/* Guida TuaGPT - Stili per pubblicazione web */

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-accent: #0ea5e9;
    --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Consolas', 'Monaco', monospace;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow-md);
}

header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
}

header .subtitle {
    margin: 0.5rem 0 0;
    opacity: 0.9;
    font-size: 1.1rem;
}

/* Navigazione */
.main-nav {
    background: white;
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
}

.main-nav a {
    color: var(--color-text);
    text-decoration: none;
    padding: 0.35rem 0.6rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: background 0.2s, color 0.2s;
}

.main-nav a:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary);
}

.main-nav a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.main-nav a.active {
    background: var(--color-primary);
    color: white;
}

/* Main content */
main {
    padding: 2rem 0 4rem;
}

section {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

section:last-of-type {
    border-bottom: none;
}

h2 {
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 1rem;
    padding-top: 0.5rem;
    scroll-margin-top: 80px;
}

h3 {
    font-size: 1.15rem;
    margin: 1.5rem 0 0.5rem;
    color: var(--color-text);
}

p {
    margin: 0.5rem 0 1rem;
}

ul {
    margin: 0.5rem 0 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.35rem;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-bg-alt);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    color: var(--color-primary-dark);
}

/* Footer */
footer {
    background: var(--color-bg-alt);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Torna su (se aggiunto via JS) */
.back-to-top {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background: var(--color-primary);
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    color: white;
}

/* Responsive */
@media (max-width: 600px) {
    .main-nav ul {
        flex-direction: column;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
}