/* =============================================
   TUOUfficio.com - Design System Moderno 2025
   Il Miglior Tool per Ufficio del Web Italiano
   ============================================= */

/* CSS Variables - Design Tokens */
:root {
    /* Colori Primari - Tema Moderno */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #7c3aed;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Colori UI */
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    --surface-color: #ffffff;
    --surface-elevated: #ffffff;
    
    /* Testo */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Bordi e Ombre */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px -10px var(--primary-color);
    
    /* Spaziature */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Dimensioni */
    --header-height: 70px;
    --mobile-nav-height: 70px;
    --sidebar-width: 280px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transizioni */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Font */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --surface-color: #1e293b;
    --surface-elevated: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-light: #334155;
    --border-medium: #475569;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
}

/* =============================================
   BASE STYLES
   ============================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Selection */
::selection {
    background: var(--primary-color);
    color: var(--text-inverse);
}

/* =============================================
   TYPOGRAPHY
   ============================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-muted-custom {
    color: var(--text-muted);
}

/* =============================================
   LAYOUT COMPONENTS
   ============================================= */

/* Main Container */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-lg);
}

@media (max-width: 768px) {
    .main-container {
        padding: var(--space-md);
        padding-bottom: calc(var(--mobile-nav-height) + var(--space-lg));
    }
}

/* Glass Effect */
.glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

body.dark-mode .glass {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* =============================================
   HEADER & NAVIGATION
   ============================================= */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.main-header.scrolled {
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
}

body.dark-mode .main-header.scrolled {
    background: rgba(15, 23, 42, 0.95);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
}

.brand-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Desktop Navigation */
.desktop-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.nav-link i {
    font-size: 1rem;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.header-clock {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-icon {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    padding: 0 var(--space-md);
}

.mobile-header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

@media (max-width: 991px) {
    .main-header {
        display: none;
    }
    .mobile-header {
        display: block;
    }
    body {
        padding-top: 60px;
    }
}

/* Mobile Bottom Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mobile-nav-height);
    background: var(--surface-color);
    border-top: 1px solid var(--border-light);
    z-index: 1000;
    padding: var(--space-sm) 0;
}

.mobile-nav-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    min-width: 60px;
}

.mobile-nav-item i {
    font-size: 1.25rem;
}

.mobile-nav-item.active,
.mobile-nav-item:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.mobile-nav-item.active {
    background: var(--primary-gradient);
    color: white;
}

@media (max-width: 991px) {
    .mobile-nav {
        display: block;
    }
}

/* =============================================
   CARDS
   ============================================= */
.card-modern {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-header-modern {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body-modern {
    padding: var(--space-lg);
}

.card-footer-modern {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.card-icon-modern {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
}

.card-icon-modern.success { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.card-icon-modern.warning { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.card-icon-modern.danger { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); }
.card-icon-modern.info { background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%); }
.card-icon-modern.dark { background: linear-gradient(135deg, #475569 0%, #334155 100%); }

/* Tool Card */
.tool-card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    padding: var(--space-lg);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    height: 100%;
}

.tool-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
    text-decoration: none;
    color: var(--text-primary);
}

.tool-card-icon {
    width: 64px;
    height: 64px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--primary-color);
    transition: all var(--transition-normal);
}

.tool-card:hover .tool-card-icon {
    background: var(--primary-gradient);
    color: white;
    transform: scale(1.1);
}

.tool-card-title {
    font-weight: 600;
    font-size: 1rem;
}

.tool-card-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary-custom {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(102, 126, 234, 0.39);
}

.btn-primary-custom:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(102, 126, 234, 0.5);
    color: white;
}

.btn-secondary-custom {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.btn-secondary-custom:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-success-custom {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.39);
}

.btn-danger-custom {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
}

/* =============================================
   FORM ELEMENTS
   ============================================= */
.form-control-modern {
    width: 100%;
    padding: var(--space-md);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    background: var(--surface-color);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-control-modern:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.form-label-modern {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.form-group {
    margin-bottom: var(--space-md);
}

/* =============================================
   WIDGETS
   ============================================= */

/* Clock Widget */
.widget-clock {
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    color: white;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.widget-clock-time {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -2px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.widget-clock-date {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: var(--space-sm);
}

/* Pomodoro Widget */
.widget-pomodoro {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    border: 1px solid var(--border-light);
}

.pomodoro-timer {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: var(--space-lg) 0;
}

.pomodoro-timer.active {
    color: var(--primary-color);
}

.pomodoro-timer.break {
    color: var(--success-color);
}

.pomodoro-controls {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
}

/* Todo Widget */
.todo-container {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.todo-list {
    list-style: none;
    max-height: 300px;
    overflow-y: auto;
}

.todo-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-fast);
}

.todo-item:hover {
    background: var(--bg-secondary);
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: var(--text-muted);
}

.todo-checkbox {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-medium);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.todo-checkbox:hover {
    border-color: var(--primary-color);
}

.todo-checkbox.checked {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.todo-text {
    flex: 1;
    font-size: 0.875rem;
}

.todo-delete {
    color: var(--text-muted);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
}

.todo-item:hover .todo-delete {
    opacity: 1;
}

.todo-delete:hover {
    color: var(--danger-color);
}

/* Note Widget */
.note-widget {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    min-height: 200px;
}

body.dark-mode .note-widget {
    background: linear-gradient(135deg, #451a03 0%, #78350f 100%);
}

.note-widget textarea {
    width: 100%;
    min-height: 150px;
    background: transparent;
    border: none;
    resize: none;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--text-primary);
}

.note-widget textarea:focus {
    outline: none;
}

.note-widget textarea::placeholder {
    color: var(--text-muted);
}

/* Calculator Widget */
.calc-widget {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.calc-display {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    text-align: right;
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border-light);
}

.calc-btn {
    background: var(--surface-color);
    border: none;
    padding: var(--space-lg);
    font-size: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.calc-btn:hover {
    background: var(--bg-secondary);
}

.calc-btn.operator {
    background: var(--primary-gradient);
    color: white;
}

.calc-btn.operator:hover {
    opacity: 0.9;
}

.calc-btn.equals {
    background: var(--primary-gradient);
    color: white;
    grid-column: span 2;
}

/* =============================================
   SECTIONS
   ============================================= */
.section-header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

/* Hero Section */
.hero-section {
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    color: white;
    margin-bottom: var(--space-2xl);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--space-md);
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--space-xl);
    max-width: 600px;
    position: relative;
    z-index: 1;
}

/* =============================================
   QUICK LINKS & SEARCH
   ============================================= */
.quick-link-bar {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

.quick-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--surface-color);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.quick-link:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    text-decoration: none;
}

.quick-link i {
    font-size: 1rem;
}

.search-box {
    position: relative;
    margin-bottom: var(--space-xl);
}

.search-box input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    padding-left: 3rem;
    font-size: 1rem;
    background: var(--surface-color);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}

.search-box i {
    position: absolute;
    left: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.25rem;
}

/* =============================================
   STATS & DASHBOARD
   ============================================= */
.stat-card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-icon.primary { background: rgba(102, 126, 234, 0.1); color: var(--primary-color); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--success-color); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning-color); }
.stat-icon.info { background: rgba(59, 130, 246, 0.1); color: var(--info-color); }

.stat-content h4 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0;
}

.stat-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* =============================================
   FOOTER
   ============================================= */
.main-footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-light);
    padding: var(--space-2xl) 0;
    margin-top: var(--space-2xl);
}

.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--space-xs) 0;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-light);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* =============================================
   UTILITIES
   ============================================= */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-md); }

@media (max-width: 1200px) {
    .grid-6 { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 991px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-6 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 576px) {
    .grid-2,
    .grid-3,
    .grid-4 { grid-template-columns: 1fr; }
    .grid-6 { grid-template-columns: repeat(2, 1fr); }
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.text-center { text-align: center; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-fadeIn {
    animation: fadeIn 0.5s ease forwards;
}

.animate-slideIn {
    animation: slideIn 0.3s ease forwards;
}

.animate-pulse {
    animation: pulse 2s ease infinite;
}

/* Staggered animation delays */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* =============================================
   DARK MODE OVERRIDES
   ============================================= */
body.dark-mode .card-modern,
body.dark-mode .tool-card,
body.dark-mode .todo-container,
body.dark-mode .widget-pomodoro,
body.dark-mode .calc-widget {
    background: var(--surface-color);
    border-color: var(--border-light);
}

body.dark-mode .hero-section::before {
    background: rgba(255,255,255,0.05);
}

/* Bootstrap Compatibility */
body.dark-mode .bg-white {
    background-color: var(--surface-color) !important;
}

body.dark-mode .text-dark {
    color: var(--text-primary) !important;
}

body.dark-mode .border {
    border-color: var(--border-light) !important;
}

/* =============================================
   PRINT STYLES
   ============================================= */
@media print {
    .main-header,
    .mobile-header,
    .mobile-nav,
    .main-footer {
        display: none !important;
    }
    
    body {
        padding: 0;
        background: white;
    }
    
    .card-modern,
    .tool-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}