:root {
    --primary-color: #2ecc71;
    --primary-hover: #27ae60;
    --bg-color: #f9fbf9;
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: #ffffff;
    padding: 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
    color: var(--text-color);
}

.nav-container {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
}

.nav-tabs {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: flex-end;
}

.tab-btn {
    background: none;
    border: none;
    padding: 15px 20px;
    font-size: 1rem;
    font-weight: 600;
    color: #7f8c8d;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--primary-hover);
}

.tab-btn.active {
    color: var(--text-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
    max-width: 800px;
    margin: 30px auto;
    padding: 0 20px;
}

.tab-content.active {
    display: block;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.01);
    margin-bottom: 25px;
}

.description-card {
    font-size: 1.1rem;
    color: var(--text-color);
}

h2 {
    color: var(--text-color);
    margin-top: 0;
    font-size: 1.4rem;
}

h3 {
    margin-top: 0;
    font-size: 1.1rem;
    color: var(--text-color);
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.95rem;
}

input[type="text"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.radio-label input[type="radio"] {
    accent-color: var(--primary-color);
    width: 16px;
    height: 16px;
}

.hidden {
    display: none;
}

button.btn-submit {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    width: 100%;
}

button.btn-submit:hover {
    background-color: var(--primary-hover);
}

.spinner-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
}

.spinner {
    border: 4px solid rgba(0,0,0,0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-left-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
}

.score-text {
    font-weight: 600;
    color: #475569;
    background-color: #f1f5f9;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

th {
    background-color: #f8fafc;
    color: #64748b;
    font-weight: 600;
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

tr:hover td {
    background-color: #fdfdfd;
}

.bold-id {
    font-family: monospace;
    font-weight: 600;
    color: #334155;
    font-size: 0.95rem;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 4px;
    text-align: center;
    letter-spacing: 0.05em;
}

.badge-pass {
    background-color: #e6f4ea;
    color: #137333;
    border: 1px solid #c2e7cc;
}

.badge-fail {
    background-color: #fce8e6;
    color: #c5221f;
    border: 1px solid #fad2cf;
}

.error-block {
    background-color: #fff5f5;
    color: #c53030;
    border: 1px solid #fed7d7;
    padding: 15px;
    border-radius: 6px;
    margin-top: 20px;
}

.main-footer {
    background-color: transparent;
    padding: 30px 20px;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-left {
    flex: 1;
    min-width: 280px;
    font-size: 0.85rem;
    color: #7f8c8d;
    line-height: 1.4;
}

.footer-left p {
    margin: 0;
}

.footer-right {
    display: flex;
    align-items: center;
}

.footer-logos {
    display: flex;
    align-items: center;
    gap: 20px;
}

.footer-logos a {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.footer-logo-img {
    height: auto;
    max-height: 45px;
    width: auto;
    cursor: pointer;
    filter: grayscale(20%);
    transition: filter 0.2s ease, transform 0.2s ease;
}

.footer-logo-img:hover {
    filter: grayscale(0%);
    transform: scale(1.03);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.team-member {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 20px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.team-member:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.02);
}

.team-member h3 {
    margin: 0 0 5px 0;
    font-size: 1.2rem;
    color: var(--text-color);
}

.member-role {
    margin: 0 0 12px 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-hover);
}

.member-bio {
    margin: 0;
    font-size: 0.9rem;
    color: #5a6a85;
    line-height: 1.4;
}

.tab-link {
    text-decoration: none;
    padding: 15px 20px;
    font-size: 1rem;
    font-weight: 600;
    color: #7f8c8d;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    display: inline-block;
}

.tab-link:hover {
    color: var(--primary-hover);
}

.spinner-container {
    flex-direction: column; 
    gap: 15px;
}

.loading-message {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: #475569;
    text-align: center;
    background-color: #f0fdf4; 
    border: 1px solid #bbf7d0;
    padding: 10px 18px;
    border-radius: 6px;
    max-width: 500px;
}

.test-id-link {
    color: var(--primary-hover);
    text-decoration: none;
    border-bottom: 1px dashed transparent;
    transition: color 0.2s, border-color 0.2s;
}

.test-id-link:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}