/* --- General Setup & Variables --- */
:root {
    --primary-color: #0052D4; /* A deeper, richer blue */
    --primary-light: #4364F7;
    --secondary-color: #556270; /* Softer grey for text */
    --background-color: #f7f8fc; /* Very light blue/grey */
    --card-background: #ffffff;
    --shadow-color: rgba(0, 82, 212, 0.1); /* Shadow based on primary color */
    --font-family: 'Poppins', sans-serif;

    /* New colors for cards */
    --green: #16a34a;
    --green-light: #22c55e;
    --amber: #d97706;
    --amber-light: #f59e0b;
    --violet: #7c3aed;
    --violet-light: #8b5cf6;
    --teal: #0d9488;
    --teal-light: #14b8a6;
}

/* --- Base & Body Styling --- */
body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--secondary-color); /* Default text color */
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Header Styling --- */
.site-header {
    text-align: center;
    padding: 60px 20px;
    background-color: var(--card-background);
    /* Adding a subtle gradient border at the bottom */
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    border-bottom: 3px solid transparent;
    border-image: linear-gradient(to right, var(--primary-light), var(--primary-color));
    border-image-slice: 1;
}

.site-header h1 {
    margin: 0;
    font-size: 2.8rem;
    font-weight: 600;
    /* Gradient text for the main heading */
    background: linear-gradient(to right, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.site-header p {
    font-size: 1.15rem;
    color: var(--secondary-color);
    margin-top: 10px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 300;
}

.site-footer {
    text-align: center;
    padding: 25px;
    margin-top: 40px;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* --- Main Tools Grid --- */
.tools-grid {
    display: grid;
    /* Creates responsive columns that are at least 320px wide */
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    padding: 50px 25px;
    max-width: 1300px; /* Increased max-width for wider layouts */
    margin: 0 auto; /* Centers the grid */
}

/* --- Tool Card Styling --- */
.tool-card {
    background-color: var(--card-background);
    border-radius: 16px; /* More rounded corners */
    padding: 30px;
    text-decoration: none;
    color: inherit;
    /* A more complex, softer shadow */
    box-shadow: 0 4px 12px var(--shadow-color), 0 2px 4px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #eef0f4;
    position: relative;
    overflow: hidden; /* To contain pseudo-elements */
}

/* Adding a subtle decorative element */
.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px; /* A colored top border */
    background: linear-gradient(to right, var(--primary-color), var(--primary-light));
    opacity: 0;
    transform: scaleX(0);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-8px); /* Lift a bit more */
    box-shadow: 0 10px 20px var(--shadow-color), 0 4px 8px rgba(0,0,0,0.05);
}

.tool-card:hover::before {
    opacity: 1;
    transform: scaleX(1);
}

.tool-card h2 {
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 1.4rem; /* Slightly smaller for balance */
    font-weight: 600;
    color: var(--primary-color); /* Make heading primary color */
}

.tool-card p {
    margin: 0;
    font-size: 0.95rem; /* Slightly smaller */
    color: var(--secondary-color);
    font-weight: 300;
}

/* --- Card-Specific Colors --- */

/* 1. Milestones (Green) */
/* Making the selector more specific */
a#card-milestones h2 {
    color: var(--green);
}
a#card-milestones::before {
    background: linear-gradient(to right, var(--green-light), var(--green));
}

/* 2. GIR (Amber) */
/* Making the selector more specific */
a#card-gir h2 {
    color: var(--amber);
}
a#card-gir::before {
    background: linear-gradient(to right, var(--amber-light), var(--amber));
}

/* 3. History (Purple) */
/* Making the selector more specific */
a#card-history h2 {
    color: var(--violet);
}
a#card-history::before {
    background: linear-gradient(to right, var(--violet-light), var(--violet));
}

/* 4. Questions (Teal) */
/* Making the selector more specific */
a#card-questions h2 {
    color: var(--teal);
}
a#card-questions::before {
    background: linear-gradient(to right, var(--teal-light), var(--teal));
}


/* --- Responsive Design for smaller screens --- */
@media (max-width: 768px) {
    .site-header {
        padding: 40px 15px;
    }
    
    .site-header h1 {
        font-size: 2.2rem;
    }
    
    .site-header p {
        font-size: 1rem;
    }
    
    .tools-grid {
        padding: 30px 15px;
        grid-template-columns: 1fr; /* Single column on mobile */
    }
}