:root {
    --primary: #007bff;
    --success: #28a745;
    --success-active: #1e7e34;
    --bg: #f4f7f6;
    --surface: #ffffff;
    --text: #333333;
    --text-secondary: #666666;
    --border: #e0e0e0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0; padding: 0;
    display: flex; flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--primary); color: white;
    padding: 16px 20px; display: flex;
    justify-content: space-between; align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky; top: 0; z-index: 100;
}

header h1 { margin: 0; font-size: 1.2rem; font-weight: 500; }
.menu-btn {
    background: none; border: none; color: white; cursor: pointer;
    padding: 6px; display: flex; align-items: center; justify-content: center;
}

main { padding: 24px; flex-grow: 1; display: flex; flex-direction: column; align-items: center; }

.app-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 16px 24px 24px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.app-footer p { margin: 0; font-size: 0.8rem; color: var(--text-secondary); }
.app-footer a {
    color: var(--text-secondary);
    text-decoration: underline;
}
.app-footer a:active { color: var(--primary); }

.card {
    background: var(--surface); border-radius: 12px; padding: 20px;
    width: 100%; max-width: 400px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05); margin-bottom: 20px; box-sizing: border-box;
}

h2 { margin-top: 0; font-size: 1.1rem; }
p { color: var(--text-secondary); line-height: 1.5; font-size: 0.95rem; }

.btn {
    background-color: var(--primary); color: white; border: none; padding: 14px 20px;
    border-radius: 8px; font-size: 1rem; font-weight: 500; width: 100%;
    cursor: pointer; margin-top: 10px; transition: background-color 0.2s;
}
.btn:active { background-color: #0056b3; }
.btn:disabled { background-color: #cccccc; cursor: not-allowed; }

/* Banner leggero per l'installazione della PWA */
.install-banner {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background-color: #eaf6ec;
    border: 1px solid #cdeacf;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 16px;
}
.install-banner-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
}
.install-banner-top span {
    color: var(--text);
    font-size: 0.9rem;
    line-height: 1.4;
}
.install-banner-btn {
    background-color: var(--success);
    color: white;
    border: none;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
}
.install-banner-btn:active {
    background-color: var(--success-active);
}
.install-banner-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 2px;
    flex-shrink: 0;
}

/* Bottoni con Icona */
.action-buttons {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    margin-top: 20px;
    width: 100%;
}
.icon-btn {
    background-color: #f1f3f5;
    color: var(--text-secondary);
    border: none;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.1s, background-color 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.icon-btn:active { transform: scale(0.92); background-color: #e2e6ea; }

.primary-icon-btn {
    background-color: var(--primary);
    color: white;
}
.primary-icon-btn:active {
    background-color: #0056b3;
}

.info-item { display: flex; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--border); }
.info-item:last-child { border-bottom: none; }
.info-item input { margin-right: 12px; width: 18px; height: 18px; }

.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5); display: none; justify-content: center; align-items: center; z-index: 1000;
}
.modal { background: var(--surface); padding: 24px; border-radius: 12px; width: 90%; max-width: 350px; max-height: 85vh; overflow-y: auto; box-sizing: border-box; }
.modal h3 { margin-top: 0; }
.close-modal { margin-top: 20px; }

.modal hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.about-author-label {
    margin-bottom: 4px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
}
.about-author-name {
    margin: 0;
    font-weight: 600;
    color: var(--text);
    font-size: 1rem;
}
.about-studio-name {
    margin: 2px 0 12px;
    font-size: 0.9rem;
}
.about-links {
    list-style: none;
    padding: 0;
    margin: 0 0 16px;
}
.about-links li { margin-bottom: 6px; }
.about-links a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.9rem;
    word-break: break-word;
}
.about-links a:active { text-decoration: underline; }
.about-version, .about-copyright {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 4px 0;
}

.hidden { display: none !important; }
.error { color: #d32f2f; margin-top: 15px; }

.manual-steps p { margin-bottom: 14px; }
.manual-steps strong { color: var(--text); }