:root {
    /* DARK MODE */
    --bg: #000000; --surface: #111111; --surface-light: #1c1c1e;
    --primary: #5e5ce6; --text: #ffffff; --text-sec: #8e8e93;
    --border: #2c2c2e; --flag-color: #ff9f0a; 
    --survival-gradient: linear-gradient(135deg, #8E2DE2, #4A00E0);
    --success-text: #32d74b; --success-bg: rgba(50, 215, 75, 0.15);
    --danger-text: #ff453a; --danger-bg: rgba(255, 69, 58, 0.15);
}

body.light-mode {
    --bg: #f5f5f7; --surface: #ffffff; --surface-light: #eaeaec;
    --text: #1d1d1f; --text-sec: #86868b; --border: #d2d2d7;
    --success-text: #15803d; --success-bg: #dcfce7;
    --danger-text: #b91c1c; --danger-bg: #fee2e2;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; width: 100%; overflow-x: hidden; }
body { background-color: var(--bg); color: var(--text); display: flex; justify-content: center; align-items: center; transition: background 0.3s, color 0.3s; }
.app-container { width: 100%; max-width: 600px; padding: 20px 20px; display: flex; flex-direction: column; height: 100%; position: relative; }
.hidden { display: none !important; }

/* HEADER & RANK */
header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; margin-top: 10px; }
.header-left { display: flex; flex-direction: column; gap: 4px; }
.header-controls { display: flex; gap: 10px; align-items: center; }
.logo { font-weight: 800; font-size: 1.4rem; letter-spacing: -0.5px; }
.badge { background: var(--primary); color: white; padding: 3px 7px; border-radius: 6px; font-size: 0.65em; vertical-align: middle; transform: translateY(-2px); display: inline-block; }
.rank-badge { font-size: 0.9rem; color: var(--primary); font-weight: 700; cursor: pointer; display: inline-block; margin-top: 2px;}
.icon-btn { background: none; border: none; font-size: 1.3rem; cursor: pointer; border-radius: 50%; transition: background 0.2s; padding: 6px; }
.icon-btn:active { background: var(--surface-light); }

.shortcut-badge { 
    font-size: 0.8rem; font-weight: 600; background: var(--surface-light); 
    border: 1px solid var(--border); padding: 6px 14px; border-radius: 20px; 
    cursor: pointer; display: flex; align-items: center; gap: 6px; color: var(--text); transition: 0.2s;
    user-select: none;
}
.shortcut-badge:hover { border-color: var(--text-sec); transform: translateY(-1px); }
.key-icon { font-size: 1rem; }

/* NAV BAR */
.nav-bar { display: flex; align-items: center; margin-bottom: 25px; position: relative; }
.btn-back-round { 
    background: var(--surface); border: 1px solid var(--border); color: var(--text); 
    width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; 
    cursor: pointer; transition: 0.2s; box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.btn-back-round:active { transform: scale(0.92); background: var(--surface-light); }
#menu-title, #stats-title, #study-title { position: absolute; left: 50%; transform: translateX(-50%); font-weight: 800; font-size: 1.2rem; letter-spacing: -0.3px; }

/* CHIPS */
.chip-container { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.chip { background: var(--surface-light); border: 1px solid var(--border); color: var(--text-sec); padding: 10px 16px; border-radius: 22px; font-size: 0.95rem; cursor: pointer; font-weight: 600; transition: 0.2s; }
.chip.active { background: var(--primary); color: white; border-color: var(--primary); box-shadow: 0 4px 12px rgba(94, 92, 230, 0.3); transform: translateY(-1px); }

/* CARDS */
.card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-bottom: 20px; }
.card, .action-card { background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 24px; transition: 0.2s; cursor: pointer; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
.card { display: flex; flex-direction: column; align-items: center; text-align: center; }
.card:active, .action-card.hover-effect:active { transform: scale(0.96); background: var(--surface-light); }
.card-icon { font-size: 2.5rem; margin-bottom: 12px; }
.card h3, .action-card h3 { font-size: 1.15rem; margin-bottom: 5px; font-weight: 700; letter-spacing: -0.3px; }
.card p, .action-card p { font-size: 0.9rem; color: var(--text-sec); font-weight: 500; }

/* SURVIVAL */
.survival-card { background: var(--survival-gradient); border: none; color: white; margin-bottom: 20px; padding: 22px 26px; }
.survival-card h3 { color: white; margin-bottom: 4px; }
.survival-card p { color: rgba(255,255,255,0.9); font-size: 0.9rem; }
.survival-badge { background: rgba(0,0,0,0.3); padding: 6px 12px; border-radius: 12px; font-weight: 700; font-size: 0.9rem; white-space: nowrap; margin-left: 10px;}
.survival-over .skull-icon { font-size: 5rem; margin-bottom: 15px; animation: pulse 2s infinite; }
.survival-over h2 { color: #ff453a; font-size: 2.5rem; margin-bottom: 5px; font-weight: 900; }
.final-score-box { background: rgba(255, 255, 255, 0.1); padding: 20px; border-radius: 20px; margin: 25px 0; border: 1px solid rgba(255,255,255,0.2); }
.final-score-box span { display: block; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; font-weight: 600; opacity: 0.8; }
.final-score-box strong { font-size: 3.5rem; color: white; font-weight: 800; }
@keyframes pulse { 0% { transform: scale(1); } 50% { transform: scale(1.1); } 100% { transform: scale(1); } }

/* FOOTER GRID */
.home-footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 10px; margin-top: auto; }
.btn-icon.small { padding: 12px 6px; font-size: 0.75rem; font-weight: 600; flex-direction: column; border-radius: 16px; gap: 6px; background: var(--surface-light); border: 1px solid var(--border); color: var(--text); display: flex; align-items: center; justify-content: center; transition: 0.2s; }
.btn-icon.small:active { transform: scale(0.95); }
.btn-icon.danger { color: var(--danger-text); border-color: rgba(255,69,58,0.3); background: rgba(255,69,58,0.05); }

/* RICERCA */
.search-container { display: flex; gap: 10px; margin-bottom: 20px; }
.search-input { flex: 1; padding: 14px 18px; border-radius: 16px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font-size: 1.05rem; outline: none; transition: 0.2s; font-weight: 500; }
.search-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(94, 92, 230, 0.15); }
.search-btn { background: var(--surface-light); border: 1px solid var(--border); color: var(--text); padding: 0 20px; border-radius: 16px; cursor: pointer; font-size: 1.3rem; transition: 0.2s; }
.search-btn:active { transform: scale(0.95); }

/* MENU */
.menu-content { display: flex; flex-direction: column; gap: 25px; }
.filter-box label { display: block; font-size: 0.9rem; color: var(--text-sec); margin-bottom: 10px; text-transform: uppercase; font-weight: 700; letter-spacing: 0.5px; }
.slider-wrapper { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; }
input[type=range] { flex: 1; accent-color: var(--primary); height: 8px; border-radius: 4px; }
#sim-count-display { font-weight: 800; color: var(--primary); min-width: 35px; font-size: 1.1rem; }

/* BUTTONS */
.btn-primary, .btn-secondary, .btn-outline { width: 100%; padding: 16px; border-radius: 16px; font-weight: 700; font-size: 1.05rem; cursor: pointer; transition: 0.2s; }
.btn-primary:active, .btn-secondary:active, .btn-outline:active { transform: scale(0.98); }
.btn-primary { background: var(--primary); color: white; border: none; box-shadow: 0 4px 15px rgba(94, 92, 230, 0.3); }
.btn-secondary { background: var(--surface-light); color: var(--text); border: 1px solid var(--border); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:disabled { opacity: 0.3; cursor: not-allowed; }
.btn-group { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* QUIZ */
.quiz-top-bar { margin-bottom: 25px; }
.progress-track { height: 8px; background: var(--border); border-radius: 4px; margin-bottom: 10px; overflow: hidden; }
#progress-bar { height: 100%; background: var(--primary); width: 0%; transition: width 0.3s ease; border-radius: 4px; }
.quiz-meta { display: flex; justify-content: space-between; font-size: 0.95rem; color: var(--text-sec); font-weight: 600; }

.question-area { position: relative; margin-bottom: 25px; padding-right: 40px; }
.flag-btn { 
    position: absolute; 
    right: -10px; 
    top: -5px; 
    background: none; 
    border: none; 
    font-size: 1.6rem; 
    cursor: pointer; 
    color: var(--border); 
    transition: color 0.2s; 
    z-index: 10;
}
.flag-btn.active { color: var(--flag-color); }
.tag { display: inline-block; font-size: 0.8rem; color: var(--primary); background: rgba(94, 92, 230, 0.1); padding: 5px 10px; border-radius: 8px; font-weight: 700; margin-bottom: 12px; letter-spacing: 0.5px; }
h2 { font-size: 1.4rem; line-height: 1.45; font-weight: 700; margin-bottom: 15px; letter-spacing: -0.3px; }

/* AUMENTATE DIMENSIONI OPZIONI QUI */
.option-btn { background: var(--surface); padding: 18px; border-radius: 16px; margin-bottom: 12px; border: 1px solid var(--border); cursor: pointer; transition: 0.15s; font-size: 1.1rem; width: 100%; text-align: left; color: var(--text); font-weight: 500; }
.option-btn:active { background: var(--surface-light); transform: scale(0.99); }
.option-btn.disabled { pointer-events: none; }
.option-btn.correct { border-color: var(--success-text); background: var(--success-bg); color: var(--success-text); font-weight: 700; }
.option-btn.wrong { border-color: var(--danger-text); background: var(--danger-bg); color: var(--danger-text); font-weight: 700; }

.feedback { display: none; } /* NASCOSTO FEEDBACK TESTUALE */
.quiz-footer { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 15px; }
.btn-esc { background: transparent; color: var(--text-sec); border: 1px solid var(--border); padding: 12px 20px; border-radius: 14px; font-weight: 600; cursor: pointer; transition: 0.2s; font-size: 1rem; }
.btn-esc:hover { border-color: var(--text); color: var(--text); }

/* RIPASSO & NOTES */
#study-screen { height: 100%; display: flex; flex-direction: column; }
.study-list { flex: 1; overflow-y: auto; padding-bottom: 30px; -webkit-overflow-scrolling: touch; }
.study-item { background: var(--surface); padding: 24px; border-radius: 24px; border: 1px solid var(--border); margin-bottom: 18px; position: relative; }
.study-flag { position: absolute; top: 18px; right: 18px; font-size: 1.5rem; cursor: pointer; color: var(--border); }
.study-flag.active { color: var(--flag-color); }
.study-id { color: var(--primary); font-weight: 800; font-size: 0.85rem; margin-bottom: 10px; display: block; }
.study-q { font-weight: 700; margin-bottom: 18px; line-height: 1.45; font-size: 1.15rem; padding-right: 30px; }
.study-options { display: flex; flex-direction: column; gap: 10px; }
.study-opt-btn { background: var(--surface-light); border: 1px solid var(--border); padding: 14px; border-radius: 12px; text-align: left; color: var(--text-sec); cursor: pointer; font-size: 1rem; font-weight: 500; transition: 0.2s; }
.study-opt-btn.correct { border-color: var(--success-text); background: var(--success-bg); color: var(--success-text); font-weight: 700; }
.study-opt-btn.wrong { border-color: var(--danger-text); background: var(--danger-bg); color: var(--danger-text); font-weight: 700; }
.study-opt-btn.disabled { pointer-events: none; }
.note-area { margin-top: 18px; width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 12px; color: var(--text); padding: 12px; font-size: 1rem; resize: vertical; min-height: 70px; outline: none; font-family: inherit; transition: 0.2s; }
.note-area:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(94, 92, 230, 0.1); }

/* RANK PROGRESS */
.rank-section { margin-top: 15px; margin-bottom: 25px; }
.rank-progress-container { width: 100%; height: 8px; background: var(--surface-light); border-radius: 4px; overflow: hidden; }
.rank-progress-bar { height: 100%; background: var(--primary); width: 0%; transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.rank-subtext { font-size: 0.85rem; color: var(--text-sec); margin-top: 8px; text-align: right; font-weight: 500; }

/* MODALS */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); backdrop-filter: blur(8px); z-index: 1000; display: flex; justify-content: center; align-items: center; padding: 20px; }
.modal-content { background: var(--surface); border: 1px solid var(--border); padding: 35px; border-radius: 32px; width: 100%; max-width: 400px; text-align: center; box-shadow: 0 25px 60px rgba(0,0,0,0.4); max-height: 90vh; overflow-y: auto; }
.modal-content h3 { margin-bottom: 15px; color: var(--primary); font-weight: 800; font-size: 1.5rem; }
.shortcut-list, .rank-list { list-style: none; text-align: left; }
.shortcut-list li, .rank-list li { display: flex; justify-content: space-between; margin-bottom: 14px; font-size: 1rem; color: var(--text-sec); border-bottom: 1px solid var(--border); padding-bottom: 10px; }
.rank-list li.current-rank { color: var(--primary); font-weight: 700; border-color: var(--primary); }
.rank-req { font-family: monospace; font-weight: 700; background: var(--surface-light); padding: 4px 10px; border-radius: 8px; font-size: 0.9rem;}
.key { background: var(--surface-light); border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; font-family: monospace; font-weight: bold; font-size: 0.9rem;}
.mode-buttons { display: flex; flex-direction: column; gap: 12px; margin-top: 30px; }

/* RESULT SCREEN */
.result-card { background: var(--surface); border-radius: 32px; padding: 35px 25px; border: 1px solid var(--border); display: flex; flex-direction: column; align-items: center; margin-bottom: 25px; box-shadow: 0 10px 40px rgba(0,0,0,0.1); }
.circular-progress { position: relative; width: 160px; height: 160px; margin-bottom: 30px; }
.circular-chart { display: block; margin: 0 auto; max-width: 100%; }
.circle-bg { fill: none; stroke: var(--surface-light); stroke-width: 3; }
.circle { fill: none; stroke-width: 3; stroke-linecap: round; stroke: var(--primary); transition: stroke-dasharray 1s ease-out; }
.percentage-label { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 2.5rem; font-weight: 800; color: var(--text); letter-spacing: -1px; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; width: 100%; }
.stat-box { background: var(--surface-light); padding: 18px; border-radius: 16px; text-align: center; display: flex; flex-direction: column; }
.stat-label { font-size: 0.8rem; color: var(--text-sec); margin-bottom: 6px; text-transform: uppercase; font-weight: 700; letter-spacing: 0.5px; }
.stat-value { font-size: 1.4rem; font-weight: 800; color: var(--text); }
.result-buttons { display: flex; flex-direction: column; gap: 12px; margin-top: auto; width: 100%; }

#stats-screen { height: 100%; display: flex; flex-direction: column; }
.stats-content { flex: 1; overflow-y: auto; padding-bottom: 30px; display: flex; flex-direction: column; gap: 20px; }
.chart-card { background: var(--surface); padding: 25px; border-radius: 24px; border: 1px solid var(--border); box-shadow: 0 4px 10px rgba(0,0,0,0.02); }

.owner-credit { font-size: 0.85rem; color: var(--text-sec); margin-top: 25px; padding-top: 15px; border-top: 1px solid var(--border); font-weight: 500; letter-spacing: 0.5px; opacity: 0.7; }

/* MOBILE OPTIMIZATION SPECIFICA */
@media (max-width: 768px) {
    .app-container { padding: 15px; max-width: 100%; }
    h2 { font-size: 1.3rem; line-height: 1.4; margin-bottom: 20px; } /* Testo domanda più grande su mobile */
    .option-btn { padding: 16px; font-size: 1.05rem; margin-bottom: 10px; } /* Risposte più grandi e visibili */
    .btn-primary, .btn-secondary, .btn-outline { padding: 14px; font-size: 1rem; }
    .quiz-top-bar { margin-bottom: 20px; }
    .card-grid { gap: 12px; }
    .card, .action-card { padding: 20px; }
    .nav-bar { margin-bottom: 20px; }
    #options-container { display: flex; flex-direction: column; gap: 0; }
    .quiz-footer { padding-top: 10px; }
    .question-area { margin-bottom: 20px; padding-right: 35px; }
    .flag-btn { right: -5px; top: -5px; font-size: 1.6rem; } /* Flag ben visibile */
}

@media (hover: none) { .desktop-only { display: none !important; } }