/**
 * Calcolo Stipendio Netto - Stile Principale
 * Design professionale, pulito e unico per il mercato italiano
 */

/* ===== Variabili CSS ===== */
:root {
    /* Colori - Tema Chiaro (Palette Unica Professionale) */
    --color-primary: #2563eb;        /* Blu professionale */
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-secondary: #10b981;      /* Verde successo */
    --color-secondary-dark: #059669;
    --color-secondary-light: #34d399;
    --color-accent: #f59e0b;         /* Arancione accento */
    
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-surface: #f3f4f6;
    --color-border: #e5e7eb;
    
    --color-text-primary: #111827;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --color-info: #3b82f6;
    
    /* Tipografia */
    --font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-base: 1.6;
    --line-height-heading: 1.3;
    
    /* Spaziatura */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    
    /* Layout */
    --container-max-width: 850px;
    --border-radius: 10px;
    --border-radius-lg: 16px;
    --border-radius-sm: 6px;
    
    /* Ombre */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 30px rgba(0, 0, 0, 0.15);
    
    /* Transizioni */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Tema Scuro */
[data-theme="dark"] {
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-secondary: #34d399;
    --color-secondary-dark: #10b981;
    --color-secondary-light: #6ee7b7;
    --color-accent: #fbbf24;
    
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-surface: #1e293b;
    --color-border: #334155;
    
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.menu-open {
    overflow: hidden;
}

/* ===== Tipografia ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-heading);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-primary-dark);
}

strong {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

/* ===== Layout ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

.main-content {
    min-height: calc(100vh - 200px);
}

/* ===== Header ===== */
.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
    transition: all var(--transition-base);
}

[data-theme="dark"] .site-header {
    background-color: rgba(15, 23, 42, 0.95);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.9375rem;
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-surface);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.theme-toggle {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.theme-toggle:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: scale(1.05);
}

.theme-toggle .sun-icon { display: none; }
.theme-toggle .moon-icon { display: block; }
[data-theme="dark"] .theme-toggle .sun-icon { display: block; }
[data-theme="dark"] .theme-toggle .moon-icon { display: none; }

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    top: 73px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: 999;
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-nav-menu {
    list-style: none;
    padding: var(--spacing-lg);
}

.mobile-nav-menu li {
    margin-bottom: var(--spacing-sm);
}

.mobile-nav-link {
    display: block;
    padding: var(--spacing-md);
    color: var(--color-text-primary);
    font-size: 1.0625rem;
    font-weight: var(--font-weight-medium);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

.mobile-nav-link:hover {
    background-color: var(--color-surface);
}

/* ===== Hero Section ===== */
.hero-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    line-height: 1.2;
}

.hero-title .highlight {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-semibold);
    font-size: 1.0625rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* ===== Stats Section ===== */
.stats-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-bg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.stat-number {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

/* ===== Calculator Section ===== */
.calculator-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    max-width: 650px;
    margin: 0 auto;
}

.calculator-container {
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

/* ===== Form Styles ===== */
.calculator-form {
    margin-bottom: var(--spacing-xl);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-label {
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
    font-size: 0.9375rem;
}

.required {
    color: var(--color-danger);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix {
    position: absolute;
    left: var(--spacing-md);
    color: var(--color-text-muted);
    font-weight: var(--font-weight-medium);
    pointer-events: none;
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    transition: all var(--transition-fast);
}

.input-wrapper .form-input {
    padding-left: 2.5rem;
}

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

.form-help {
    margin-top: var(--spacing-xs);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.form-actions {
    margin-top: var(--spacing-xl);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    text-align: center;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: white;
}

.btn-block {
    width: 100%;
}

.btn-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--color-text-secondary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.btn-close:hover {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
}

/* ===== Results Section ===== */
.results-container {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--border-radius-lg);
    color: white;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.results-title {
    font-size: 1.25rem;
    margin-bottom: 0;
    color: white;
}

.results-highlight {
    text-align: center;
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--spacing-lg);
}

.result-label {
    font-size: 0.9375rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-xs);
}

.result-value {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
}

.result-sublabel {
    font-size: 0.875rem;
    opacity: 0.8;
}

.results-breakdown {
    background-color: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.breakdown-title {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.breakdown-table {
    width: 100%;
    border-collapse: collapse;
}

.breakdown-table tr {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.breakdown-table td {
    padding: var(--spacing-sm) 0;
    color: white;
}

.breakdown-label {
    opacity: 0.9;
}

.breakdown-value {
    text-align: right;
    font-weight: var(--font-weight-semibold);
}

.breakdown-highlight {
    background-color: rgba(255, 255, 255, 0.1);
}

.breakdown-highlight td {
    padding: var(--spacing-md) var(--spacing-sm);
    font-weight: var(--font-weight-bold);
}

/* ===== Info Sections ===== */
.info-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.info-content {
    display: grid;
    gap: var(--spacing-xl);
}

.info-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.info-card-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.info-card-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.info-list {
    padding-left: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.info-list li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.tax-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.tax-table th,
.tax-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.tax-table th {
    font-weight: var(--font-weight-semibold);
    background-color: var(--color-bg-alt);
    color: var(--color-text-primary);
}

.tax-table td {
    color: var(--color-text-secondary);
}

/* ===== FAQ Section ===== */
.faq-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.faq-container {
    max-width: 750px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    font-size: 1.0625rem;
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.faq-question:hover {
    background-color: var(--color-surface);
}

.faq-icon {
    flex-shrink: 0;
    transition: transform var(--transition-base);
    color: var(--color-primary);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-question[aria-expanded="true"] + .faq-answer {
    max-height: 800px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== Footer ===== */
.site-footer {
    background-color: var(--color-surface);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-heading {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.footer-text {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-link {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.copyright {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.disclaimer-text {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ===== Responsive Design ===== */

@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
        --spacing-3xl: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .result-value {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .calculator-container {
        padding: var(--spacing-lg);
    }
    
    .results-container {
        padding: var(--spacing-lg);
    }
    
    .result-value {
        font-size: 2rem;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Print Styles ===== */
@media print {
    .site-header,
    .mobile-menu,
    .hero-section,
    .stats-section,
    .calculator-form,
    .site-footer {
        display: none;
    }
    
    .results-container {
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* Social Links and Contact Styles */
.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--color-bg);
    border-radius: 50%;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.footer-contact {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.footer-contact svg {
    color: var(--color-primary);
}

.footer-contact a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.footer-contact a:hover {
    color: var(--color-primary);
}