/* ============================================================
   RatioChart - Stili Globali
   ============================================================ */

/* --- CSS Variables (Design System) --- */
:root {
    /* Colori primari */
    --primary: #6C5CE7;
    --primary-light: #a29bfe;
    --primary-dark: #5a4bd1;
    --primary-bg: rgba(108, 92, 231, 0.08);
    
    /* Colori accent */
    --accent: #00b894;
    --accent-light: #55efc4;
    --danger: #d63031;
    --danger-light: #ff7675;
    --warning: #fdcb6e;
    --info: #74b9ff;
    
    /* Grigi */
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f5;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #868e96;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Sfondo e testo */
    --bg: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --text: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border: #e9ecef;
    --border-hover: #dee2e6;
    
    /* Ombre */
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.08), 0 10px 10px rgba(0,0,0,0.04);
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Transizioni */
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Font */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --toolbar-width: 56px;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
    --primary: #a29bfe;
    --primary-light: #6C5CE7;
    --primary-dark: #c8c3ff;
    --primary-bg: rgba(162, 155, 254, 0.1);
    
    --bg: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text: #e4e6eb;
    --text-secondary: #b0b3b8;
    --text-muted: #6c757d;
    --border: #2d2d44;
    --border-hover: #3d3d5c;
    
    --gray-50: #1e1e33;
    --gray-100: #25253d;
    --gray-200: #2d2d44;
    --gray-300: #3d3d5c;
    --gray-400: #4d4d6b;
    --gray-500: #6c6c8a;
    --gray-600: #9090a7;
    --gray-700: #b0b0c4;
    --gray-800: #d0d0de;
    --gray-900: #e4e6eb;
    
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3), 0 2px 4px rgba(0,0,0,0.2);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.3), 0 4px 6px rgba(0,0,0,0.2);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.3), 0 10px 10px rgba(0,0,0,0.2);
}

/* --- Reset --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    min-height: 100vh;
}

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

img {
    max-width: 100%;
    display: block;
}

/* --- Utility Classes --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    line-height: 1.4;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(108, 92, 231, 0.3);
}
.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.4);
    transform: translateY(-1px);
}

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

.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover:not(:disabled) {
    background: #c0392b;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 12px;
}
.btn-ghost:hover:not(:disabled) {
    background: var(--bg-secondary);
    color: var(--text);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-sm);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

/* --- Form Elements --- */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 0.9375rem;
    color: var(--text);
    background: var(--bg);
    transition: all var(--transition);
    outline: none;
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-bg);
}

.form-input.error {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(214, 48, 49, 0.1);
}

.form-error {
    font-size: 0.8125rem;
    color: var(--danger);
    margin-top: 4px;
}

.form-hint {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* --- Avatar --- */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: #fff;
    flex-shrink: 0;
}

.avatar-sm {
    width: 32px;
    height: 32px;
    font-size: 0.75rem;
}

.avatar-lg {
    width: 48px;
    height: 48px;
    font-size: 1rem;
}

/* --- Toast Notifications --- */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease-out;
    max-width: 380px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast.toast-success { background: var(--accent); }
.toast.toast-error { background: var(--danger); }
.toast.toast-info { background: var(--primary); }
.toast.toast-warning { background: #e17055; }

.toast.toast-out {
    animation: toastOut 0.3s ease-in forwards;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100px); }
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 9000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
    padding: 20px;
}

.modal {
    background: var(--bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 480px;
    width: 100%;
    animation: modalIn 0.3s ease;
    overflow: hidden;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* --- Dropdown --- */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    padding: 4px;
    z-index: 5000;
    animation: dropdownIn 0.15s ease;
    display: none;
}

.dropdown-menu.active {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 14px;
    font-size: 0.875rem;
    color: var(--text);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    border: none;
    background: none;
    width: 100%;
    font-family: var(--font);
    text-align: left;
}
.dropdown-item:hover {
    background: var(--bg-secondary);
}
.dropdown-item.danger {
    color: var(--danger);
}
.dropdown-item.danger:hover {
    background: rgba(214, 48, 49, 0.08);
}

.dropdown-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Spinner --- */
.spinner {
    width: 20px;
    height: 20px;
    border: 2.5px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

.spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--gray-400);
}

/* --- Badge --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-primary {
    background: var(--primary-bg);
    color: var(--primary);
}
.badge-success {
    background: rgba(0, 184, 148, 0.1);
    color: var(--accent);
}
.badge-warning {
    background: rgba(253, 203, 110, 0.2);
    color: #e17055;
}

/* --- Tooltip --- */
[data-tooltip] {
    position: relative;
}
[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 5px 10px;
    background: var(--gray-900);
    color: #fff;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition);
    margin-bottom: 6px;
    z-index: 8000;
}
[data-tooltip]:hover::after {
    opacity: 1;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}
.empty-state svg {
    width: 80px;
    height: 80px;
    color: var(--text-muted);
    margin: 0 auto 16px;
}
.empty-state h3 {
    font-size: 1.125rem;
    color: var(--text);
    margin-bottom: 8px;
}
.empty-state p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 20px;
}