:root {
    /* Tema Claro Predeterminado Premium (Light Theme) */
    --bg-deep: #f8fafc;
    --bg-radial-1: rgba(168, 85, 247, 0.07);
    --bg-radial-2: rgba(59, 130, 246, 0.07);

    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-glass-border: rgba(15, 23, 42, 0.08);
    --bg-glass-border-hover: rgba(134, 0, 167, 0.25);

    --neon-purple: #8600a7;
    --neon-blue: #2563eb;
    --neon-pink: #db2777;
    --neon-green: #10b981;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --nav-bg: rgba(248, 250, 252, 0.85);
    --nav-text: #0f172a;
    --footer-bg: #f1f5f9;

    --input-bg: rgba(255, 255, 255, 0.85);
    --input-border: rgba(15, 23, 42, 0.12);

    --btn-purple: #8600a7;
    --btn-purple-hover: #6d0088;
}

[data-theme="dark"] {
    /* Tema Oscuro Premium (Dark Theme) */
    --bg-deep: #0a0b10;
    --bg-radial-1: rgba(168, 85, 247, 0.15);
    --bg-radial-2: rgba(59, 130, 246, 0.12);

    --bg-card: rgba(18, 20, 32, 0.55);
    --bg-glass-border: rgba(255, 255, 255, 0.08);
    --bg-glass-border-hover: rgba(134, 0, 167, 0.4);

    --neon-purple: #a855f7;
    --neon-blue: #3b82f6;
    --neon-pink: #ec4899;
    --neon-green: #10b981;

    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --nav-bg: rgba(10, 11, 16, 0.85);
    --nav-text: #ffffff;
    --footer-bg: rgba(8, 9, 13, 0.95);

    --input-bg: rgba(255, 255, 255, 0.04);
    --input-border: rgba(255, 255, 255, 0.1);

    --btn-purple: #8600a7;
    --btn-purple-hover: #a855f7;
}

body {
    font-family: "Roboto", sans-serif;
    background-color: var(--bg-deep);
    /* Luces radiales de fondo */
    background-image:
        radial-gradient(circle at 10% 20%, var(--bg-radial-1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, var(--bg-radial-2) 0%, transparent 45%),
        radial-gradient(circle at 50% 50%, var(--bg-deep) 0%, var(--bg-deep) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Navbar estilo premium translucido */
.navbar {
    background-color: var(--nav-bg) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--bg-glass-border);
    padding: 15px 0;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 0.5px;
    font-size: 1.35rem;
    color: var(--nav-text) !important;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.3s ease, color 0.4s ease;
}

.navbar-brand:hover {
    transform: translateY(-1px);
}

.navbar-brand img {
    filter: drop-shadow(0 0 8px rgba(134, 0, 167, 0.3));
}

/* Contenedor principal de la formula */
.formula-section-container {
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid var(--bg-glass-border);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    margin-top: 40px;
    margin-bottom: 30px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.05);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

[data-theme="dark"] .formula-section-container {
    background: rgba(255, 255, 255, 0.02);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.formula-section-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.04) 0%, transparent 60%);
    pointer-events: none;
}

.formula-title {
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary) 40%, var(--neon-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 25px;
    letter-spacing: -0.5px;
}

/* Representación interactiva de la formula */
.formula-interactive {
    font-size: 2.5rem;
    font-weight: 700;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin: 30px 0;
    user-select: none;
}

.formula-symbol {
    color: var(--text-muted);
}

/* Elementos interactivos de la fórmula (badges con hover descriptivo) */
.formula-factor {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--bg-glass-border);
    padding: 8px 20px;
    border-radius: 16px;
    color: var(--text-primary);
    cursor: help;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .formula-factor {
    background: rgba(255, 255, 255, 0.05);
}

.formula-factor:hover {
    background: rgba(168, 85, 247, 0.12);
    border-color: var(--neon-purple);
    color: var(--neon-purple);
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(168, 85, 247, 0.15);
    text-shadow: 0 0 10px rgba(168, 85, 247, 0.3);
}

/* Factor especial FPCT */
.formula-factor.factor-result {
    background: rgba(59, 130, 246, 0.08);
    border-color: rgba(59, 130, 246, 0.25);
    color: var(--neon-blue);
    font-weight: 800;
}

.formula-factor.factor-result:hover {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.25);
    text-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

/* Estilos personalizados para Tooltips de Bootstrap */
.tooltip {
    --bs-tooltip-bg: rgba(15, 17, 26, 0.96) !important;
    --bs-tooltip-color: #ffffff !important;
    --bs-tooltip-border-radius: 14px !important;
    --bs-tooltip-padding-x: 18px !important;
    --bs-tooltip-padding-y: 14px !important;
    --bs-tooltip-opacity: 1 !important;
    transition: opacity 0.25s ease-in-out;
}

.tooltip-inner {
    border: 1px solid rgba(255, 255, 255, 0.12) !important;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    font-size: 0.92rem !important;
    line-height: 1.5 !important;
    max-width: 320px !important;
    text-align: justify !important;
}

/* Tarjetas Glassmorphism de Factores */
.card {
    background: var(--bg-card) !important;
    border: 1px solid var(--bg-glass-border) !important;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px !important;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1) !important;
    overflow: hidden;
    height: 100%;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.03) !important;
}

[data-theme="dark"] .card {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18) !important;
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--bg-glass-border-hover) !important;
    box-shadow: 0 15px 35px rgba(134, 0, 167, 0.12) !important;
}

[data-theme="dark"] .card:hover {
    box-shadow: 0 15px 40px rgba(134, 0, 167, 0.18) !important;
}

.card-body {
    padding: 30px !important;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(15, 23, 42, 0.05);
    padding-bottom: 12px;
    transition: border-color 0.4s ease;
}

[data-theme="dark"] .card-title {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-title::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 22px;
    background: linear-gradient(to bottom, var(--neon-purple), var(--neon-blue));
    border-radius: 3px;
}

/* Inputs de Cristal interactivos */
.form-control {
    background-color: var(--input-bg) !important;
    border: 1px solid var(--input-border) !important;
    color: var(--text-primary) !important;
    border-radius: 12px !important;
    padding: 10px 14px !important;
    transition: all 0.3s ease !important;
}

.form-control:focus {
    background-color: rgba(255, 255, 255, 0.08) !important;
    border-color: var(--neon-purple) !important;
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.2) !important;
    outline: none !important;
}

.form-control::placeholder {
    color: var(--text-muted) !important;
    opacity: 0.6;
}

.col-form-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.4;
}

/* Botones de Cristal y Neón */
.custom-btn-outline {
    background: transparent;
    border: 1px solid var(--neon-purple);
    color: var(--text-primary);
    border-radius: 12px;
    padding: 10px 24px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
}

.custom-btn-outline:hover {
    background: var(--btn-purple);
    color: #ffffff !important;
    border-color: var(--btn-purple);
    box-shadow: 0 6px 15px rgba(134, 0, 167, 0.25);
    transform: translateY(-2px);
}

[data-theme="dark"] .custom-btn-outline:hover {
    box-shadow: 0 8px 20px rgba(134, 0, 167, 0.4);
}

.custom-btn-outline:active {
    transform: translateY(0);
}

/* Panel de Resultados del Cálculo */
.resultado-container {
    text-align: center;
    background: rgba(255, 255, 255, 0.015) !important;
    border: 1px solid rgba(15, 23, 42, 0.05) !important;
    border-radius: 20px;
    padding: 25px;
    margin-top: 15px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
}

[data-theme="dark"] .resultado-container {
    background: rgba(255, 255, 255, 0.02) !important;
    border: 1px solid rgba(255, 255, 255, 0.06) !important;
}

.resultado-titulo {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-weight: 500;
}

#resultadoFecha {
    font-size: 2rem;
    font-weight: 800;
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
    transition: all 0.4s ease;
}

[data-theme="dark"] #resultadoFecha {
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.10);
}

/* Tarjeta especial del plan de acción */
.card-plan-accion {
    position: relative;
    border-color: rgba(59, 130, 246, 0.12) !important;
}

.card-plan-accion:hover {
    border-color: rgba(59, 130, 246, 0.35) !important;
    box-shadow: 0 15px 30px rgba(59, 130, 246, 0.10) !important;
}

[data-theme="dark"] .card-plan-accion:hover {
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.18) !important;
}

.card-plan-accion .card-title::before {
    background: linear-gradient(to bottom, var(--neon-blue), var(--neon-pink));
}

/* Sección de Material de Apoyo (Enlaces y Recursos) */
.col-recursos {
    margin-top: 50px;
}

.recursos-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 35px;
    text-align: center;
    background: linear-gradient(135deg, var(--text-primary) 50%, var(--neon-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.recurso-card-link {
    background: var(--bg-card) !important;
    border: 1px solid var(--bg-glass-border) !important;
    border-radius: 16px !important;
    padding: 20px !important;
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 15px !important;
    text-decoration: none !important;
    color: var(--text-secondary) !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    height: 100%;
}

.recurso-card-link:hover {
    background: var(--bg-card) !important;
    border-color: var(--bg-glass-border-hover) !important;
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(134, 0, 167, 0.08);
}

[data-theme="dark"] .recurso-card-link:hover {
    box-shadow: 0 10px 25px rgba(134, 0, 167, 0.15);
}

.recurso-card-link svg {
    width: 30px;
    height: 30px;
    color: var(--neon-blue);
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.recurso-card-link:hover svg {
    transform: scale(1.1);
    color: var(--neon-purple);
}

.recurso-text-container {
    display: flex;
    flex-direction: column;
}

.recurso-card-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.98rem;
    margin-bottom: 2px;
}

.recurso-card-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* Footer Premium */
.custom-footer {
    background-color: var(--footer-bg) !important;
    border-top: 1px solid var(--bg-glass-border);
    padding: 35px 0;
    margin-top: 50px;
    backdrop-filter: blur(10px);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.custom-footer-text-primary {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
}

.custom-footer-text-primary img {
    filter: drop-shadow(0 0 4px rgba(134, 0, 167, 0.2));
}

.custom-footer-text-secondary {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin: 0;
}

/* Ajustes responsivos */
@media (max-width: 768px) {
    .formula-title {
        font-size: 2.2rem;
    }

    .formula-interactive {
        font-size: 1.8rem;
        gap: 8px;
    }

    .formula-factor {
        padding: 5px 12px;
        border-radius: 12px;
    }

    .formula-section-container {
        padding: 25px 15px;
    }

    .card-body {
        padding: 20px !important;
    }
}

/* Card Resultado Animada y Pintada */
.card-resultado-pintada {
    background: var(--card-bg-gradient) !important;
    border-color: var(--card-border-color) !important;
    box-shadow: var(--card-box-shadow) !important;
    color: #ffffff !important;
    transform: translateY(-5px);
}

.card-resultado-pintada .resultado-titulo {
    color: rgba(255, 255, 255, 0.9) !important;
}

.card-resultado-pintada .resultado-titulo i {
    color: #ffffff !important;
}

.card-resultado-pintada #resultadoFecha {
    color: #ffffff !important;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.6) !important;
}

.card-resultado-pintada .custom-btn-outline {
    border-color: rgba(255, 255, 255, 0.4) !important;
    color: #ffffff !important;
    background: rgba(255, 255, 255, 0.12) !important;
}

.card-resultado-pintada .custom-btn-outline:hover {
    background: #ffffff !important;
    color: var(--card-hover-text-color) !important;
    border-color: #ffffff !important;
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.25) !important;
}

.resultado-titulo i {
    color: var(--neon-blue);
    margin-right: 5px;
}

/* ==========================================================================
   ESTILOS DE AUTENTICACIÓN (LOGIN & REGISTRO)
   ========================================================================== */
.auth-page-wrapper {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 15px;
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-glass-border);
    border-radius: 24px;
    padding: 35px 30px;
    width: 100%;
    max-width: 680px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--bg-radial-1) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.auth-card-inner {
    position: relative;
    z-index: 1;
}

.auth-header {
    text-align: center;
    margin-bottom: 28px;
}

.auth-logo-img {
    width: 70px;
    height: 70px;
    object-fit: contain;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 10px rgba(134, 0, 167, 0.3));
    transition: transform 0.3s ease;
}

.auth-logo-img:hover {
    transform: scale(1.05) rotate(2deg);
}

.auth-title {
    font-size: 1.7rem;
    font-weight: 800;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

/* Tabs de Cambio de Modo (Iniciar Sesión / Registrarse) */
.auth-nav-tabs {
    display: flex;
    background: rgba(125, 125, 125, 0.08);
    padding: 5px;
    border-radius: 14px;
    margin-bottom: 25px;
    border: 1px solid var(--bg-glass-border);
}

.auth-tab-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.auth-tab-btn.active {
    background: var(--btn-purple);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(134, 0, 167, 0.35);
}

.auth-tab-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(125, 125, 125, 0.12);
}

/* Inputs de Formulario Modernos */
.form-group-custom {
    margin-bottom: 18px;
}

.form-label-custom {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-icon-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon-wrapper i.field-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    font-size: 1rem;
    pointer-events: none;
    transition: color 0.2s ease;
}

.input-icon-wrapper .form-control-custom {
    padding-left: 42px;
    padding-right: 42px;
}

.form-control-custom {
    width: 100%;
    padding: 11px 16px;
    background: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.25s ease;
    outline: none;
}

.form-control-custom:focus {
    border-color: var(--neon-purple);
    box-shadow: 0 0 0 4px rgba(134, 0, 167, 0.15);
    background: var(--input-bg);
}

.input-icon-wrapper .toggle-password-btn {
    position: absolute;
    right: 12px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.input-icon-wrapper .toggle-password-btn:hover {
    color: var(--neon-purple);
}

/* Indicador de Fortaleza de Contraseña */
.password-strength-container {
    margin-top: 6px;
}

.password-strength-bar {
    height: 4px;
    background: rgba(125, 125, 125, 0.2);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}

.password-strength-fill {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.password-strength-fill.weak { width: 33%; background: #ef4444; }
.password-strength-fill.medium { width: 66%; background: #f59e0b; }
.password-strength-fill.strong { width: 100%; background: #10b981; }

.password-strength-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Alertas Dinámicas */
.auth-alert {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.9rem;
    margin-bottom: 20px;
    display: none;
    align-items: center;
    gap: 10px;
    animation: fadeIn 0.3s ease;
}

.auth-alert.show {
    display: flex;
}

.auth-alert-danger {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.auth-alert-success {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
}

/* Navbar Badge de Usuario Logeado */
.user-profile-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--bg-glass-border);
    border-radius: 30px;
    color: var(--text-primary);
    font-size: 0.88rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.user-profile-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 0.78rem;
    font-weight: 700;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   ESTILOS DE MENÚ LATERAL (3 RAYITAS / OFFCANVAS)
   ========================================================================== */
.custom-offcanvas {
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.25) !important;
}

.sidebar-menu-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 14px;
    border-radius: 14px;
    background: transparent;
    color: var(--text-primary) !important;
    text-decoration: none;
    transition: all 0.25s ease;
    cursor: pointer;
}

.sidebar-menu-item:hover {
    background: rgba(125, 125, 125, 0.12);
    transform: translateX(4px);
    color: var(--text-primary) !important;
}

.sidebar-icon-box {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.text-primary-custom {
    color: var(--text-primary);
    font-size: 0.95rem;
}