/**
 * University Digital Library - Clean Academic Stylesheet
 */
.udl-container {
    width: 100%;
    max-width: 1100px;
    margin: 24px auto;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #111827;
    box-sizing: border-box;
    direction: inherit;
    line-height: 1.6;
}

.udl-hero-header {
    background: #111827;
    color: #ffffff;
    border-radius: 16px;
    padding: 36px 24px;
    text-align: center;
    margin-bottom: 24px;
}

.udl-hero-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 0 0 10px 0;
    color: #ffffff;
}

.udl-hero-subtitle {
    margin: 0;
    opacity: 0.9;
    font-size: 1.05rem;
    color: #e5e7eb;
}

.udl-wizard-card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}

.udl-steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

@media (max-width: 768px) {
    .udl-steps-grid {
        grid-template-columns: 1fr;
    }
}

.udl-step-box {
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: #faf9f6;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
}

.udl-step-badge {
    font-weight: 700;
    font-size: 0.95rem;
    color: #111827;
}

.udl-select-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: #ffffff;
    font-size: 0.95rem;
    font-weight: 600;
    outline: none;
    color: #111827;
    transition: all 0.2s;
}

.udl-select-input:focus {
    border-color: #b45309;
    box-shadow: 0 0 0 2px rgba(180, 83, 9, 0.15);
}

.udl-select-input:disabled {
    background: #f3f4f6;
    color: #9ca3af;
    cursor: not-allowed;
}

.udl-action-wrap {
    margin-top: 24px;
    text-align: center;
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.udl-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #111827;
    color: #ffffff !important;
    font-weight: 700;
    font-size: 1rem;
    padding: 14px 32px;
    border-radius: 10px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.udl-btn-primary:hover {
    background: #000000;
    transform: translateY(-1px);
}

.udl-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #f3f4f6;
    color: #111827 !important;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 14px 24px;
    border-radius: 10px;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid #e5e7eb;
    transition: all 0.2s;
}

.udl-btn-secondary:hover {
    background: #e5e7eb;
}

/* Subject Live Container */
#udl_subject_live_container {
    margin-top: 28px;
}

.udl-subject-banner {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 16px;
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.03);
}

.udl-subject-title {
    font-size: 2rem;
    font-weight: 800;
    color: #111827;
    margin: 0 0 12px 0;
}

.udl-meta-badges {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    font-size: 0.88rem;
    font-weight: 700;
}

.udl-badge {
    padding: 4px 12px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.udl-badge-spec {
    background: #fffbeb;
    color: #b45309;
    border: 1px solid #fde68a;
}

.udl-badge-year {
    background: #f3f4f6;
    color: #1f2937;
    border: 1px solid #e5e7eb;
}

.udl-badge-sem {
    background: #eff6ff;
    color: #1d4ed8;
    border: 1px solid #bfdbfe;
}

.udl-subject-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 24px 0 20px 0;
}

@media (max-width: 640px) {
    .udl-subject-tabs {
        grid-template-columns: 1fr;
    }
}

.udl-tab-btn {
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    background: #ffffff;
    font-weight: 800;
    font-size: 1rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
    color: #111827;
}

.udl-tab-btn.active {
    background: #111827;
    color: #ffffff !important;
    border-color: #111827;
    box-shadow: 0 4px 12px rgba(17, 24, 39, 0.15);
}

.udl-tab-btn:hover:not(.active) {
    background: #f9fafb;
    border-color: #d1d5db;
}

.udl-resource-card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.udl-resource-card:hover {
    border-color: #111827;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.udl-resource-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 6px 0;
    color: #111827;
}

.udl-btn-file {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s;
}

.udl-btn-file-primary {
    background: #111827;
    color: #ffffff !important;
}

.udl-btn-file-primary:hover {
    background: #000000;
}

.udl-btn-file-solution {
    background: #059669;
    color: #ffffff !important;
}

.udl-btn-file-solution:hover {
    background: #047857;
}

.udl-btn-file-exam-sol {
    background: #7c3aed;
    color: #ffffff !important;
}

.udl-btn-file-exam-sol:hover {
    background: #6d28d9;
}

.udl-btn-file-outline {
    background: #f3f4f6;
    color: #111827 !important;
    border: 1px solid #e5e7eb;
}

.udl-btn-file-outline:hover {
    background: #e5e7eb;
}

.udl-hidden {
    display: none !important;
}

.udl-spinner {
    display: inline-block;
    width: 28px;
    height: 28px;
    border: 3px solid #e5e7eb;
    border-top-color: #b45309;
    border-radius: 50%;
    animation: udl-spin 0.8s linear infinite;
    margin: 20px auto;
}

@keyframes udl-spin {
    to { transform: rotate(360deg); }
}