:root {
    --color-red: #ef4444;
    --color-red-light: #fee2e2;
    --color-red-dark: #b91c1c;

    --color-green: #22c55e;
    --color-green-light: #dcfce7;
    --color-green-dark: #15803d;

    --color-blue: #3b82f6;
    --color-blue-light: #dbeafe;
    --color-blue-dark: #1d4ed8;

    --color-yellow: #ffc300;
    --color-yellow-light: #ffe9a7;
    --color-yellow-dark: #b28200;

    --color-orange: #f97316;
    --color-orange-light: #ffedd5;
    --color-orange-dark: #c2410c;

    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-600: #4b5563;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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



body {
    font-family: var(--font-sans);
    background-color: var(--color-gray-50);
    color: var(--color-gray-800);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

#app {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Navigation */
.navbar {
    background-color: var(--color-gray-900);
    color: white;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}

.navbar-links {
    display: flex;
    gap: 2rem;
}

.navbar-links a {
    color: var(--color-gray-200);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.navbar-links a:hover {
    color: white;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--color-gray-200);
}

/* Ensure code-tabs inside cards have breathing room */
.card .code-tabs {
    margin-top: 1rem;
    margin-bottom: .5rem;
}

/* Spacing between stacked cards inside a card */
.card .card {
    margin-top: 1rem;
    margin-bottom: 0;
}

.card-header {
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-gray-200);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

/* Color-coded cards */
.card-vulnerability {
    border-left: 4px solid var(--color-red);
    background-color: var(--color-red-light);
}

.card-vulnerability .card-title {
    color: var(--color-red-dark);
}

.card-secure {
    border-left: 4px solid var(--color-green);
    background-color: var(--color-green-light);
}

.card-secure .card-title {
    color: var(--color-green-dark);
}

.card-explanation {
    border-left: 4px solid var(--color-blue);
    background-color: var(--color-blue-light);
}

.card-explanation .card-title {
    color: var(--color-blue-dark);
}

.card-warning {
    border-left: 4px solid var(--color-orange);
    background-color: var(--color-orange-light);
}

.card-warning .card-title {
    color: var(--color-orange-dark);
}

/* Code blocks */
.code-block {
    background-color: var(--color-gray-900);
    color: #e5e7eb;
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    margin: 1rem 0;
}

.code-block .keyword {
    color: #c678dd;
}

.code-block .string {
    color: #98c379;
}

.code-block .comment {
    color: #5c6370;
    font-style: italic;
}

.code-block .function {
    color: #61afef;
}

.code-block .variable {
    color: #e06c75;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-size: 0.875rem;
}

.btn-primary {
    background-color: var(--color-blue);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-blue-dark);
}

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

.btn-danger:hover {
    background-color: var(--color-red-dark);
}

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

.btn-success:hover {
    background-color: var(--color-green-dark);
}

.btn-warning {
    background-color: var(--color-orange);
    color: white;
}

.btn-warning:hover {
    background-color: var(--color-orange-dark);
}

/* Input fields */
.input-group {
    margin: 1rem 0;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-gray-600);
}

.input-field {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.input-field:focus {
    outline: none;
    border-color: var(--color-blue);
}

/* Step visualization */
.step-visualization {
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.step {
    display: flex;
    justify-content: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.step:last-child {
    border-bottom: none;
}

/* Inner wrapper keeps icon+text left-aligned inside a centered block */
.step-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 480px;
}

.step-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    text-align: left;
}

.step-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.step-description {
    color: var(--color-gray-600);
    font-size: 0.875rem;
}

/* Result display */
.result-display {
    background-color: var(--color-gray-900);
    color: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.result-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-content {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.result-success {
    color: var(--color-green);
}

.result-error {
    color: var(--color-red);
}

.result-warning {
    color: var(--color-orange);
}

/* Diagrams */
.diagram-container {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin: 2rem 0;
    border: 2px solid var(--color-gray-200);
}

/* Sections */
.section {
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-gray-900);
}

.section-subtitle {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-gray-800);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-red {
    background-color: var(--color-red-light);
    color: var(--color-red-dark);
}

.badge-green {
    background-color: var(--color-green-light);
    color: var(--color-green-dark);
}

.badge-blue {
    background-color: var(--color-blue-light);
    color: var(--color-blue-dark);
}

.badge-yellow {
    background-color: var(--color-yellow-light);
    color: var(--color-yellow-dark);
}

.badge-orange {
    background-color: var(--color-orange-light);
    color: var(--color-orange-dark);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .navbar-links {
        gap: 1rem;
    }

    .navbar-links a {
        font-size: 0.875rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

.note {
    background-color: #f0f4f8; /* chiaro, non distrae */
    border-left: 4px solid #007acc; /* evidenzia la nota */
    padding: 12px 16px;
    margin: 16px 0;
    font-size: 0.95rem;
    color: #333;
    border-radius: 4px;
}