/* ==============================================
   Simple Course Builder — Frontend Styles
   ============================================== */

/* Course List */
.scb-course-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin: 24px 0;
}

.scb-course-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,.06);
    transition: box-shadow .2s, transform .2s;
    display: flex;
    flex-direction: column;
}
.scb-course-card:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,.1);
    transform: translateY(-2px);
}
.scb-card-thumb img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}
.scb-card-body {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.scb-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 8px;
    line-height: 1.4;
}
.scb-card-title a { color: inherit; text-decoration: none; }
.scb-card-title a:hover { color: #2563eb; }
.scb-card-excerpt {
    color: #6b7280;
    font-size: .9rem;
    margin: 0 0 12px;
    flex: 1;
}
.scb-card-meta {
    display: flex;
    gap: 12px;
    font-size: .85rem;
    color: #6b7280;
    margin-bottom: 12px;
}
.scb-card-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
}

/* Buttons */
.scb-btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: .9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: background .15s, opacity .15s;
    border: none;
}
.scb-btn-primary  { background: #2563eb; color: #fff; }
.scb-btn-primary:hover { background: #1d4ed8; color: #fff; }
.scb-btn-secondary { background: #f3f4f6; color: #374151; border: 1px solid #d1d5db; }
.scb-btn-secondary:hover { background: #e5e7eb; }
.scb-btn-large { padding: 12px 24px; font-size: 1rem; }

/* Badges */
.scb-badge { font-size: .78rem; padding: 3px 8px; border-radius: 20px; font-weight: 500; }
.scb-badge-enrolled { background: #d1fae5; color: #065f46; }

/* Course Hero */
.scb-course-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
    align-items: start;
}
@media (max-width: 600px) {
    .scb-course-hero { grid-template-columns: 1fr; }
    .scb-course-list { grid-template-columns: 1fr; }
}
.scb-course-thumbnail img { width: 100%; border-radius: 10px; }
.scb-course-title { font-size: 1.6rem; margin: 0 0 12px; }
.scb-course-excerpt { color: #6b7280; margin-bottom: 12px; }
.scb-course-meta { display: flex; gap: 16px; font-size: .9rem; color: #6b7280; margin-bottom: 16px; }

/* Curriculum */
.scb-curriculum-title { font-size: 1.25rem; margin: 0 0 16px; border-bottom: 2px solid #e5e7eb; padding-bottom: 8px; }
.scb-module { border: 1px solid #e5e7eb; border-radius: 8px; margin-bottom: 8px; overflow: hidden; }
.scb-module-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    background: #f9fafb;
    cursor: pointer;
    user-select: none;
    font-weight: 600;
}
.scb-module-header:hover { background: #f3f4f6; }
.scb-module-toggle { font-size: .8em; transition: transform .2s; width: 16px; }
.scb-module-name { flex: 1; }
.scb-module-lesson-count { font-size: .8rem; color: #6b7280; font-weight: 400; }

.scb-lesson-list {
    list-style: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    max-height: 2000px;
    transition: max-height .3s ease;
}
.scb-lesson-list.scb-collapsed { max-height: 0; }

.scb-lesson-row { border-top: 1px solid #f3f4f6; }
.scb-lesson-link, .scb-lesson-locked {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    font-size: .9rem;
    text-decoration: none;
    color: inherit;
}
.scb-lesson-link:hover { background: #f0f7ff; color: #2563eb; }
.scb-lesson-locked { color: #9ca3af; cursor: default; }
.scb-lesson-name { flex: 1; }
.scb-lock-icon { font-size: .85rem; }

/* No Access */
.scb-no-access {
    text-align: center;
    padding: 48px 24px;
    background: #fafafa;
    border: 2px dashed #d1d5db;
    border-radius: 12px;
    margin: 24px 0;
}
.scb-no-access-icon { font-size: 3rem; margin-bottom: 12px; }
.scb-no-access-title { font-size: 1.5rem; margin: 0 0 8px; }
.scb-no-access-message { color: #6b7280; margin-bottom: 20px; }
.scb-no-access-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }