/* ===== Study Buddy Search Widget ===== */

.study-buddy {
    background: var(--color-surface, #fff);
    border: 1px solid var(--color-border, #e1e4e8);
    border-radius: var(--radius-lg, 12px);
    padding: 1.25rem 1.5rem;
    margin-top: 1.25rem;
}

.study-buddy-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.study-buddy-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0;
    color: var(--color-text, #1f2937);
}

.study-buddy-icon {
    width: 20px;
    height: 20px;
    color: var(--color-primary, #3578e5);
    flex-shrink: 0;
}

.study-buddy-form {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0;
}

.study-buddy-input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border, #e1e4e8);
    border-radius: var(--radius-md, 8px);
    font-size: 0.875rem;
    font-family: inherit;
    background: var(--color-bg, #fff);
    color: var(--color-text, #1f2937);
    min-width: 0;
}

.study-buddy-input:focus {
    outline: none;
    border-color: var(--color-primary, #3578e5);
    box-shadow: 0 0 0 2px rgba(53, 120, 229, 0.15);
}

.study-buddy-input::placeholder {
    color: var(--color-text-muted, #9ca3af);
}

.study-buddy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    background: var(--color-primary, #3578e5);
    color: #fff;
    border: none;
    border-radius: var(--radius-md, 8px);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: opacity var(--transition, 200ms);
}

.study-buddy-btn:hover {
    opacity: 0.9;
}

.study-buddy-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Results */
.study-buddy-results {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.study-buddy-result {
    display: block;
    padding: 0.875rem 1rem;
    background: var(--color-bg, #f9fafb);
    border: 1px solid var(--color-border, #e1e4e8);
    border-radius: var(--radius-md, 8px);
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.study-buddy-result:hover {
    border-color: var(--color-primary, #3578e5);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.05));
}

.study-buddy-result-breadcrumb {
    font-size: 0.75rem;
    color: var(--color-text-muted, #9ca3af);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.study-buddy-result-breadcrumb .separator {
    color: var(--color-text-muted, #9ca3af);
}

.study-buddy-result-heading {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary, #3578e5);
    margin-bottom: 0.25rem;
}

.study-buddy-result-excerpt {
    font-size: 0.825rem;
    line-height: 1.5;
    color: var(--color-text-secondary, #4b5563);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.study-buddy-result-similarity {
    font-size: 0.7rem;
    color: var(--color-text-muted, #9ca3af);
    margin-top: 0.375rem;
}

/* States */
.study-buddy-empty {
    text-align: center;
    padding: 1rem 0.5rem;
    color: var(--color-text-muted, #9ca3af);
    font-size: 0.85rem;
}

.study-buddy-empty a {
    color: var(--color-primary, #3578e5);
    text-decoration: none;
}

.study-buddy-empty a:hover {
    text-decoration: underline;
}

.study-buddy-error {
    text-align: center;
    padding: 0.75rem;
    color: var(--color-danger, #dc2626);
    background: rgba(220, 38, 38, 0.05);
    border-radius: var(--radius-md, 8px);
    font-size: 0.85rem;
    margin-top: 0.75rem;
}

.study-buddy-loading {
    text-align: center;
    padding: 1rem;
    color: var(--color-text-muted, #9ca3af);
    font-size: 0.85rem;
}

/* Validation */
.study-buddy-validation {
    color: var(--color-danger, #dc2626);
    font-size: 0.8rem;
    margin-top: 0.375rem;
}

/* Discussion fallback */
.study-buddy-fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border, #e1e4e8);
}

.study-buddy-fallback a {
    color: var(--color-primary, #3578e5);
    font-size: 0.85rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.study-buddy-fallback a:hover {
    text-decoration: underline;
}

/* Admin Page */
.study-buddy-admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4, 1rem);
    margin-bottom: var(--space-6, 1.5rem);
}

.study-buddy-admin-card {
    background: var(--color-surface, #fff);
    border: 1px solid var(--color-border, #e1e4e8);
    border-radius: var(--radius-lg, 12px);
    padding: var(--space-5, 1.25rem);
}

.study-buddy-admin-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.study-buddy-admin-stat {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text, #1f2937);
}

.study-buddy-admin-sub {
    font-size: 0.8rem;
    color: var(--color-text-muted, #9ca3af);
}

.study-buddy-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--color-border, #e1e4e8);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.study-buddy-progress-fill {
    height: 100%;
    background: var(--color-primary, #3578e5);
    border-radius: 3px;
    transition: width 0.3s;
}

/* Highlight-to-Ask Tooltip */
.highlight-ask-tooltip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4rem 0.75rem;
    background: var(--color-primary, #3578e5);
    color: #fff;
    border: none;
    border-radius: var(--radius-md, 8px);
    font-size: 0.8rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    animation: tooltip-pop 0.15s ease-out;
    user-select: none;
    -webkit-user-select: none;
}

.highlight-ask-tooltip:hover {
    opacity: 0.9;
}

@keyframes tooltip-pop {
    from { opacity: 0; transform: translate(-50%, -100%) scale(0.9); }
    to   { opacity: 1; transform: translate(-50%, -100%) scale(1); }
}

html.dark .highlight-ask-tooltip {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Responsive */
@media (max-width: 640px) {
    .study-buddy {
        padding: 1rem;
    }

    .study-buddy-form {
        flex-direction: column;
    }

    .study-buddy-btn {
        justify-content: center;
    }
}