/* Basic, clean styling for the LMS site */

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: #f4f5f7;
    color: #1a1a1a;
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px;
}

.navbar {
    background: #1f2937;
    color: #fff;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar a {
    color: #fff;
    margin-left: 16px;
}

.navbar .brand {
    font-weight: 700;
    font-size: 18px;
    margin-left: 0;
}

.card {
    background: #fff;
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    background: #2563eb;
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    text-decoration: none;
}

.btn:hover {
    background: #1d4ed8;
    text-decoration: none;
}

.btn-danger {
    background: #dc2626;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-secondary {
    background: #6b7280;
}

.btn-secondary:hover {
    background: #4b5563;
}

form {
    max-width: 480px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 16px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 15px;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid #e5e7eb;
}

th {
    background: #f9fafb;
    font-size: 14px;
}

.lesson-list {
    list-style: none;
    padding: 0;
}

.lesson-list li {
    padding: 12px;
    border-bottom: 1px solid #e5e7eb;
}

.lesson-list a {
    font-weight: 600;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    margin-bottom: 16px;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.empty-state {
    color: #6b7280;
    text-align: center;
    padding: 40px 0;
}

.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}