/* Variabili di base (Tema Chiaro) */
:root {
    --bg-color: #F2F2F7;
    --card-bg: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #8E8E93;
    --accent-color: #007AFF;
    --border-color: #E5E5EA;
}

/* Tema Scuro (Dark Mode) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #000000;
        --card-bg: #1C1C1E;
        --text-primary: #FFFFFF;
        --text-secondary: #EBEBF5;
        --accent-color: #0A84FF;
        --border-color: #38383A;
    }
}

/* Reset e Base */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Layout Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    margin-left: 20px;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent-color); }

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 80px 0;
    gap: 40px;
}
.hero-text { flex: 1; }
.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: 20px;
}
.hero-title span { color: var(--accent-color); }
.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}
.download-btn {
    display: inline-block;
    background-color: var(--text-primary);
    color: var(--bg-color);
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, opacity 0.2s;
}
.download-btn:hover { transform: scale(1.05); opacity: 0.9; }

/* Phone Mockup Placeholder */
.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}
.phone-mockup {
    width: 260px;
    height: 540px;
    background-color: var(--card-bg);
    border-radius: 40px;
    border: 10px solid var(--text-primary);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
/* Testo dentro il finto telefono (sostituire con un tag <img>) */
.phone-mockup-text {
    color: var(--text-secondary);
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
}

/* Features Section */
.features { padding: 60px 0; }
.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.feature-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: transform 0.2s;
}
.feature-card:hover { transform: translateY(-5px); }
.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}
.feature-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.feature-desc { color: var(--text-secondary); }

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    margin-top: 40px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
footer a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 10px;
}
footer a:hover { color: var(--accent-color); text-decoration: underline; }

/* Responsive Design per Mobile */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 40px 0;
    }
    .hero-title { font-size: 2.5rem; }
    .hero-text { padding-right: 0; margin-bottom: 40px; }
    .phone-mockup { width: 220px; height: 460px; }
}