/**
 * Bookabel - Modern Design System
 * Design innovativo con variabili CSS, gradients e animazioni
 */

/* ================ VARIABILI CSS ================ */
:root {
    /* Colori principali - Palette personalizzata */
    --primary: #24C6E2;
    --primary-dark: #145a92;
    --primary-light: #72d1e8;
    --secondary: #00357A;
    --secondary-dark: #145a92;
    
    /* Colori accent dalla palette */
    --accent-coral: #ff8763;
    --accent-peach: #ffb58a;
    --accent-light-blue: #dff7ff;
    --accent-soft-blue: #b8f2ff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #24C6E2 0%, #72d1e8 100%);
    --gradient-success: linear-gradient(135deg, #24C6E2 0%, #72d1e8 100%);
    --gradient-warning: linear-gradient(135deg, #ff8763 0%, #ffb58a 100%);
    --gradient-danger: linear-gradient(135deg, #ff8763 0%, #ff8763 100%);
    --gradient-info: linear-gradient(135deg, #145a92 0%, #00357A 100%);
    
    /* Colori neutri - Palette personalizzata */
    --gray-50: #f4f7fa;
    --gray-100: #e7eef5;
    --gray-200: #e7eef5;
    --gray-300: #c9d1d9;
    --gray-400: #c9d1d9;
    --gray-500: #5a6f85;
    --gray-600: #58616b;
    --gray-700: #58616b;
    --gray-800: #1f1f1f;
    --gray-900: #1f1f1f;
    
    /* Background colors dalla palette */
    --bg-white: #ffffff;
    --bg-light: #f4f7fa;
    --bg-soft: #e7eef5;
    --bg-accent-light: #dff7ff;
    --bg-accent-soft: #b8f2ff;
    
    /* Status colors - Palette personalizzata */
    --success: #24C6E2;
    --warning: #ff8763;
    --danger: #ff8763;
    --info: #145a92;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --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);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--bg-light);
    overflow-x: hidden;
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
    image-rendering: -webkit-optimize-contrast; /* Chrome/Safari */
    image-rendering: crisp-edges; /* Firefox */
    image-rendering: high-quality; /* Standard */
    -ms-interpolation-mode: bicubic; /* IE */
    object-fit: contain; /* Mantiene le proporzioni */
}

/* Logo specifico - migliora la qualità quando scalato */
.navbar-brand img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: high-quality;
    -ms-interpolation-mode: bicubic;
    object-fit: contain;
    width: auto;
    height: 40px;
    max-width: 200px;
}

/* Hero section - migliora la qualità delle immagini di sfondo */
.hero {
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

/* ================ TYPOGRAPHY ================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--gray-900);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--gray-600);
}

/* ================ CONTAINER & LAYOUT ================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--space-lg);
}

/* ================ BUTTONS ================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--secondary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: white;
    color: var(--secondary);
    border: 2px solid var(--secondary);
}

.btn-secondary:hover {
    background: var(--secondary);
    color: white;
}

.btn-success {
    background: var(--gradient-success);
    color: white;
}

.btn-danger {
    background: var(--gradient-danger);
    color: white;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

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

/* ================ FORMS ================ */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--gray-700);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(36, 198, 226, 0.1);
}

.form-control.error {
    border-color: var(--danger);
}

.form-error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: var(--space-xs);
}

select.form-control {
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2358616b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* ================ PASSWORD FIELD WITH TOGGLE ================ */
.password-wrapper {
    position: relative;
}

.password-wrapper .form-control {
    padding-right: 3rem;
}

.password-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1rem;
    transition: var(--transition);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
}

.password-toggle:hover {
    color: var(--primary);
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-sm);
}

.password-toggle:hover {
    color: var(--primary);
}

.password-toggle:focus {
    outline: none;
    color: var(--primary);
}

/* ================ PASSWORD REQUIREMENTS ================ */
.password-requirements {
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: var(--bg-light);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.password-requirements-title {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-xs);
    font-size: 0.875rem;
}

.password-requirement {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
    color: var(--gray-600);
    transition: var(--transition);
}

.password-requirement:last-child {
    margin-bottom: 0;
}

.password-requirement.valid {
    color: var(--success);
}

.password-requirement.valid .requirement-icon::before {
    content: '\f00c';
    color: var(--success);
}

.password-requirement.invalid .requirement-icon::before {
    content: '\f00d';
    color: var(--gray-400);
}

.requirement-icon {
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    width: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.requirement-icon::before {
    content: '\f00d';
    color: var(--gray-400);
}

/* ================ CARDS ================ */
.card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
}

/* Maggiore respiro per le card senza sezioni strutturate */
.card:not(:has(.card-body)) {
    padding: var(--space-lg);
}
.card:not(:has(.card-body)) > *:first-child {
    margin-top: 0;
}
.card:not(:has(.card-body)) > *:last-child {
    margin-bottom: 0;
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.card-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
}

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

.card-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--gray-200);
    background: var(--bg-light);
}

/* ================ NAVIGATION ================ */
.navbar {
    background: white;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-menu {
    display: flex;
    gap: var(--space-md);
    list-style: none;
    align-items: center;
    margin: 0;
    padding: 0;
}

.navbar-link {
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.navbar-link:hover {
    background: var(--gray-100);
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
}

.navbar-toggle:hover {
    color: var(--primary);
}

.navbar-menu li {
    display: flex;
    align-items: center;
}

/* ================ HERO SECTION ================ */
.hero {
    position: relative;
    background: var(--gradient-primary);
    color: white;
    padding: 5rem 0;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,%3Csvg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"%3E%3Cg fill="none" fill-rule="evenodd"%3E%3Cg fill="%23ffffff" fill-opacity="0.1"%3E%3Cpath d="M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z"/%3E%3C/g%3E%3C/g%3E%3C/svg%3E');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    color: white;
    font-size: 3.5rem;
    margin-bottom: var(--space-lg);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: var(--space-2xl);
}

/* ================ GRID ================ */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* ================ BADGES ================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary { background: var(--bg-accent-light); color: var(--primary); }
.badge-success { background: var(--bg-accent-light); color: var(--success); }
.badge-warning { background: rgba(255, 135, 99, 0.15); color: var(--warning); }
.badge-danger { background: rgba(255, 135, 99, 0.15); color: var(--danger); }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }

/* ================ ALERTS ================ */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.alert-success {
    background: var(--bg-accent-light);
    color: var(--success);
    border-left: 4px solid var(--success);
}

.alert-error {
    background: rgba(255, 135, 99, 0.15);
    color: var(--danger);
    border-left: 4px solid var(--danger);
}

.alert-warning {
    background: rgba(255, 181, 138, 0.2);
    color: var(--warning);
    border-left: 4px solid var(--warning);
}

.alert-info {
    background: rgba(20, 90, 146, 0.1);
    color: var(--info);
    border-left: 4px solid var(--info);
}

/* ================ UTILITIES ================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.p-1 { padding: var(--space-sm); }
.p-2 { padding: var(--space-md); }
.p-3 { padding: var(--space-lg); }
.p-4 { padding: var(--space-xl); }

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-sm); }
.gap-2 { gap: var(--space-md); }
.gap-3 { gap: var(--space-lg); }

/* ================ ANIMATIONS ================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

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

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in {
    animation: slideIn 0.4s ease-out;
}

/* ================ RESPONSIVE ================ */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .hero h1 { font-size: 2.5rem; }
    
    .navbar-toggle {
        display: block;
    }
    
    .navbar {
        position: relative !important;
    }
    
    .navbar-menu {
        flex-direction: column;
        position: absolute !important;
        top: 100% !important;
        left: 0 !important;
        right: 0 !important;
        background: white !important;
        box-shadow: var(--shadow-lg) !important;
        padding: var(--space-lg) !important;
        display: none !important;
        gap: var(--space-sm);
        margin: 0 !important;
        border-top: 1px solid var(--gray-200) !important;
        z-index: 999 !important;
    }
    
    .navbar-menu.active {
        display: flex !important;
    }
    
    .navbar-menu li {
        width: 100%;
    }
    
    .navbar-menu li .btn {
        width: 100%;
        justify-content: center;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ================ LOADING SPINNER ================ */
.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ================ TABLE ================ */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead {
    background: var(--bg-light);
}

.table th {
    padding: var(--space-md);
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
}

.table td {
    padding: var(--space-md);
    border-top: 1px solid var(--gray-200);
}

.table tbody tr:hover {
    background: var(--bg-light);
}

/* ================ MODAL ================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

.modal {
    background: white;
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: fadeIn 0.3s;
}

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.modal-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
}