:root {
    --color-primario: #cc0000;
    --color-primario-hover: #a30000;
    --color-fondo: #131313;
    --color-superficie: #1a1a1a;
    --color-texto-principal: #cccccc;
    --color-texto-secundario: #888888;
    --color-borde: #333333;
    --color-exito: #2ECC71;
    --color-alerta: #F39C12;
    font-family: 'Inter', sans-serif;
}
body {
    background-color: var(--color-fondo);
    color: var(--color-texto-principal);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
}
.container-app {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    flex-grow: 1;
}
.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
    border: 1px solid transparent;
    text-align: center;
}
.btn:active {
    transform: scale(0.98);
}
.btn-primario {
    background-color: var(--color-primario);
    color: white;
    border-color: var(--color-primario);
    box-shadow: 0 0 15px rgba(204, 0, 0, 0.4);
}
.btn-primario:hover {
    background-color: var(--color-primario-hover);
    box-shadow: 0 0 25px rgba(204, 0, 0, 0.6);
}
.btn-secundario {
    background-color: transparent;
    color: var(--color-texto-principal);
    border: 1px solid var(--color-borde);
}
.btn-secundario:hover {
    background-color: var(--color-superficie);
    border-color: var(--color-texto-principal);
    color: white;
}
.card {
    background-color: var(--color-superficie);
    padding: 25px 30px;
    border-radius: 16px;
    border: 1px solid var(--color-borde);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 20px;
}
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal.active {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background-color: var(--color-superficie);
    padding: 30px;
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--color-borde);
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
    transform: scale(0.95);
    transition: transform 0.3s ease;
}
.modal.active .modal-content {
    transform: scale(1);
}
#appHeader {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-borde);
}
.logo {
    font-size: 2rem;
    font-weight: 900;
    color: var(--color-primario);
    text-shadow: 0 0 10px rgba(204, 0, 0, 0.7);
}
.nav-menu button.btn-nav {
    margin-left: 10px;
    background-color: transparent;
    color: var(--color-texto-secundario);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s ease;
}
.nav-menu button.btn-nav:hover {
    color: var(--color-texto-principal);
    background-color: var(--color-superficie);
}
.nav-menu button.btn-nav.active-nav {
    font-weight: 700;
    color: var(--color-primario);
    background-color: rgba(204, 0, 0, 0.1);
}
#mobileMenu {
    background-color: var(--color-superficie);
    border: 1px solid var(--color-borde);
}
#mobileMenu button.btn-nav {
    display: block;
    width: 100%;
    text-align: left;
    padding: 12px 10px;
    margin-left: 0;
    color: var(--color-texto-secundario);
}
#mobileMenu button.btn-nav:hover {
    color: var(--color-texto-principal);
    background-color: var(--color-fondo);
}
#mobileMenu button.btn-nav.active-nav {
    font-weight: 700;
    color: var(--color-primario);
    background-color: rgba(204, 0, 0, 0.1);
}
.question-container .option-btn {
    display: block;
    width: 100%;
    margin-bottom: 12px;
    padding: 16px;
    text-align: left;
    background-color: var(--color-fondo);
    color: var(--color-texto-principal);
    border: 1px solid var(--color-borde);
    border-radius: 10px;
}
.question-container .option-btn:hover {
    background-color: var(--color-superficie);
    border-color: var(--color-primario);
}
.question-container .option-btn.selected {
    background-color: var(--color-primario);
    color: white;
    border-color: var(--color-primario-hover);
    font-weight: 700;
    box-shadow: 0 0 15px rgba(204, 0, 0, 0.5);
}
.progress-bar-container {
    width: 100%;
    background-color: var(--color-fondo);
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
    border: 1px solid var(--color-borde);
}
.progress-bar {
    width: 0%;
    height: 15px;
    background: linear-gradient(90deg, #a30000, var(--color-primario));
    border-radius: 8px;
    transition: width 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    text-align: center;
    line-height: 15px;
    font-size: 0.75rem;
    color: white;
    font-weight: 600;
}
.notification {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-superficie);
    color: var(--color-texto-principal);
    padding: 16px 28px;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.5);
    z-index: 1001;
    transition: bottom 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    border: 1px solid var(--color-borde);
}
.notification.show {
    bottom: 20px;
}
.notification.error {
    background-color: var(--color-primario);
    color: white;
    border-color: var(--color-primario-hover);
}
.notification.success {
    background-color: var(--color-exito);
    color: white;
    border-color: #27AE60;
}
#homeModulePlaceholder {
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #1a1a1a;
    border: 1px dashed #333;
}
#homeModulePlaceholder img {
    transition: transform 0.3s ease;
}
#homeModulePlaceholder img:hover {
    transform: scale(1.03);
}
.learn-more-section .principle-card {
    background-color: var(--color-fondo);
    border: 1px solid var(--color-borde);
}
.learn-more-section .principle-card h3 {
    color: var(--color-primario);
}
.practice-scenario-card {
    border-color: var(--color-borde);
}
.practice-feedback {
    background-color: var(--color-fondo);
    border: 1px solid var(--color-borde);
}
.practice-options label:hover {
    background-color: #2a2a2a;
}
footer {
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
    color: var(--color-texto-secundario);
    border-top: 1px solid var(--color-borde);
}
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}
#pdfViewer {
    width: 100%;
    height: 600px;
    border: none;
    border-radius: 8px;
}