:root {
    --bg: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-tertiary: #242833;
    --bg-hover: #2d3140;
    --text: #e4e6ed;
    --text-secondary: #9ca0ad;
    --text-muted: #6b7080;
    --border: #2d3140;
    --accent: #5b8af5;
    --accent-hover: #7ba3f7;
    --accent-bg: rgba(91, 138, 245, 0.1);
    --green: #3dd68c;
    --green-bg: rgba(61, 214, 140, 0.1);
    --red: #f5555d;
    --red-bg: rgba(245, 85, 93, 0.1);
    --orange: #f5a623;
    --orange-bg: rgba(245, 166, 35, 0.1);
    --yellow: #f5d76e;
    --yellow-bg: rgba(245, 215, 110, 0.1);
    --blue: #5b8af5;
    --blue-bg: rgba(91, 138, 245, 0.1);
    --purple: #7c3aed;
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 12px;

    /* Scala shadow — 3 livelli */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.25);
    --shadow:    0 4px 12px rgba(0,0,0,0.4),  0 2px 4px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5),  0 4px 8px rgba(0,0,0,0.35);

    /* Scala tipografica */
    --fs-xs:   0.68rem;   /* label, badge, caption */
    --fs-sm:   0.78rem;   /* testo secondario, tag */
    --fs-base: 0.875rem;  /* testo normale, input */
    --fs-md:   0.95rem;   /* sottotitoli, card header */
    --fs-lg:   1.1rem;    /* titoli sezione */
    --fs-xl:   1.3rem;    /* titoli pannello */
    --fs-2xl:  1.6rem;    /* hero / score grande */

    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --transition: 0.15s ease;
}

[data-theme="light"] {
    --bg: #f5f6fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef0f5;
    --bg-hover: #e4e6ed;
    --text: #1a1d27;
    --text-secondary: #5a5f70;
    --text-muted: #8a8f9f;
    --border: #d5d8e0;
    --accent: #4070e8;
    --accent-hover: #2d5bd0;
    --accent-bg: rgba(64, 112, 232, 0.08);
    --green-bg: rgba(34, 197, 94, 0.08);
    --red-bg: rgba(239, 68, 68, 0.08);
    --orange-bg: rgba(245, 158, 11, 0.08);
    --yellow-bg: rgba(234, 179, 8, 0.08);
    --blue-bg: rgba(59, 130, 246, 0.08);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow:    0 4px 12px rgba(0,0,0,0.1),  0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.14), 0 4px 8px rgba(0,0,0,0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--fs-base);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* ── Transizione pagina ────────────────────── */
@keyframes nf-page-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.page.active {
    animation: nf-page-in 0.18s ease-out;
}

/* header styles moved to sidebar.css (.app-header) */

.btn-icon {
    background: none;
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 1.2rem;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition);
}
.btn-icon:hover { background: var(--bg-hover); }

/* .tabs/.tab replaced by sidebar — see sidebar.css */
/* .panel styles in sidebar.css */

.btn {
    padding: 8px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--fs-base);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition), opacity var(--transition), transform 0.1s ease, box-shadow var(--transition);
    user-select: none;
}
.btn:active:not(:disabled) {
    transform: scale(0.97);
}
.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

.home-hero-btn { opacity: 1; transition: opacity 0.2s; }
.home-hero-btn:hover { opacity: 0.85; }

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 8px rgba(91,138,245,0.25);
}
.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: 0 4px 14px rgba(91,138,245,0.35);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { background: var(--bg-hover); }

.btn-sm { padding: 5px 12px; font-size: var(--fs-sm); }

.btn-danger {
    background: var(--red);
    color: #fff;
}
.btn-danger:hover:not(:disabled) { opacity: 0.85; }

/* Forms */
.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-group {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 140px;
}

.form-group-wide { flex: 2; min-width: 280px; }

.form-group label {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.negate-label {
    flex-direction: row !important;
    align-items: center;
    gap: 4px;
    font-size: var(--fs-xs) !important;
    color: var(--orange) !important;
    margin-top: 4px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--fs-base);
    color: var(--text-secondary);
    cursor: pointer;
}

input[type="text"],
input[type="number"],
select,
textarea {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--fs-base);
    transition: border-color var(--transition), box-shadow var(--transition);
}

/* Focus ring WCAG-compliant — visibile anche con tastiera */
input:focus-visible, select:focus-visible, textarea:focus-visible,
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(91,138,245,0.2);
}

input:disabled, select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

textarea {
    font-family: var(--font-mono);
    resize: vertical;
}

/* ── Modal ──────────────────────────────────── */
@keyframes nf-modal-bg-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes nf-modal-content-in {
    from { opacity: 0; transform: translateY(-10px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: nf-modal-bg-in 0.15s ease-out;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 900px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    animation: nf-modal-content-in 0.18s ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 { font-size: var(--fs-lg); }

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 4px;
    transition: color var(--transition);
    line-height: 1;
}
.modal-close:hover { color: var(--text); }

.modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    padding: 0 20px;
}

.modal-tab {
    padding: 10px 20px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: var(--fs-base);
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition);
}
.modal-tab:hover { color: var(--text); }
.modal-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.export-output {
    flex: 1;
    overflow: auto;
    padding: 16px 20px;
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    line-height: 1.5;
    background: var(--bg);
    margin: 12px 20px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    white-space: pre;
    max-height: 50vh;
}

.modal-actions {
    display: flex;
    gap: 8px;
    padding: 12px 20px;
    border-top: 1px solid var(--border);
}

/* Footer */
footer {
    text-align: center;
    padding: 16px;
    color: var(--text-muted);
    font-size: var(--fs-sm);
    border-top: 1px solid var(--border);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Responsive */
@media (max-width: 768px) {
    .panel { padding: 16px; }
    .form-row { flex-direction: column; }
    .form-group { min-width: 100%; }
}