:root {
    --color-bg: #f8f9fa;
    --color-text: #333;
    --color-text-light: #666;
    --color-card-bg: #fff;
    --color-border: #e1e4e8;
    
    /* Category Colors */
    --cat-network: #70AD47;
    --cat-iam: #008080;
    --cat-engineer: #fa8e36;
    --cat-asset: #e4ac03;
    --cat-mgmt: #2a2a2a;
    --cat-testing: #683e9b;
    --cat-software: #6bb3f6;
    --cat-blueops: #2e5688;
    --cat-redops: #c0514d;
    --cat-unknown: #999;
    
    /* Level Colors */
    --level-beginner: #28a745;
    --level-intermediate: #fd7e14;
    --level-expert: #dc3545;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: #fff;
    padding: 40px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 10px;
}

header p {
    color: var(--color-text-light);
    font-size: 1.1rem;
}

.controls {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.search-box, .filter-box {
    flex: 1;
    min-width: 250px;
    max-width: 500px;
}

input[type="text"], select {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: #fff;
    font-family: inherit;
}

input[type="text"]:focus, select:focus {
    outline: none;
    border-color: var(--cat-blueops);
    box-shadow: 0 0 0 3px rgba(46, 86, 136, 0.1);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    padding-bottom: 60px;
}

.cert-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.cert-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.cert-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background-color: var(--cat-unknown); /* Default */
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.cert-abbr {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #000;
}

.cert-name {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 12px;
    flex-grow: 1;
}

.cert-details {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 16px;
    background: #f5f7fa;
    padding: 10px;
    border-radius: 6px;
}

.cert-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    color: #888;
}

.cert-level {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 12px;
    color: #fff;
    background-color: #999;
    text-transform: uppercase;
}

.level-beginner { background-color: var(--level-beginner); }
.level-intermediate { background-color: var(--level-intermediate); }
.level-expert { background-color: var(--level-expert); }

.cert-link {
    display: inline-block;
    text-decoration: none;
    color: #fff;
    background-color: #333;
    padding: 8px 16px;
    border-radius: 6px;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: auto;
    transition: background-color 0.2s;
}

.cert-link:hover {
    background-color: #000;
}

.hidden {
    display: none;
}

#noResults {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.2rem;
    margin-top: 40px;
}

footer {
    background-color: #fff;
    border-top: 1px solid var(--color-border);
    padding: 20px 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: auto;
}

footer a {
    color: var(--cat-blueops);
    text-decoration: none;
}

/* Category-specific Border Colors */
.cat-network::before { background-color: var(--cat-network); }
.cat-iam::before { background-color: var(--cat-iam); }
.cat-engineer::before { background-color: var(--cat-engineer); }
.cat-asset::before { background-color: var(--cat-asset); }
.cat-mgmt::before { background-color: var(--cat-mgmt); }
.cat-testing::before { background-color: var(--cat-testing); }
.cat-software::before { background-color: var(--cat-software); }
.cat-blueops::before { background-color: var(--cat-blueops); }
.cat-redops::before { background-color: var(--cat-redops); }

.viz-link {
    display: inline-block;
    background-color: #e1e4e8;
    color: #333;
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background-color 0.2s;
}

.viz-link:hover {
    background-color: #d0d7de;
    color: #000;
}