/* ── Study Browser Styles ── */

.study-container {
    padding-top: 80px;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 2rem;
    padding-right: 2rem;
    min-height: calc(100vh - 300px);
}

.study-hero {
    margin-bottom: 1.5rem;
    text-align: left;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    transition: var(--transition);
    width: fit-content;
}

.back-link:hover {
    color: var(--accent-color);
    transform: translateX(-5px);
}

.section-title {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.study-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
}

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex !important;
    align-items: center;
    gap: 0.75rem;
    margin: 0 0 1rem 0 !important;
    /* Override global nav margin */
    max-width: none !important;
    /* Override global nav max-width */
    padding: 1rem 1.5rem !important;
    /* Override global nav padding */
    font-size: 1rem;
    color: var(--text-light);
    overflow-x: auto;
    white-space: nowrap;
    background: var(--theme-toggle-bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    justify-content: flex-start;
    width: 100% !important;
    box-sizing: border-box;
    /* Force flex for internal alignment but keep width */
}

.breadcrumb a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.breadcrumb a:hover {
    color: var(--text-color);
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-light);
    opacity: 0.5;
}

.breadcrumb-current {
    font-weight: 600;
    color: var(--text-color);
}

/* ── Browser Controls ── */
.browser-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.search-bar {
    position: relative;
    flex-grow: 1;
    max-width: 400px;
}

.search-bar i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-bar input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.8rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--font-main);
    transition: var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--theme-toggle-bg);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font-main);
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(90, 125, 149, 0.2);
}

.btn-primary:active {
    transform: translateY(0);
}

/* ── File Browser ── */
.file-browser {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.file-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.file-item:hover {
    transform: translateY(-5px);
    border-color: var(--accent-light);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.file-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.file-details h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.25rem;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.file-info {
    font-size: 0.8rem;
    color: var(--text-light);
    display: flex;
    gap: 1rem;
}

.file-actions {
    margin-top: auto;
    display: flex;
    justify-content: flex-end;
}

.action-btn {
    color: var(--accent-color);
    font-size: 1.2rem;
    transition: var(--transition);
}

.action-btn:hover {
    color: var(--text-color);
    transform: scale(1.1);
}

.folder-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--theme-toggle-bg);
    color: var(--accent-color);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

/* ── Empty State ── */
.loading-browser,
.empty-browser {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.loading-browser i {
    font-size: 3rem;
    color: var(--accent-color);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .study-container {
        padding-top: 100px;
    }

    .browser-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .search-bar {
        max-width: none;
    }

    .file-browser {
        grid-template-columns: 1fr;
    }
}