:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: radial-gradient(circle at top center, #1a2a3a 0%, #0f1214 80%);
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-secondary: #6c757d;
    --text-muted: #e0e0e0;

    --card-bg: rgba(20, 25, 30, 0.8);
    --card-border: rgba(0, 210, 255, 0.3);
    --card-shadow: 0 0 20px rgba(0, 0, 0, 0.3);

    --cyan-primary: #00d2ff;
    --cyan-glow: rgba(0, 210, 255, 0.5);
    --cyan-bg-light: rgba(0, 210, 255, 0.1);
    --cyan-bg-result: rgba(0, 210, 255, 0.05);

    --input-bg: rgba(255, 255, 255, 0.05);
    --input-bg-focus: rgba(255, 255, 255, 0.1);
    --input-border: rgba(255, 255, 255, 0.1);
    --input-text: #fff;
    --input-placeholder: rgba(255, 255, 255, 0.4);

    --btn-tech-bg: rgba(0, 210, 255, 0.1);
    --btn-tech-border: #00d2ff;
    --btn-tech-text: #00d2ff;
    --btn-tech-hover-bg: #00d2ff;
    --btn-tech-hover-text: #000;
    --btn-tech-hover-shadow: 0 0 20px rgba(0, 210, 255, 0.4);

    --warning-bg: rgba(255, 193, 7, 0.1);
    --warning-border: #ffc107;
    --warning-text: #ffc107;

    --shadow-color: rgba(0, 0, 0, 0.3);
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: linear-gradient(135deg, #e3f2fd 0%, #f5f5f5 100%);
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-secondary: #495057;
    --text-muted: #495057;

    --card-bg: #ffffff;
    --card-border: rgba(0, 120, 138, 0.3);
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);

    --cyan-primary: #00768a;
    --cyan-glow: rgba(0, 118, 138, 0.3);
    --cyan-bg-light: rgba(0, 118, 138, 0.08);
    --cyan-bg-result: rgba(0, 118, 138, 0.05);

    --input-bg: #f8f9fa;
    --input-bg-focus: #ffffff;
    --input-border: #ced4da;
    --input-text: #212529;
    --input-placeholder: #6c757d;

    --btn-tech-bg: rgba(0, 118, 138, 0.1);
    --btn-tech-border: #00768a;
    --btn-tech-text: #00768a;
    --btn-tech-hover-bg: #00768a;
    --btn-tech-hover-text: #ffffff;
    --btn-tech-hover-shadow: 0 4px 15px rgba(0, 118, 138, 0.3);

    --warning-bg: #fff3cd;
    --warning-border: #ffc107;
    --warning-text: #856404;

    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* --- TEMA GLOBAL --- */
body {
    background: var(--bg-main) !important;
    color: var(--text-main);
}

/* --- CONTENEDORES Y TARJETAS --- */
.main-container {
    max-width: 1600px;
}

.form-container {
    max-width: 800px;
    margin: 0 auto;
}

.tech-card {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

/* --- TÍTULOS --- */
.v2l-title {
    color: var(--text-title);
}

.v2l-subtitle {
    color: var(--text-secondary);
}

/* --- INPUTS PERSONALIZADOS --- */
.content-wrapper .form-control {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    font-weight: 500;
    transition: all 0.3s ease;
}

.content-wrapper .form-control:focus {
    background-color: var(--input-bg-focus);
    border-color: var(--cyan-primary);
    color: var(--input-text);
    box-shadow: 0 0 15px var(--cyan-glow);
}

/* Color del placeholder para asegurar contraste */
.content-wrapper .form-control::placeholder {
    color: var(--input-placeholder);
}

/* Etiquetas */
.content-wrapper .form-label {
    color: var(--cyan-primary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.content-wrapper .text-muted {
    color: var(--text-muted) !important;
}

/* --- BOTONES --- */
.btn-tech {
    background: var(--btn-tech-bg);
    border: 1px solid var(--btn-tech-border);
    color: var(--btn-tech-text);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.btn-tech:hover {
    background: var(--btn-tech-hover-bg);
    color: var(--btn-tech-hover-text);
    box-shadow: var(--btn-tech-hover-shadow);
}

/* --- SECCIÓN RESULTADOS (HUD STYLE) --- */
.resultado-card {
    background: var(--cyan-bg-result);
    border-left: 4px solid var(--cyan-primary);
    border-radius: 0 12px 12px 0;
    padding: 2rem;
    margin-top: 2rem;
    position: relative;
    overflow: hidden;
}

.resultado-titulo {
    color: var(--text-main);
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.resultado-valor {
    font-family: 'Roboto', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-title);
    text-shadow: 0 0 15px var(--cyan-glow);
    line-height: 1;
    margin-bottom: 1rem;
}

.resultado-detalle {
    font-size: 1.1rem;
    color: var(--text-main);
}

.resultado-detalle strong {
    color: var(--cyan-primary);
}

/* Alerta personalizada */
.alert-tech-warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    color: var(--warning-text);
}

/* --- THEME TOGGLE BUTTON --- */
.theme-toggle {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 45px;
    height: 45px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle i {
    font-size: 1.2rem;
    color: var(--cyan-primary);
}

/* Protección del header - NO aplicar estilos globales */
.navbar .container-fluid,
header .container-fluid,
nav .container-fluid {
    max-width: none !important;
    width: 100% !important;
}