/* ============================================================
   FattureAI — Toolkit v4 — Single-Page App Styles
   Surpasses fex-app.com with professional UI
   ============================================================ */

/* ================================================================
   TOP BAR (sticky after parse)
   ================================================================ */
.tk-topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    padding: 0;
    transition: transform 0.3s ease;
}
.tk-topbar-inner {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-2) var(--space-6);
    max-width: var(--container-max);
    margin: 0 auto;
    min-height: 48px;
}
.tk-topbar-score {
    position: relative;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}
.tk-score-mini { width: 36px; height: 36px; transform: rotate(-90deg); }
.tk-score-mini-bg { stroke: var(--color-border-light); }
.tk-score-mini-fill { stroke: var(--color-success); transition: stroke-dashoffset 1s ease, stroke 0.5s; stroke-linecap: round; }
.tk-score-mini-val {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    font-size: 11px; font-weight: 700; color: var(--color-text);
    line-height: 1;
}

/* ── Tab Navigation ── */
.tk-tabs {
    display: flex;
    gap: 0;
    flex: 1;
    justify-content: center;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.tk-tabs::-webkit-scrollbar { display: none; }
.tk-tab {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s, border-color 0.2s;
    position: relative;
}
.tk-tab:hover { color: var(--color-primary); }
.tk-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}
.tk-topbar-info {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    flex-shrink: 0;
    max-width: 200px;
    overflow: hidden;
}
.tk-file-name {
    font-weight: 600;
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tk-topbar-actions {
    display: flex;
    gap: var(--space-1);
    flex-shrink: 0;
}

/* ── Buttons ── */
.tk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-sans);
    font-weight: 600;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    text-decoration: none;
    line-height: 1.2;
}
.tk-btn--primary {
    background: var(--color-primary);
    color: #fff;
    padding: 0.625rem 1.25rem;
    font-size: var(--text-sm);
}
.tk-btn--primary:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 2px 8px rgba(13,148,136,0.25);
    transform: translateY(-1px);
}
.tk-btn--outline {
    background: transparent;
    color: var(--color-primary);
    border: 1.5px solid var(--color-primary);
    padding: 0.5rem 1rem;
    font-size: var(--text-sm);
}
.tk-btn--outline:hover {
    background: var(--color-primary-50);
}
.tk-btn--ghost {
    background: transparent;
    color: var(--color-text-secondary);
    padding: 0.375rem 0.625rem;
    font-size: var(--text-xs);
}
.tk-btn--ghost:hover {
    background: var(--color-bg);
    color: var(--color-text);
}
.tk-btn--sm { padding: 0.5rem 1rem; font-size: var(--text-sm); }
.tk-btn--xs { padding: 0.25rem 0.5rem; font-size: var(--text-xs); }
.tk-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.tk-btn--xs svg { width: 14px; height: 14px; }
.tk-btn-label { display: none; }
@media (min-width: 768px) {
    .tk-btn-label { display: inline; }
}

/* ================================================================
   UPLOAD SECTION
   ================================================================ */
.tk-upload-section {
    padding: var(--space-12) 0 var(--space-8);
    background: linear-gradient(165deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    color: var(--color-text-inverse);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.tk-upload-section::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -15%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.tk-upload-hero {
    margin-bottom: var(--space-8);
    position: relative;
    z-index: 1;
}
.tk-upload-title {
    font-size: var(--text-5xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    letter-spacing: var(--tracking-tight);
    margin-bottom: var(--space-3);
}
.tk-upload-title .highlight { color: var(--color-accent-light); }
.tk-upload-subtitle {
    font-size: var(--text-lg);
    color: rgba(255,255,255,0.85);
    max-width: 640px;
    margin: 0 auto;
    line-height: var(--leading-relaxed);
}

.tk-upload-box {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ── Drop Zone ── */
.tk-dropzone {
    border: 2.5px dashed rgba(255,255,255,0.35);
    border-radius: var(--radius-xl);
    padding: var(--space-10) var(--space-8);
    text-align: center;
    cursor: pointer;
    transition: all 0.25s ease;
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(8px);
}
.tk-dropzone:hover {
    border-color: rgba(255,255,255,0.6);
    background: rgba(255,255,255,0.1);
    box-shadow: 0 4px 24px rgba(0,0,0,0.1);
}
.tk-dropzone.dragover {
    border-color: var(--color-accent-light);
    background: rgba(255,255,255,0.15);
    box-shadow: 0 0 0 6px rgba(245,158,11,0.15);
    transform: scale(1.01);
}
.tk-dropzone-icon {
    margin-bottom: var(--space-3);
    color: rgba(255,255,255,0.6);
    transition: color 0.2s, transform 0.2s;
}
.tk-dropzone-icon svg { width: 56px; height: 56px; margin: 0 auto; display: block; }
.tk-dropzone:hover .tk-dropzone-icon,
.tk-dropzone.dragover .tk-dropzone-icon {
    color: var(--color-accent-light);
    transform: translateY(-4px);
}
.tk-dropzone-text {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-inverse);
    margin-bottom: var(--space-1);
}
.tk-dropzone-sub {
    font-size: var(--text-sm);
    color: rgba(255,255,255,0.6);
    margin-bottom: var(--space-3);
}
.tk-dropzone-filebtn {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.4);
    padding: 0.5rem 1.25rem;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
}
.tk-dropzone-filebtn:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,255,255,0.6);
}
.tk-dropzone-hint {
    font-size: var(--text-xs);
    color: rgba(255,255,255,0.5);
    margin-top: var(--space-3);
}
.tk-dropzone-formats {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    margin-top: var(--space-2);
}
.tk-format-tag {
    display: inline-flex;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 600;
    font-family: var(--font-mono);
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255,255,255,0.15);
}

/* ── Paste Area ── */
.tk-paste-area {
    margin-top: var(--space-5);
    text-align: left;
}
.tk-paste-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--space-2);
}
.tk-paste-textarea {
    width: 100%;
    min-height: 100px;
    padding: var(--space-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-inverse);
    background: rgba(0,0,0,0.25);
    border: 1.5px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-md);
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.tk-paste-textarea:focus {
    outline: none;
    border-color: var(--color-accent-light);
    box-shadow: 0 0 0 3px rgba(245,158,11,0.15);
}
.tk-paste-textarea::placeholder { color: rgba(255,255,255,0.3); }
.tk-paste-area .tk-btn { margin-top: var(--space-3); }

/* ================================================================
   LOADING & ERROR
   ================================================================ */
.tk-loading {
    text-align: center;
    padding: var(--space-16) 0;
    color: var(--color-text-secondary);
}
.tk-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    margin: 0 auto var(--space-4);
    animation: tk-spin 0.8s linear infinite;
}
@keyframes tk-spin { to { transform: rotate(360deg); } }

.tk-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    max-width: 700px;
    margin: var(--space-4) auto;
}
.tk-alert--error {
    background: var(--color-error-bg);
    border: 1px solid var(--color-error-border);
    color: var(--color-error-text);
}
.tk-alert--error svg { color: var(--color-error); flex-shrink: 0; margin-top: 1px; }

/* ================================================================
   RESULTS CONTAINER & PANELS
   ================================================================ */
.tk-results {
    padding: var(--space-6) 0 var(--space-12);
    min-height: 60vh;
    background: var(--color-bg);
}
.tk-panel {
    display: none;
    animation: tk-fadeIn 0.25s ease;
}
.tk-panel.active { display: block; }
@keyframes tk-fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================================================================
   TAB 1: FATTURA (Invoice Viewer)
   ================================================================ */
.tk-invoice {
    max-width: 900px;
    margin: 0 auto;
}

/* ── Header Bar ── */
.tk-inv-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-primary-900);
    color: var(--color-text-inverse);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.tk-inv-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}
.tk-inv-tipo-badge {
    display: inline-flex;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.2);
    letter-spacing: 0.02em;
}
.tk-inv-numero {
    font-size: var(--text-xl);
    font-weight: 700;
}
.tk-inv-data {
    font-size: var(--text-sm);
    opacity: 0.8;
}
.tk-inv-header-right {
    text-align: right;
}
.tk-inv-formato {
    font-size: var(--text-xs);
    opacity: 0.6;
    font-family: var(--font-mono);
}

/* ── Party Cards ── */
.tk-inv-parties {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
}
@media (max-width: 639px) {
    .tk-inv-parties { grid-template-columns: 1fr; }
}
.tk-inv-party {
    padding: var(--space-5);
    position: relative;
}
.tk-inv-party--cedente {
    border-right: 1px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
}
.tk-inv-party--cessionario {
    border-top: 3px solid var(--color-accent);
}
@media (max-width: 639px) {
    .tk-inv-party--cedente { border-right: none; border-bottom: 1px solid var(--color-border); }
}
.tk-inv-party-label {
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}
.tk-inv-party-name {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-1);
}
.tk-inv-party-detail {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}
.tk-inv-party-detail strong {
    color: var(--color-text);
    font-weight: 600;
}

/* ── Section Blocks ── */
.tk-inv-section {
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.tk-inv-section:last-child {
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}
.tk-inv-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-5);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}
.tk-inv-section-header:hover { background: var(--color-border-light); }
.tk-inv-section-title {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.tk-inv-section-toggle {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    transition: transform 0.2s;
}
.tk-inv-section.collapsed .tk-inv-section-toggle { transform: rotate(-90deg); }
.tk-inv-section.collapsed .tk-inv-section-body { display: none; }
.tk-inv-section-body {
    padding: var(--space-4) var(--space-5);
}

/* ── Data Grid ── */
.tk-data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-3) var(--space-5);
}
.tk-data-item {}
.tk-data-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-muted);
    margin-bottom: 2px;
}
.tk-data-value {
    font-size: var(--text-sm);
    color: var(--color-text);
    font-weight: 500;
}
.tk-data-value--code {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    display: inline-block;
}
.tk-data-value--desc {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    margin-top: 1px;
}

/* ── Line Items Table ── */
.tk-lines-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.tk-lines-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}
.tk-lines-table th {
    text-align: left;
    padding: var(--space-2) var(--space-3);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-muted);
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-border);
    white-space: nowrap;
}
.tk-lines-table th.num { text-align: center; width: 40px; }
.tk-lines-table th.amt { text-align: right; }
.tk-lines-table td {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: top;
    color: var(--color-text);
}
.tk-lines-table td.num { text-align: center; color: var(--color-text-muted); font-family: var(--font-mono); font-size: var(--text-xs); }
.tk-lines-table td.amt { text-align: right; font-family: var(--font-mono); white-space: nowrap; }
.tk-lines-table td.desc { max-width: 300px; }
.tk-lines-table tr:hover td { background: var(--color-primary-50); }
.tk-line-code {
    display: inline-block;
    font-size: 10px;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: 1px 5px;
    border-radius: var(--radius-sm);
    margin-top: 2px;
}
.tk-line-natura {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
    border: 1px solid var(--color-warning-border);
}

/* ── Riepilogo IVA ── */
.tk-riepilogo-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}
.tk-riepilogo-table th {
    text-align: left;
    padding: var(--space-2) var(--space-3);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-muted);
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-border);
}
.tk-riepilogo-table th.amt { text-align: right; }
.tk-riepilogo-table td {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border-light);
}
.tk-riepilogo-table td.amt { text-align: right; font-family: var(--font-mono); }
.tk-riepilogo-table tfoot td {
    font-weight: 700;
    border-top: 2px solid var(--color-primary);
    padding-top: var(--space-3);
}

/* ── Totale ── */
.tk-inv-total {
    display: flex;
    align-items: baseline;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-primary-50);
    border-top: 2px solid var(--color-primary);
}
.tk-inv-total-label {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-secondary);
}
.tk-inv-total-amount {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary-dark);
    font-family: var(--font-mono);
}
.tk-inv-total-currency {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ── Causale ── */
.tk-inv-causale {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    padding: var(--space-3) 0;
    font-style: italic;
    border-top: 1px dashed var(--color-border);
    margin-top: var(--space-3);
}

/* ================================================================
   TAB 2: VERIFICA (Validation)
   ================================================================ */
.tk-verifica {
    max-width: 900px;
    margin: 0 auto;
}
.tk-verifica-header {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    padding: var(--space-6);
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-6);
}
@media (max-width: 639px) {
    .tk-verifica-header { flex-direction: column; text-align: center; gap: var(--space-4); }
}

/* ── Score Ring ── */
.tk-score-ring-wrap {
    position: relative;
    width: 120px;
    height: 120px;
    flex-shrink: 0;
}
.tk-score-ring {
    width: 120px;
    height: 120px;
    transform: rotate(-90deg);
}
.tk-score-ring-bg { stroke: var(--color-border-light); }
.tk-score-ring-fill {
    stroke: var(--color-success);
    transition: stroke-dashoffset 1.2s cubic-bezier(0.4,0,0.2,1), stroke 0.5s;
    stroke-linecap: round;
}
.tk-score-ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}
.tk-score-ring-val {
    display: block;
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}
.tk-score-ring-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* Score colors */
.tk-score--green .tk-score-ring-fill,
.tk-score--green .tk-score-mini-fill { stroke: var(--color-success); }
.tk-score--amber .tk-score-ring-fill,
.tk-score--amber .tk-score-mini-fill { stroke: var(--color-warning); }
.tk-score--red .tk-score-ring-fill,
.tk-score--red .tk-score-mini-fill { stroke: var(--color-error); }

.tk-verifica-summary { flex: 1; }
.tk-verifica-summary h2 {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
}
.tk-verifica-summary p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-3);
}

/* ── Count Badges ── */
.tk-verifica-counts {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}
.tk-count-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 4px 10px;
    font-size: var(--text-xs);
    font-weight: 700;
    border-radius: var(--radius-full);
    line-height: 1.2;
}
.tk-count-badge--error {
    background: var(--color-error-bg);
    color: var(--color-error-text);
    border: 1px solid var(--color-error-border);
}
.tk-count-badge--warning {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
    border: 1px solid var(--color-warning-border);
}
.tk-count-badge--quality {
    background: var(--color-info-bg);
    color: var(--color-info-text);
    border: 1px solid var(--color-info-border);
}
.tk-count-badge--info {
    background: var(--color-bg);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

/* ── Validation Groups ── */
.tk-vgroup {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    overflow: hidden;
}
.tk-vgroup-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-bg);
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--color-border);
    transition: background 0.15s;
}
.tk-vgroup-header:hover { background: var(--color-border-light); }
.tk-vgroup-icon { width: 24px; height: 24px; flex-shrink: 0; }
.tk-vgroup-icon--error { color: var(--color-error); }
.tk-vgroup-icon--warning { color: var(--color-warning); }
.tk-vgroup-icon--quality { color: var(--color-info); }
.tk-vgroup-icon--info { color: var(--color-text-muted); }
.tk-vgroup-title {
    flex: 1;
    font-size: var(--text-sm);
    font-weight: 700;
}
.tk-vgroup-count {
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: var(--color-bg);
    color: var(--color-text-secondary);
}
.tk-vgroup-body { padding: 0; }
.tk-vgroup.collapsed .tk-vgroup-body { display: none; }

/* ── Validation Item ── */
.tk-vitem {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    border-bottom: 1px solid var(--color-border-light);
    transition: background 0.15s;
}
.tk-vitem:last-child { border-bottom: none; }
.tk-vitem:hover { background: var(--color-bg); }
.tk-vitem-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}
.tk-vitem-icon--error { color: var(--color-error); }
.tk-vitem-icon--warning { color: var(--color-warning); }
.tk-vitem-icon--quality { color: var(--color-info); }
.tk-vitem-icon--info { color: var(--color-text-muted); }
.tk-vitem-content { flex: 1; min-width: 0; }
.tk-vitem-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}
.tk-vitem-desc {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}
.tk-vitem-xpath {
    font-size: 10px;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: 1px 5px;
    border-radius: var(--radius-sm);
    display: inline-block;
    margin-top: 4px;
}
.tk-vitem-suggestion {
    font-size: var(--text-xs);
    color: var(--color-primary-dark);
    margin-top: 4px;
    padding: var(--space-2) var(--space-3);
    background: var(--color-primary-50);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-primary);
}

.tk-verifica-cta {
    text-align: center;
    margin-top: var(--space-6);
}

/* ================================================================
   TAB 3: XML (Source View)
   ================================================================ */
.tk-xml { max-width: 960px; margin: 0 auto; }
.tk-xml-toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    flex-wrap: wrap;
}
.tk-xml-search {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
}
.tk-xml-search-field {
    padding: 4px 8px;
    font-size: var(--text-xs);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text);
    width: 160px;
    font-family: var(--font-mono);
}
.tk-xml-search-field:focus {
    outline: none;
    border-color: var(--color-primary);
}
#tk-xml-search-count {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* ── XML Viewer (dark theme) ── */
.tk-xml-viewer {
    background: #1a1b26;
    color: #c0caf5;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    padding: var(--space-4);
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    overflow-x: auto;
    max-height: 70vh;
    overflow-y: auto;
    counter-reset: xmlline;
    tab-size: 2;
}
.tk-xml-viewer .xml-line {
    display: block;
    padding: 0 0 0 3.5em;
    position: relative;
    min-height: 1.6em;
    white-space: pre-wrap;
    word-break: break-all;
}
.tk-xml-viewer .xml-line::before {
    counter-increment: xmlline;
    content: counter(xmlline);
    position: absolute;
    left: 0;
    width: 3em;
    text-align: right;
    color: #565f89;
    font-size: 12px;
    user-select: none;
    padding-right: 0.5em;
}
.tk-xml-viewer .xml-line:hover { background: rgba(255,255,255,0.03); }
.tk-xml-viewer .xml-line.highlight { background: rgba(245,158,11,0.1); }

/* Syntax colors */
.xml-tag { color: #7aa2f7; }
.xml-attr { color: #e0af68; }
.xml-val { color: #9ece6a; }
.xml-text { color: #c0caf5; }
.xml-comment { color: #565f89; font-style: italic; }
.xml-decl { color: #bb9af7; }
.xml-entity { color: #ff9e64; }
.xml-search-match { background: rgba(245,158,11,0.3); border-radius: 2px; padding: 0 2px; }

/* ================================================================
   TAB 4: PDF Preview
   ================================================================ */
.tk-pdf { max-width: 900px; margin: 0 auto; }
.tk-pdf-toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}
.tk-pdf-preview {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-10) var(--space-8);
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    min-height: 500px;
    font-size: var(--text-sm);
    color: var(--color-text);
    line-height: var(--leading-normal);
}

/* PDF inner styles */
.tk-pdf-preview .pdf-header {
    text-align: center;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 2px solid var(--color-primary);
}
.tk-pdf-preview .pdf-tipo {
    display: inline-block;
    padding: 4px 16px;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    margin-bottom: var(--space-2);
}
.tk-pdf-preview .pdf-numero {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text);
}
.tk-pdf-preview .pdf-data {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}
.tk-pdf-preview .pdf-parties {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}
@media (max-width: 639px) {
    .tk-pdf-preview .pdf-parties { grid-template-columns: 1fr; }
}
.tk-pdf-preview .pdf-party h3 {
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-1);
    border-bottom: 2px solid var(--color-border);
}
.tk-pdf-preview .pdf-party-name {
    font-size: var(--text-base);
    font-weight: 700;
    margin-bottom: var(--space-1);
}
.tk-pdf-preview .pdf-party-info {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}
.tk-pdf-preview table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-6);
}
.tk-pdf-preview table th {
    text-align: left;
    padding: var(--space-2) var(--space-3);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-border);
}
.tk-pdf-preview table th.r { text-align: right; }
.tk-pdf-preview table td {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-border-light);
}
.tk-pdf-preview table td.r { text-align: right; font-family: var(--font-mono); }
.tk-pdf-preview .pdf-total-row td {
    font-weight: 700;
    font-size: var(--text-base);
    border-top: 2px solid var(--color-primary);
    padding-top: var(--space-3);
}
.tk-pdf-preview .pdf-footer {
    text-align: center;
    margin-top: var(--space-8);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-light);
    font-size: 10px;
    color: var(--color-text-muted);
}

/* ================================================================
   TAB 5: ALLEGATI
   ================================================================ */
.tk-allegati { max-width: 900px; margin: 0 auto; }
.tk-allegati-empty {
    text-align: center;
    padding: var(--space-12);
    color: var(--color-text-muted);
}
.tk-allegati-empty svg {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-3);
    opacity: 0.4;
}
.tk-allegati-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}
.tk-allegato-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.tk-allegato-card:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-md);
}
.tk-allegato-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--color-info-bg);
    color: var(--color-info);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.tk-allegato-icon svg { width: 22px; height: 22px; }
.tk-allegato-info { flex: 1; min-width: 0; }
.tk-allegato-name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tk-allegato-meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}
.tk-allegato-desc {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    margin-top: 2px;
}
.tk-allegato-actions {
    display: flex;
    gap: var(--space-2);
    flex-shrink: 0;
}

/* ================================================================
   EXISTING SECTIONS (hub.php reuses these — keep)
   ================================================================ */

/* ---------- Toolkit Hero ---------- */
.toolkit-hero {
    background: linear-gradient(165deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    color: var(--color-text-inverse);
    padding: var(--space-16) var(--space-6) var(--space-12);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.toolkit-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -15%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.toolkit-hero::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(245,158,11,0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.toolkit-hero--compact {
    padding: var(--space-10) var(--space-6) var(--space-8);
}
.toolkit-hero h1 {
    font-size: var(--text-5xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    margin-bottom: var(--space-4);
    letter-spacing: var(--tracking-tight);
    position: relative;
    z-index: 1;
}
.toolkit-hero h1 .highlight {
    color: var(--color-accent-light);
}
.toolkit-hero .hero-subtitle {
    font-size: var(--text-lg);
    color: rgba(255,255,255,0.85);
    max-width: 680px;
    margin: 0 auto;
    line-height: var(--leading-relaxed);
    position: relative;
    z-index: 1;
}
.toolkit-hero .hero-badges {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    margin-top: var(--space-6);
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.toolkit-hero .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.9);
    backdrop-filter: blur(8px);
}
.toolkit-hero .hero-badge svg {
    width: 14px;
    height: 14px;
    color: var(--color-accent-light);
}

/* ---------- Stats Strip ---------- */
.toolkit-stats {
    background: var(--color-primary-900);
    color: var(--color-text-inverse);
    padding: var(--space-6) var(--space-6);
}
.toolkit-stats .stats-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-8);
    max-width: var(--container-max);
    margin: 0 auto;
}
.toolkit-stats .stat-item {
    text-align: center;
    min-width: 120px;
}
.toolkit-stats .stat-value {
    display: block;
    font-size: var(--text-2xl);
    font-weight: 700;
    letter-spacing: var(--tracking-tight);
    line-height: 1.2;
    color: var(--color-accent-light);
}
.toolkit-stats .stat-label {
    display: block;
    font-size: var(--text-xs);
    opacity: 0.7;
    font-weight: 500;
    margin-top: var(--space-1);
}
@media (min-width: 640px) {
    .toolkit-stats { padding: var(--space-8) var(--space-6); }
    .toolkit-stats .stats-grid { gap: var(--space-16); }
}

/* ---------- Tool Cards Grid ---------- */
.toolkit-cards {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}
.toolkit-cards .section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-10);
}
.toolkit-cards .section-header h2 {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-3);
}
.toolkit-cards .section-header p {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}
.tools-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    max-width: var(--container-max);
    margin: 0 auto;
}
@media (min-width: 640px) { .tools-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .tools-grid { grid-template-columns: repeat(3, 1fr); } }

.tool-card {
    display: flex;
    flex-direction: column;
    padding: var(--space-8);
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}
.tool-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    opacity: 0;
    transition: opacity var(--transition-base);
}
.tool-card:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}
.tool-card:hover::before { opacity: 1; }
.tool-card--new { border-color: var(--color-primary-200); }
.tool-card--pro {
    border-color: var(--color-accent-light);
    background: linear-gradient(180deg, var(--color-accent-50) 0%, var(--color-surface) 40%);
}
.tool-card--pro::before { background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light)); }
.tool-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    transition: transform var(--transition-base);
}
.tool-card:hover .tool-card-icon { transform: scale(1.08); }
.tool-card-icon svg { width: 28px; height: 28px; }
.tool-card-icon--viewer { background: var(--color-primary-50); color: var(--color-primary); }
.tool-card-icon--validator { background: var(--color-success-bg); color: var(--color-success); }
.tool-card-icon--pdf { background: var(--color-error-bg); color: var(--color-error); }
.tool-card-icon--analyzer { background: var(--color-info-bg); color: var(--color-info); }
.tool-card-icon--compare { background: var(--color-warning-bg); color: var(--color-warning); }
.tool-card-icon--api { background: var(--color-accent-50); color: var(--color-accent-dark); }
.tool-card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
    letter-spacing: var(--tracking-tight);
}
.tool-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    flex: 1;
    margin-bottom: var(--space-4);
}
.tool-card-badges {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}
.tool-card-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    line-height: 1.4;
}
.tool-card-badge--free {
    background: var(--color-success-bg);
    color: var(--color-success-text);
    border: 1px solid var(--color-success-border);
}
.tool-card-badge--new {
    background: var(--color-info-bg);
    color: var(--color-info-text);
    border: 1px solid var(--color-info-border);
}
.tool-card-badge--pro {
    background: var(--color-accent-50);
    color: var(--color-accent-dark);
    border: 1px solid var(--color-accent-light);
}
.tool-card-cta {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}
.tool-card:hover .tool-card-cta { color: var(--color-primary-dark); }

/* ---------- Why Section ---------- */
.toolkit-why {
    padding: var(--space-16) 0;
    background: var(--color-surface);
}
.toolkit-why h2 {
    text-align: center;
    font-size: var(--text-4xl);
    font-weight: 700;
    margin-bottom: var(--space-10);
    letter-spacing: var(--tracking-tight);
}
.why-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}
@media (min-width: 640px) { .why-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .why-grid { grid-template-columns: repeat(4, 1fr); } }
.why-item {
    text-align: center;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.why-item:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-md);
}
.why-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto var(--space-4);
    background: var(--color-primary-50);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}
.why-icon svg { width: 24px; height: 24px; display: block; }
.why-item h3 {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-2);
}
.why-item p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

/* ---------- FAQ Section ---------- */
.toolkit-faq {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}
.toolkit-faq h2 {
    text-align: center;
    font-size: var(--text-3xl);
    font-weight: 700;
    margin-bottom: var(--space-8);
}

/* ---------- CTA Section ---------- */
.toolkit-cta {
    padding: var(--space-12) 0;
    background: var(--color-bg);
}
.cta-box {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    color: var(--color-text-inverse);
    border-radius: var(--radius-2xl);
    padding: var(--space-12) var(--space-8);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-box::before {
    content: '';
    position: absolute;
    top: -50%; right: -20%;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.cta-box h2 {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    margin-bottom: var(--space-3);
    position: relative;
    z-index: 1;
}
.cta-box p {
    font-size: var(--text-lg);
    color: var(--color-text-inverse);
    opacity: 0.85;
    max-width: 550px;
    margin: 0 auto var(--space-6);
    line-height: var(--leading-relaxed);
    position: relative;
    z-index: 1;
}
.cta-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.cta-box .btn-primary,
.cta-box .btn-lg {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.875rem 1.75rem;
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
}
.cta-box .btn-primary {
    background: var(--color-accent);
    color: #fff;
    border: none;
}
.cta-box .btn-primary:hover {
    background: var(--color-accent-dark);
    box-shadow: var(--shadow-accent);
    transform: translateY(-2px);
}
.cta-box .btn-outline {
    background: rgba(255,255,255,0.12);
    color: var(--color-text-inverse);
    border: 1.5px solid rgba(255,255,255,0.3);
    padding: 0.875rem 1.75rem;
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all var(--transition-base);
}
.cta-box .btn-outline:hover {
    background: rgba(255,255,255,0.22);
    border-color: rgba(255,255,255,0.5);
}

/* ================================================================
   PRINT STYLES
   ================================================================ */
@media print {
    .tk-topbar, .tk-upload-section, .tk-xml-toolbar, .tk-pdf-toolbar,
    .tk-verifica-cta, .toolkit-cta, .toolkit-faq, .tk-allegato-actions,
    .tk-btn, .tk-tabs, .tk-topbar-actions, .tk-dropzone, .tk-paste-area { display: none !important; }
    .tk-results { padding: 0; }
    .tk-panel { display: block !important; page-break-inside: avoid; }
    .tk-panel:not(#tk-panel-fattura):not(#tk-panel-verifica) { display: none !important; }
    .tk-invoice { max-width: 100%; }
    .tk-inv-header { background: #333 !important; color: #fff !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
    .tk-lines-table th { background: #f5f5f5 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 767px) {
    .tk-topbar-inner { gap: var(--space-2); padding: var(--space-2) var(--space-3); }
    .tk-topbar-info { display: none; }
    .tk-tab { padding: var(--space-2) var(--space-3); font-size: var(--text-xs); }
    .tk-upload-title { font-size: var(--text-3xl); }
    .tk-inv-header { flex-direction: column; text-align: center; }
    .tk-inv-header-right { text-align: center; }
    .tk-inv-total { flex-direction: column; align-items: flex-end; gap: var(--space-1); }
    .tk-verifica-header { padding: var(--space-4); gap: var(--space-4); }
    .tk-score-ring-wrap { width: 90px; height: 90px; }
    .tk-score-ring { width: 90px; height: 90px; }
    .tk-vitem { padding: var(--space-3); }
}