:root {
    --primary-color: #2563eb;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --hover-bg: #f1f5f9;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    margin-bottom: 2rem;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex-wrap: wrap;
}

.breadcrumbs a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.breadcrumbs a:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

.search-bar {
    position: relative;
    width: 100%;
    max-width: 300px;
}

.search-bar input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.file-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.file-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    border-color: var(--primary-color);
}

.file-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.file-icon.folder { color: #f59e0b; }
.file-icon.pdf { color: #ef4444; }
.file-icon.image { color: #10b981; }
.file-icon.doc { color: #3b82f6; }

.file-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.file-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: auto;
}

.preview-btn {
    margin-top: 0.75rem;
    padding: 0.4rem 0.8rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s;
}

.preview-btn:hover {
    background: var(--hover-bg);
    border-color: var(--text-secondary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    width: 100%;
    max-width: 900px;
    height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

.modal-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-weight: 600;
    font-size: 1.1rem;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    line-height: 1;
}

.close-modal:hover {
    color: var(--text-main);
}

.modal-body {
    flex: 1;
    background: #f1f5f9;
    padding: 0;
    overflow: hidden;
    position: relative;
}

.modal-body iframe, .modal-body img {
    width: 100%;
    height: 100%;
    border: none;
    object-fit: contain;
}

@media (max-width: 640px) {
    .container { padding: 1rem; }
    .grid-view { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 1rem; }
    .file-icon { font-size: 2.5rem; }
    header { flex-direction: column; align-items: stretch; }
    .search-bar { max-width: 100%; }
}