:root {
    /* Nueva Paleta Orgánica */
    --color-1: #2FA4D7; /* Azul Cielo */
    --color-2: #F5E9D8; /* Crema / Beige */
    --color-3: #E76F2E; /* Naranja */
    --color-4: #3E2C23; /* Marrón Oscuro */

    /* Variables modo Light (Basado en la nueva paleta) */
    --bg: #fcf8f2; /* Crema ultra clarito para evitar el blanco puro */
    --card-bg: var(--color-2);
    --text: var(--color-4);
    --text-muted: #6b5a51;
    --border: #dcc8b8;
    
    --primary: var(--color-1);
    --secondary: var(--color-2);
    --accent: var(--color-3);
    --error: #c92a2a; /* Rojo intenso para reprobado */
    --success: #2d6a4f; /* Verde bosque */
    
    --on-primary: #ffffff;
    --on-secondary: var(--color-4);
    
    --radius: 0.75rem;
    --shadow: 0 4px 12px rgba(62, 44, 35, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Modo Dark (Cálculos basados en la paleta orgánica) */
[data-theme="dark"] {
    /* Fondo basado en una versión ultra oscura del marrón (#3E2C23) */
    --bg: #1a120e; 
    --card-bg: #281d17;
    
    /* Adaptación de colores para oscuridad */
    --primary: #2687b1; /* Azul un poco más profundo */
    --secondary: #3E2C23; 
    --accent: #c65a1f; /* Naranja quemado */
    --error: #fa5252; /* Rojo vibrante para modo dark */
    
    --text: var(--color-2); /* El crema pasa a ser el color de texto */
    --text-muted: #8b7366;
    --border: #4a382e;
    --shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
    
    --on-primary: var(--color-2);
    --on-secondary: var(--color-2);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: var(--transition);
}

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

/* Header */
.header-controls-left {
    display: flex;
    align-items: center;
}

/* Switch de Modo Estudio */
.switch-study {
    position: relative;
    display: inline-flex;
    align-items: center;
    width: 44px;
    height: 24px;
    cursor: pointer;
}

.switch-study input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider-study {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--border);
    transition: .4s;
    border-radius: 34px;
}

.slider-study:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.switch-study input:checked + .slider-study {
    background-color: var(--success);
}

.switch-study input:checked + .slider-study:before {
    transform: translateX(20px);
}

@media (max-width: 768px) {
    .switch-study {
        width: 36px;
        height: 20px;
    }
    .slider-study:before {
        height: 14px;
        width: 14px;
    }
    .switch-study input:checked + .slider-study:before {
        transform: translateX(16px);
    }
}

.main-header {
    background-color: var(--card-bg);
    padding: 1rem 0;
    border-bottom: 4px solid var(--color-1);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 0.75rem;
}

.logo-icon {
    color: var(--color-1);
}

.title-group h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-4);
    letter-spacing: -0.5px;
}

[data-theme="dark"] .title-group h1 {
    color: var(--color-1);
}

.btn-icon {
    margin-left: auto;
    background: var(--bg);
    border: 2px solid var(--color-1);
    color: var(--color-1);
    cursor: pointer;
    padding: 0.7rem 1.4rem; /* Padding calculado para una elipse armoniosa */
    border-radius: 50%; /* Cálculo matemático del óvalo perfecto */
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

.btn-icon:hover {
    transform: rotate(15deg) scale(1.1);
    background-color: var(--color-1);
    color: white;
}

.btn-icon svg {
    display: block;
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1); /* Giro con efecto rebote suave */
}

.btn-icon:hover svg {
    transform: rotate(360deg);
}

.header-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.meta-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.meta-item {
    background-color: rgba(47, 164, 215, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 2rem;
    border: 1px solid var(--color-1);
    color: var(--color-4);
    font-weight: 600;
    font-size: 0.65rem;
}

[data-theme="dark"] .meta-item {
    color: var(--color-2);
    border-color: var(--border);
}

.header-status-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

@media (max-width: 768px) {
    .title-group h1 {
        font-size: 1.1rem !important;
    }

    .meta-item {
        font-size: 0.55rem !important;
        padding: 0.15rem 0.4rem !important;
    }

    .progress-bubble, .timer-container, .status-bubble {
        padding: 0.4rem 0.8rem !important;
        gap: 0.4rem !important;
    }

    /* Tamaño legible para los números */
    #progress-display, 
    #timer-display, 
    .timer-display {
        font-size: 0.85rem !important;
    }

    .btn-icon {
        padding: 0.4rem 0.8rem !important;
    }

    .progress-bubble svg, .timer-container svg, .status-bubble svg, .btn-icon svg {
        width: 14px !important;
        height: 14px !important;
    }

    .header-content {
        gap: 0.6rem !important;
        margin-bottom: 0.5rem !important;
    }

    .header-info-row {
        gap: 0.6rem !important;
        justify-content: space-between !important;
    }

    .header-status-group {
        margin-left: auto !important;
    }

    .choices__inner {
        min-height: 38px !important;
        padding: 0.05rem 0.2rem !important;
    }

    /* Reducir fuentes del combo al mínimo */
    .choice-materia {
        font-size: 0.7rem !important;
    }

    .choice-titulo {
        font-size: 0.65rem !important;
    }

    /* Reducir fuentes de preguntas y respuestas */
    .pregunta-card h3 {
        font-size: 0.9rem !important;
        margin-bottom: 0.7rem !important;
    }

    .opcion-label span {
        font-size: 0.85rem !important;
    }

    .pregunta-card {
        padding: 1rem !important;
    }

    .opcion-label {
        padding: 0.6rem 0.8rem !important;
        gap: 0.8rem !important;
    }
}

/* Efectos de Feedback Negativo */
.shake-effect {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}

.failure-vignette {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, transparent 50%, rgba(201, 42, 42, 0.25) 100%);
    pointer-events: none;
    z-index: 9999;
    animation: vignetteFade 2s ease-out forwards;
}

@keyframes vignetteFade {
    0% { opacity: 0; }
    20% { opacity: 1; }
    100% { opacity: 0; }
}

.status-bubble {
    display: none; /* Oculto por defecto */
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 0.85rem 1.6rem;
    background-color: var(--bg);
    border: 2px solid var(--color-1);
    border-radius: 50%;
    box-shadow: var(--shadow);
    font-weight: 800;
    font-size: 1.15rem;
    white-space: nowrap;
    user-select: none;
    animation: fadeInSlide 0.4s ease-out;
}

.status-bubble:not(.hidden) {
    display: flex; /* Solo se muestra como flex si no tiene .hidden */
}

.status-bubble.aprobado {
    background-color: var(--success);
    border-color: var(--success);
    color: white;
}

.status-bubble.reprobado {
    background-color: var(--error);
    border-color: var(--error);
    color: white;
}

.hidden {
    display: none !important;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateX(10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.progress-bubble {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 0.85rem 1.6rem;
    background-color: var(--bg);
    border: 2px solid var(--color-1);
    border-radius: 50%;
    color: var(--color-1);
    box-shadow: var(--shadow);
    font-weight: 800;
    font-size: 1.15rem;
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.progress-bubble svg {
    color: var(--color-1);
    transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.progress-bubble:not(:disabled):hover {
    transform: rotate(1deg) scale(1.05);
    background-color: var(--color-1);
    color: white;
}

.progress-bubble:not(:disabled):hover svg {
    color: white;
    transform: rotate(360deg);
}

.progress-bubble:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.5);
    transform: none !important;
}

.timer-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 1rem 1.8rem;
    background-color: var(--bg);
    border: 2px solid var(--color-3);
    border-radius: 50%;
    color: var(--color-3);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.timer-container:hover {
    transform: rotate(-1deg) scale(1.05);
    background-color: var(--color-3);
    border-color: var(--color-3);
    color: white;
}

.timer-container:hover .btn-reset {
    transform: rotate(180deg) scale(1.2);
    color: white;
}

.timer-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
    color: inherit; /* Asegura que herede el blanco en hover */
}

.timer-display {
    font-size: 1.25rem;
    font-weight: 800;
    font-family: 'Courier New', monospace;
    line-height: 1;
    color: inherit; /* Asegura que herede el blanco en hover */
}

.btn-reset {
    background: transparent;
    border: none;
    color: inherit; /* Hereda color-3 por defecto, blanco en hover */
    pointer-events: none;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.5s ease;
    margin-left: 0.2rem;
}

.header-selector {
    flex: 1;
    min-width: 0; /* Permite que el flex-item se achique si es necesario */
}

/* Choices.js Custom Styling */
.choices {
    margin-bottom: 0;
    width: 100%;
    max-width: 600px;
}

.choices__inner {
    background-color: var(--bg) !important;
    border: 2px solid var(--color-4) !important;
    border-radius: var(--radius) !important;
    padding: 0.2rem 0.4rem !important;
    min-height: 54px !important;
    display: flex;
    align-items: center;
}

.choices__list--single {
    padding: 0 !important;
    width: 100%;
}

.choices__list--dropdown {
    background-color: var(--bg) !important;
    border: 2px solid var(--color-4) !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--shadow) !important;
}

.choices__list--dropdown .choices__item--selectable.is-highlighted {
    background-color: var(--color-4) !important;
    color: white !important;
}

.choices__list--dropdown .choices__item--selectable.is-highlighted .choice-materia {
    color: rgba(255, 255, 255, 0.8) !important;
}

.choices__list--dropdown .choices__item--selectable.is-highlighted .choice-titulo {
    color: white !important;
}

.choice-content {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

@media (min-width: 768px) {
    .choice-content {
        flex-direction: row;
        align-items: center;
        gap: 1rem;
    }
}

.choice-materia {
    font-size: 1.1rem;
    color: var(--color-1);
    text-transform: uppercase;
    font-weight: 800;
    letter-spacing: 0.05rem;
}

.choice-titulo {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    opacity: 0.85;
    line-height: 1.2;
}

/* Questions */
.pregunta-card {
    background-color: var(--card-bg);
    padding: 1.5rem; /* Reducido de 2rem */
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 1.25rem; /* Reducido de 1.5rem */
}

.pregunta-card h3 {
    margin-bottom: 1rem; /* Reducido de 1.25rem */
    color: var(--color-4);
    font-size: 1.2rem; /* Un poco más chico para ahorrar espacio */
    line-height: 1.3;
}

[data-theme="dark"] .pregunta-card h3 {
    color: var(--color-1);
}

.opcion-label {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 0.8rem 1.25rem; /* Reducido de 1.1rem / 1.5rem */
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 0.6rem; /* Reducido de 0.85rem */
    background-color: var(--bg);
}

.opcion-label:hover {
    border-color: var(--color-1);
    background-color: rgba(47, 164, 215, 0.05);
    transform: translateX(5px);
}

.opcion-label input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    margin: 0;
    margin-top: 0.15rem;
    flex-shrink: 0;
    width: 1.4rem;
    height: 1.4rem;
    border: 2px solid var(--border);
    border-radius: 50%;
    background-color: var(--bg);
    display: grid;
    place-content: center;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.opcion-label input[type="radio"]::before {
    content: "";
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 50%;
    transform: scale(0);
    transition: 0.2s transform cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background-color: var(--color-1);
}

.opcion-label input[type="radio"]:checked {
    border-color: var(--color-1);
    background-color: rgba(47, 164, 215, 0.1);
}

.opcion-label input[type="radio"]:checked::before {
    transform: scale(1);
}

.opcion-label span {
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text);
    font-weight: 500;
}

.opcion-label.correcta {
    background-color: #d8f3dc;
    border-color: var(--success);
    color: #1b4332;
}

[data-theme="dark"] .opcion-label.correcta {
    background-color: rgba(45, 106, 79, 0.2);
    color: #95d5b2;
}

.opcion-label.incorrecta {
    background-color: #fce8e6;
    border-color: var(--color-3);
    color: #78290f;
}

[data-theme="dark"] .opcion-label.incorrecta {
    background-color: rgba(231, 111, 46, 0.15);
    color: #ffb4a2;
}

/* Buttons */
.btn {
    padding: 1rem 2.5rem;
    font-weight: 800;
    border-radius: 3rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--color-1);
    color: white;
    box-shadow: 0 4px 15px rgba(47, 164, 215, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(47, 164, 215, 0.4);
}

.btn-secondary {
    background-color: var(--color-4);
    color: var(--color-2);
}

/* Results */
.resultado-card {
    border: none;
    border-radius: 2rem;
}

.resultado-header {
    background-color: var(--color-4);
    padding: 2.5rem;
}

.score-number {
    color: var(--color-1);
    font-size: 5rem;
    text-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.main-footer {
    padding: 4rem 0;
    text-align: center;
    color: var(--text-muted);
}