/* ===== GLOBAL STYLES ===== */
body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(120deg, #f4f4f4, #e8e8ff);
    color: #333;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    transition: background 0.6s, color 0.6s;
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

h2 {
    text-align: center;
    margin: 20px 0;
    color: #2c3e50;
    transition: color 0.4s;
}

/* ===== QUIZ CONTAINER ===== */
#quiz-container {
    max-width: 800px;
    margin: 20px auto;
    background: #fff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    transition: background 0.4s, color 0.4s, box-shadow 0.4s;
}

/* ===== LABELS & SELECT ===== */
label {
    font-weight: bold;
    display: block;
    margin-bottom: 10px;
    margin-top: 20px;
    color: #34495e;
    transition: color 0.4s;
}

select {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: #ecf0f1;
    font-size: 16px;
    transition: background 0.4s, color 0.4s, border 0.4s, box-shadow 0.3s;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
}

/* ===== QUESTIONS & ANSWERS ===== */
p {
    margin: 10px 0;
    font-size: 16px;
    transition: color 0.4s;
}

strong {
    color: #2c3e50;
    transition: color 0.4s;
}

ul {
    padding: 0;
    list-style: none;
}

li {
    margin: 12px 0;
    display: flex;
    align-items: center;
}

.option-letter {
    font-weight: bold;
    margin-right: 10px;
}

/* ===== BUTTONS WITH GLOW ===== */
li button {
    flex-grow: 1;
    background: linear-gradient(145deg, #6a8aff, #4a6fff);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 0 12px rgba(74,111,255,0.6), 0 4px 12px rgba(0,0,0,0.15);
}

li button:hover {
    background: linear-gradient(145deg, #4a6fff, #6a8aff);
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(74,111,255,0.8), 0 6px 15px rgba(0,0,0,0.2);
}

.correcta {
    background-color: transparent;
    padding: 10px;
    border-radius: 6px;
    color: #00ff85;
}

.incorrecta {
    background-color: transparent;
    padding: 10px;
    border-radius: 6px;
    color: #ff4c4c;
}

.solution-button {
    width: 100%;
    background: linear-gradient(145deg, #ff8c42, #e67e22);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
    margin-top: 20px;
    box-shadow: 0 0 12px rgba(255,126,34,0.6), 0 4px 12px rgba(0,0,0,0.15);
}

.solution-button:hover {
    background: linear-gradient(145deg, #e67e22, #ff8c42);
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(255,126,34,0.8), 0 6px 15px rgba(0,0,0,0.2);
}

.ocult { display: none; }
.visible { display: block; }

/* ===== DARK MODE CINEMÀTIC ===== */
body.dark-mode {
    background: linear-gradient(120deg, #0f0f1e, #1a1a3f);
    color: #e0e0ff;
    background-size: 400% 400%;
    animation: gradientShiftDark 20s ease infinite;
}

@keyframes gradientShiftDark {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

body.dark-mode h2 { color: #f0f0ff; }
body.dark-mode #quiz-container { 
    background: #1f1f3a; 
    color: #e0e0ff; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.6); 
}
body.dark-mode label { color: #c8c8ff; }
body.dark-mode select { 
    background-color: #2b2b4a; 
    color: #e0e0ff; 
    border: 1px solid #6666aa; 
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.3);
}

body.dark-mode li button {
    background: linear-gradient(145deg, #7a6aff, #4d4fff);
    color: #f0f0ff;
    box-shadow: 0 0 12px rgba(77,79,255,0.7), 0 4px 12px rgba(0,0,0,0.4);
}

body.dark-mode li button:hover {
    background: linear-gradient(145deg, #4d4fff, #7a6aff);
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(77,79,255,0.9), 0 6px 15px rgba(0,0,0,0.5);
}

body.dark-mode .solution-button {
    background: linear-gradient(145deg, #ffa35c, #ff7a00);
    box-shadow: 0 0 12px rgba(255,123,0,0.7), 0 4px 12px rgba(0,0,0,0.4);
}

body.dark-mode .solution-button:hover {
    background: linear-gradient(145deg, #ff7a00, #ffa35c);
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(255,123,0,0.9), 0 6px 15px rgba(0,0,0,0.5);
}

/* ===== DARK MODE TOGGLE ===== */
.dark-toggle {
    display: block;
    margin: 0 auto 20px auto;
    padding: 12px 18px;
    font-size: 16px;
    background-color: #34495e;
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dark-toggle:hover { background-color: #2c3e50; }

body.dark-mode .dark-toggle {
    background: linear-gradient(145deg, #5555aa, #3b3b7f);
    color: #f0f0ff;
}

body.dark-mode .dark-toggle:hover {
    background: linear-gradient(145deg, #3b3b7f, #5555aa);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    #quiz-container { padding: 18px; }
    li button, .solution-button { font-size: 14px; padding: 12px; }
    select { font-size: 14px; padding: 10px; }
}

@media (max-width: 480px) {
    h2 { font-size: 22px; }
    li button, .solution-button { font-size: 12px; padding: 10px; }
    select { font-size: 12px; padding: 8px; }
    #quiz-container { padding: 14px; }
}