/* ================================================================
   RESET & BASE
================================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --green-50:       #f0fdf4;
    --green-100:      #dcfce7;
    --green-500:      #22c55e;
    --green-600:      #16a34a;
    --green-700:      #15803d;
    --green-800:      #166534;
    --green-900:      #14532d;

    --color-bg:       #f8fafb;
    --color-surface:  #ffffff;
    --color-border:   #e2e8f0;
    --color-primary:  var(--green-600);
    --color-primary-hv: var(--green-700);
    --color-text:     #0f172a;
    --color-muted:    #64748b;
    --color-danger:   #dc2626;
    --color-danger-hv:#b91c1c;
    --color-success:  var(--green-600);
    --color-warn:     #d97706;

    --radius:         10px;
    --radius-lg:      16px;
    --shadow-sm:      0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow:         0 4px 6px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.04);
    --shadow-md:      0 10px 25px rgba(0,0,0,.08), 0 4px 10px rgba(0,0,0,.05);
    --shadow-lg:      0 20px 40px rgba(0,0,0,.10), 0 8px 16px rgba(0,0,0,.06);
    --transition:     .2s ease;
}

html { font-size: 16px; }

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ================================================================
   HEADER
================================================================ */
.site-header {
    background: linear-gradient(135deg, var(--green-900) 0%, var(--green-700) 100%);
    color: #fff;
    padding: 0 2rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 20px rgba(21,128,61,.3);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: .02em;
    display: flex;
    align-items: center;
    gap: .6rem;
}

.site-header .logo i {
    font-size: 1.3rem;
    color: var(--green-500);
}

.site-header .logo span { color: rgba(255,255,255,.6); font-weight: 400; }

.site-header nav {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.site-header nav a {
    color: rgba(255,255,255,.8);
    font-size: .875rem;
    transition: color var(--transition);
    display: flex;
    align-items: center;
    gap: .35rem;
}

.site-header nav a:hover { color: #fff; text-decoration: none; }

.btn-admin-header {
    background: rgba(255,255,255,.15);
    border: 1px solid rgba(255,255,255,.25);
    color: #fff !important;
    padding: .4rem .9rem;
    border-radius: var(--radius);
    font-size: .8rem;
    font-weight: 600;
    transition: background var(--transition), border-color var(--transition);
    backdrop-filter: blur(4px);
}

.btn-admin-header:hover {
    background: rgba(255,255,255,.25) !important;
    border-color: rgba(255,255,255,.4);
}

/* ================================================================
   MAIN CONTENT
================================================================ */
main {
    flex: 1;
    max-width: 1100px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

/* ================================================================
   PAGE TITLE
================================================================ */
.page-title {
    margin-bottom: 1.5rem;
}

.page-title h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: .6rem;
}

.page-title h1 i { color: var(--color-primary); }

.page-title p {
    color: var(--color-muted);
    font-size: .9rem;
    margin-top: .25rem;
}

/* ================================================================
   BREADCRUMB
================================================================ */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .4rem;
    font-size: .875rem;
    margin-bottom: 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: .65rem 1rem;
    box-shadow: var(--shadow-sm);
}

.breadcrumb i { color: var(--color-primary); font-size: .85rem; }
.breadcrumb a { color: var(--color-primary); font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--color-border); font-size: .8rem; }
.breadcrumb .current { color: var(--color-text); font-weight: 600; }

/* ================================================================
   CARD / PANEL
================================================================ */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

.card-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    font-weight: 600;
    font-size: .95rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: linear-gradient(to right, #f8fafb, #ffffff);
}

.card-header i { color: var(--color-primary); }

.card-body { padding: 1.5rem; }

/* ================================================================
   BADGE
================================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: .2rem .6rem;
    border-radius: 999px;
    font-size: .75rem;
    font-weight: 600;
}

.badge-green { background: var(--green-100); color: var(--green-700); }
.badge-gray  { background: #f1f5f9; color: var(--color-muted); }
.badge-red  { background: #fef2f2; color: #991b1b; }
.badge-warn { background: #fffbeb; color: #92400e; }

/* ================================================================
   FILE BROWSER — CARTELLE
================================================================ */
.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.folder-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .6rem;
    cursor: pointer;
    transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
    text-align: center;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.folder-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--green-500);
    transform: translateY(-2px);
    text-decoration: none;
}

.folder-item .folder-icon-wrap {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--green-100), var(--green-50));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--green-100);
}

.folder-item .folder-icon-wrap i {
    font-size: 1.6rem;
    color: var(--green-600);
}

.folder-item .folder-name {
    font-size: .82rem;
    font-weight: 600;
    color: var(--color-text);
    word-break: break-word;
    line-height: 1.3;
}

/* ================================================================
   FILE TABLE
================================================================ */
.file-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
}

.file-table th {
    text-align: left;
    padding: .7rem 1.25rem;
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--color-muted);
    border-bottom: 2px solid var(--color-border);
    background: #f8fafb;
}

.file-table td {
    padding: .85rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

.file-table tr:last-child td { border-bottom: none; }

.file-table tbody tr {
    transition: background var(--transition);
}

.file-table tbody tr:hover td {
    background: var(--green-50);
}

.file-table tbody tr:nth-child(even) td {
    background: #fafbfc;
}

.file-table tbody tr:nth-child(even):hover td {
    background: var(--green-50);
}

.file-name-cell {
    display: flex;
    align-items: center;
    gap: .65rem;
}

.file-name-cell .file-type-icon {
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-name-cell .file-type-icon i {
    font-size: .95rem;
    color: var(--color-muted);
}

.file-name-cell .file-label { font-weight: 500; }
.file-meta { color: var(--color-muted); font-size: .82rem; }

/* ================================================================
   DOWNLOAD BUTTON
================================================================ */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .4rem .9rem;
    background: linear-gradient(135deg, var(--green-600), var(--green-700));
    color: #fff;
    border-radius: var(--radius);
    font-size: .8rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: box-shadow var(--transition), transform var(--transition);
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(22,163,74,.25);
}

.btn-download:hover {
    box-shadow: 0 4px 14px rgba(22,163,74,.35);
    transform: translateY(-1px);
    text-decoration: none;
    color: #fff;
}

/* ================================================================
   EMPTY STATE
================================================================ */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--color-muted);
}

.empty-state .empty-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--green-100), var(--green-50));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    border: 1px solid var(--green-100);
}

.empty-state .empty-icon i {
    font-size: 1.8rem;
    color: var(--green-600);
}

.empty-state p { font-size: .95rem; margin-top: .25rem; }

/* ================================================================
   MODAL
================================================================ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(3px);
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 460px;
    padding: 2rem;
    position: relative;
    animation: modalIn .22s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(-20px) scale(.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
    position: absolute;
    top: 1rem; right: 1rem;
    background: #f1f5f9;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    font-size: .85rem;
    cursor: pointer;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), color var(--transition);
}

.modal-close:hover { background: #e2e8f0; color: var(--color-text); }

.modal-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--green-100), var(--green-50));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    border: 1px solid var(--green-100);
}

.modal-icon i { font-size: 1.4rem; color: var(--green-600); }

.modal h2 { font-size: 1.15rem; margin-bottom: .35rem; }
.modal p  { font-size: .875rem; color: var(--color-muted); margin-bottom: 1.25rem; line-height: 1.5; }

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: .6rem;
    margin-top: 1.25rem;
}

/* ================================================================
   FORM ELEMENTS
================================================================ */
.form-group { margin-bottom: 1rem; }

.form-group label {
    display: block;
    font-size: .825rem;
    font-weight: 700;
    margin-bottom: .4rem;
    color: var(--color-text);
    letter-spacing: .01em;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group select,
.form-group input[type="file"] {
    width: 100%;
    padding: .65rem .9rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    font-size: .9rem;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--green-500);
    box-shadow: 0 0 0 3px rgba(34,197,94,.12);
}

.form-group input[type="file"] {
    padding: .5rem .9rem;
    cursor: pointer;
    color: var(--color-muted);
}

/* ================================================================
   BUTTONS
================================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .6rem 1.2rem;
    border-radius: var(--radius);
    font-size: .875rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
    text-align: center;
    justify-content: center;
    white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
    background: linear-gradient(135deg, var(--green-600), var(--green-700));
    color: #fff;
    box-shadow: 0 2px 8px rgba(22,163,74,.25);
}

.btn-primary:hover {
    box-shadow: 0 4px 14px rgba(22,163,74,.35);
    text-decoration: none;
    color: #fff;
}

.btn-secondary {
    background: #f1f5f9;
    color: var(--color-muted);
    border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
    background: #e2e8f0;
    color: var(--color-text);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444, var(--color-danger));
    color: #fff;
    box-shadow: 0 2px 8px rgba(220,38,38,.2);
}

.btn-danger:hover {
    box-shadow: 0 4px 14px rgba(220,38,38,.3);
    text-decoration: none;
    color: #fff;
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b, var(--color-warn));
    color: #fff;
    box-shadow: 0 2px 8px rgba(217,119,6,.2);
}

.btn-warning:hover {
    box-shadow: 0 4px 14px rgba(217,119,6,.3);
    text-decoration: none;
    color: #fff;
}

.btn-full { width: 100%; }
.btn-sm { padding: .35rem .75rem; font-size: .78rem; }

/* ================================================================
   ALERTS
================================================================ */
.alert {
    padding: .85rem 1.1rem;
    border-radius: var(--radius);
    font-size: .875rem;
    margin-bottom: 1.25rem;
    border-left: 4px solid transparent;
    display: flex;
    align-items: center;
    gap: .65rem;
}

.alert i { font-size: 1rem; flex-shrink: 0; }

.alert-success {
    background: var(--green-50);
    border-color: var(--green-500);
    color: var(--green-800);
}

.alert-error {
    background: #fef2f2;
    border-color: var(--color-danger);
    color: #991b1b;
}

.alert-warn {
    background: #fffbeb;
    border-color: var(--color-warn);
    color: #92400e;
}

/* ================================================================
   LOGIN PAGE
================================================================ */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--green-900) 0%, var(--green-700) 50%, var(--green-600) 100%);
    padding: 1.5rem;
}

.login-box {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
}

.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .6rem;
    margin-bottom: 1.75rem;
}

.login-logo i {
    font-size: 2rem;
    color: var(--green-600);
}

.login-logo span {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
}

.login-box h1 {
    font-size: 1.3rem;
    margin-bottom: .3rem;
    text-align: center;
}

.login-box .login-sub {
    font-size: .85rem;
    color: var(--color-muted);
    margin-bottom: 1.75rem;
    text-align: center;
}

/* ================================================================
   ADMIN TOOLBAR
================================================================ */
.admin-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

/* ================================================================
   FOLDER TREE (modale sposta)
================================================================ */
.folder-tree {
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    max-height: 240px;
    overflow-y: auto;
    background: #f8fafb;
}

.tree-item {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .55rem .85rem;
    cursor: pointer;
    font-size: .875rem;
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
    user-select: none;
}

.tree-item:last-child { border-bottom: none; }

.tree-item:hover { background: var(--green-50); }

.tree-item.selected {
    background: var(--green-100);
    color: var(--green-800);
    font-weight: 600;
}

.tree-item i { color: var(--green-600); font-size: .95rem; }

.tree-item .tree-indent { display: inline-block; width: 16px; flex-shrink: 0; }

/* ================================================================
   DISK SPACE
================================================================ */
.disk-section { margin-top: 2rem; }

.disk-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.disk-stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.disk-stat-card .stat-label {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--color-muted);
    margin-bottom: .35rem;
}

.disk-stat-card .stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
}

.disk-bar-wrap {
    background: var(--color-border);
    border-radius: 999px;
    height: 10px;
    overflow: hidden;
    margin: .75rem 0 .4rem;
}

.disk-bar-fill {
    height: 100%;
    border-radius: 999px;
    transition: width .5s ease;
    background: linear-gradient(90deg, var(--green-500), var(--green-600));
}

.disk-bar-fill.warn   { background: linear-gradient(90deg, #fbbf24, var(--color-warn)); }
.disk-bar-fill.danger { background: linear-gradient(90deg, #f87171, var(--color-danger)); }

.disk-meta {
    display: flex;
    justify-content: space-between;
    font-size: .8rem;
    color: var(--color-muted);
}

.disk-folders { margin-top: 1.5rem; }

.disk-folders-title {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--color-muted);
    margin-bottom: .75rem;
}

.disk-folders .folder-row {
    display: flex;
    align-items: center;
    gap: .85rem;
    padding: .55rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: .875rem;
}

.disk-folders .folder-row:last-child { border-bottom: none; }
.disk-folders .folder-row .f-name {
    flex: 1;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: .45rem;
}

.disk-folders .folder-row .f-name i { color: var(--green-600); }
.disk-folders .folder-row .f-size { color: var(--color-muted); white-space: nowrap; font-size: .8rem; }

.disk-mini-bar {
    width: 80px;
    background: var(--color-border);
    border-radius: 999px;
    height: 5px;
    overflow: hidden;
}

.disk-mini-fill {
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--green-500), var(--green-600));
}

/* ================================================================
   FOOTER
================================================================ */
.site-footer {
    text-align: center;
    padding: 1.5rem;
    font-size: .8rem;
    color: var(--color-muted);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

/* ================================================================
   RESPONSIVE
================================================================ */
@media (max-width: 640px) {
    .site-header { padding: 0 1rem; }
    main { margin: 1rem auto; padding: 0 1rem; }
    .folder-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
    .file-meta { display: none; }
    .modal { padding: 1.5rem; margin: 1rem; }
    .disk-stats { grid-template-columns: 1fr; }
}

/* ================================================================
   HEADER ADMIN BUTTONS
================================================================ */
.btn-header {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .38rem .9rem;
    border-radius: var(--radius);
    font-size: .8rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.btn-header:hover {
    transform: translateY(-1px);
    text-decoration: none;
}

.btn-header-green {
    background: var(--green-600);
    color: #fff;
    box-shadow: 0 2px 8px rgba(22,163,74,.3);
}
.btn-header-green:hover {
    background: var(--green-500);
    color: #fff;
    box-shadow: 0 4px 12px rgba(22,163,74,.4);
}

.btn-header-blue {
    background: #2563eb;
    color: #fff;
    box-shadow: 0 2px 8px rgba(37,99,235,.3);
}
.btn-header-blue:hover {
    background: #3b82f6;
    color: #fff;
    box-shadow: 0 4px 12px rgba(37,99,235,.4);
}

.btn-header-slate {
    background: #475569;
    color: #fff;
    box-shadow: 0 2px 8px rgba(71,85,105,.3);
}
.btn-header-slate:hover {
    background: #64748b;
    color: #fff;
    box-shadow: 0 4px 12px rgba(71,85,105,.4);
}

.btn-header-outline {
    background: rgba(255,255,255,.1);
    color: rgba(255,255,255,.85);
    border: 1px solid rgba(255,255,255,.2);
}
.btn-header-outline:hover {
    background: rgba(255,255,255,.2);
    color: #fff;
    border-color: rgba(255,255,255,.35);
}

.btn-header-red {
    background: #dc2626;
    color: #fff;
    box-shadow: 0 2px 8px rgba(220,38,38,.3);
}
.btn-header-red:hover {
    background: #ef4444;
    color: #fff;
    box-shadow: 0 4px 12px rgba(220,38,38,.4);
}