9B62; /* Soft Fern Green */
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #2A402E; /* Deep Forest Green */
}

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

/* --- Header & Navigation --- */
.main-header {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://placehold.co/1200x500/5D9B62/FFFFFF?text=Lush+Garden') no-repeat center center/cover;
    color: #ffffff; /* Pure White */
    padding: 4rem 0;
    text-align: center;
}

.main-header .logo {
    font-family: Georgia, Times, serif;
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
}

.main-header .logo span {
    font-size: 1.8rem;
}

.main-header p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.95;
    font-family: Arial, Helvetica, sans-serif;
}

nav {
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    padding: 1rem 0;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

nav a {
    margin: 0 15px;
    font-weight: 700;
    color: #2A402E; /* Deep Forest Green */
    font-family: Arial, Helvetica, sans-serif;
}

/* --- Sections & Cards --- */
section {
    padding: 4rem 0;
    text-align: center;
}

section:nth-of-type(even) {
    background-color: #ffffff;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.section-subtitle {
    max-width: 700px;
    margin: 0 auto 3rem auto;
    color: #666;
    font-size: 1.1rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    text-align: left;
}

.card {
    background: #fff;