:root {
    --primary: #2c3e50;
    --secondary: #34495e;
    --accent: #3498db;
    --bg: #ecf0f1;
    --text: #333;
    --card-bg: #fff;
    --border: #ddd;
    --success: #27ae60;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: var(--primary);
    color: #fff;
    padding: 1.5rem;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

main {
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h2 {
    margin-top: 0;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.grid-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.secondary-config {
    margin-top: 1rem;
}

.control-group {
    margin-bottom: 0.75rem;
}

.control-group label {
    display: block;
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.control-group input, .control-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    box-sizing: border-box;
    min-height: 44px;
}

.control-buttons {
    margin-top: 1rem;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.step-info {
    background: #eee;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
    font-weight: bold;
    color: #333;
}

.nav-links {
    margin-bottom: 20px;
}

.nav-links a {
    color: var(--accent);
    text-decoration: none;
    font-weight: bold;
}

#streaming-data, .nav-links {
    grid-column: 1 / -1;
}

@media (min-width: 1200px) {
    main {
        grid-template-columns: repeat(3, 1fr);
    }
}

.card {
    background: #f9f9f9;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 4px;
}

.card h3 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--secondary);
}

.hidden {
    display: none !important;
}

.table-container {
    max-height: 400px;
    overflow-y: auto;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 4px;
}

table {
    width: 100%;
    min-width: 600px;
    border-collapse: collapse;
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    table {
        min-width: unset;
    }
}

th, td {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background: #f4f4f4;
    position: sticky;
    top: 0;
}

.result-card {
    background: var(--secondary);
    color: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.bin-result {
    grid-column: span 2;
}

#acc-bin {
    font-size: 0.85rem;
}

.result-item .label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    opacity: 0.8;
}

.result-item .value {
    font-size: 1.2rem;
    font-weight: bold;
    font-family: 'Courier New', Courier, monospace;
}

button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
    min-height: 44px;
}

button:hover {
    background: #2980b9;
}

footer {
    background: #000;
    color: #0f0;
    padding: 1rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    height: 150px;
    overflow-y: scroll;
}

pre {
    margin: 0;
    white-space: pre-wrap;
}

@media (max-width: 1200px) {
    #results {
        grid-column: span 2;
    }
}

@media (max-width: 900px) {
    #results {
        grid-column: span 1 !important;
    }
}

@media (max-width: 1024px) {
    .hide-tablet {
        display: none !important;
    }
}

@media (max-width: 768px) {
    .hide-mobile {
        display: none !important;
    }
    main {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
    .grid-container {
        grid-template-columns: 1fr;
    }
    .control-buttons {
        flex-direction: column;
    }
    .control-buttons button {
        width: 100%;
    }
    footer {
        height: 120px;
    }
    .bin-result {
        grid-column: span 1;
    }
    #acc-bin {
        font-size: 0.7rem !important;
        word-break: break-all;
    }
}