:root {
    --primary-color: #4f46e5;
    --bg-light: #f8fafc;
    --card-bg: #ffffff;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
}

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

/* Header */
.main-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
}
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}
.login-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s;
}
.login-btn:hover {
    background-color: #4338ca;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 80px 0;
}
.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}
.hero-subtitle {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-light);
}

/* Categories Section */
.categories-section {
    padding-bottom: 80px;
}
.section-title {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 40px;
}
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}
.category-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    text-decoration: none;
    color: var(--text-dark);
    transition: transform 0.3s, box-shadow 0.3s;
}
.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}
.logo-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 15px auto;
    background-color: #eef2ff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.logo-wrapper img {
    width: 45px;
    height: 45px;
    object-fit: contain;
}
.card-title {
    font-weight: 600;
}
.no-data-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    color: var(--text-light);
}

/* ==================
   Test List Page Styles (NEW CODE ADDED HERE)
   ================== */
.tests-list-container {
    max-width: 800px;
    margin: 0 auto;
    padding-bottom: 80px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.test-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.test-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.test-card-details h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.test-card-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.test-card-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.start-test-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s;
    white-space: nowrap;
}

.start-test-btn:hover {
    background-color: #4338ca;
}


/* Footer */
.main-footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Mobile Friendly */
@media (max-width: 640px) {
    .hero-title { font-size: 2.2rem; }
    .logo { font-size: 1.5rem; }
    .categories-grid { grid-template-columns: repeat(2, 1fr); }

    /* Test card responsive */
    .test-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    .start-test-btn {
        width: 100%;
        text-align: center;
    }
}