:root {
    --bg-color: #11131c;
    --card-bg: #1a1e2d;
    --text-primary: #ffffff;
    --text-secondary: #a0a5b5; /* softer gray */
    
    /* Subject Colors */
    --rust-color: #e35a35;
    --js-color: #f7df1e;
    --java-color: #f89820;
    --docker-color: #2496ED;
    --kafka-color: #00B39E;
    
    /* Badges */
    --rust-badge-bg: rgba(227, 90, 53, 0.15);
    --js-badge-bg: rgba(247, 223, 30, 0.15);
    --java-badge-bg: rgba(248, 152, 32, 0.15);
    --docker-badge-bg: rgba(36, 150, 237, 0.15);
    --kafka-badge-bg: rgba(0, 179, 158, 0.15);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.container {
    max-width: 1000px;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 4rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #c2c9e0);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.legend {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.rust-dot { background-color: var(--rust-color); box-shadow: 0 0 5px var(--rust-color); }
.js-dot { background-color: var(--js-color); box-shadow: 0 0 5px var(--js-color); }
.java-dot { background-color: var(--java-color); box-shadow: 0 0 5px var(--java-color); }
.docker-dot { background-color: var(--docker-color); box-shadow: 0 0 5px var(--docker-color); }
.kafka-dot { background-color: var(--kafka-color); box-shadow: 0 0 5px var(--kafka-color); }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: block;
    border-left: 4px solid transparent;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.card-content {
    padding: 2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.badge-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.count {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-top: auto;
}

/* Language specific styling */
.rust-card { border-left-color: var(--rust-color); }
.rust-card:hover { box-shadow: 0 8px 30px rgba(227, 90, 53, 0.15); }
.rust-badge { background-color: var(--rust-badge-bg); color: var(--rust-color); }

.js-card { border-left-color: var(--js-color); }
.js-card:hover { box-shadow: 0 8px 30px rgba(247, 223, 30, 0.15); }
.js-badge { background-color: var(--js-badge-bg); color: var(--js-color); }

.java-card { border-left-color: var(--java-color); }
.java-card:hover { box-shadow: 0 8px 30px rgba(248, 152, 32, 0.15); }
.java-badge { background-color: var(--java-badge-bg); color: var(--java-color); }

.docker-card { border-left-color: var(--docker-color); }
.docker-card:hover { box-shadow: 0 8px 30px rgba(36, 150, 237, 0.15); }
.docker-badge { background-color: var(--docker-badge-bg); color: var(--docker-color); }

.kafka-card { border-left-color: var(--kafka-color); }
.kafka-card:hover { box-shadow: 0 8px 30px rgba(0, 179, 158, 0.15); }
.kafka-badge { background-color: var(--kafka-badge-bg); color: var(--kafka-color); }